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

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92 views

How can I transform Real-time Local position system coordinates into GPS/WGS84?

I have a local coordinate system built with Ubisense sensors and tags (it is a real-time locating system used to automatically identify and track the location of objects or people). The local ...
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101 views

How to determine and send alert SMS for next bus stop in a GPS tracking system?

In my gps tracking system (PHP/MySql) I have got 5 Stops for a vehicle. Whenever the bus reaches stop 1, the passengers at stop 2 should get an SMS alert. And in the same way for the sops followed ...
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4answers
132 views

Linking up GPS points taken from rail network

Bit of a newbie here, trying to work out whether any PostGIS functions can help with my task. Apologies in advance if my use of GIS terminology is not up to scratch yet. I have a large database of ...
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128 views

How to approximate point to segment distance on sphere?

I would like to approximate the distance of a line segment from a reference point on the map (coordinates are gives as lat/lon). In the Cartesian coordinate system I would simply find the closest ...
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70 views

How to determine the Geoid model used by GPS receiver?

I have the following NMEA output by Holux M-241 GPS receiver: $GPGGA,144014.000,2227.0987,N,11410.1382,E,2,6,1.67,32.6,M,-1.3,M,0000,0000*7B I know that WGS84 height is higher than geoid height 1.3 ...
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37 views

How can i show online temporal data using Tracking Analyst?

I have online GPS tracking data . I'd like to show these data in webgis . I'm using ArcGIS Silverlight API . I used tracking analyst in Arcmap for offline temporal data but not online data. Is there ...
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44 views

Terrasync COM Port Unavailable

I have a Trimble GeoExplorer Series GeoXM that runs Windows PocketPC version 4.2 (Built March 15 2004 for a bit more resolution there). Lately when the unit has been out on a job it will periodically ...
3
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1answer
771 views

Replace Navteq maps by a free one in a car built-in GPS

My car (Opel Zafira) have a built-in GPS with Navteq maps (SD 900 NAVI). I wonder if it would be possible to update or upgrade the maps to an open source / free maps (like OSM). Or is it possible ...
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69 views

How to debug Live GPS and base layer alignment issues in QGIS?

I am trying to use a bluetooth GPS with a couple of base layers in QGIS. The GPS/bluetooth connection seems to be working great...I can connect and disconnect without issue. I've set my project CRS to ...
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39 views

Calculate Moving Time

I am wondering how web apps like Garmin connect or Strava calculate a "moving time" from a gps track. For example I might record a GPS track on my Garmin GPS that has an elapsed time of 5:34:26 but ...
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55 views

What is the best way to apply the correct ZIP Code when Geocoding

I need to batch geocode a set of addresses, some of them are missing the zip code causing the lat/lng to be placed incorrectly, is there a good way easily correct this? I am using a few geocoders, ...
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64 views

looking for a GPS device which can transmit the location directly

I am looking for a GPS device or receiver that can transmit its own location to a specified configured server directly. there will be no medium like mobile phone or computer in between GPS and Server ...
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2answers
409 views

Using handheld GPS for sub-meter precise positioning

I've heard that we could use two or more handheld GPS to get a better positioning accuracy using post processing techniques. Anybody can tell me the methodology? Also, can we program handheld GPS such ...
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2answers
80 views

How to choose spatial reference for GPS data?

We received GPs data from the vendor. I want using ArcGIS software to create XY event table and create a point feature class. What the spatial reference would be for the GPs data? Is it something I ...
3
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4answers
239 views

Why is GPS almost unavailable without a data connection?

When travelling to foreign countries, ie. when a data connection is unavailable because I don't want to spend big bucks using a roaming data connection, I noticed that GPS is virtually never ...
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4answers
460 views

Matching GPS tracks

I'm looking for a proper way to process multiple GPS tracks (so time ordered list of lat/lon points) and match/classify that segments, that are covered by multiple tracks: So it's not about ...
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1answer
136 views

how to plot gps coordinates on my own raster map?

