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

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Plotting UTM WGS1987 GPS data through Google Earth?

I have a UTM WGS1987 GPS data. Kindly guide how to plot this data to Google Maps. Normally this option available on Google Earth, but it doesn't appear that much of quality for presentation purpose. ...
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9answers
29k views

Why does GPS positioning require four satellites?

I have a question on the GPS positioning algorithm. In all books I've read for 3D positioning we need four satellites, and I don't understand why. We need to calculate three variables: x, y, z. We ...
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59 views

Why does my phone's GPS suffer from “urban canyon” problems in Beijing but not New York?

In a separate question on Travel.SE I asked why my phone's GPS didn't seem to work in Beijing, China. Turns out that it was simply an "urban canyon" problem, and that the GPS did in fact work when I ...
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1answer
1k views

Cheapest centimeter accurate satellite positioning (GNSS/GPS)

I am looking for a cheapest possible GNSS/GPS setup with a centimeter precision without much HW hacking. I am not able to produce my PCB or do any soldering (though I would do that if there is no ...
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0answers
1k views

Calculating compass bearing between two GPS coordinates… with a twist [on hold]

I'm building a virtual tour application that uses Google's streetview code to render the panoramas into a non-distorted view. Each panorama has 1 to n links where the user can select to move on. I ...
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1answer
12 views

For GPS point data using android, default camera app or other software?

I'm curious to know about your experience using the default android camera app for geotagging photos vs other apps. I am going to trial a few different of these apps over the next month or so on ...
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0answers
13 views

Why does my Android always show same lat/long for geotagged photos? Can I override this?

I am looking to collect point data with my Samsung Galaxy S3 using Android 4.1.2 However, every photo returns the exact same lat/long position Is it possible to override this and if so, how?
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2answers
4k views

How to capture accurate GPS points using mobile devices?

I'm currently working in Vietnam as a climbing guide, but am putting my GIS skills to use by doing a side project for the company involving the mapping of climbing routes. Along with another employee ...
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1answer
224 views

How to use OpenLayers Geolocate with the OpenGeo Suite Client SDK?

I’d like to have GPS functionality added to my OpenGeo Suite Client SDK application. From what I understand it should be possible to use the Geolocate control from OpenLayers. Preferably there ...
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1answer
159 views

Using the Live tracking with internal GPS?

We have some Panasonic ToughPads (FZ-G1) with a GPS a module built in. I know where it is and can locate in it in COM 3 and it connects, registers a signal, shows satellite locations, but refuses to ...
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1answer
219 views

Android Tablet KML/KMZ App for polygons w/offline & GPS capabilities?

I am looking for an Android app which allows me to view and query polygons stored in KML and/or KMZ with a GPS point representing my location and offline capabilities. My KMZ files are being output ...
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21 views

ODK Collect GPS Accuracy

Good day. Is it possible to require a minimum accuracy of the GPS widget? I know about accuracy threshold but what I need is to prevent forward swiping/finalization of the form if GPS accuracy is low. ...
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1answer
249 views

Finding Lost Samsung S4 with Lat/Long Coordinates

I lost my Verizon provider Samsung S4 phone while running on a narrow trail surrounded by brush. The phone no longer has power. Using Google Location History I obtained that Latitude and Longitude ...
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0answers
20 views

how do calculate nearest point in earth map with coords

I am having trouble calculating nearest point for another point with earth coordinates. I am particularly interested in calculating the intersection of linestring vector with earth coordinates. I'm ...
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0answers
14 views

Movement along a path with inaccurate location updates

Given a path and a vehicle traveling along that path. At intervals (~1 sec) the location and speed of the vehicle along that path is provided. The location of the vehicle is not accurate, a noise ...
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1answer
19 views

Map Positioning and Routing on Android

I have been instructed to create an small offline application in Android that have to: a) Use our own map in JPEG format as the basemap (Google Map / OpenStreet Map is not applicable) b) Show the ...
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1answer
759 views

GPS Coordinates to WKID 102100

I'm currently creating a project for ios and I'm using the latest ArcGIS IOS api. I have a mapView that is using the spatial reference skid 102100 and i am receiving lat long coordinates from an ...
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1answer
22 views

Getting started with RTK base stations

My employers are looking into a partnership with a company that provides RTK base stations (they specialize in Topcon equipment) and are planning to replace our old total station with a Topcon HiPer ...
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2answers
41 views

iPad with real GPS

Historically, iPads have not had true GPS. The GPS they have goes through a cell phone network, called Assisted GPS. Now I hear that iPads are coming with true GPS. How do I know if a particular iPad ...
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1answer
223 views

downloading waypoints from Garmin GPSmap 60cx to QGIS2.2. Am I missing a step?

