When I’m stuck in traffic, it will often neglect to update the arrival time, even after the point where it would take an actual violation of the laws of physics to get there by the indicated time. To learn more, see our tips on writing great answers. Google Maps and iOS use data related to traffic reports from Waze. However, the problem is that the GPS datum will jump quite wildly and hence the Hopf algebra with a non-grouplike invertible element. Real time calculation is really important as all i want is a relatively precise ETA that changed in real time. The recent solar flare may be causing problems with GPS. dist)/(avg dist), What is the average time/average distance you mentioned. The algorithm is simply to use a rule of three to project the ETA by comparing the average distance in the history at the current time with the real-time distance. Unix sed command to replace brackets in file. The problem is,how to implement and what is the algorithm in ETA implementation. just simply ignore the traffic light i guess, i also have the data of the bus stop's coordinates, does that help? The estimated time will also get more accurate to the actual arrival time as you get closer to the destination. Even if it pays no attention to instantaneous speed. Really, please, people, I’ve been in GIS before it was called GIS (it was AM\FM [Automated Mapping and Facilities Management]). If you are slowed by heavy traffic at 40 in a 55 for miles at a time, it doesn’t notice or care. It wouldn’t make any sense to base the calculation on your current speed. The data in the system is pretty damn good. Kalman Filter? I'm getting a callback with latitude and longitude, how can I best calculate “current speed”, and other derived values? I just got back home from a 600 mile trip and on the way I kept looking at my GPS and got a bit annoyed. arival times? How does GPS calculate est. !” The problem is that all it has is a picture of a road, just like it has pictures of railroad tracks, rivers, etc. Hello Everyone, Sorry for being dumb, i really want to get things clearly. It didn’t seem that the GPS ever adjusted the arrival time to coincide with the increase in speed. How to make use of these data to calculate the ETA for customer? I've only had my car 1 1/2 weeks, but I'm noticing that when using the GPS the estimated time of arrival is way off the mark. 5 years ago. Simple math. Lyla. In CS, what do you call this type of problem? The position accuracy is primarily dependent on the satellite position and signal delay. spark240 has it. How to transform this logical if-then constraint? How do I total several columns up to a certain point? Easy peasy. how to make navigation with 3-axis accelerometer and 3-axis gyroscope and gps, calculating accumulated distance using GPS(cannot call run method), Prevent estimated time of arrival degradation with Android GPS, Kalman-filtered GPS data is still fluctuating a lot. Anyways, I guess my real question is, does the GPS approximate your arrival time based on a pre-programed speed for each kind of road and just guesses the arrival time based on that or does it actually base the est time on your current speed? The method of shipping can be via air, ocean or by domestic shipping services such as rail or truck. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. I don't think it's that simple. My TomTom recalculates the time on the fly, as well. The estimated time of every task will be added to the travel time. Just doing a little quick math, you only increased your speed 30% (from 65 to 85MPH) and for only about 5% of the whole journey (half an hour from a total of say maybe nine hours?) If remaining time = (total time)*(total dist-current dist)/(total dist) then i understand very clearly. New maps are available, but they can only provide whatever data the software is willing to use. The historical data could help in estimating the ETA, but in real life traffic conditions varies, the best way is to implement the historical data such as bus schedule and real time calculation. In my experience it usually starts off with a rather conservative estimate, such that on clear roads you can usually shave off 7 or 8 minutes per hour. And the most important question is: how? Definition: Estimated time of arrival (ETA) is the time interval at which a certain vehicle will arrive its destination. Algorithm about ETA (Estimated time of arrival), Podcast 315: How to use interference to your advantage – a quantum computing…, Level Up: Mastering statistics with Python – part 2, Opt-in alpha test for a new Stacks editor, Visual design changes to the review queues. It assumes you are just about to resume driving at (or above) the speed limit. GPS systems are able to provide ETA information that is calculated on a vessel's speed over ground and the distance to travel. During a day, a manager may see the progress of work for every employee. GPS units can very accurately know your current speed, but it's unclear whether some factor that in when calculating your ETA. You look at the map and say “Stupid box! The frustrating part is that it does not make any allowance for time at red lights or stop signs so it is overly optimistic about travel times on local roads. Like in similar products, Google maps ETAs are based on a variety of things, depending on the data available in a particular area. GPS satellites simultaneously transmit synchronized time and orbital data to Earth. i already have the distance data between stops, the distance between 2 coordinates are the bus movements which i used to calculate the remaining distance. And continues to be way off well into the route. Timofey Temlyakov. Try to start simple. Because of traffic and not-straight lines, distances and speed alone are not reliable indicators. Off the top of my head, taking time zones into account for long drives; storing info when a user always deviated from a route in the same manner and using that for planning future routes; etc. question: yes, i think you do. I like to look at the time estimate and guess what time I will actually reach my destination. reducing the average speeds in its calculations during periods of high traffic By the way, this is why the VDO system displays some minor roads as gray instead of black, and shows “Correct guidance