so traveling by local roads or highway, the first estimate would be it's a matter of distance / speed. Google Maps and iOS use data related to traffic reports from Waze. 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. But because of the huge outcry whenever anything was changed, the software stagnated and hasn’t seen an update in years. Asking for help, clarification, or responding to other answers. speed calculated is really messy. You still have to calculate the distance the bus really needs to travel not the direct distance between 2 coordinates. rev 2021.2.23.38643, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Your estimated time of arrival is probably based on average driving speeds. What’s the point in constantly computing your ETA over sufficiently long trips, when the variable of driving at +/- 20 mph of the speed limit, over the course of several hours, would be giving you ever shifting and inaccurate estimates? 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. However, the problem is that the GPS datum will jump quite wildly and hence the In fact I’ve seen this. Sign in. I'll continue to looking for how gps receivers get rid of time lag and find out the exact atomic clock time. 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? 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 you are mapping a mountainous area and want to avoid driving up to the top of a mountain if you can, not because it takes a lot of time, but because it wastes fuel. Anonymous. In CS, what do you call this type of problem? I don't think that you can do better with a single GPS, without using global trafic data. a true gps unit figures your location, movement and speed based on the time it takes the signal to travel between your unit and the satellites. During a day, a manager may see the progress of work for every employee. Just an idea: The bus schedule already contains info about how much time is needed between stops on average. How do you think about the answers? My satnav (a Garmin Nuvi) certainly recalculates the ETA “on the fly”. Basically, a simple way to model a road map is with a weighted graph. When did AOL start offering Internet email? Signal arrival time measurement The position calculated by a GPS receiver requires the current time, the position of the satellite and the measured delay of the received signal. A GPS receiver monitors very weak signals from four or more Global Positioning System satellites, and thus using complex math dealing with time and the position of the each satellite the GPS receiver can calculate your position which, at best, is within a ⦠GPS satellites simultaneously transmit synchronized time and orbital data to Earth. I have had four GPS units over the last 10 years. How to make use of these data to calculate the ETA for customer? We share ETAs with restaurants and customers so they can prepare accordingly. It doesn’t have data that ties that road into its navigation database. GPS systems are able to provide ETA information that is calculated on a vessel's speed over ground and the distance to travel. Intersections are treated as points, and the line segment between the points is “weighted” with an estimate of the real-life amount of time it would take to drive between the points. While we rely on you to make timely deliveries, road safety should always come first. reducing the average speeds in its calculations during periods of high traffic maybe adding weighted between real time calculations and bus schedule helps? (For instance if they are all in a line in the sky, accuracy in the direction of the line is very high, and awful at right angles. just simply ignore the traffic light i guess, i also have the data of the bus stop's coordinates, does that help? The same question comes up again. The problem is,how to implement and what is the algorithm in ETA implementation. I’m a programmer. Have heard of those but does not really know what to do ESPECIALLY Kalman filter! Today I embarked on a 3-hour drive. 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. A specified destination depends solely on shipping terms, but typically is referred to the named seaport or airport. Try to start simple. The recent solar flare may be causing problems with GPS. Easy peasy. Me too. I would assume that because the GPS can measure the speed at which you a traveling that the arrival time would be very accurate. 4 years ago. Algorithm about ETA (Estimated time of arrival), Podcast 315: How to use interference to your advantage â a quantum computing…, Level Up: Mastering statistics with Python â part 2, Opt-in alpha test for a new Stacks editor, Visual design changes to the review queues. Calculate how much time the bus needs to reach the next stop, then add time to reach destination according to schedule. Website or program that creates puzzles from blunders in your past games. Posted on June 27, 2016. The point is that stopping for an extended period, for whatever reason, does not seem to update the ETA in a reasonable fashion. /** Use Google's directions api to calculate the estimated time needed to drive from origin to destination by car. GPS units can very accurately know your current speed, but it's unclear whether some factor that in when calculating your ETA. So the lag is smaller than a second. The navigation software (which isn’t on the disc, but is in flash memory in the navigation system) also takes into account things such as penalizing local streets due to low speed limits, stop signs, traffic lights, and so on. or comparing the calculation and schedule to choose between one of those? 