Newspapers reported a house sold in my town this week for almost $800,000 over asking, which is to say the buyers bid $2.5M for a house listed at $1.69M. Now the prices are already crazy but this takes the cake. The buyers had lost a few auctions before by not overbidding enough, and wanted to make sure they got this house, even though it is not that remarkable a place.
Our videoconferencing tools have been getting better, but meetings with remote video participants still don't work very well. One problem is poor use of the technology (such as a lack of headsets) which I outlined in my guide to room based video meetings. These can be worked on and the tech keeps improving.
The other big area for improvement is the discipline of the people in the meeting. The big challenge in typical meetings is that some of the participants are 2nd class. This is obvious when you have a meeting room with multiple local people and some remote users. It can also happen when people have differing levels of technology. In an ideal meeting, everybody in the meeting is on the same footing as far as their presence and ability to communicate. In addition, everybody should be as fully engaged with the meeting as if they were in a single olde-tyme meeting room.
We break this rule often. It is quite common to have remote attendees turn off sending video, or mute their audio, for example, making them be more like a TV audience than members of the meeting. It makes sense because it saves bandwidth, and people don't like being watched. We also tolerate having some people present just on the phone, while others are there in person and others are on low and high quality video systems.
If you hope for a good meeting, you also want to express that the main value of the conferencing system is to let people attend without travel. It is not there to let them attend without the same effort and engagement they would put into a meeting they did travel to. The things I describe may seem minor, and they may veto features of great convenience, but those features are actually bugs and disrupt meetings more than people realize.
Here are some principles to get around this:
In an ideal video meeting, everybody is on their own personal video station. There is no meeting room. This means that even if several of the attendees are in the same building, they don't go to a room, they stay at their desks and join the meeting just like any other remote.
This is obviously hard to do if the majority of participants are in the building, but it can be worth it. It also means you don't need room-based videoconferencing systems, which are expensive and don't work well. But if only 2 or 3 of the participants are in the same place, definitely consider having no meeting room. The big benefit is that when everybody has their own microphone, everybody hears everybody really well.
Today you can't have people in the same room using their own computer because they hear the other people both via their headset and through the air. Perhaps some day a smart videoconferencing system will understand that some people are in the same room (you can tell because some sounds do get into the microphones) and adjust. It would allow those who still want a physical meeting room to get the great audio and video that comes from everybody using their own computer and headset. Those in the room together would still be higher-level participants, but remotes would not be that badly off.
We have gotten seduced by how well some voip systems handle speakerphone mode in one on one conversations. Don't be fooled. They don't do group meetings well at all. They seem like they do, but quickly you realize that now everybody hears all the random noises from the location of a speakerphone user. They do things like step away from their desks to eat, chat or take a phone call, and everybody hears it. Keyboards and mice clickety-clack. Sirens go by. It's easy to ignore this in a one on one call, but it disrupts a meeting.
A new organization named Equal Votes is pushing to make a supreme court case to undo the electoral college. They hope to use a precedent set in the famous "Bush v. Gore" 2000 election case, which strengthened the application of the equal protection clause to election law. They want to show that the "Winner takes all" approach that 48 states use to hand out electoral college votes is a violation of the idea of one person one vote. States would then not be able to use it.
It's an interesting idea, but I have grave concerns that it might backfire, and badly. Worst case, it could guarantee a Republican President into the indefinite future. Hopefully not, but that's a bad result, even if you're Republican leaning.
My friend Larry Lessig is supporting this, and I don't doubt the theory that it might win. The idea is that since a state could assign its electors in proportion to how its citizens voted, it is depriving them of their rights by not doing so. If you are in a safe state and not in the dominant party, your vote is useless and effectively counts for nothing.
It is far from certain that this logic can win. Winner takes all is of course the norm in democracies. The country only gets one President even though almost half the country didn't want him. States only get one governor. In California, where state legislators are elected by districts and some Republicans get seats, the reality is that the Democrats get complete power, not partial power. And in the current congress, it takes defections or filibusters to stop complete rule by the Republicans (even though, due to gerrymandering, they got fewer votes than the Democrats in the house.)
