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

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27
votes
6answers
7k views

Creating polyline-based “heatmap” from GPS tracks?

This winter I am planning to track my downhill skiing/snowboarding using a GPS. Most of my riding will occur at the same resort. I would like to be able to create a sort of "heatmap" that shows the ...
1
vote
1answer
47 views

How do I file a QGIS bug report through alternative means?

I have tried to file a bug report per the instructions on the QGIS get involved page. Signed up for an osgeo account, but keep on getting kicked off. It could be my connection (Wireless DSL, wildly ...
1
vote
0answers
21 views

Will GPS L2 make RTK more reliable?

I currently experiment with an affordable L1 GPS RTK system based on u-blox NEO-M8T with RTKLIB and higher quality patch antenna (with ground plane). I wonder what is the role of L2 signal in an RTK ...
1
vote
1answer
29 views

Attribute table Does Not Show Any Lat Long Field in ArcGIS for Desktop?

I had import shapefiles data which is a point features from GPS receiver. The points are well on pointed on the ArcGIS display, but when I open each attributes table, there is no field show the ...
1
vote
1answer
174 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 ...
0
votes
1answer
14 views

Issue with a Leica RX1200

Just got handed a Leica RX1200 unit (which I'm not familiar with). When I turn it on it opens up the window/select program screen and almost immediately switches to a perpetual hourglass icon. We'...
0
votes
0answers
27 views

Looking for a web service to return landcover/landuse data based on Long/Lat

I am looking for an web based API to get location data based on Latitude and Longitude that will return landcover/landuse feature data for a mobile app. It will preferably return the data in a json ...
4
votes
3answers
149 views

How to evaluate performance of GPS/GNSS unit

I need to integrate some sort of satellite-based positioning for a mobile robot project. I am at the very beginning - I got 2 u-blox GNSS evaluation boards (these NEO-M8Ts) - I chose an integrated ...
0
votes
0answers
35 views

Working out meter accuracy based on number of visible GPS satellites?

I am working with NMEA data and I curious whether there it is possible to calculate the accuracy, in metres, based on the number of visible satellites or whether there is an alternative way? The two ...
16
votes
15answers
7k 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 ...
0
votes
0answers
25 views

How does distanceTo use accuracy in android.location.Location

I would like to know how exactly accuracy will be used in getting to know the distance with the build in function distanceTo(Location location). I have read everything in https://developer.android.com/...
2
votes
1answer
221 views

Is there an industry-standard official mapping of Galileo satellites to global "PRN”/ID values?

In the U.S. GPS system, satellites are identified by the PRN number broadcast by each satellite. This ID is usually visible on most GPS receiver platforms that provide access to individual GPS ...
3
votes
3answers
312 views

What is a good, small GPS data logger that stores accuracy information? [closed]

I'm looking for a small GPS data logger for geotagging photos, and I've had trouble finding one that meets my requirements: Small, key-fob size would be ideal. It should also store its tracks on on-...
39
votes
10answers
59k 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 ...
3
votes
1answer
90 views

Satellites needed to receive proper 1pps signal

So I have read that you need 4 satellites to be able to get a proper position from your GPS. But how many do you need if you are only interested in the 1pps signal from them? And what effects play a ...
1
vote
0answers
46 views

Twitter live feed on ArcGIS desktop [duplicate]

I am a complete beginner with ArcGIS and I have been looking for a way to live feed tweets to ArcGIS desktop. A quick google search brings this blogpost up from 2009: http://blogs.esri.com/esri/arcgis/...
0
votes
0answers
8 views

What is the standard method of finding satellite positions in between the 15 minute intervals in an SP3 file?

SP3 files provide satellite positions for every 15 minutes. How would you find the satellite position at a time between two logged positions, i.e. 7 minutes after the last logged position? I can ...
1
vote
0answers
29 views

writeOGR R and add an icon symbol [closed]

I am wondering if there is a way to add an icon symbol to the R code I am using to export data in GPX format. In the navigation program I import the GPX file into all of the of coordinates are ...
0
votes
2answers
33 views

Proper handling in PostgreSQL/PostGIS only after many queries?

I am trying to analyze GPS data of a parade on a fixed route with a certain variance due to the urban surrounding (canyoning). I'd like to project the GPS waypoints to the nearest points on the route ...
2
votes
0answers
11k views

Key difference between NAVIC Indian Regional Navigation Satellite System (IRNSS) and American Global Positioning System (GPS)? [closed]

What's the key difference between NAVIC The Indian Regional Navigation Satellite System (IRNSS) and American GPS system? Radio Frequency Accuracy guaranteed Modulation Area Covered Engineering ...
1
vote
1answer
53 views

Calculating length (in meters) of GPS track? ArcGIS 10.3.1

I'm trying to calculate the length of a GPS track in ArcGIS 10.3.1. What I've done so far is: Converted track using the "Points to Line" tool Opened attribute table Made new "Length" column Opened "...
2
votes
4answers
103 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 ...
1
vote
0answers
21 views

how to show gps laltitude/longitude in input in android application (webview)

i devellop an android application with , jiquery mobile 1.9, cordova 2.4 ....., i want to display the coordonnate of gps (lot,lat) in input like in the pictures,i'm tired with this code but it cant ...
1
vote
0answers
14 views

Adding sequential codes to GPS waypoints

When using a GPS (a Garmin GPSmap 62 -- but our team has other similar equipment), when I want to add a new waypoint, the system displays a default number for it (e.g. 202). If I add the 202, the next ...
0
votes
1answer
31 views

What is the difference $GPRMC and $GPRMCA?