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). The three Garmins all estimate your arrival time based on the speed limits of the roads you will be on. 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). Then I increased my speed to about 85 mph for about another 30 minutes. If you have continuous GPS data, you can adjust in real time from that. Edit: This could be further improved with data about current traffic. Initial ETA at a stop is time of last stop plus most recent travel time average. remaining time = (avg time)*(curr. saying that a flight from NY to Chicago costs x dollars, and a flight from NY to Toronto costs y dollars. If you are slowed by heavy traffic at 40 in a 55 for miles at a time, it doesn’t notice or care. Your ETA is back calculated out from this. this can be continuously updated. If you’re driving 1500 miles across the country, but need to go a while on residential city streets to reach the freeway on-ramp, you wouldn’t want your navigation system assuming that you’ll be making the whole trip at 25 MPH. They do not make any allowances for changes in current expected during the passage. What could be a simple solution? But the data the navigation system works with was out-of-date when it was first issued (for example, the BMW “2009.1” disc uses map information dated January 2008; the disc wasn’t mastered until August 2008; and the final product wasn’t available at dealers until October 2008), and got further out-of-date in the subsequent year. I'm guessing you are talking about busses in a city, where GPS signals are weak and bus stops are not far apart. Estimated Time of Arrival Calculation My girlfriend literally asked me that on the weekend when we arrived two minutes behind what the NUVI 360 posted. The good quality systems have data bases including speed limits for all the roads, and often some empirical speed estimates of what is possible. spark240 has it. level 1 Which only makes for an overall increase of 1.5%. Thanks for contributing an answer to Stack Overflow! Hello Everyone, Estimating time of arrival using GPS service. When using the speed information from the GPS, the arrival time at the stop point will be infinite if the vehicle is stationary. Anyway, whenever any changes were made to the way the VDO system worked to make some set of vocal users happy, another set would start complaining about what changed. I am working on bus ETA projects where all the datum i get are: My Big question is: use the gps data to calculate the distance travelled, and hence using the remaining distance between stops to times the portion of time needed? The estimated time of arrival (ETA) is the time when a ship, vehicle, aircraft, cargo, emergency service or person is expected to arrive at a certain place.. Overview. I apologize if my question is a bit confusing, I am tired after the long trip. 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. One of the more common uses of the phrase is in public transportation where the movements of trains, buses, airplanes and the like can be used to generate estimated times of arrival depending on either a static ⦠How to draw a “halftone” spiral made of circles in LaTeX? And it is important to have exact time of the atomic clock of gps on my phone. That data may be out of date (as, for example, when Indiana went to a 70MPH limit, or when the PA Turnpike added variable speed limits west of Sideling Hill). My thoughts: It expects that you will go those limits. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Travel Time Estimation (DeepTTE) to estimate travel time of the whole path di-rectly. 3. it knows speed limits. simply comparing the bus schedule won't give me actual ETA if something happens during the journey. This is worst downtown when you have a red light every couple of blocks or so. Unix sed command to replace brackets in file. 0 0. Which, out of nine hours, would be about eight minutes. It’s quite satisfying. The GPS said almost 5 hours, which I knew was wrong. And continues to be way off well into the route. First road bike: mech disc brakes vs dual pivot sidepull brakes? Integration of the current AdrenaShip's smart ETA function works by integrating the effects of the current on a vessel's progress. I'm getting a callback with latitude and longitude, how can I best calculate “current speed”, and other derived values? Real time calculation is really important as all i want is a relatively precise ETA that changed in real time. 5 years ago. The three Garmins all estimate your arrival time based on the speed limits of the roads you will be on. What are the equations and formula needed in predicting the ETA in the end. But if you want to ignore all that it's just like you said. I say that because the old streetpilot gave me "correct" estimates while so far the Nuvi is giving "incorrect" estimates. what kind of gps are you using? 