GPS is a space-based satellite navigation system that provides location and time information.

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4
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2answers
363 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
1answer
2k 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 ...
1
vote
1answer
421 views

Determine if GPS coordinate in Canada

I have GPS tracking solution and most my customers in US. My reverse-geocoding solution pretty basic: Table with US ZIP database Procedure in SQL Server where I search for city/state closest to ...
1
vote
0answers
120 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 ...
2
votes
0answers
162 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
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0answers
411 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 ...
2
votes
1answer
849 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 ...
7
votes
3answers
597 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
355 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 ...
3
votes
0answers
689 views

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

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 ...
8
votes
1answer
604 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 ...
3
votes
1answer
75 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 ...
1
vote
2answers
2k views

How do I open a shapefile in QGIS for upload to Garmin GPSmap 62?

I now have a polygon and have succesfully raised 25 random sample points and saved as a shape file. I have checked that GPS utility and the shape file are set at 27700 BNG but when I try and open the ...
0
votes
2answers
1k views

Converting GeoExplorer gps data points

I have been given what I'm told are differential corrected gps points (DGPS) and asked to convert them to something usable in current GIS (e.g. Arcgis, Qgis). They have names like R081320a.cor, ...
1
vote
0answers
262 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 ...
3
votes
2answers
192 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 ...
3
votes
1answer
172 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 ...
3
votes
6answers
7k views

Sending GPS Location to server

Is it possible to send my current location on iPhone or Android to the server so that others can view my current location?
5
votes
2answers
865 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 ...
2
votes
1answer
518 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 ...
11
votes
1answer
670 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 ...
1
vote
3answers
241 views

How to upload and download to gps

Do you have a step by step guide on how to upload/download points/wayponts and polylines/routes from a gps? Regards Christo
3
votes
1answer
222 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 ...
13
votes
3answers
4k 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 ...
3
votes
1answer
372 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 ...
19
votes
2answers
421 views

Precision when working with spatial data in GIS

Is there a basic or introductory study that examines and compares the precision of spatial data when working with varying precison of the data input, like having 1, 2, ... decimal places? with the ...
2
votes
1answer
3k 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 ...
11
votes
3answers
2k 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 ...
4
votes
1answer
259 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 ...
1
vote
1answer
162 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 ...
22
votes
7answers
7k views

Is there a good GPS track analysis library?

I keep writing custom code to work with GPS tracks: GPX files and NMEA logs from my phone, dedicated GPS logger, etc. I feel like I'm reinventing the wheel and am wondering if there's some standard ...
2
votes
2answers
562 views

How to convert Garmin Waypoints to Google Mercator?

I have georef some topocards with QGIS and the Google Hybrid Layer. So, this cards are connected with the Google Mercator System. Now I have some waypoints taken with Garmin GPSmap62 (in WGS84). ...
1
vote
0answers
315 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 ...
3
votes
2answers
412 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 ...
33
votes
12answers
23k views

Tablet or smart phone GPS vs “real” GPS

I've been reading a lot today about android and iphone devices being used for spatial data collection in the field and it sure seems to be that single purpose devices such as the extremely popular ...
11
votes
2answers
1k 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 ...
3
votes
3answers
873 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 ...
0
votes
0answers
37 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 ...
1
vote
1answer
1k 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
52 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 ...
3
votes
3answers
5k 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 ...
7
votes
1answer
209 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
478 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 - ...
3
votes
1answer
3k 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
405 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 ...
12
votes
3answers
877 views

GPS Elephant Tracking: Utilizing A-GPS, WAAS, DGPS and Understanding HDOP, NSAT, and ZDA

*I'm using a GPS data logger (qstarz bt-q1000xt) to track the movement of zoo elephants, and I have a variety of technical questions. I've had limited success receiving answers from the vendor. You ...
5
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 ...
2
votes
0answers
125 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 ...
10
votes
1answer
545 views

Overview of GPS tracking system technologies

Background: I've been asked by a friend to estimate the cost of setting up a GPS tracking system for a small fleet of buses, so we can do real time reporting of bus locations via a webmap. In my ...
4
votes
4answers
3k 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 ...