And this is where we get the first big risk. Two states, Maine and Nebraska, don't do winner takes all. They follow what seems a very sensible plan at first. A state's electoral college delegation is equal to the number of congressional representatives they have: House members plus two. These states select two electors based on statewide vote, and then select the other electors based on the vote in each district. Just like members of congress, the electors represent their "districts."
There is a risk that if the court held that winner-takes-all is invalid, they might not rule that the established district based system is invalid. Equal Votes will ask for that, but they might not get it. If they don't get it, then some states, in particular the gerrymandered states, may decide to follow the Maine system. And being gerrymandered like this, they are likely to return a slate of electors that is not too different from their congressional delegation -- a heavily skewed delegation. Even if many other states use a different system (like the proportional allocation Equal Votes wants) the result would be a college very much like congress. And that's a GOP college.
Why? Because of operation Redmap. This insidious, I would say evil, cheat on the electoral rules was done by Karl Rove and the RNC in 2010. They poured millions into a carefully selected number of unsafe Democrat statehouse seats around the country, enough to swing those statehouses to the GOP. Then they used that power to redraw the districts in those states in a gerrymandered way to favour the GOP. Not just in the congressional elections, but in future statehouse elections, cementing the power indefinitely. It will need a major anti-GOP swing, or supreme court ruling, to fix it.
The robocar revolution has the potential to assist China in dominating vehicle manufacturing. That's the bad news -- unless you are a Chinese manufacturer. The better news is that manufacturing is only part of the car industry, and it's getting smaller.
Today, Chinese brands are not sold in any numbers in the USA, or almost anywhere outside of China, but China is already the largest car manufacturing country in the world. Chinese brands have no cachet (even in China, it seems) and western and Korean/Japanese brands are strong. How might that change?
Car brand is very important for people buying a car to own. In fact, the nameplate is the top source of value in a modern car sale. The difference is that we will be moving from people buying cars to own towards people buying rides.
When you order "Uber Select" (Uber's nicer-car offering) you don't care if what shows up is a Lexus, BMW or Mercedes. You don't even car if its a Hyundai Genesis, their brand-new attempt at making a luxury marquee. You are only going to ride in it for 15 minutes. It has to be comfortable, smooth and look nice, but rarely does the logo on the outside matter.
It's the Uber brand that matters (though not as much, as most people would find no difference between an UberSelect and a Lyft Premiere as far as the vehicles are concerned. And you might not even care if it's a Great Wall Wey (a Chinese luxury car you've never heard of) that picks you up if it looks nice and gives a reliable ride.
Of course, today the top makers like Mercedes, BMW, Lexus, Audi, Acura, Infiniti and others are known not just for luxury, but for quality. They make well engineered, reliable cars in a way the Chinese are not quite ready to do.
But do they have to? If your expensive BMW breaks down, you have to get it towed, arrange its repair and get a rental car. You're pretty angry at BMW when it does, and you paid a lot for that car to avoid that experience, and usually you do. If a car in a robotaxi fleet breaks down, you're very unlikely to even know it happened. Very rarely, a car like that might break down when you are riding in it. It would pull to the side of the road and have already summoned a replacement car. Within 2-3 minutes a new vehicle will pull up and take you on your way while the company sends a tow truck to deal with the broken car.
Of course, if it broke down while on its way to you, might might not even know it. But even the breakdown while driving will be barely worth mentioning to friends, it just didn't inconvenience you very much at all.
While the BMW will surely break down less than the Great Wall (at least for now) it also costs a great deal more. That might be worth it to avoid that owner's breakdown scenario, but it's not for a fleet breakdown. For a fleet manager, it's just a question of whether vehicle downtime cost is more or less than the extra cost of more robust engineering, with a small factor for customer inconvenience.
To top things off, I predict robocars will have fewer breakdowns. They will always been monitoring themselves, and will come loaded with sensors. They will always get proper maintenance, taking themselves to maintenance depots when it is needed. They will test all systems like brakes, steering, tires, engines and more every day or every hour when running vacant. They will never let anything get too hot or vibrate too much. Both the BMW and the cheap car will do that.
I wrote earlier about tips for hotels and AirBNBs naming things like desk space, amenities, good illumination and more, but let me add some things I would like to see in every unit (and listing) for AirBNB hosts, not all of which apply to hotels.
