This tag refers generically to *any* space-based satellite navigation system that provides location and time information.

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Generating Random Location (newLat,NewLon) given current position lat,lon)

I have been trying to implement a method described on this site to generate a random location given my current position. It is described here: How to generate random locations nearby my location?. ...
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47 views

How to measure RTK accuracy of a moving vehicle?

I am currently working with tractors using a RTK enhanced automated steering system. One of the biggest problems is that even RTK can have a inaccuracy of 2cm. This can be too much for some possible ...
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1answer
170 views

Does GPS correct for continental drift?

Does GPS correct for continental drift, and if so, how? (I'm mainly interested from the perspective of consumer devices such as smartphones.)
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108 views

Getting OpenLayers degrees rotation to point right way?

I am working on a fairly simply proof of concept for a tutorial to blog. At the moment it is simply to show how a SatNAV type functionality could be achieved in a browser - However I cannot for the ...
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0answers
77 views

GLONASS speed and altitude limitations

I'm looking for some info about the possible limitations for the GLONASS navigation system, something similar to the GPS COCOM limits. Is there any limitation on speed AND/OR altitude for this ...
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1answer
85 views

Analyzing long lat location data to find locations in proximity

I am looking for a tool to analyze location data (long lat values from vehicle GPS available). The goal is to identify locations which are in close proximity (within a circle of 30-60ft) and then ...
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3answers
763 views

Real time map matching using ArcGIS Desktop?

I am working on a project which requires real time map matching. I am currently using ArcGIS but not sure whether it will work. Here is what happens with my system: the cell phones sent GPS fixes ...
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1answer
137 views

How to parse EXIF GPS information to lat,lng decimal numbers

"EXIF_GPSAltitude": "(220.279)", "EXIF_GPSLatitude": "(55) (40.711) (0)", "EXIF_GPSLatitudeRef": "N", "EXIF_GPSLongitude": "(8) (30.2282) (0)", How should i understand above example as degree, min, ...
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11answers
4k views

Mobile Data collection options

What COTS software is available to do mobile data collection, with GPS positioning. Map display not required. I'm looking across the board (platform wise). I'm already aware of... RhinoSpect ...
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3answers
270 views

How to calculate 'off track' error from GPS data?

I'd like to analyse navigational accuracy, comparing planned transects with the actual track flown from GPS data. For example, the planned transects below (green) don't match perfectly with the ...
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2answers
218 views

Read position from windows tablet GPS

I have a Lenovo Miix 2 tablet and I am developing a project with a Java servlet. I want to read GPS data in my project. Can I read this data using Java? and/or HTML5? update: In this project, I can't ...
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2answers
154 views

How can I find GPS coordinates of the geographic center of US counties?

How can I find a list of the GPS coordinates of the geographic center of each US county?
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2answers
151 views

Mapping raw GPS data to Openstreetmap's Node/Way/Relation

So, I have a bunch of raw GPS data points which constitute trips. I want to add semantic information to those data points. For example I'd like to be able to say that a trip consisted of taking street ...
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1answer
167 views

cross platform Mobile tracking app to report to custom server?

Does any one know of IOS, Andriod apps for asset tracking that I can point to my server? I can then write some code to intercept the messages from the mobile app. ideally a solution which works on ...
2
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1answer
50 views

Calculating a point Lat/Lon from another Lat/Lon point angle

I need help for a solution of this problem to make an algorithm: : I have a point O center of a circle of radius r, on this circle there is two point P1 and P2. I know latitude and longitude of ...
4
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3answers
210 views

How can I add 3 axis orientation information to my photos?

I have a survey project where I need to record not only the location, but the direction (bearing and angle of elevation/depression) that the camera was pointing at the time the picture was taken. ...
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0answers
42 views

How do I compute uncertainties in the positions transformed using Helmert transformation?