What is the difference between $GPRMC and $GPRMCA strings? I can find online documentation about $GPRMC strings, however I have a device that sends $GPRMCA strings. $GPRMC,225446,A,4916.45,N,12311....
2
votes
1answer
2k views

GPS data validation

I was wondering if Fix quality data from GPGGA, can be substituted to Validity field in GPRMC? In my application I have to use only GPRMC, but I don't really know if it sets validity only if Fix ...
26
votes
3answers
38k views

What are the major differences between GPS, GLONASS and Galileo?

What are the major differences between GPS, GLONASS, COMPASS and Galileo?
6
votes
4answers
2k views

Matching GPS tracks

I'm looking for a proper way to process multiple GPS tracks (so time ordered list of lat/lon points) and match/classify that segments, that are covered by multiple tracks: So it's not about ...
2
votes
2answers
100 views

Quantitative vs Qualitative heatmap

I'm having a debate with a colleague of mine over whether generated heat maps are quantitative or qualitative in nature. The underlying data source is GPS points. The GPS devices that we use are ...
3
votes
0answers
280 views

Using R to map matching GPS data? [closed]

I have many vehicles GPS data points, which consist of "timestamp, longitude, latitude, fuel consumption and distance" and the data is OSM(open street map) based. I want to match the data points to ...
1
vote
0answers
33 views

Open layers 3, map.on('moveend',..): Differentiate between user interaction and map.setCenter() calling

I am implementing OL for a GIS application and want to add a 20 seconds timeout when the user scrolled the map, after which the GPS auto track function should resume. For that I am utilizing the map....
7
votes
3answers
28k views

How to make work tablet integrated GNSS (GPS) on Windows 8 with QGIS?

I have tablet - Dell latitude 10, running Windows 8, with integrated Broadcom GNSS Receiver BCM47511 (GPS,Glonass...). Because it is integrated GPS and Windows 8, there is the "new" way of providing ...
1
vote
1answer
183 views

Calculating radius of curvature and banking angle when set of lat, long and elevation are given?

I have set of lat,long and elevation values with me. Can you help me find the Radius of curve and banking angle. Formulae may be provided as an answer.
6
votes
5answers
2k views

How can I get my GPS track data into a graphics program?

I'm using a Garmin Edge 705 bike GPS/computer unit, which produces .gpx files. I can use the standard software it comes with to plot on Google Maps etc, but I'd like to be able to output just a vector ...
1
vote
1answer
44 views

What are some automated techniques for cleaning bad data from a GPS track log?

I have been having some problems with "bad trackpoints" in the track logs I've been creating, especially in bad signal conditions. In some cases these obviously jump miles away from the true location;...
2
votes
0answers
42 views

Trimble Access vs. TerraFlex: Which is simpler for creating data entry forms? [closed]

I am working on an archaeological project and need to create forms for users in the field to use and take photos. I am renting a Trimble GNSS unit and can get Trimble Access for free with the unit, or ...
8
votes
3answers
2k views

Seeking GPS device for vehicle tracking?

I am a programmer with no connection to Geographic information, except that I work on application which uses Google Maps. I need some device, which I will be able to set in a vehicle in order to keep ...
0
votes
0answers
49 views

Panasonic toughbook FZ-G1 gps troubleshooting

Not long ago, I purchased the "optional" GPS module for my FZ-G1 toughbook hoping that it would be an easy install. It may be that the GPS module came defective or there are more subtle steps to the ...
26
votes
7answers
3k views

Why don't they use cell towers like GPS satellites?

If my understanding is correct, a GPS satellite produces a pretty simple signal which is basically composed of its location and its time. Given 4 of these signals, then one can uniquely solve for the ...
13
votes
3answers
7k views

Advanced android app for mapping and GPS logging?

I am looking for an android app able to log GPS data like coordinates, altitude, current speed and would be nice if also the GPS accuracy/number of satellites. Many GPS apps are able to display these ...
2
votes
1answer
34 views

How can I match Geolife traces using TrackMatching or similar tools?

I am working on route prediction and I decide to use realistic trace of moving object, I have choose geolife dataset it is composed of 278 users and every user has its trips presented in GPS or GPX I ...
0
votes
0answers
19 views

Manually reducing the number of available satellites per epoch in a RINEX observation file

As part of my research I will need to test some GNSS positioning algorithms using only four satellites. To ensure this I've edited a RINEX observation file manually and for every epoch I have only ...
0
votes
1answer
19 views

Trying to find the manual for a Sokkia GIR1000

I'm trying to track down a manual for a Sokkia GIR1000. My department has one but over the years the manual seems to have disappeared. Does anyone have one or know where I can get one?
1
vote
1answer
36 views

How to determine the closest feature to my points?

I am doing a research on transportation for motorcycles. For each trips, I have the origin points and the final destination coordinate points. I also have another landuse layer with my points of ...
0
votes
1answer
2k views

How does a GPS/GSM/GPRS Tracker work without a monthly fee?

GPS newbie here. Looking at this product: http://dx.com/p/gps-gsm-gprs-tracker-for-personal-remote-positioning-29284 How does a GPS tracker work without a monthly plan?
3
votes
0answers
95 views

GPS points displaying in the wrong place [closed]

I'm trying to help a student by importing an excel table of Lats and Longs into Arcmap, but they are displaying in the wrong location - I am also a bit suspicious of the coordinates. I imported the ...
1
vote
1answer
670 views

How to extract GPS information from Garmin Cam 20 video files

I just got a Garmin Dash Cam 20 and recorded some videos with it, and also confirmed that Garmins own player can show the GPS information on a Map. I cant seem to find any technical information on ...
3
votes
0answers
48 views

Uploading Shapefiles to Garmin?

I am trying to upload shapefile polygons onto my Garmin 60Cx GPS. I use the Trace tool and load shapefiles via Minnesota DNR's application. There are almost always gaps in the shapefile on the GPS, ...