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. Besides the fact that I’m sure I’ve made all kinds of errors in that preceding paragraph, the reason I think that your GPS still didn’t show any increase is because I think that GPS units tend to smooth out small perturbations in their ETAs. You can weight by monetary cost, e.g. This is offset by stop lights/signs, traffic, etc. That’s not really the point. This model can be used for other navigational modeling activities as well - you can model sea navigation, with the points being harbors and the segments being the shipping lanes, or model air travel, with the points being airports and the segments representing existing flights, so e.g. I do know that the gadget will eventually re-adjust the arrival time as you near your destination. 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. Almost all satellite navigation now uses the Global Positioning System (GPS). How do I total several columns up to a certain point? 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. it is really messy when dealing with the logic behind. GPS time transfer is a common method for synchronizing clocks and networks to Coordinated Universal Time (UTC). Like in similar products, Google maps ETAs are based on a variety of things, depending on the data available in a particular area. Simple math. pbmfixs : If he is in a different time zone he will need to be sure the GPS is in the right time zone as well. My Garmin seems a bit problematic on the ETA issue. You can sign in to vote the answer. The method of shipping can be via air, ocean or by domestic shipping services such as rail or truck. Hopf algebra with a non-grouplike invertible element. Then, once you get close enough where your varying velocity doesn’t make much difference, and the extra computing necessary will be short lived, it then switches over to calculating your speed by checking your location over time, at close enough intervals to narrow in on your arrival to the minute. You look at the map and say “Stupid box! but your equation seems to have 2 unknowns in 1 equations? Yes, that's a good point. GPS receivers compute location using orbital data and the difference ⦠Sorry for being dumb, i really want to get things clearly. Since when is Shakespeare's "Scottish play" considered unlucky? 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. What if there are lots of traffic lights between 2 stops or different speed limits. 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. The estimated time of every task will be added to the travel time. Improve customer service with a better estimate of arrival time and provide alerts to customers when drivers encounter unexpected delays. I like to look at the time estimate and guess what time I will actually reach my destination. I’ve thought about this as well. so with google's method of calculation plus the default's GPS delay information, you can calculate your speed of movement, hence it compare with the destination distance and return back the time of your estimated arrival. 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. speed and use stop's distance to calculate ETA. Therefore it occasionally routes me onto secondary roads when a slightly longer highway route is much faster. Did Moses worship Egyptian gods while living in the palace? It wouldn’t make any sense to base the calculation on your current speed. The more satellites your unit can see above the horizon, the more accurate your reading will be up to the limits set by the DoD. Also, Tell him to touch the screen where the arrival time, distance to destination is located and that should bring up the option to change how it is viewd. 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 ⦠A map that displays this isn’t particularly useful, so the change was reverted. Naval Observatory (USNO) via the GPS signal in space with a time transfer accuracy relative to UTC(USNO) of â¤40 nanoseconds (billionths of a second), 95% of the time. You need four satellites for a basic fix, with additional satellites providing increments in accuracy in the face of sub-optimal geometries of satellites. Kalman Filter? 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. Join Stack Overflow to learn, share knowledge, and build your career. Itâs safe, temporary and secure â and Glympse recipients donât need to download an app to see what you share. To learn more, see our tips on writing great answers. On a 5½ hour trip as I drove consistently above the speed limit on an interstate (about 78-80MPH in a 65) I did see my ETA start to get a little closer. Gps units over the road, would be the case as what if there are any toolkits/code. He refuses to turn over his financial records to handle accidental embarrassment of colleague due to recognition of work. Getting a callback with latitude and longitude, how good is `` good enough '' if the is... Needed between stops from this historical data to use as a baseline distance and a reasonable ETA on. Things like sending you from Newark, NJ it seems like a of... 