Global Positioning System (GPS)
7
votes
1answer
140 views
Analysis of GPS error
I'm wondering if there have been any studies which attempt to analyze or characterize GPS error distribution over different situations/conditions (e.g. surrounded by tall buildings/mountains, ...
7
votes
2answers
110 views
Recommended driverless GPS loggers?
There are a bunch GPS loggers out there, but a good portion need software to download the data onto a computer. Some of the software is Windows-only, but others are Mac-compatible (what I need). ...
6
votes
4answers
579 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 ...
6
votes
2answers
636 views
Accessing GPS data with JavaScript in real time
Is it possible to access GPS data in real time on a smartphone with JavaScript (without an android or ios application I mean)?
Thanks
6
votes
2answers
719 views
What algorithm should I use to remove outliers in trace data?
I have GPX traces and want to remove outlying observations. There are some routepoints that are impossible because it would require acceleration that the vehicle can not achieve. Are there good ...
6
votes
3answers
2k views
Calculate maximum speed from GPS data
I have raw GPS locations for a track, and need to get maximum speed. Simple methods (calculate speed between 2 points, take max) will give meaningless large numbers due to GPS inaccuracy, the point is ...
6
votes
1answer
682 views
How to filter wrong GPS readings?
I have absolutely no experience with GIS, it just so happens that one of the hobby projects I am doing at the local hackerspace includes tracking a model boat with a GPS... I hope this is the right ...
6
votes
2answers
337 views
Managing error with GPS routes (theoretical framework?)
I'm looking for the appropriate theoretical framework or speciality to help me deal with understanding how to deal with the errors that the GPS system has - especially when dealing with routes.
...
6
votes
4answers
638 views
How to filter wrong GPS points?
I have a database of GPS points. There aren't any tracks, only points. I need to calculate some value for every 100 meters, but sometimes GPS gave a wrong coordinates that lies far from real GPS ...
6
votes
2answers
124 views
How to improve positioning of images taken with GPS and Gyro info?
I'm sort of 'recreating' google street view with MIT right now.
We have a car with a camera on top and we're driving at 10mph down a road. As we drive we're shooting pictures at 30fps and each photo ...
6
votes
3answers
324 views
GPS integration with multiple waypoint routes
I'm building a system that needs to get the output of a route optimizer into the hands of a driver who intends to make deliveries on that route. Whilst I can supply this to the driver as a printed ...
6
votes
1answer
94 views
GIS Server for web service
I am building an app that has some GIS requirements that go a little beyond (I think) what I can retrieve from existing online web services resources so I am attempting to build a server of my own to ...
6
votes
2answers
773 views
Trimble GeoXH vs GeoXT and GPS Correct
I am about to purchase a new GPS unit. I currently have a GeoXT and have used the combo of GPS Correct/ArcPad with GPS Analyst/ArcMap to correct the collected data to submeter (or close to it).
...
5
votes
3answers
319 views
Register and display real time tracking of my smartphone (gps) on a map
I have 2 smartphones (android galaxy and iphone) and i would like to display the position, according to the gps coordinates, on a map.
Is there any app to download or any kind of service where i ...
5
votes
4answers
460 views
Looking for software to interface GPS data with PC
I have GPS Unit from Garmin (GPS 18xPC).
I'm looking for software I can install on my PC that will allow me to interface with the data I collect on my GPS unit.
Any help will be great
5
votes
3answers
410 views
Garmin etrex raster maps support
I currently use an excellent set of printed topographic route maps for mountain biking. I would like to scan the maps, georeference them, and upload the maps to a handheld GPS device.
Does the etrex ...
5
votes
3answers
124 views
How to transform GPX-tracks into elevation-tracks with any GIS?
I have a GPS track in GPX format available from a recent bike tour and I need and want to do some analysis on the tracks. I'm wondering whether there is any way to transform the GPX data into an ...
5
votes
3answers
2k views
Free MobileGIS like ArcPAD
I'm looking for open-source program like ArcPAD.
