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I have a copy but don't really use it anymore. iGIS is one of them, it keeps getting new features with each update. Now you might be able to accomplish this solely on iOS, there are a couple apps I have used that have a lot of capabilities.
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qGIS is one program that could do this, it runs on Macs and PCs and I think there is even an Android version:
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Of course, you will need a computer and software for making this kind of map.
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Here's an example of a map I created in this format, the download includes full documentation: I do this with Mobile Atlas Creator, a free open source platform for exporting maps to all kinds of devices. I make maps on a Windows computer but then distribute them in a format that can be used on iOS, Android, MacOS, Windows and Linux. There are many iOS apps that could be used in either scenario. So I’ll be taking my laptop and two GPS receivers to a nearby National Geodetic Survey benchmark over the next few days, along with DOP plots for various times of the day, to see how closely the GPS positions agree with the benchmark position determined with a high degree of accuracy.Just to be clear: you want to make maps yourself and then share them with other people as opposed to using maps that someone else made?
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How reasonable, and which average is the better one? And how does the positional accuracy depend on the type/brand of GPS receiver? I can’t say from the data above, since I don’t know the exact coordinates of the position where my Bluetooth GPS receiver is currently sitting. Using this Survey averaging function, and a knowledge of what affects GPS accuracy, you could in principle determine the geographic coordinates of a position with reasonable accuracy. Finally, you can save the plotted data and averages as a *.pth file, and open it later on unfortunately, you can’t access the individual point position data, as it’s a binary format. Under the Survey Settings menu, you can set the maximum acceptable value of DOP for a point to be used in averaging, rejecting points with potentially poorer accuracy for determining an average position. In the map window, averages are plotted as crosses and the standard deviations as axes of an ellipse, green for arithmetic, black for least-squares.Īt the bottom of the data display, you can see the instantaneous Dilution of Precision values, as well as the number of measurements that fall within the specified DOP bounds (the lower the DOP, the better). Standard deviations are also given for both sets of statistics. In principal, the latter can give you a more accurate average, since it won’t affected as strongly by a single outlier point as the arithmetic mean. There are two averages that you can measure: the arithmetic mean (sum of all data divided by the number of points), and a least-square average (minimizing the squares of the differences between the mean and all the points together). The measured altitude is plotted versus time, with the average altitude as horizontal green line:Īnd there’s a data display window that shows average and standard deviation data for latitude/longitude/altitude: Positions are plotted as small blue “x”es: It will gather position data, and plot it in the top map window so that you can observe how the measured GPS position changes with time. Survey Window – This is the most interesting and unique function. Navi gation Window – Shows latitude, longitude and altitude if you’re in motion, also shows speed and distance traveled: For WAAS satellites, like #48 below, there is no almanac, so the signal bar is always gray:Īzimuth And Elevation Window – Shows the position of the GPS satellites above the horizon: Signal Quality – Displays the signal strength of the GPS satellites acquired by the receiver, and whether the almanac data has been received – gray for no, solid blue for yes. You have the option of saving this data as it arrives to a text file. Note: A version of VisualGPS with similar functionality is also available for Windows CE/Mobile devices.Īfter you’ve installed the Visual GPS program, started it up, and configured it to connect to your NMEA COM port (perhaps the one defined by XPort, described in yesterday’s post), you’ll have access to five function panels from the toolbar:Ĭommand Monitor Window – Displays the NMEA text strings as they come in. But my current program of choice is VisualGPS, because in addition to several commonly-found functions, it has one potentially very useful function that I haven’t found in any other similar program.
#GPS FILE DEPOT APP FOR FREE#
If you own an NMEA-capable GPS receiver, there are a substantial number of programs available for free that can monitor and display NMEA data.