So many places don't have enough plugs for the modern electronics-laden technomad. So get some power strips. In particular, get the ones that have universal sockets which take US, Euro, UK and Aus/China plugs. Yes, I bring adapters but it's always nice to have some extra plugs. Put one of these power strips by the bed (especially if the plugs by the bed are occupied by lamps and other things.) Put one by the desk space -- you do have desk space, right?
What is the most important feature of your unit? Most of the time it's the view or the location, though also high on the list are its internal quality (fancy and new vs. older and plain,) the living space or the kitchen. But while everybody wants a place with a nice kitchen, living room and bed, few are shopping primarily on that.
Pick the most important feature and make it your main photo. Possibly combine two photos for that main photo. However, if you choose to show the view, make it a realistic photo or include one after. If you show the location by showing a nearby sight, put text in the photo saying "Near to this" or similar.
When I shop for properties, that main photo should grab me. If I'm looking for a view, that's probably what you want to show me. On the other hand, while location is important to me, AirBNB is already showing me that. Having a picture of the famous local landmark is pointless, unless you can see it out your window.
It is important that your photos be realistic. Many are tempted to photograph things to make them look bigger than they are, or to hide something. Don't do it. People will be disappointed and leave you bad reviews, which is worse than an unflattering photo. Yes, your "competitors" are using misleading photos but in the end they will pay for that.
This is particularly true when photographing the view. Don't take a small view only visible if you lean out on the terrace and crop it to make it seem like the view from the property. If your view is only from the terrace, use a wide angle to make it clear you're standing on that. If the view is inside, take some photos inside of the window, showing what you will see walking around the room that has the view. Photos of rooms should not be super wide angle (that makes the room look bigger than it is) but photos of the view often should be.
If you include photos of nearby things, like the town's main tourist site to show that you are near it, mark these photos as "Not from the home, 200m away" or similar.
You should show your "view" even if you have no view. People should know if the unit looks out on a courtyard or back street, and what it looks like. You may be surprised -- even a quiet back street may be exotic to the tourist.
When shooting inside including the windows and view, use a camera with an "HDR" mode (most phones do this now) or get some HDR software so your photo can show the inside and outside at the same time. And seriously, no crappy, blurry photos. I know you're not a professional photographer but today's devices make it easy to get a good shot if you hold reasonably still. You're trying to make serious money -- borrow a friend or their camera if you have to.
Throw in photos of the amenities I describe below, if you have them, to let people know they are there.
If you rent your place for longer-term tenants, consider a photo of a floor plan, if you have one, or sketch one if you can. When renting for more than a week, this is very handy.
Many AirBNB users are older and don't want a unit where they have to walk up 4 flights of stairs, or even 1 in the case of those with a mobility problem. AirBNB lets you say "elevator in building." which is good, but it should really be "Elevator in Building OR unit is on ground floor" -- and I think that people should actually check that box for ground floor units until AirBNB fixes that. Of course be clear in the listing on that, or on how many floors the guest will need to climb, and whether there will be assist for luggage.
The camera industry is about to come crashing down thanks to the rise of computational photography.
Many have predicted this for some time, and even wondered why it hasn't happened. While many people take most of their photos with their cell phones, at this point, if you want to do serious photography, in spite of what it says on giant Apple billboards, you carry a dedicated camera, and the more you want from that camera, the bigger the lens on the front of it is.
That's because of some basic physics. No matter how big your sensor is, the bigger the lens, the more light that will come in for each pixel. That means less noise, more ability to get enough light in dark situations, faster shutter speeds for moving subjects and more.
For serious photographers, it also means making artistic use of what some might consider a defect of larger lenses -- only a narrow range of distances is in focus. "Shallow depth of field" lets photographers isolate and highlight their subjects, and give depth and dimensionality to photos that need it.
So why is it all about to change?
Traditional photography has always been about capturing a single frame. A frozen moment in time. The more light you gather, the better you can do that. But that's not the way the eye works. Our eyes are constantly scanning a dynamic scene in real time, assembling our image of the world in our brains. We combine information captured at different times to get more out of a scene than our eyes as cameras can extract in a single "frame" (if they had frames.)
Computational photography adds smart digital algorithms not just to single frames, but to quickly shot sequences of them, or frames from multiple different lenses. It uses those to learn more about the image than any one frame or lens could pull out.
