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

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Recommended GIS/GLONASS chip?

As a cyclist, I ust satnav extensively, whether for riding around the city or travelling. My Galaxy Nexus smartphone isn't very good at GPS, while my GPS+GLONASS-equiped Nexus 7 tablet (second model, ...
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16 views

How to fit gps trackings to a line with a known heading?

I have gps trackings that I know they fall into a certain pattern - a line with a known heading. How do I find the line that minimizes the distances of the points from it but is in the correct ...
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1answer
17 views

GPS points of a vehicle snapped to a specific polyline path [duplicate]

So I have been capturing bus GPS locations for a while now, and I am became interested in snapping them to their corresponding polyline (route). While at first this seemed like an easy enough task I ...
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29 views

What is the best data collector for invasive species? [on hold]

I have been assigned to map out a couple acres of natural area. However I don't know what kind of devise I should use to collect the data and import them into the arc map.
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26 views

match noisy GPS data to closest linestring in road network [duplicate]

I have some noisy GPS data(Points) that they are not exactly on the road because of the noise. But I want to match them to the closest road linestrings. How to do this in PostgreSQL? Data: ...
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19 views

Are there methods of filtering gps-data with metadata?

In our project we captured GPS-tracks from subjects in the timeframe of a year. In total we captured around 13000000 GPS-points this way. The captured data comes from an electric powered car and is ...
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24 views

How to create displacement vectors in QGIS using GPS points with different dates?

Is there a way to calculate and visualize displacement vectors in QGIS ? I have DGPS points taken at the same place (ground control points), but their position moved over time as they are located on a ...
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19 views

How to map locations to the nearest road

I have say 10 positions (lat and long).These locations will be off the road. How can I map/project these locations to the nearest road using MATLAB.
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2answers
58 views

What mathematical processes does a GPS receiver use to determine position?

I'm writing a report on the mathematics of GPS, but I'm wondering what methods the GPS actually uses. What I've done is set up the four sphere equations and solve them using the Newton-Raphson method ...
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1answer
59 views

How to locate property corners using plat map description?

I am interested in a piece of property for which I have a plat map description, giving what seem to be latitudes/longitudes of lines along the boundaries (not sure about this). The objective is to ...
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27 views

How to use NewSQL Database with GPS tool with Node.JS as server side programming

I am a web project manager and I want to create a website to show current position of cars on the map (google or ARC). I know how to create the website, but I don't know how to fetch the longitudes ...
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51 views

Do countries have a Latitude and Longitude range?

Do countries have a Latitude and Longitude range?. Is it possible to get the latitude and longitude range or boundary for each country. UK lat and long is 51.5000° N, 0.1167° W. What is the ...
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33 views

Make a line from a set of GPS points close to a specific GPS point with PostGIS

I have to develop a map-matching algorithm. At the moment I only match GPS points with the closest road segment. I'm looking for a way to compare the directions between a GPS point and a road to ...
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27 views

Calculating the distance between a set of UTM coordinates [duplicate]

I would like to calculate the distance between several GPS points, these data are projected into UTM Zone 30. I am using Postgresql 9.3 but I am happy to see results with any software or website such ...
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12 views

How do I get a return value when calling GPSBabel from C#

I have some C# code that calls a GPSBabel command line to convert a NMEA file to a GPX file. The code works and the conversion happens. The problem is, how do I get a return value indicating success ...
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1answer
33 views

Trimble Pathfinder Differential Correction: ‘Uncorrected’ for block of GPS data

I’ve been collecting GPS point data without problems over the last few months. Recently, on two dates, after using Pathfinder differential correction, the exported records’ Corr_Type changed from ...
2
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1answer
86 views

Get vertice information and apply to line segments using ArcGIS for Desktop (or QGIS)?

I've recently started tracking bike treks using Strava and I thought it would be interesting to do some analysis on my treks. I am able to import the GPX file into ArcMap and convert it to a point ...
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44 views

Understanding Latitude Jumps

I'm decoding some AIS messages and outputting KML files showing routes. Looking at some ships in the Adriatic Sea there are some weird Latitude jumps that I don't understand. Several ships show ...
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1answer
42 views

Is it better to take the elevation of a GPS unit or that of a Digital Elevation Model?

When searching of gps routes in wikiloc, for the trailrunning race "Transvulcania" I have several routes to look. I downloaded a lot, but every route has a distance between 71 kilometers and 74 ...
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12 views

Speed Dilution Measurement

I would like to verify the accuracy of the speed measurements from GPS. I know that normally vDops, hDops, and pDops or even accuracy read from the GPS are the sources for checking the accuracy. ...
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1answer
69 views

GPS data -tracking analyst

i have GPS data from 15 trucks for one month. The data include (location x-y, speed, altitude and vehicle_id). I have used tracking analyst to visualize the data but i need to group them by day to ...
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39 views

Is it possible to find Lat,Long coordinates of points within a polygon whose GPS coordinates is known [duplicate]

I have a set of gps coordinates which make up a polygon. Is it possible to find Latitude,Longitude coordinates of points within this polygon using GPS coordinates of the polygon I already possess. ...
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34 views

suggest me some good online coordinates converter for GPS NMEA data!

I want to check my GPS conversions from NMEA format to decimal degrees and vice versa. Can anyone suggest to me some online GPS converters for quick reference where I will get entire conversions by ...
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1answer
63 views

How to convert negative NMEA latitude and longitude values ('S' and 'W')?