I am familiar with Python, MATLAB and Mathematica. My data is given by Cartesian coordinates (positions in X,Y,Z (meters), standard deviations XX, YY, ZZ (meters) and a correlation matrix (XY, YZ, ...
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2answers
1k views

How do GPS/Glonass/Galileo satellite know their position?

We use satellites to calculate our position. How do satellites know their position if it is right or wrong ? I have heard that the base station records and corrects the satellite path but how do they ...
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4answers
162 views

Count consecutive points in a polygon

I have animal relocation data and want to know how many times that animal walked within a polygon for more than one step (i.e there is more than one point within a polygon). I am more interested in ...
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0answers
21 views

KML To Automobile GPS

I've created a bunch of Placemarks and have them in a kml file. Is there a way to get this into the GPS of a car?
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0answers
27 views

Differential Correction Wizard Doesn't Pop Up?

Any Trimble GPS Pathfinder Office users out there ever run into this problem? When I try to run the differential correction wizard the program stutters for a brief second then nothing happens. All ...
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2answers
1k views

How much sense does it make to average (lat,lon) samples in order to increase 2D accuracy of a GPS location?

Several GPS applications, like this one, or this one, acquire multiple (lat,lon) samples of a given location, assuming that the GPS unit is not moving, and then take an average of the samples in order ...
2
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2answers
156 views

Finding all ways that are partly within a bounding box

I'm trying to write a query that will return all OSM ways which are contained within a bounding box of min/max gps coordinates. I get these cooridinates from the greater london bounding box on ...
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2answers
400 views

Measuring Continuous Distance of GPS track in ArcGIS Desktop

I am looking for a way to quickly measure the distance covered of GPS tracks of foraging Seabirds. A tool that could give accumulative distance of point to point from the long and lat coordinates ...
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0answers
113 views

Is it possible to calculate area of polygons from GPS points without POSTGIS

I am new with GIS. Assume we use the UTM30N coordinate system. Is it possible to calculate an area (say a square box) by the 4 given points? (assume the points are in order, and the coordinates are ...
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0answers
38 views

True Altitude of GPS cooridnates

Given two points a=(lat1, long1) , b=(lat2, long2). I want to divide the line between a and b into points with equidistant length. (for example 100 Points) For each of these points i need to ...
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41 views

Is there any application that gives the real absolute altitude?

I defined a test already and I would like to compare the altitudes measured by different sources. I drove a path by a car, mounted a GPS and a pressure sensor in the vehicle. On the chosen path, there ...
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2answers
114 views

Compass Navigation With ArcGIS SDK for iOS

There's a sample provided by esri named GpsSample (I can't find a way to upload it here) Anyway, the sample includes multiple selections for mapview's locationDisplay autoPanMode property I'm trying ...
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1answer
23 views

Is there an Internet resource for GPS timeline?

I'm looking for a timeline of the evolution of GPS technology and accuracy for both civilian and military systems (since the advent of GPS). Any info will help.
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1answer
46 views

Determine when heading off course

How does google or other map providers with routing capabilities determine when you are not staying at the right course? I am trying to figure out how to implement this feature in my gps that I am ...
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224 views

Building a private GPS almanac server - practical experience

I'm trying to provide a source of GPS almanac files (in SEM format) for a non-connected / sometimes connected network. I know that I can download them from the USCG NAVCEN. However I don't want to ...
2
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1answer
61 views

Topology Editing using ArcView (now called Basic) license level of ArcGIS Desktop?

I am building a geodatabase from data collected on a GPS handheld in the field. The GPS device collects decently accurate information but I need to make sure all the polygons, lines, and points are ...
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0answers
230 views

Collector for ArcGIS PDOP and GPS collection configuration settings

My company just acquired a Geneq SXBlue II GPS receiver to pair with an iPad and the Collector for ArcGIS app. The functionality is awesome and loved by everyone, but since we have biologists on our ...
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143 views

Anyone know an iOS data collection app that exports raw GNSS data for differential correction?

