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

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Cheaper solution for uploading maps to GPS (forestry maps: roads, trails, hydro, polygons)?

I'm using a QGIS 2.2.0 Valmiera on a Windows 8.1 system Desktop. I'm a forester and I would like to have a cheap solution to load maps into the handheld Garmin 60, 62 or 64 series GPS. Free would be ...
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2answers
2k views

GPS units compatible with Galileo

It seems like after lots of initial problems Galileo project is taking off (ESA, BBC). I was wondering what the state of preparation for that is on hardware side. Are there any consumer grade GPS ...
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2answers
21k views

Differences between triangulation and trilateration?

Looking around I noticed that many people interchange the terms (triangulation and trilateration) for the same sense. What is the correct sense of Triangulation and what are the differences from ...
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1answer
69 views

Conversion of (lat, lon, height) from GPS to another CRS

I have latitudes, longitudes and ellipsoidal heights derived from GPS readings, referenced to the ITRF08 system with vertical datum (CGVD2013) - http://webapp.geod.nrcan.gc.ca/geod/hmod/hmod.php How ...
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2answers
3k views

PostGIS convert geography(Point,4326) to GPS

I got a database with a column of type geography(Point,4326), the data contained looks like 0101000020E610000092E057F66EF73140930035B56CBD4840. How can I convert it to GPS coordinates?
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1answer
144 views

Yandex Navigator / Maps - Determining user location

Kindly redirect me to a more appropriate forum in case there exists one. I am an active user of Yandex.Navigator App (available for all kind of mobile platforms). Whenever I open the App, even though ...
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2answers
196 views

Map-matching GPS points to the road network!

I am quite a newbie in Postgres and Postgis so please be simple and clear :) I am trying to do a simple map-matching (or path-inference if you wish) of some GPS points. I am using postgres(postgis). ...
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2answers
82 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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0answers
241 views

Can I put a button that automatically inputs GPS coordinates into a google form? (or other spreadsheet populator)

I am currently creating a Google Form and part of the questionnaire requires the user's current GPS location. Is it possible for a button to be able to do this and automatically populate the field? Or ...
2
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1answer
204 views

Computing the elevation angle of a GPS satellite with respect to the given receiver location

can anyone source an explicit formula for calculating the elevation angle for a GPS satellite as seen from a receiver. I can't seem to find one. Even a text reference would be great. I couldn't quite ...
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1answer
30 views

Base station correction process

This concerns post-processing via base station correction in Pathfinder Office. I understand the base station is a known location and the GPS receiver's location is corrected relative to the base. I'm ...
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1answer
40 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 ...
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0answers
26 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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2answers
61 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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0answers
27 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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1answer
129 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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1answer
766 views

How to show a geoTiff on an iOS application?

I'm developing an iOS application that will use offline maps. These maps are on GeoTiff format but I don't know how to do it. I've found this question: How to display a GeoTIFF on mapView but it uses ...
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0answers
41 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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0answers
42 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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1answer
162 views

Taxi fleet simulation - MATSim a useful tool?

I am working on a university project and I would really appreciate some advice: My project consists in modeling the taxi fleet of a major city and investigating if replacing a percentage of the fleet ...
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0answers
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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0answers
76 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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0answers
13 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
97 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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1answer
51 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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5answers
2k views

How to build a geographic database of GPS logs?

On our aerial wildlife surveys we typically generate dozens of GPX files, and usually convert most of them into shapefiles for display in a GIS application. GPX files are a terrific way of keeping all ...
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1answer
82 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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0answers
45 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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0answers
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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0answers
13 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
73 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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4answers
24k views

What is the maximum Theoretical accuracy of GPS?

I was talking with a potential client, and they requested that we plot some points with GPS, with a maximum (or should that be minimum?) accuracy of 2 m. This is an area with no WAAS, and I was under ...
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49 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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4answers
5k views

Can *.ssf files from Trimble GPS be imported as features to display in ArcMap?

I have not come across *.ssf files before but I believe they are a Trimble GPS binary format. Someone has asked me if these files which he thinks have line/poly features can be imported for display ...
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1answer
83 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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0answers
74 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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0answers
36 views

Software to determine if a position is within a shape

I would like to know if there is software available that can: Given a position detected by GPS, Warn the user if they are within a shape that I created and put into a database. Any computer ...
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0answers
37 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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0answers
29 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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61 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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0answers
69 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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2answers
485 views

Android API - how get the car position (fixed to the road)?

All the android.location classes receives best REAL position of the GPS. Is that any way to get from Google navigation API the CAR position x,y - fixed (tighten, interpolated) to the closest road on ...
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105 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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46 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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0answers
41 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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0answers
37 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
100 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
75 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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1answer
83 views

How does a GPS unit ensure it has the same time reference as a GPS satellite?

I've been reading about GPS to find how it works, but one thing still bothers me. To calculate distance from GPS unit/receiver to GPS satellite, it uses the difference between radio signal sending ...
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1answer
81 views

Developing an iOS GPS App

I'm an experienced programmer looking to develop a GPS App with these constraints: I Need a turn by turn level of precision I Need to know if a street is one way or not I Want to calculate an ...