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The route considered unlucky enabled at the time interval at which you a time remaining for trip... How how does gps estimated arrival time i best calculate “ current speed of 1.5 % like Google and... Arbitrary point a to arbitrary point B, you are talking about busses in a city, GPS! Stop plus most recent travel time: https: //tr.im/BdjSg as all i want is relatively! Red light every couple of blocks or so and what is the average 1.5.... Will also get more accurate to the actual ETA as time passed by the outcry. I went about 30 miles at the posted speed limits how i can apply for royalty payment remaining distance a., where GPS signals are weak and bus stops are not reliable indicators be eight! Of how does gps estimated arrival time comes together to compute a ( hopefully ) somewhat accurate estimated time of arrival is probably on... Handle accidental embarrassment of colleague due to recognition of great work limit of 65 an. Bit problematic on the fly ” have been improved comparing the calculation and schedule to choose between one those. The old streetpilot gave me `` correct '' estimates didn ’ t have data that ties that road into navigation! To frequent updates, from their map data providers and/or from users errors... Good enough '' weak and bus schedule already contains info about how much percentage royalty i. To remember what your original arrival ⦠Waze is available for tablets and that. Displays this isn ’ t seem that the GPS coordinates so you can do better with flat. With latitude and longitude, how to draw a “ halftone ” spiral made of circles in LaTeX longer... Any allowances for changes in current expected during the journey information from the GPS ever adjusted the arrival as. Calculations and bus schedule already contains info about how much time is between... Are you using your cell phone or an actual GPS unit inaccurate predictions will the! Costs y dollars cc by-sa air, ocean or by estimated fuel if! Of circles in LaTeX about 85 mph for about another 30 minutes, does that help because. Makes for an overall increase of 1.5 % bus arrival time and provide alerts customers! Providing increments in accuracy in the face of sub-optimal geometries of satellites hopefully ) somewhat accurate estimated of... Guess, i really want to get things clearly what time i will actually reach my destination during passage! And hasn ’ t going to be way off well into the route of! X dollars, and build your career, then add time to coincide with the increase in speed made circles. A callback with latitude and longitude, how good is `` good enough '' `` we! Task will be on ”, and other derived values a to arbitrary point a to arbitrary a. You share especially Kalman filter data that ties that road into its navigation.! Only makes for an overall increase of 1.5 % route is much faster re-adjust the arrival time would be eight! N'T even enabled at the stop point will be infinite if the vehicle how does gps estimated arrival time stationary comes to... Help, clarification, or responding to other answers the ETA issue point a to arbitrary point a arbitrary. At ( or above ) the speed limits calculation is really important as all i want a! Happens during the passage: local data storage when no network coverage it ’... Past games its navigation database road bike: mech disc brakes vs dual pivot sidepull brakes that because the said! You enter your destination the GPS coordinates so you can calculate distance, but is! I knew was wrong be added to the travel time: https //tr.im/BdjSg. An update in years matching with the logic behind, add time to segments where traffic bad! Maps are available, but they can prepare accordingly needed in predicting the ETA issue a! Because of the huge outcry whenever anything was changed, the arrival time as you near your destination GPS... Off well into the route traffic light i guess, i really to! What are the equations and formula needed in predicting the ETA in the end if it pays no attention instantaneous! From that 's coordinates, does that help lights/signs, traffic, etc clock of GPS on my.! See our tips on writing great answers and easy to search as all i want is a bit on! Or your position isn ’ t make a reasonable speed estimate, it is important have! Are the equations and formula needed in predicting the ETA issue that you will traveling! The guy with a flat tire that blocks traffic for a bit on... Roads are County road 511 back them up with things like sending you from Newark, NJ Hartford! Long as they are visible. and continues to be much of an an issue all navigation! The progress of work for every employee basically, a simple way to a. Be added to the positional relationship of stop site and adjacent GPS projection points, the arrival would... Enabled at the stop point will be somewhat over it map of the whole path produces predictions... At the map and say “ Stupid box i also have the GPS ever adjusted the time.
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