NHTSA released their latest draft robocar regulations just a week after the U.S. House passed a new regulatory regime and the senate started working on its own. The proposed regulations preempt state regulation of vehicle design, and allow companies to apply for high volume exemptions from the standards that exist for human-driven cars.
It's clear that the new approach will be quite different from the Obama-era one, much more hands-off. There are not a lot of things to like about the Trump administration but this could be one of them. The prior regulations reached 116 pages with much detail, though they were mostly listed as "voluntary." I wrote a long critique of the regulations in a 4 part series which can be found in my NHTSA tag. They seem to have paid attention to that commentary and the similar commentary of others.
At 26 pages, the new report is much more modest, and actually says very little. Indeed, I could sum it up as follows:
The document does a better job at understanding the difference between goals -- public goods that it is the government's role to promote -- and approaches to those goals, which should be entirely the province of industry.
The new document is much more explicit that the 12 "safety design elements" are voluntary. I continue to believe that there is a risk they may not be truly voluntary, as there will be great pressure to conform with them, and possible increased liability for those who don't, but the new document tries to avoid that, and its requests are much milder.
The document understands the important realization that developers in this space will be creating new paths to safety and establishing new and different concepts of best practices. Existing standards have value, but they can at best encode conventional wisdom. Robocars will not be created using conventional wisdom. The new document takes the approach of more likely recommending that the existing standards be considered, which is a reasonable plan.
My own analysis is guided by a lightweight regulatory approach which has been the norm until now. The government's role is to determine important public goals and interests, and to use regulations and enforcement when, and only when, it becomes clear that industry can't be trusted to meet these goals on its own.
In particular, the government should very rarely regulate how something should be done, and focus instead on what needs to happen as the end result, and why. In the past, all automotive safety technologies were developed by vendors and deployed, sometimes for decades, before they were regulated. When they were regulated, it was more along the lines of "All cars should now have anti-lock brakes." Only with the more mature technologies have the regulations had to go into detail on how to build them.
Worthwhile public goals include safety, of course, and the promotion of innovation. We want to encourage both competition and cooperation in the right places. We want to protect consumer rights and privacy. (The prior regulations proposed a mandatory sharing of incident data which is watered down greatly in these new regulations.)
The NTSB (National Transportation Safety Board) has released a preliminary report on the fatal Tesla crash with the full report expected later this week. The report is much less favourable to autopilots than their earlier evaluation.
How will robocars fare in a disaster, like Harvey in Houston, Irma, or the tsunamis in Japan or Indonesia, or a big Earthquake, or a fire, or 9/11, or a war?
These are very complex questions, and certainly most teams developing cars have not spent a lot of time on solutions to them at present. Indeed, I expect that these will not be solved issues until after the first significant pilot projects are deployed, because as long as robocars are a small fraction of the car population, they will not have that much effect on how things go. Some people who have given up car ownership for robocars -- not that many in the early days -- will possibly find themselves hunting for transportation the way other people who don't own cars do today.
It's a different story when, perhaps a decade from now, we get significant numbers of people who don't own cars and rely on robocar transportation. That means people who don't have any cars, not the larger number of people who have dropped from 2 cars to 1 thanks to robocar services.
I addressed a few of these questions before regarding Tsunamis and Earthquakes.
A few key questions should be addressed:
Most of these issues revolve around fleets. Privately owned robocars will tend to have steering wheels and be usable as regular cars, and so only improve the situation. If they encounter unsafe roads, they will ask their passengers for guidance, or full driving. (However, in a few decades, their passengers may no longer be very capable at driving but the car will handle the hard parts and leave them just to provide video-game style directions.)
An immediately positive thing is the potential ability for private robocars to, once they have taken their owners to safety, drive back into the evacuation zone as temporary fleet cars, and fetch other people, starting with those selected by the car's owner, but also members of the public needing assistance. This should dramatically increase the ability of the car fleet to get people moved.
Nonetheless, it is often noted that in a robocar taxi world, there don't need to be nearly as many cars in a city as we have today. With ideal efficiency, there would be exactly enough seats to handle the annual peak, but few more. We might drop to just 1/4 of the cars, and we might also have many of them be only 1 or 2 seater cars. There will be far fewer SUVs, pickup trucks, minivans and other large cars, because we don't really need nearly as many as we have today.