I have read all questions and answers, but i find nothing. I need the program for PDA (Dell axim x51v + GPS modul) and I want mapping points (trees or ...
5
votes
3answers
72 views
Can I access Trimble logged positions in ArcMap10?
We recently walked a fence perimeter with a Trimble Ranger, auto-logging positions at 5 second intervals in a generic point file. The exported file acknowledges over 800 points, but only displays the ...
5
votes
4answers
107 views
Is there a way to identify and remove similar GPS tracks in PostGIS or ArcGIS?
I have a large number of GPS tracks from a number of different users. I'd like to identify tracks that take the same route and remove those duplicates. For example, a user takes the same streets from ...
5
votes
2answers
179 views
Storing GPS tracks with timestamps in PostGIS
I need to store a series of GPS points with timestamps in the database (traces of various vehicles).
I am wondering which of two approaches to choose for storing them in the PostGIS table:
1.) Each ...
5
votes
1answer
205 views
Why are points collected with a Trimble FM 750 off by more than a mile when displayed in QGIS?
I have a grower that has a FM 750 and is trying to make points in a field. When finished he takes the file out of the display and goes to his computer and he can bring up the points in the right ...
5
votes
1answer
154 views
Simulate (Mock) GPS Tracks
I have the following scenario:
1) I need to create GPX files for use in testing of a mobile device.
2) The tracks to be described within will span large distances over long time periods (i.e. it's ...
5
votes
2answers
341 views
How to merge multiple file geodatabases into one file geodatabase?
I have created a file geodatabase that has several feature data sets, feature classes, and domains. I have created a map with the file geodatabase added to it, converted the map to ARCPAD AXF format ...
5
votes
2answers
511 views
Garmin etrex 10 and QGIS
I want to know if anyone has been able to download data from a etrex 10/20/30 directly from Qgis. The usb protocol decsribe in a recent post does not do the trick. GpsBabel documentation
states that
...
5
votes
1answer
269 views
PLT track in PostGIS
What are the best practices for importing and aggregating tracks (in my case in 'plt' format) in a PostGIS table, grouped by user. Are there any tools/db models/tutorials available?
5
votes
1answer
574 views
Calculating absolute precision confidence number from Dilution of Precision indicators from GPS receiver
End-user GPS receivers typically show an absolute confidence indication, such as Within 25 Metres, for the calculated position.
I am parsing NMEA data from a GPS unit and wan't to calculate a similar ...
5
votes
1answer
190 views
Differentially correct GPX file
Is there any way to differentially correct a GPX file using free or open-source tools? Does a GPX file contain the necessary information for differential correction (I can put the timestamp in it ...
5
votes
1answer
288 views
Cleaning GPS track data
I have data captured with a GPS tracking unit. Some track have bad/cold starts and the only way to determine the track quality is by using the altitude. Unfortunately I don't have the raw GPS data and ...
5
votes
2answers
2k views
postprocessing GPS coordinates with RINEX data to improve precision?
Im doing some mapping for OSM in my region and I am curious if the precision of tracks from a GPS Receiver can be improved if they are post processed with RINEX data.
The tracking is done with a ...
4
votes
3answers
1k views
What is the easiest way to measure a polyline using either QGIS or ArcGIS
I've collected a bunch of GPS polylines (WGS84). What is the easiest way to measure the length of these lines in KM?
4
votes
3answers
250 views
Tracking a vehicle without GPS device
We are planning to write an application which have to track the user driving in his truck in the cities like New York city accurate upto which lane he was driving on. In the cities with those tall ...
4
votes
3answers
257 views
Differentiating a building from a road on a map?
This question was originally asked here by Steven and I felt the question was better asked here.
Steven would also like to know the sources Google buys it maps from. I remember seeing a post about it ...
4
votes
5answers
279 views
How do I find software for my GPS?