I am pretty sure the answer to this is "No", but throwing this question out there in case someone knows of something I haven't stumbled across yet. I am seeing less expensive GNSS units show up on ...
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1answer
141 views

How do I force gpspipe to read from a USB Serial device rather than a server address with a port and everything

I'm desperately trying to grab the simplest piece of information I can out of my usb dongle from the command line. A program of mine needs to use it so it has to be a STDIN/STDOUT type solution. I ...
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1answer
99 views

How to compare GPS absolute positioning receiver accuracy

I have two different types of GPS modules which are in absolute positioning mode (pseudorange data) Lets say one of them is attached in microcontroller (such as arduino, rasbpy, etc) and the other ...
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0answers
53 views

QGIS linked to camera for GPS based triggering?

Has anybody done this yet? I'm new to QGIS and have just started exploring. I'd like to integrate flight lines and camera triggering if anybody can direct me to the right forum or area. Thanks!
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2answers
777 views

Does iOS know the phone's location solely from cell tower, i.e. without GPS data?

Question Does the iOS operating system know the phone's location even if one could turn off the iPhone's built-in GPS module or if it was broken? Elaboration What I understand I understand that ...
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1answer
42 views

I want to trace a gps device

I want to create a device that should transmit its location to a server using anyother medium other than GSM. Bascially I need a tracking device which i could give to my worker and he goes to a forest ...
3
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1answer
58 views

Is there a method to tell which hemisphere a point belongs to, in WGS84 geoid, where the equator is an arbitrary ellipsis?

I use the WGS84 geoid (because I'm working with a GPS chip). I define an ellipsis that splits the surface in two parts, lets name these 'A' and 'B'. This ellipsis is defined by two points 'a' and ...
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27 views

How to get correct measure with PostGIS SQL query? [duplicate]

First of all, sorry my bad english. I am new at gis. So I want to measure my road. I want to use measure unit kilometers. But I am a bit confused. I have a garmin etrex gps device. So I get my ...
2
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2answers
198 views

Detecting patterns in vehicle GPS data [closed]

I need to analyze data uploaded from vehicle GPS devices to detect travel patterns and then attempt to learn about the normal travel patterns for that vehicle so that predictions can be made about ...
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2answers
137 views

Where can I find the coordinate system used by GPS

How do you determine which geographic coordinate system is used by a GPS device? For example, my Garmin GLO is outputting NMEA data with lat/lon. What system is represented by those lat/lon values? I ...
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1answer
111 views

Getting GPS coordinates perpendicular and parallel to AB

I already posted this question here And I got the solution thanks to Fang but the problem is that the coordinates I need to use are GPS coordinates and apparently GPS needs a different formula than ...
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2answers
45 views

Deployment of Zeno Field 3.11 in windows 8.1

Is it possible to install Zeno Field 3.11 in windows 8.1?
2
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4answers
137 views

Where to license non-automotive POIs for France, Spain and Portugal?

qualified POIs are needed for a commercial project - should cover broad out-of-car usecases (not needed: parking, gas stations). Could be commercially licensable data or derived from national geodata ...
5
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1answer
427 views

How to connect particular sets of points with (poly)lines?

I think my problem is quite easy to be solved by the most postgis-users, but i am a bloody beginner: i have a timestamped point-table representing GPS-tracked places of different cars. To distinguish ...
2
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1answer
86 views

How to find if two gps tracks were from the same trip?

Given I have gps tracks from many users running or hiking, how can I find out who were running together? In other words, which algorithms are there to find out who were in the same party? Haven't ...
12
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2answers
531 views

Why does GPS altitude jump sometimes?

I am currently developing a little application in Android which uses GPS. When i click a button i start to record a "track". If i walk around i save my position every second into a file. This works ...
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1answer
85 views

Benefit of DGPS for relative accuracy and speed measurements for receivers close-by each other

Consider that we are interested only in the speed and relative position accuracy of GPS receivers (i.e. their absolute try position on earth is NOT important). These receivers are all in a 90m x 90m ...