For those in Silicon Valley, I will be giving a talk at the monthly autonomous vehicle enthusiast meetup. Some time ago I did my general talk, but this one will get into the meat on some of the big myths and issues. With luck we'll get some good debate going.
For many decades I've had an ongoing debate with my friend David Brin over the ideas in his book The Transparent Society where he ponders what happens when cameras and surveillance technology become so cheap it's impossible to stop them from being everywhere.
I was just outside Weiser Idaho, a small town on the Snake river, for the 2017 Eclipse, which was an excellent, if short, spectacle which reawakened U.S. interests in total eclipses. They are, as I wrote earlier, the most spectacular natural phenomenon you can see on the Earth, but due to their random pattern it's been a long time since one has covered so much of the world's richest country.
For me, it was my sixth total eclipse, but the first I could drive to. I began this journey in Mexico in 1991, with the super-eclipse of that year, which also was the last to visit the United States (it was visible on the big island of Hawai`i.) Since then I have flown around the world to the Curacao area, to the Black Sea, to the Marshall Islands (more photos) and French Polynesia to see other total eclipses. And I will continue to do so starting with 2 years from now in Argentina.
I recommend before you read that you enjoy my Gallery of 2017 Eclipse Photos in HD resolution. When going through them I recommend you click the "i" button so you can read the descriptions; they do not show in the slide show.
I did not photograph my first eclipse (nor should anybody) but every photographer, seeing such a spectacle, hopes to capture it. We can't, because in addition to being the most spectacular natural event, it's also the one with the greatest dynamic range. In one small field you have brilliant jets of fire coming off the sun, its hot inner atmosphere, its giant glowing outer atmosphere and a dimly lit dark sky in which you can see stars. And then there is the unlit side of the moon which appears to be the blackest thing you have ever seen. While you can capture all these light values with a big bracket, no display device can come close to showing that 24 stop range. Only the human eye and visual system can perceive it.
Some day though, they will make reasonable display devices that can do this, but even then it will be tough. For the eclipse covers just a few degrees of sky, but in reality it's a full 360 experience, with eerie light in all directions and the temporary light of twilight in every direction. Still, we try.
In the future, when there is a retinal resolution VR headset with 24 bits of HDR light level ability, we might be able to show people an eclipse without going to one. Though you should still go.
That's why these photographs are so different. Every exposure reveals a different aspect of the eclipse. Short exposures show the prominences and the "chromosphere" -- the inner atmosphere of the sun visible only at the start and end of the eclipse. Longer exposures reveal more of the giant corona. The fingers of the outer corona involve 2 or 4 second exposures! The most interesting parts happen at 2nd and 3rd contact (the start and end) and also have many aspects. About 1/60th of a second shows the amazing diamond ring by letting the tiny sliver of sun blow out the sensor to make the diamond, as it does to the eye.
One thing that saddens and frustrates me is that all of this is only visible in a band less than 100 miles wide where the eclipse is total. Outside that, for thousands of miles, one can see (with eye protection) a "partial eclipse." They both get called an eclipse but the difference is night and day. Yet I think the naming makes people not understand the difference. They think a "90% partial eclipse" is perhaps 90% as interesting as a total eclipse. Nothing could be more wrong. There are really three different things:
I constantly meet people who think they saw "the eclipse" when to me and all others who have seen one, only the total eclipse is the eclipse. While the 98% partial is interesting, nobody should ever see that, because if you are that close to the band of totality, you would be nuts not to make the effort to go that extra distance. In a total eclipse, you see all that the partial has to offer, and even a few partial effects not seen except at 99.9%
As such, I propose we rename the partial eclipse, calling it something like a "grazing transit of the moon." An eclipse technically is a transit of the moon over the sun, but my main goal is to use a different term for the partial and total so that people don't get confused. To tell people in the partial zone "you saw a transit, hope it was interesting" while telling people in the total zone, "You saw a solar eclipse, wasn't that the most amazing thing you've ever seen?"