I recently unearthed a GPS unit I purchased a few years. It's a Garmin GPSmap 60 (picture) and has a usb port on it. Is there a way that I can link it to my mac? I do have windows installed also, and ...
4
votes
3answers
623 views
Mobile, Offline viewer for geographic data
Currently, field crews consumer geographic data via laptop (no internet, no gps). ArcReader.
I would like to get them shapefiles (or some derivative of a shapefile) on a mobile platform (smartphone) ...
4
votes
4answers
2k views
Connecting GPS to ArcGIS via USB
Is there a way to connect a GPS to ArcGIS via USB? At the moment the GPS extension only appears to support comm port connections. It would be good to know if a USB connection can be made, then perhaps ...
4
votes
3answers
183 views
Wildlife surveys using tablet and GPS, import/export to/from ArcMap
I've found some info about this on a previous post (Advanced android app for mapping and GPS logging), but it didn't provide enough info, I'm hoping some other tech experts can help!
I have a tablet ...
4
votes
3answers
433 views
GPS Datalogger with USB Interface and GPX Output
I'm looking for a reliable, robust and reasonably priced GPS datalogger, to measure time, distance on tracks. The logger should be reasonably priced but ready for outdoor activities. Mud, dirt, a ...
4
votes
3answers
1k views
GPS post processing - Differential Correction
I have a large set of collected GPS points that I'm pulling into Arcgis from SQL and creating an xy event layer to then map them. The fields for the points are as follows: recorded, lat, long, ...
4
votes
1answer
3k views
How to batch convert Garmin GDB to GPX?
I need to convert a lot of garmin GDB files to GPX in order to convert it to another vector format. Is there any tools available can do a batch convert from garmin GDB files to GPX? Using MapSource ...
4
votes
4answers
2k views
Using android phone to plot GPS points?
I was wondering if I could use my android phone (HTC Wildfire) to plot gps points and export these into GIS software (I have QGIS and MapInfo).
Thanks,
Alan
4
votes
3answers
195 views
API to suggest nearby streets
For an app I'm developing, I want to use the phone's GPS to locate it. I then want it to list streets that are nearby. The customer might be in his back garden for example, and this may be closer to ...
4
votes
1answer
2k views
How to calculate Bearing between two GPS points
The following returns 150 degrees using C# converted from JavaScript Bearing formulas, but Google earth returns 210 degrees for the same values.
The broken code is GetBearing() but I've also included ...
4
votes
1answer
200 views
RINEX specs and OS library
Is there any OS library to read/write/process RINEX data?
I've been wanting to start a OS library to read and write RINEX, which is something I need for a project, but not actually post-process them.
...
4
votes
1answer
731 views
Point interpolation in route
I have a set of GPS coords with X,Y and Course. I need to interpolate additional points based on the course of each point. It would be a simple line intersection based on lines drawn using the 2 ...
4
votes
2answers
1k views
Trimble GeoXH, XM, XT - Data logging without Terrasync or GPSCorrect?
Is it possible to capture data for post processing on a Trimble GeoXH, XT, or XM without using Terrasync or GPScorrect? Specifically I would like to create a RINEX file. A Trimble 4000 series receiver ...
4
votes
1answer
203 views
Proper work flow to move manholes and pipes to surveyed location
I would like to know how to accomplish the following task using QGIS.
I have an existing point shapefile representing sanitary sewer manholes and an existing polyline shapefile representing sanitary ...
4
votes
1answer
81 views
GPS Elephant Tracking II: Is ArcGIS basemap imagery orthorectified?
-- For my original question and pictures of elephants wearing GPS equipped anklets, go here. --
I'm experimenting with the use of GPS anklets to track the movement of zoo elephants. This has proved ...
4
votes
1answer
149 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 ...
4
votes
1answer
1k views
Distance calculation : Integrating incremental gps data
I am trying to build a GPS based odometer based on android.
Currently , I am calculating incremental distance changes very frequently ( < 5 meter movement). The distance calculation in android is ...