I have lat log values available in degree format, i donot know how to access raster maps using c#, and how to plot accurately. which libraries should i use and what are the controls avialable ,i am ...
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2answers
1k views

How to export and import gps points from Garmin 62S and QGIS

I'm pretty new to using QGIS and I'm curious about how to import and export GPS points created in QGIS. I have QGIS 2.0.1 dufour on windows XP and a Garmin 62s. Any suggested walk throughs would be ...
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58 views

Megellan Meridian and QGIS GPS Tools help request

I am using QGIS 2.0.1 on Ubuntu 12.04. I have a Magellan Meridian GPS and I trying to use the GPS Tools plugin to download waypoints to a layer in QGIS. I have successfully used the Gebabbel ...
2
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1answer
259 views

What format is this GPS tracking string?

I am receiving tracking data from a device and I am not sure what is the format/standard of this string in order to properly process the variables, this is a sample string received: ...
2
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1answer
161 views

Is there any information in Sky Plot that is not in DOPs chart in terms of predicting accuracy in the field? (GPS data collection planning)

Joe only looks at DOPs chart and weather report for mission planning. Moe looks at both DOPs chart and Sky Plot and weather report. Is Joe missing out on something relative to Moe in terms of ...
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1answer
65 views

snap GPS points to sidewalks

I have whole bunch of GPS coordinates collected from a device and sometimes they shift around 10m. Is there anyway to filter/modify points and snap them to sidewalks? So far I've written some ...
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1answer
43 views

How to merge intelligently GPS sensors?

I'm working on an application with a lot of GPS sensors, for each vehicle and person in a scene. I want to show a vehicle and his occupants in the same marker. But I can't get the vehicle occupants ...
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1answer
132 views

Trimble Net R9 Base Station Receiver File Structure

We just installed our new GPS Base Station Net R9 receiver that replaced our old 5700 receiver. The old 5700 used Trimble's GPS Base software, which the new Net R9 does not. My first problem that I ...
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2answers
106 views

Mapping Trails with GPS - Hardware Suggestions

I have been hired to map about 100km of XC ski trails. I am super proficient in GIS but have not done any detailed GPS work since college when I worked with some sort of Trimble explorers. This is a ...
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3answers
100 views

Is there demand for a higher resolution alternative to GPS tracking in the GIS market?

If there was an alternative to GPS that provided higher resolution tracking, what applications would there be for it in GIS? Note that this means higher resolution, but not necessarily higher ...
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9k views

How to make work tablet integrated GNSS (GPS) on Windows 8 with QGIS?

I have tablet - Dell latitude 10, running Windows 8, with integrated Broadcom GNSS Receiver BCM47511 (GPS,Glonass...). Because it is integrated GPS and Windows 8, there is the "new" way of providing ...
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188 views

GLONASS Satellite Position Prediction using Almanac Data

GLONASS ICD has a section named "Algorithm of calculation of satellite motion parameters using almanac". It gives the formulas in order to calculate the position and velocity of the satellite. ...
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253 views

Android API - how get the car position (fixed to the road)?

All the android.location classes receives best REAL position of the GPS. Is that any way to get from Google navigation API the CAR position x,y - fixed (tighten, interpolated) to the closest road on ...
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675 views

Does the strength of GPS weaken in rural areas?

Does the strength of GPS weaken in rural areas? For example, based on how the satellites work, would the strength in the centre of Australia differ from a populated city in Europe?
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67 views

Photos layer in Openlayers

I have some photos. They have GPS information. I want to add they with a layer like markers to Openlayers map. How can i do? Thank You.
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444 views

How to find ring of coverage of GPS Satellite on WGS-84 ellipsoid?