This was the first eclipse I have ever driven to, and because of that, I went a bit overboard, able to bring all sorts of gear. I had to stop myself and scale back, but I still brought 2 telescopes, 4 cameras, one long lens, 5 tripods and more.
Last night, as they were towing our plane from the gate in Miami there was a very unusual bump -- turns out they put the tow bar on wrong and damaged the landing gear. It became clear in time that we would not fly that night (FA timeout loomed.) I've seen this a lot, so I was on the phone immediately to book another flight, but I would still need a hotel voucher for the night, as would most other folks on the flight, even if they took the same flight the next day after the repair.
E-mail is facing a decline. This is something I lament, and I plan to write more about that general problem, but today I want to point out something that is true, but usually not recognized. Namely that E-mail today is often secure in transit, and we can make better use of that and improve it.
The right way to secure any messaging service is end-to-end. That means that only the endpoints -- ie. your mail client -- have the keys and encrypt or decrypt the message. It's impossible, if the crypto works, for anybody along the path, including the operators of the mail servers as well as the pipes, to decode anything but the target address of your message.
We could have built an end-to-end secure E-mail system. I even proposed just how to do it over a decade ago and I still think we should do what I proposed and more. But we didn't.
Along the way, though, we have mostly secured the individual links an E-mail follows. Most mail servers use encrypted SMTP over TLS when exchanging mail. The major web-mail programs like Gmail use encrypted HTTPS web sessions for reading it. The IMAP and POP servers generally support encrypted connections with clients. My own server supports only IMAPS and never IMAP or POP, and there are others like that.
What this means is that if I send a message to you on Gmail, while my SMTP proxy and Google can read that message, nobody tapping the wire can. Governments and possibly attackers can get into those servers and read that E-mail, but it's not an easy thing to do. This is not perfect, but it's actually pretty useful, and could be more useful.
We're all shocked at the idea of a growing neo-Nazi movement, at the horrible attack in Virginia and the lack of condemnation by the President. It's making us forget that the neo-Nazi radical right are trolls with many parallels to online trolls. And the only thing to do is not to feed the trolls, and definitely don't attack the civil rights that they make use of.
A protest march has 3 main functions:
I will be heading to western Idaho this weekend to watch my sixth total Eclipse. That makes me a mid-grade eclipse chaser, so let me tell you some important things you need to know, which are not in some of the other eclipse guides out there. For good general sites look at places like NASA's Eclipse Guide which has nice maps or this map.
The difference between a total solar eclipse and a partial one -- even a 99% partial one -- is literally and metaphorically night and day. It's like the difference between sex and holding hands. They are really two different things with a similar sounding name. And a lunar eclipse is again something vastly different. This does not mean a high-partial eclipse is not an interesting thing, but the total eclipse is by far the most spectacular natural phenomenon visible on this planet. Beyond the Grand Canyon, Yosemite, Norway, etc. So if you can get to totality, get there. Do not think you are seeing the eclipse if you don't get into the zone of totality.
Many people seek to get close to the centerline of the eclipse. This provides the longest eclipse for your area. You will only lose a modest number of seconds if you are within 15 miles of the centerline, so you don't have to get exactly there, and in fact it may be too crowded there.
On the other hand there are those who deliberately get close to the edge, giving up 30-40% of their eclipse time in order to see more "edge effects." Near the edge, the edge effects are longer and a bit more spectacular. In particular the diamond ring will be a fair bit longer, and you may see more prominences and chromosphere for longer. If this is your first eclipse, I am not sure you want to get too close to the edge. But try any of the map web sites that will tell you your duration, and get somewhere that has within 30-40 seconds of the centerline time.
You've been hearing endless talk about eclipse glasses and how well made they are. Eclipse glasses are only for the boring partial phase. They give you a way to track the progress of the moon while waiting for the main event. Once totality is over, everybody packs up and does not even bother to watch the 2nd half of the partial eclipse, that's how boring the partial part is.
But don't be one of those people who, told about the danger of eclipses, does not watch totality with your bare eyes. In fact, use binoculars in addition to your naked eyes, and perhaps a short look through a telescope -- but not during the diamond rings or any partial phase.
Update: There is a nice large sunspot group that should still be there on Eclipse day, making the partial phase more interesting to those with good eyesight.