not possible” on the screen and says “You are not on a digitized road” if it is currently giving directions. speed calculated is really messy. Did Moses worship Egyptian gods while living in the palace? I did something similar in school myself. You find the shortest path between A and B and the “weight” is your time (generally, it is the “cost”, which here, is measured in terms of time). But because of the huge outcry whenever anything was changed, the software stagnated and hasn’t seen an update in years. To determine the best way to get from arbitrary point A to arbitrary point B, you search the graph. Thanks for contributing an answer to Stack Overflow! The time till arrival option should pop up and he can then choose that setting. I don’t think it ever considers how fast you’re actually driving, strictly the distance remaining on the planned route (and the fixed nominal speeds for each segment of that). Source(s): mapquest figure estimated travel time: https://tr.im/BdjSg. Join Stack Overflow to learn, share knowledge, and build your career. My satnav (a Garmin Nuvi) certainly recalculates the ETA “on the fly”. this can be continuously updated. surely it should know that if the trip still has a hundred mile left, it’s not going to be done in an hour – or whatever. If there is a travel delay along the route, the estimated time will show the arrival time to be later than anticipated but is still only an estimated time. Connect and share knowledge within a single location that is structured and easy to search. For really screwball routing, combine either a very old map with new software, or vice versa. I don’t know who manufactures it. You need four satellites for a basic fix, with additional satellites providing increments in accuracy in the face of sub-optimal geometries of satellites. You can sign in to vote the answer. So to answer the "Do we need more data than these?" According to them estimating the travel times of individual segments to calculate the travel time of the whole path produces inaccurate predictions. I’m a programmer. simply comparing the bus schedule won't give me actual ETA if something happens during the journey. The question is simple and direct.Please help. I think that your best bet is to use the history of the line to compare the current distance with the average distance at that time in the line, and to deduce a deviation from the average ETA. You can't predict future accidents, but if an accident happens in front of the bus, the ETA will start to slip as soon as the bus slows. This Set depart and arrive time option will now enable car users to set the departure time, the date and also the estimated arrival time at the destination. I’ve thought about this as well. /** Use Google's directions api to calculate the estimated time needed to drive from origin to destination by car. It expects that you will go those limits. With frequent GPS tracking updates, a dispatcher or fleet manager can get an accurate sense of where a vehicle is and when it’s expected to arrive at its destination. So maybe the question is, how long does your speed need to be zero, or very near it, for the ETA to take that into account? you can model a map of the world’s airports and flights and determine the cheapest way from Brasilia to Vladivostok (e.g. First road bike: mech disc brakes vs dual pivot sidepull brakes? Embedded IoT: local data storage when no network coverage. It’s quite satisfying. 0 0. It’s an extremely useful app for travelers because it helps identify the estimated time of arrival (ETA), details of routes and other information about various locations. Which only makes for an overall increase of 1.5%. Most phones use the same system. We share ETAs with restaurants and customers so they can prepare accordingly. The GPS said almost 5 hours, which I knew was wrong. use the gps data to calculate the distance travelled, and hence using the remaining distance between stops to times the portion of time needed? GPS signal speed is 300.000 km per sec. Naval Observatory (USNO) via the GPS signal in space with a time transfer accuracy relative to UTC(USNO) of ≤40 nanoseconds (billionths of a second), 95% of the time. When you drive over the posted speed limit, you are ahead of the average. What Does Estimated Time of Arrival (ETA) Mean? I spend a couple of hours shaving 15 minutes off of my arrival time and then the wife or daughter needs to stop to use the restroom. Initial ETA at a stop is time of last stop plus most recent travel time average. It is a transportation term that defines the time remaining for certain aircraft, automobile, ship or emergency service to reach the place it is directed to. So the lag is smaller than a second. If it doesn’t make a reasonable ETA based on remaining distance and a reasonable speed estimate, it is failing. So this is just a general arrival time. All GPS units work in the same manner, those in cell phones are one chip wonders that are not as able (fewer channels, poorer noise specs, slower processing) as the chipsets found in higher spec dedicated units, but they all work the same way. How to plot the following graph using TikZ? Just an idea: The bus schedule already contains info about how much time is needed between stops on average. 3. Yes, that's a good point. It will come up with things like sending you from Newark, NJ to Hartford, CT by zigzagging across every block in Manhattan. In the basis of arc sections making up, the bus stop could be determined by judging whether the bus stop is between two continuous GPS points. That’s not really the point. Waze estimate 45 + 34 + 39 = 118 minutes vs actual 50 +34+ 43 = 127 Waze under estimated time by approximately 8% with 92.9% of the actual time on … $\endgroup$ – digiogi Sep 23 '14 at 18:24 remaining time = (avg time)*(curr. Instantaneous speed for GPS units is typically based upon doppler shift of the received signal, whilst more accurate long term speed averages are calculated from location fixes. You have a picture of the road on the screen! I explained to her that the GPS systems are getting their time from SATELLITE, distinct from your vehicle clock or wrist watch which is governed by a battery. The same question comes up again. level 1 Anonymous. 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