Given the following: Time, t The set of IS-200 Ephemeris data, E, of a GPS Satellite corresponding to time t The ECEF position of the GPS satellite, P=(x,y,z), derived from the time and ephemeris, ...
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71 views

QGIS, SpatiaLite and GPS integration

I have QGIS an, access database and a Haicom gps all connected and running on a windows 8 machine. I want to integrate all 3 items so that while in the field i can enter information into the ...
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50 views

Combining two separate shapefiles with undefined projections out of Leica

So this is a mess. When the software outputs I have two shapefiles. The projections aren't defined, but I know one is WGS84 and the other is NAD 83. The NAD 83 includes northing easting and ...
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102 views

Points warped when exporting to shape file (position off in Qgis when imported)

I have just purchased a used Trimble GeoXH and I have done some surveys. I did the differential corrections in Trimble Pathfinder Office 4.10. I have exported the corrected and uncorrected files and ...
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50 views

How to calculate GPS coordinates of one location relative another location? [duplicate]

In location “A” I know longitude (lonA) and latitude (latA) (Altitude is 50m). Relative to location A I know the horizontal (p) and vertical (q) distances to location “B” (B’s Altitude is 0m). I want ...
2
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1answer
94 views

What is a reasonable time to get a gps fix with 10 meters precision?

I hope I'm asking this at the right part of Stack Exchange. Please bear with me if I'm wrong. I'm developing some gps based applications. The demands I have for precision are not very high, but I ...
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1answer
1k views

What is a .ssf file?

What exactly is a .ssf file? I am refering to the .ssf files used with Trimble GPS units. I am aware that it is some sort of post processing correction file, but I do not know more than that.
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188 views

how to make decent sense from scattered river depth measurements

I sampled river depth at scattered positions and I want to be able to make a map and GIS layers out of it. My problems are: As the river meanders the interpolation I do in scientific packages i,e. ...
3
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1answer
161 views

Is there any methodology or technology to post process the Mobile/Tablet GPS data

We have developed an application which is running on android OS for collecting the Lat/Long value of any feature and it runs in any type of android Tablet/Mobile but the problem is that the accuracy ...
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1answer
67 views

Creating new highway mapping data? Help!

I'm hoping somebody may be able to help or at least point me in the right direction, with a GIS/Mapping query that is a little unusual. I have been tasked at work with looking at how we create a ...
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1answer
20 views

Is it possible to calculate the route when source and destination having same junction using A* algorithm?

I am using A* Algorithm to calculate the shortest path. The route was calculated based on the junction. Shortest route was calculated when there was two or more junction in between source and ...
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85 views

Accuracies of various GNSS systems

I was looking for a comparitive statement of the accuracies achived by various GNSS systems such as QNSS, COMPASS, GLONASS, GPS..etc. however i find only discriptions of only GPS everywhere
3
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1answer
212 views

How can I get the GPS info from a PNG?

I am trying to get the GPS data from several hundred PNG photographs for display in Q GIS (so need to access the EXIF data). The online and downloadable viewers I have tried haven't yielded much ...
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1answer
123 views

How does TomTom store trackpoint information on its internal drive?

How does TomTom stores tracks and trackpoints on its internal drive? I maintain an open source computer forensics tool and would like to extract the data from both files and unallocated space. My ...
3
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1answer
707 views

Build a website to track GPS signals [closed]

I need to build a solution that allows me to track cellphones/tablets and display on a visual map. I think there are two parts, one is understanding the general architecture. The other is more ...
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2answers
189 views

Parsing raw data from GPS tracker

As a side project I've been hacking together a simple tracking system for my wayward dog using a cheap GPS / GPRS tracker. I've successfully got it transmitting data to my server over GPRS but while ...
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103 views

SQL procedure(s) to convert GPS traces to an ordered set of junctions in a network

I have three datasets that I have loaded into a geodatabase (spatialite or PostGIS): A set of GPS points collected from individual trips through urban areas. Points have a unique point id, a group ...
3
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1answer
54 views

List of actual GPS position

I have a question - where can I find a list of actual GPS position, for example - ships, airplanes etc. I need it for my project for College - I will create mobile/desktop/web app, which will show ...
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75 views

How to calculate a missing (one or more) lat/long value of a bounding rectangle?

Is it possible to calculate an unknown (one ore more) latitude/longitude value of a bounding rectangle. The log file that I need to process provides a pair of lat/long values for Upper left and Bottom ...