Tagged Questions

Global Positioning System (GPS)

learn more… | top users | synonyms (1)

5
votes
1answer
67 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). ...
3
votes
1answer
175 views

How to export offsets from Trimble Rangefinder?

I already asked this question at http://www.rpls.com/forums/viewtopic/8/1276880, but didn't get any answer so far. Maybe here someone can help... I have a question about the use of Trimble Products. ...
3
votes
1answer
195 views

What is the DNSC08 Mean sea surface model ellipsoid based on?

Does anyone know what Danish Space centre DNSC08 mean sea surface model uses as the reference ellipsoid? there is no meta data on the web site: ...
0
votes
1answer
120 views

convert GPS to x,y using reference node

i am using sensor nodes and their antenna to calculate GPS coordinates as notation of (degrees/minutes/seconds), i have some question of how to do these things: how can i convert latitude and ...
0
votes
1answer
95 views

How to calculate surface area of highland region using DEM with ArcGIS (ArcEditor)?

Am shyaka from Rwanda. I use GIS tools and have all required data to perform or calculate surface area from the polygons that have been given by GPS (Trimble) with ArcPad 8. I originate from a high ...
3
votes
0answers
24 views

Ways to measure similarities/congruence of tracks (point features) in ArcGIS

I have a sets of GPS coordinates recorded while tracking different cross country runners. What I would like to do is to compare how similar the tracks of the individual runners are. Is there a test ...
3
votes
0answers
40 views

GPS data based track/trip calculation algorithm available?

Currently I'm receiving position data of moving assets every 90 or 120 seconds (depending on the asset). What I'd like to achieve now is to detect standstill and movement phases (tracks/trips) on the ...
3
votes
0answers
92 views

QGIS: GPS Tracking with improved Altitude

I am preparing for archeological fieldwork in Sudan. I recently came up with RTK equipment and software using RTKlib to export the real time corrected data (cm level) to QGIS via a simulated NMEA ...
2
votes
0answers
74 views

How to interpolate GPS data correctly?

I'm working on a project that involves using linear interpolation to fit lines to lat/lng points. I'm pretty new at scientific programming related stuff, and I was wondering if people could steer me ...
2
votes
0answers
100 views

calculating bounding box from known centre coordinate and zoom

I have a map, the centre of that map (centrepoint) is = -37,175 ( gps) I know the zoom of the map = 13 I know the size = 320x320px I know there is 111111m in a degree of latitude and a varying degree ...
2
votes
0answers
47 views

How can a GPS receiver know the estimated error?

I would like to plot a circle of possible error on the map in a GPS app. From http://en.wikipedia.org/wiki/Dilution_of_precision_(GPS), we can see that GDOP is equal to "delta of output location" ...
2
votes
0answers
55 views

Interpolate current Course value of GPS using previous Course values

I have a set of GPS data with Lat, lon and Course. I need to interpolate current value of course, using previous values of Course. The formula I am using is not accurate in curves.In C language I was ...
2
votes
0answers
117 views

QGIS on android4 with bluetooth GPS

I'm trying to set up a moving map on my tablet (asus, Android 4). I've installed QGIS (latest version), which works. I've got a blue tooth external GPS, which I've paired to the tablet. However, I ...
2
votes
0answers
232 views

Are there any shapefile-based GPS data recorders?

I am looking for a data recorder that can be programmed to send a serial data request to a field computer and then accept and record an incoming data string and tie it to GPS location and then save ...
2
votes
0answers
81 views

From gpx to line segment 1Km using ArcGIS 10

I have gpx files containg points with attribute data such as time and date. I'd like to convert them into lines, and that is not a problem, but what I want to do is create 1Km segments with time and ...
2
votes
0answers
117 views

How would I modify GPS tracker to accept two nmea inputs and gpsmarker to include a heading vector?

I use QGIS on a research vessel and wonder whether I could modify the QGIS 1.8.0 gpsinformation widget. I want to achieve two things. 1. Change the GPS marker to a boat shape which points in the ...
2
votes
0answers
352 views

How to handle real time GPS data with ArcGIS Javascript API?

I'm developing a web app using Arcgis Server 9.3.1 and Javascript API I have a database with gps data from several vehicles and I need to display each vehicle real position in a map. I display this ...
2
votes
0answers
94 views

How to configure various client applications to display AVL data?

Given x number of GPS units transmitting NMEA formatted strings back to a server (xxx.xxx.xxx.xxx:xxxxx) is there a way to listen in on the traffic and parse NMEA formatted strings for display on a ...
2
votes
0answers
307 views

How to read a .GPB file in C#?

