Global Positioning System (GPS)
1
vote
4answers
122 views
Where to license non-automotive POIs for France, Spain and Portugal?
qualified POIs are needed for a commercial project - should cover broad out-of-car usecases (not needed: parking, gas stations). Could be commercially licensable data or derived from national geodata ...
1
vote
3answers
96 views
Looking for a website to produce a file using UTM or LL or LL to UTM or general
Is there a website that allow me to upload my GPS file from UTM to lat and long to produce a new output file ? I am looking for one to run a batch a list of UTM or LL to converstion them in either ...
3
votes
1answer
650 views
How to calculate accuracy of latitude/longitude
I'm updating a Windows Mobile application to capture location information using the built-in GPS hardware. The Microsoft API provides a method GPSGetPosition that returns the following struct ...
6
votes
1answer
648 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 ...
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 ...
2
votes
3answers
243 views
GPS and GIS for real time monitoring of an object
How is it possible to store coordinate of object in server in real time using feasible hardware ( can be used by student) GPS into database and retrived in real time??
What are the names of ...
3
votes
2answers
222 views
GPS capable rangefinders or cameras that can capture lat / long data from a distance?
Anyone have experience using this technology?
i.e. field verifications of structures where you need to capture the lat / long of a house that is 1000 feet from the road with limited access.
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 ...
5
votes
4answers
449 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
8
votes
3answers
2k views
Example of a Dynamic Map Service that frequently changes?
A requirement of our web application is to automatically refresh a particular dynamic map service on a timer.
Requirement relates to a client who has a dynamic MS that consistently gets updates ...
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 ...
10
votes
2answers
310 views
What Type of GIS Powers Automobile Navigation Systems
My sister-in-law was inquiring about where she can buy updated DVD's to load into her car's system. Obviously I know the dealer/OEM would love to rip her off for such data, and I knew of no ...
0
votes
1answer
655 views
how to convert the easting and northing to a point and saved in a feature class in ArcMap?
I write a program to decode the message from the GPS device to get the easting and northing , but I don't know how to convert the easting and northing to a point and saved in a feature class in ...
4
votes
1answer
693 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 ...
2
votes
2answers
579 views
GPS - Garmin 60CSX connectivity issue
I have a Garmin 60csx, about 2 years old and I have attempted to connect it to my laptop/ArcView (GPS toolbar) using the Detect GPS Port to no avail. There is no port number being displayed and that ...
15
votes
3answers
497 views
Lightsquared GPS controversy: Where is the analysis?
GPS World reports that Lightsquared's network of 40,000 transmitters will interfere with GPS signals.
Initial technical analyses have shown
that the distant, low-powered GPS
signals would ...
1
vote
2answers
566 views
How do I download tracks from the GARMIN GPSMAP 78 usin DNRGarmin?
I have been able to download waypoints to DNRGarmin by accessing the GPX file. However, I have only been able to view waypoints.
How can I download tracks?
2
votes
1answer
795 views
How to read multiple .gpx files in R [closed]
Suppose I have a number of .gpx files (these contain GPX waypoint data from a Garmin eTrex). I want to load them into R with different names and manipulate them.
I can read one file thus:
...
4
votes
1answer
193 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.
...
25
votes
7answers
1k 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 ...
3
votes
6answers
1k views
Garmin GPS 78 Interface
Does anyone know how to interface a Garmin GPS 78 Marine GPS with their computer to manage waypoints (upload, download, save, etc.) Previously I was using the MN DNR Garmin tool, but it no longer ...
1
vote
1answer
176 views
delorme gps and delorme X map alternatives
We have a group doing field work and are having issues using delorme gps and delorme X Map and Delorme X Map.
Wondering if there is a way to connect the delorme GPS pn 40 to ArcReader / ArcExplorer in ...
2
votes
2answers
662 views
Locations of Geodetic Survey Benchmarks
Does anyone know where I can find a list of geodetic benchmark locations for Ontario? (If a list even exists that is...)
Thanks
7
votes
3answers
1k views
Do's and Don'ts for GPS Localization
We have recently purchased some new GPS survey gear (ProMark 500) and we have set up a localization around the town using some of the known survey marks.
While I'm pretty confident that I have got it ...
24
votes
6answers
726 views
How to cope with the newly discovered GPS bug? [closed]
Today the New York Times broke the news that after the Clinton Administration turned off Selective Availability in the GPS system, a bug had been introduced into the GPS satellite software itself, ...
5
votes
1answer
259 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?
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 ...
26
votes
5answers
2k views
Does an earthquake affect GPS?
There are news reports saying that the Sendai earthquake a couple days ago has shifted the earth on its axis and moved the island 8 feet.
Last year, there were similar reports with the earthquake in ...
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 ...
7
votes
3answers
7k views
How can I plot GPS coordinates on Google Map
What is the best way to plot GPS coordinates on a Google Map?
Are there any tools that can do that (written in python specifically)?
6
votes
4answers
556 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 ...
3
votes
1answer
152 views
How can a single line be computed from multiple possibilities
I have datasets containing continuous GPS streams of data that represent routes or trails. For any given route, I probably have at least 5 (in some cases many more) different sets of data. Given that ...
3
votes
4answers
610 views
Advantages of a GPS enabled PDA for field asset management
I'm having some trouble trying to convince some people of the advantages of having a entry level GPS enabled PDA for asset management.
I've been asked to look into GPS enabled cameras, I've since ...
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
268 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 ...
8
votes
1answer
113 views
Is there a geodetic benchmark that is fixed with respect to plate tectonics?
I see that NGS benchmarks are used to monitor the movement of geologic plates.
Is one of the benchmarks assumed to be in a fixed location, with movements of all other benchmarks measured with respect ...
12
votes
3answers
330 views
Software for analyzing GPS tracklogs to extract human-readable placenames
I have a pile of GPX-formatted tracklogs for many countries where I've travelled over the years (the GPS-device has been continuously on and recording for most of the trips). I would now like to ...
6
votes
2answers
330 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.
...
3
votes
1answer
781 views
show position on google map/earth, from gps data, using google API
For those that have used google's API for mapping (google maps/earth), I would like to know if is it possible to develop an application to receive NMEA data from a gps receiver, extract position, and ...
1
vote
1answer
192 views
Converting GPS heights to AHD heights
I was wondering if there is a way to convert heights that are logged from a normal bluetooth GPS to AHD heights.
0
votes
2answers
203 views
Length of forms in ArcPad10
I'm trying to create a survey with about 250 questions in ArcPad 10. Normally you would expect that a form you created in any application will be able to scroll in PDA if it is too long. But the ...
7
votes
5answers
673 views
How can I find positions on my land?
I have about 2 acres of land, wooded and brushy. There was a survey and the corners have rebar.
I am working on a site plan for house construction. I have two related problems:
Finding a spot on ...
3
votes
2answers
459 views
in seach of gps tracking (web) service to use with rails web app
hey out there GISers,
i am looking for a gps tracking service i can hook gps devices into and request their infos via a ruby on rails webapp.
does anybody know some?
any help is appreciated!
thanks,
...
1
vote
1answer
712 views
how to convert from ITM ref to GPS ref?
how to convert from ITM ref (Israel new map) to GPS ref and from GPS ref to ITM ref?
i need any C# sample code or formula for this
for example: 32.086156,34.769239 = 178364,665948
or : ...
7
votes
4answers
1k views
What data is sent from GPS satellites to receivers?
I know more or less how the GPS system works. But I would like to understand it in more details. Exactly what data is sent from a GPS satellite to a GPS receiver?
I think there is multiple types of ...
5
votes
1answer
547 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 ...