QGIS2.2 64 on W7 64 is failing to download waypoints from Garmin GPSMap 60cx USB port. GPSBabel installed and the GPS Tools dialog is OK: GPS device: “Garmin serial”, Port: ”USB”, Feature type ...
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1answer
32 views

How to decode GPS coordinates from Android device XML file?

I’d like to decode the location coordinates from the XML file from my Android phone (SGS2). Any solution how to do it, how to convert them to usable coordinates (longitude/latitude)? Looks like it's ...
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1answer
167 views

iPhone app to record 3D location information

Does anyone know of an app that would run on an iPhone or iTouch that would record the X,Y and Z information from an external GPS? I am using a Dual XGPS150 Bluetooth receiver. The GPS will record ...
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2answers
52 views

How to extract NMEA outputs from an external bluetooth GPS to an Android device

I am requested to create an Android app that have to connect to an external Bluetooth GPS and read the NMEA output and visualize the location on ad digital map. I am a new comer in this aspect. ...
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1answer
179 views

Converting GPS cords to X Y based on wrapper

I'm trying to create some software for an airport and they require me to place icons of aircraft in their position based on GPS. I have 10x10 tiles each tile being 256x256 pixels and the origin point ...
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2answers
58 views

How to import GPS waypoint, track info into ArcMap 10.2?

I heard that ArcMap 10.2 can import waypoint and track information directly from a GPS without bridging it from MapSource or BaseCamp software. Can someone give me tutorial or link to a video that I ...
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0answers
16 views

Regarding processing of GNSS data heights

I have a TRIMBLE GPS receiver and in its data, I am able to derive the ECEF xyz coordinates. My objective is to obtain the orthometric heights, which I could do using the equation h = H + N. My ...
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1answer
44 views

Is this distribution of GPS positions caused by multipath distortion?

I have some GPS points that are close to where they should be, but not nearly close enough (horizontal precision is around 10 meters). Looking at the positions which comprise these points (there are ...
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2answers
46 views

How do some companies receive GPS data from vehicles if GPS's can't send any data?

I know that some companies offer tracking services for vehicles such as live GPS tracking they can access any time, but as you can't use the GPS protocol to send any data i wonder how the do it... I ...
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1answer
211 views

Trimble Net R9 Base Station Receiver File Structure

We just installed our new GPS Base Station Net R9 receiver that replaced our old 5700 receiver. The old 5700 used Trimble's GPS Base software, which the new Net R9 does not. My first problem that I ...
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1answer
57 views

Field Equipment: Geneq SXBlue II with iPad and ArcGIS Collector app

My company just recently purchased a Geneq SXBlue II GNSS receiver to be pair with an iPad and the Collector for ArcGIS app. I have heard great things about the submeter accuracy of the unit; ...
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0answers
16 views

road network construction using latitude longitude and timestamp

I have gps data(latitude,longitude and timestamp) of a city over a month I want to use some routing algorithms on that data so need to construct road network or graph So how to construct road network ...
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1answer
152 views

Automatically panning the map in ArcGIS when using the Time slider

I have a point dataset with time-stamps at 1 minute intervals showing a driving route. I have enabled the Time properties of the layer and I am able to use the Time slider to see the points move ...
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1answer
49 views

How to change ODK GPS accuracy threshold?

I am using ODK with ONA in XLSForm. As the GPS accuracy default is 5 meters, it automatically accepts it when it reaches 5 meter. Is it possible to change the default accuracy to less than 5 meters ...
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0answers
124 views

Can't find GPS in QGIS for Android

I have installed QGIS on my samsung galaxy note 10.1 (not 2014 edition) but I can't get contact with the GPS. I have the GPS information tool, but when I try to connect, QGIS shut down or nothing ...
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0answers
9 views

M-field to a point layer calibration (Linear Reference)

I am working with routes with ArcGis 10.1 and I'm trying to calibrate the routes using a points layer imported from text file obtained from a GPS. But the points layer doesn't have m-field to be ...
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0answers
20 views

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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0answers
33 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
103 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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0answers
43 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
42 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
48 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
675 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
24 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
3k 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
221 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
87 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
76 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
64 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
51 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 ...
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1answer
34 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 ...