I'm getting from GPS data in the form of NMEA. There I'm getting positive latitude and longitude values('N' and 'E'). How do I convert the negative latitude and longitude values('S' and 'W') into ...
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70 views

Using GPS to field walk through a LiDAR scene

I am doing field surveying for archaeology using Lidar. If I attached a USB GPS to my laptop would it be possible to track where I am "in real time" on the Lidar as I am field walking? I'm wanting to ...
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22 views

Interpolating a set of GPS points on ellipsoid earth model

I have a set of GPS (latitude, longitude) co-ordinates along with the time at which the coordinates were collected. Additionally, I have the speed and the heading of the vehicle at those coordinates. ...
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24 views

How to calculate the covariance matrix of an RTK GPS system?

I am currently working to integrate an RTK GPS system into a sensor fusion framework. The framework is based on an Extended Kalman Filter, which is why I need an accurate estimate of the measurement ...
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49 views

Length of a long distance GPS track

I have a list of GPS points logged by a vehicle and I'd like to find out the length of the logged route. The problem is that the vehicle logs only every 10 minutes, so I don't have too many points to ...
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51 views

Creating custom maps for Garmin Oregon 600

I have a Garmin Oregon 600 GPS receiver and a map I made in QGIS. Where can I find a step-by-step guide to getting this map onto my GPS unit? A static JPEG or PNG map is fine since I'm not interested ...
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73 views

GPS tracking data string format for GRTQ device

I get GPS data from tcp (php socket), but for some devices (GRTQ) I will get an unreadable string. First devices sends: ...
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44 views

analysis of GPS measurements

I would like to design something like a filter to reject the GPS measurements with low precision. I know that calculating the distance and acceleration by the given velocity and coordinates might be ...
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38 views

Historical Traffic Condition + Vehicle Path Advise Required

I'm currently working on a project which involves tracing the path(GPS coordinates) taken by a vehicle (1) and measuring the traffic conditions(is it jammed and whats the speed during the time the ...
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35 views

Finding gps projection of 3d photo?

I have an aerial photo from Paris and I would like to plot gps paths and 3d surfaces on top of it (using R, python, etc). . The problem I have is converting my gps coordinates to 2d coordinates on ...
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1answer
84 views

Calculating speed along point feature class (.gpx) in ArcMap?

I have imported a .gpx file into ArcMap as a point feature class. Each feature has a Point z as well as a DateTime. I want to create a graph that shows speed as a function of distance. How do I do ...
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1answer
63 views

Trouble Converting from a shp. to gpx file and up loading to GPS

Currently I have a series of random points within a shapefile that I would like to upload to my GPS. Every time I try to upload the points via "Save file" it come up with an error message (posted ...
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1answer
44 views

Has anyone been able to install a GPS device 'Explorist Magellan 210' (Old, may be 2005) on windows 8?

Windows is unable to reckognize my device. It's 10 years old but fully functionnal. I would at least make it work as an external disk. All suggestions are welcome.
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56 views

Windows desktop application that allows to visualize, edit, download, upload and convert GPX files?

I am looking for a simple application that will allow me to visualize GPX data, edit and create new GPX tracks, areas and points and download/upload GPX data to and from devices. This application ...
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98 views

Good GPS navigation app for iPhone with downloadable OFFLINE maps?

I am looking for a good GPS navigation app for my iPhone that will work away from wifi and cell coverage (GPS only) and thus allow me to download offline maps. Paid app is OK. Must Have features: ...
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39 views

Is it possible to use GPS navigation with track up in QGIS 2.8

Can we have a rotating map while navigating with a GPS so our track is always pointing up? Just like a car GPS
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1answer
88 views

GNSS planning online vs trimble planning 2.9 software

Why using the same parameters GNSS planning on-line and Planning 2.9 Trimble show me different Dilution of precision (DOP on the graph)?! Which program is better mission planning solution for GNSS ...
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2answers
134 views

Measure my Cats movements , Accuracy of Mobile phone GPS at metre scale . how to improve it

I wanted to get some information related to an idea I have I have a lot of cats and a big garden. The cats generally roam through the garden and this location is fixed and Known If i have known ...
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1answer
74 views

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

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 ...
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13 views

itinerary import on GPS application (iOS)

I'm looking for an iOS application that could import an itinerary from a gpx of itn file (or whatever if itinerary is as easy as with google maps). I don't want just locate myself compared to my ...
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24 views

Playing multiple gx:track in Google Earth

I would like to be able to play multiple gx:track in google earth. I can play a single gx:track using the time animation but now I want to add multiple gx:tracks For example - GPS data from two ...
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9 views

not able to convert new GPS coordinates using feet [duplicate]

My known latitude is 46 deg 59' 9.6" What would my new latitude be 165 feet north of the known latitude?
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1answer
49 views

GPX-Tracks are not displayed correctly by many applications/web applications

I have a problem regarding GPX tracks that were created from Shapefiles using QGIS. The shapefiles were created by selecting all parts of a route from a PostGIS database. The polylines were merged ...
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1answer
116 views

Accuracy of GPS and HDOP

Given a handheld GPS with an accuracy of roughly 2 meters (verified through field tests) and an observation with an HDOP of 1.2, the accuracy of that one observation should be within 2 meters X 1.2 of ...
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27 views

Discrepancy between importing same data from CSV and GPS [closed]

I have been importing similar data by using two different methods: Entering the coordinates manually in excel and save as CSV, then importing in QGIS through delimited text layer. Column A is name, ...
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77 views

How to display tracks on a layer with lat and long in Openlayers

I want to show a track on my map. I tried the below code but the problem is I don't want to load the track points in the layer from the GPX File (because I don't want to generate a file from ...
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1answer
110 views

import GPGGA data to google earth

I have collected some GPGGA data in *.GPS file. Now how to import these GPGGA into Google Earth Pro.I want to see the result(lat, longt and height) in map. The file is opened like that: ...