I have a .GPB file, I need to extract the common GPS data from it but I don't find a clear structure that specify the contents of that file. as a sample record from file 00000260 02 11 A9 61 E7 96 ...
1
vote
0answers
28 views

Uploading Polygon Shapefile to Garmin GPS. How to View all Polygons?

I am trying to upload a polygon shapefile to a Garmin 60CSx unit. The polygon shapefile is a small area containing polygons of vegetation types. There are are 53 polygons (records) in the shapefile. I ...
1
vote
0answers
122 views

convert GPS to XY coordinates

if i have obtain GPS coordinates as Latitude/Longitude, then i need to convert them to XY coordinates, i see this link actually i need to get the Trilateration , in its equation i need the XY ...
1
vote
0answers
49 views

calibrating vector line in qgis

I have loaded GPS points into a QGIS vector layer. I also imported a vector line from a dxf file which doesn't have georeferencing. I would like to fit in line geometry between the GPS points - how ...
1
vote
0answers
140 views

Convert GPS coordinates to EPSG:54004

I need to convert GPS coordinates to EPSG:54004 on android. Are there any libraries or formulas to acomplish the task? Thanks in advance.
1
vote
0answers
98 views

Get GPS way points to exact place

I added some GPS way points on land use layer. but way points are not in exact place.(Way points are located at little bit away from exact place) I want to adjust way points to exact place. GPS was ...
1
vote
0answers
106 views

How to enable OSM map in Garmin?

I've installed two OSM maps, but I cannot use them in Garmin. See the window of Utilities / Manage Map Products: The maps are not lockable, but I cannot use them in Garmin... What shall I do to be ...
1
vote
0answers
310 views

Importing GPS coordinates correctly

I am importing a gsx set of waypoints with lat/lon taken in degrees, minutes, and thousandths of a minute. When they are added to my project, the waypoints are not showing up correctly - the ...
1
vote
0answers
195 views

Holux GPS logger .itm fileformat

I'm looking for a spec sheet or a library to open and decompress .itm files from the Holux GPS logger. Has anyone worked with the proprietary .itm format already and can provide me with some usefull ...
1
vote
0answers
186 views

Draw a skyplot with calculated ECEF values (in meters)

I have ECEF values that I calculated from ephemeris subframes 2/3. Using this information, I'd like to place these values on a skyplot based on my current location. I'm using a C# picture box for my ...
0
votes
0answers
26 views

Updating position for a list of markers

I am working with Google Maps. Specifically, I am working with http://hpneo.github.io/gmaps for a gps tracker simulation, here I need to update the position on each point. At the gmaps script, ...
0
votes
0answers
31 views

QGIS GPS live tracking adding polygon vertices

Maybe I'm missing something or maybe it is a bug? I'm trying to add polygons using the GPS information console. The only button available to record data is "add polygon", but if you click on it, you ...
0
votes
0answers
28 views

Is there any plan to integrate support for MOTOTRBO GPS data?

As the Mototrbo digital technology including GPS capabilities is getting more and more popular in the radio industry, is the any plan to integrate the GPS data received from units in the field to the ...
0
votes
0answers
60 views

Download/Upload GPS/Qgis don't work anymore

We were using Qgis and GpsBabel to download waypoints and tracks from GPS garmin 60 or 76. Since few weeks, this is not working anymore. There is a error windows, and nothing is created. I tried ...
0
votes
0answers
51 views

Is it possible to see polyline as route or track data on GPS?

I would like to see polyline on GPS. First, I try to convert polyline to GPX. I uploaded GPX on GPS. SO far, I could not see the line on GPS. First of all,is it possible to see polyline as route or ...
0
votes
0answers
69 views

GPS tool does not work well on QGIS 1.8.0

I installed GPS tool as plug-in and GPSBabel as additional software. I connected GPS through USB cable. I set new GPS device edittor according to below site. ...
0
votes
0answers
77 views

matching gps coordinates to a hand drawn map

I am looking for a professional who can help in the creation of a map app that requires GPS coordinates to be matched to a hand drawn illustrated map. to get an idea of the types of maps we are ...
0
votes
0answers
36 views

Associate media to gpx vector layer from Python Console

Essentially, I would like to have the description in the form of text annotations when i hover my mouse over the gps entry. And if i click the same, it should display the images. So I started off by ...
0
votes
0answers
310 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? Thank You.
0
votes
0answers
95 views

MapFish Print latitude, longitude innacuracy?

I'm new to GIS so this may be trivial: I'm using MapFish Print to create some PNG. I have issues to place the viewport. When I use a random GPS coordinate: -20.904522,55.475106 which seem to point ...
0
votes
0answers
97 views

Building a private GPS almanac server - practical experience

I'm trying to provide a source of GPS almanac files (in SEM format) for a non-connected / sometimes connected network. I know that I can download them from the USCG NAVCEN. However I don't want to ...