In totality you are looking not at the sun, but its amazing atmosphere -- the "corona" -- full of streamers, and many times the size of the sun or moon. You may also see jets of fire coming off the sun, and at the start and end of totality you will see the hot red inner atmosphere of the sun, known as the chromosphere.
If you are crazy enough to be outside the total zone but close to it, you sadly still can't look with your bare eyes at any part of the eclipse.
An eclipse is most glorious in the sky but a lot of other things happen around it. As it gets very close to total you will see the nature of the sunlight change and become quite eerie. Shadows of trees will turn into collections of crescents. About 20-60 seconds before and after totality, if you have a white sheet on the ground, you will see ripples of light waving, like on the bottom of a giant swimming pool. And the shadow. You will see it approach. If you are up on a mountain or in a plane this will be more obvious. It is going at 1,000 to 2,000 miles per hour.
Almost all robocars use maps to drive. Not the basic maps you find in your phone navigation app, but more detailed maps that help them understand where they are on the road, and where they should go. These maps will include full details of all lane geometries, positions and meaning of all road signs and traffic signals, and also details like the texture of the road or the 3-D shape of objects around it. They may also include potholes, parking spaces and more.
The maps perform two functions. By holding a representation of the road texture or surrounding 3D objects, they let the car figure out exactly where it is on the map without much use of GPS. A car scans the world around it, and looks in the maps to find a location that matches that scan. GPS and other tools help it not have to search the whole world, making this quick and easy.
Google, for example, uses a 2D map of the texture of the road as seen by LIDAR. (The use of LIDAR means the image is the same night and day.) In this map you see the location of things like curbs and lane markers but also all the defects in those lane markers and the road surface itself. Every crack and repair is visible. Just as you, a human being, will know where you are by recognizing things around you, a robocar does the same thing.
Some providers measure things about the 3D world around them. By noting where poles, signs, trees, curbs, buildings and more are, you can also figure out where you are. Road texture is very accurate but fails if the road is covered with fresh snow. (3D objects also change shape in heavy snow.)
Once you find out where you are (the problem called "localization") you want a map to tell you where the lanes are so you can drive them. That's a more traditional computer map, though much more detailed than the typical navigation app map.
Some teams hope to get a car to drive without a map. That is possible for simpler tasks like following a road edge or a lane. There you just look for a generic idea of what lane markings or road edges should look like, find them and figure out what the lanes look like and how to stay in the one you want to drive in. This is a way to get a car up and running fast. It is what humans do, most of the time.
Most teams try to do more than driving without a map because software good enough to do that is also software good enough to make a map. To drive without a map you must understand the geometry of the road and where you are on it. You must understand even more, like what to do at intersections or off-ramps.
Creating maps is effectively the act of saying, "I will remember what previous cars to drive on this road learned about it, and make use of that the next time a car drives it."
Put this way it seems crazy not to build and use maps, even with the challenges listed below. Perhaps some day the technology will be so good that it can't be helped by remembering, but that is not this day.
There are many strong advantages of having the map:
One intermediate goal might be to have cars that can drive with only a navigation map, but use more detailed maps in "problem" areas. This is pretty similar, except in database size, with automatic map generation with human input only on the problem areas. If your non-map driving is trustworthy, such that it knows not to try problem areas, you could follow the lower cost approach of "don't map it until somebody's car pulled over because it could not handle an area."
There are two or three components of the maps people are building, in order to perform the functions above. At the most basic level is something not too far above the navigation maps found in phones. That's a vector map, except with lane level detail. Such maps know how many lanes there are, and usually what lanes connect to what lanes. For example, they will indicate that to turn right, you can use either of the right two lanes at some intersections.
Ten years ago, I asked Cell companies to let me have more than one phone on the same number. Recently I noticed the ability to almost do that with Google Project FI cell service.
Something I do from time to time is a road trip in a rental car. And while car rental companies much prefer the business customer who rents a big car at a high price, then just drives it to their meeting and back to the airport, they are not averse to the less profitable road trip business.
So here are some things they could do to make it better for that sort of customer.
I've written before about overbooking and how it's good for passengers as well as for the airlines. If we have a service (airline seats, rental cars, hotel rooms) where the seller knows it's extremely likely that with 100 available slots, 20 will not show up, we can have two results:
