Global Positioning System (GPS)
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 ...
3
votes
1answer
301 views
GPS problem in QGIS
I have a very strange problem that I cannot understand.
I am trying to put together a demo-laptop with QGIS and gps.
On other computers I have it working as expected, but on this particular box ...
2
votes
1answer
464 views
What happened to Live GPS Tracking in 1.8.0-Lisboa?
Dang, I was just getting used to Live GPS Tracking in 1.7.4-Wroclaw.
I downloaded the new version 1.8.0-Lisboa on another computer. The Live GPS Tracking
thing was in the View pull-down menu in ...
11
votes
3answers
2k views
Advanced android app for mapping and GPS logging
I am looking for an android app able to log GPS data like coordinates, altitude, current speed and would be nice if also the GPS accuracy/number of satellites. Many GPS apps are able to display these ...
2
votes
1answer
728 views
how to calculate RMS 2D and RMS 1D, using python?
I would like to calculate:
RMS 2D: standard deviation for the two coordinates of flat (67% confidence level)
and
RMS 1D: standard deviation for height (67% confidence level)
What is the formula and ...
6
votes
3answers
305 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 ...
4
votes
3answers
180 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 ...
2
votes
1answer
54 views
set wrong GPS unit in “degree” and want to change to “meter” in GIS while editing
I want to edit the GPS result in ArcGIS, but I found that there is a problem.
I set the wrong unit while I used the GPS outside , and the unit is "degree".
Although the coordinate system is correct, I ...
3
votes
2answers
130 views
What is the minimal data necessary to reconstruct GPS location?
Imagine that a minimal GPS device is attached to a moving object (animal, shipping container, geocache object, etc). Every few months, data from the device is downloaded for post-processing.
What ...
1
vote
0answers
133 views
how to correct the coordinate of points [closed]
I have some a layer which contains some points. The coordinate of the points should be GPS points. However, the coordinate of these points are not correct. What should I do?
I am using QGIS. If I ...
0
votes
0answers
32 views
How to find the GPS infomation in a layer [duplicate]
Possible Duplicate:
Get list of coordinates for points in a layer?
I have gotten a layer which contains some points. I want to get the GPS of these points. However, when I save it as .csv ...
8
votes
1answer
329 views
How much sense does it make to average (lat,lon) samples in order to increase 2D accuracy of a GPS location?
Several GPS applications, like this one, or this one, acquire multiple (lat,lon) samples of a given location, assuming that the GPS unit is not moving, and then take an average of the samples in order ...
3
votes
1answer
120 views
is the GPS network free or available for any device?
I have a question (I'm really sorry if is kind of dumb question).
But if I have a device with GPS (smarthphone,pda,pocket pc, etc)
Does the device need any additional service to enable GPS data?
I ...
2
votes
1answer
250 views
Snap Polygon vertices to Point features
I have a set of polygons drawn using an inaccurate GPS PDA. these polygons are sharing nodes.
after post-processing GPS data to get accurate coordinates i have a set of all the nodes, then i have to ...
3
votes
1answer
115 views
How to overlay map onto a corner of an image, using that image's GPS exif data?
I have several hundred JPG images taken during a time lapse of a drive, with each image containing embedded GPS information.
Is there an OS X friendly workflow that can allow me to:
create a ...
3
votes
2answers
278 views
Classification of GPS trajectory
I need a detailed description of a GPS trajectories. I don't need to know what a GPS trajectory is, I already know it. Exactly I need a paper (better if scientific cut) that talk about different type ...
2
votes
1answer
951 views
How do I calculate a xyz-position of a gps-position relative to an other gps-position?
I have two gps-positions (lon, lat, alt) and want to get the position of one relative to the other one. (in meters, as x, y, z)
How do I do that?
Thanks in advance.
Edit: The locations have a ...
8
votes
3answers
946 views
Bluetooth GPS to Smart Phone
Has anyone had any luck intergrating a GPS unit with your Smartphone? Looking to gain sub 5m accuracy. Ideally would like the phone to just use the better gps reciever when it is connected. This ...
7
votes
4answers
436 views
Does GPS signal quality depend on the chip manufacturer? Does it depend on weather?
(Sorry if GIS is not the right place to post this question to).
Recently me and my school friends had a GPS software application project to pursue at the university.
A device very similar to this ...
15
votes
6answers
755 views
Sources of realtime spatial data
I'm trying to set up a demo that serves up live spatial data, but am having trouble finding any suitable example data sources.
Ideally I'm looking for something that updates every few seconds; either ...
17
votes
6answers
1k views
How correct is the “Accuracy” value given by GPS devices?
I have a Garmin Forerunner 305 and a Google Nexus One Android phone. From the GPS on both these devices I can get a "Accuracy" value that is usually between 6-20 meters. How much can I trust this ...
2
votes
1answer
779 views
File IMG from OSM
Is it possible to convert or open an IMG file from OSM?
I don't find a solution for the visualization and conversion.
Thanks
1
vote
1answer
125 views
Mobile location determination
I was wondering how Google Maps on my Android phone can locate me with a good accuracy when my GPS is disabled.
At first I though it was with the cell tower but I'm not sure it can achieve this ...
1
vote
0answers
193 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 ...
6
votes
2answers
748 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).
...
3
votes
2answers
275 views
How to get the layers of my project to show while tracking with GPS?
I've been using/testing several versions of various GIS software and run into occasional issues. Right now, my biggest with QGIS is with GPS connection/downloading from/tracking. These are all ...
3
votes
3answers
3k views
Distance between GPS coordinates
Given a database of GPS points, a center GPS location, and a radius R (in meters), how can I find all points in the database that are within a distance of R of the center point?
Will the distance ...
11
votes
2answers
449 views
Why is getting a GPS fix so slow?
I understand the basic concepts of GPS positioning system and the use of trilateration but I don't understand why it takes so much time to get a fix.
On commercial GPS like TomTom it usually takes ...
2
votes
3answers
498 views
GPS device taking pictures and saving heading + HDOP?
I'm looking for a device that can do all of the following:
Take picture
Save lat-long GPS position + heading (angle to North) of picture [so need tilt-compensated 3D compass], in exif or other ...
1
vote
1answer
629 views
How do I calculate ECEF X,Y,Z velocities for GPS if I have no satellites
I'm attempting to simulate a GPS message where know variables are starting location, ending location, speed (m/s), and a bearing (0 - 359 degrees). How can I calculate the ECEF X, Y, Z velocities ...
0
votes
0answers
31 views
Calculating ECEF X, Y, and Z velocities between 2 points on Earth [duplicate]
Possible Duplicate:
How do I calculate ECEF X,Y,Z velocities for GPS if I have no satellites
This is my third attempt at explaining what I'm trying to do.
If I have two ECEF X, Y, Z ...
0
votes
0answers
49 views
Calculate XYZ velocities between 2 ECEF points [duplicate]
Possible Duplicate:
How do I calculate ECEF X,Y,Z velocities for GPS if I have no satellites
If I have a starting location (Latitude/Longitude), a bearing (degrees), and a speed (m/s), how ...
7
votes
1answer
134 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, ...
1
vote
1answer
828 views
Go to X,Y dialog box
If someone gave you a x,y coordinate numbers he/she got from. I put the numbers in the X,Y events on my ArcMap and they are in Meters numbers. We entered the number into the x,y dialog box. The ...
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 ...
0
votes
1answer
298 views
Sensitivity of Garmin eTrex 30
I have a very good experience with Garmin eTrex Legend HCx -
here and here they write that HCx has a very sensitive chip, that works in forest, deep valleys and in cities - and I can only confirm - ...
1
vote
1answer
1k views
Difference between Garmin eTrex Legend HCx and eTrex 30?
I have used etrex Legend HCx a lot and been satisfied. Now I've seen etrex 30 just for a while and it seems to me that the Legend is much more user friendly, good old menus with a lot of ...
3
votes
2answers
2k views
Using OpenLayers (with OpenStreetMaps) and PostGis for rendering data acquired from GPS tracking device?
I'm researching and planing to acquire data from GPS device and store them in postGIS database, then use geodjango to process/work them out and finally chart them on a map with OpenLayers.
Will these ...
4
votes
4answers
1k 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 ...
5
votes
1answer
180 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 ...
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?
3
votes
1answer
844 views
GPS Module Without Velocity or Altitude Limitations
I am looking for a GPS module that I can use in a high-altitude project. The problem I have discovered is that GPS manufacturers are required to place a set of restrictions on GPS modules. The ...
8
votes
0answers
294 views
Is there open source GPS post-processing software? [duplicate]
Possible Duplicate:
Post Processing GPS Data with open source software
Here at the office we have a couple of 15-year-old Trimble 4700 and 4800 units but now we don't have the software to ...
7
votes
11answers
1k views
Logging GPS and Accelerometer Data - Device Suggestion?
I am looking for a device that can track my location (lat,long) and speed all day long. Perhaps, I need GPS and accelerometer data bundled together.
What I want to do is to log my daily activities. I ...
0
votes
1answer
216 views
What GPS unit can I use to track myself all day for a 10 day trip? [duplicate]
Possible Duplicate:
Logging GPS and Accelerometer Data - Device Suggestion?
I will be visiting China this October as part of a field studies course and I want to be able to take the ...
1
vote
2answers
167 views
Is there a time limit on post-processing GPS data with Pathfinder Office?
Do I need to post process my GPS data within a certain amount of time after collection? Do the services that provide the correction data to Pathfinder Office only make that data available for a ...
13
votes
4answers
2k views
Why is GPS a free service?
The Global Positioning System (GPS) is a free service that is owned and operated by the U.S. Government and is always available.
When we buy a GPS device, we don't pay a monthly fee or pay a tax for ...
12
votes
5answers
2k views
How to get an elevation profile for a gps track?
I'd like to get a reasonably accurate elevation profile for a track recorded with a GPS (which often has very unreliable altitude data and occasionally none at all, depending on the model.)
Does ...
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 ...
