This tag refers generically to *any* space-based satellite navigation system that provides location and time information.

learn more… | top users | synonyms (2)

2
votes
2answers
492 views

Webservices for GPS (Upload on DB and display it)

i'm doing an application where my users would be able to upload their gps tracks. My idea is to put their tracks on mysql database and display it on appropriate map. Question:How can i do that? My ...
2
votes
1answer
234 views

Why are Garmin provided maps inaccurate?

Collected tracks on my Garmin GPS (Oregon 450) or in BaseCamp seem to be not in the correct position. There's only a little detail with major highways but it looks as though the route is shifted ...
2
votes
1answer
73 views

Why are my DMS points plotted way off from their true locations?

I'm having a bit of a nightmare plotting some GPS coordinates in QGIS. My coordinates came from a PDF so it took a little wrangling to extract the from the PDF and convert them to a CSV file. I've ...
2
votes
2answers
77 views

What gps app to use for mapping bus routes?

I'm looking for a GPS app for android to capture waypoints and lines. I'm going to map the route buses and the stop points. Which GPS app is recommended for marking “points” and marking the “lines”? ...
2
votes
4answers
219 views

Uploading maps to GPS (forestry maps: roads, trails, hydro, polygons)

I'm using a QGIS 2.2.0 Valmiera on a Windows 8.1 system Desktop. I'm a forester and I would like to have a cheap solution to load maps into the handheld Garmin 60, 62 or 64 series GPS. Free would be ...
2
votes
1answer
120 views

Calculating countries flown over on flight path

Say I have two airports given. I can then get their coordinates. Now that I have the beginning and end coordinates I can draw flight-path from the two locations. Now my question is that given two ...
2
votes
2answers
1k views

What class/types of smartphone chipsets support GPS, A-GPS, GLONASS AND have extended kalman filtering?

I've been testing several Android phones (all running Android 4+) Sony Xperia T, Moto G, Nexus and HTC 1 which are all giving decent tracks (all of which use GPS/GLONASS) However we are also using ...
2
votes
1answer
106 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 ...
2
votes
2answers
320 views

Vehicle tracking by QGIS

I need to do routing for a vehicle. A map with detailed turn-by-turn driving directions should be generated. For example, it should be like car race game in which the map with vehicle tracking is ...
2
votes
1answer
78 views

Where would a perfectly vertical vertical tunnel through the earth come out?

I am a programmer. I have a point P1 (lat,lon) given by GPS (WGS84) and I want to know the location of a point P2 if I make a straight line from P1 to the other side of the earth. I have read some ...
2
votes
2answers
935 views

How can i convert from local coordinates to coordinates gps?

i don know if this is the right place to publish this. i am working with business object tool traying to make a kml file to be imported on google maps. I dont know much about geographic systems, but i ...
2
votes
1answer
291 views

Transformation from WGS1984 to ITRF2008

We are using Projected Coordinate System: Ain_el_Abd_UTM_Zone_39N (Transverse_Mercator) in our GPS Devices and have valuable Coordinate data. Can I change the projection of this data this to WGS 1984 ...
2
votes
2answers
73 views

How can I transfer waypoints and tracks from Base Camp into QGIS2.6?

I'm working on transferring all my field data from Garmin Base Camp onto QGIS. This is an attempt to overcome the learning curve from basic trail GPS mapping programs to the real thing. I'd like to ...
2
votes
1answer
33 views

Coordinate display in Terrasync

I'm using Terrasync on a Trimble GeoXH 6000 - set for WGS 84 and UTM. It acquires satellites fine, but instead of displaying my current location in UTMS, the skyplot screen shows "12RVU" and then a ...
2
votes
1answer
116 views

How is Precise Point Positioning (PPP) exactly done?

I am looking for a positioning accuracy that is higher than normal consumer-grade GNSS receiver (mostly GPS/GLONASS hybrids with +- 5m precision). I came across RTK with dual receiver setup (base ...
2
votes
1answer
113 views

Accuracy issues between data in QGIS and Google Earth

Wondering if anyone can answer this question. I have a kml in Google Earth. When I import it to QGIS, and then import the Google Earth images they are in slightly different places. I used a QGIS ...
2
votes
1answer
71 views

Most accurate GPS hardware for less than 1 mile radius [duplicate]

I apologize if this is a duplicate but I can't find a good answer or area to know where to find the correct answer. I am looking for the technology or hardware around wearables or similar technology ...
2
votes
1answer
54 views

Adding GPS tracking data from Excel into QGIS

Sorry if this is an easy question! I have added GPS points in QGIS however all of them are the same colour. I want the points to be coloured differently for each individual. How do I do this? Thank ...
2
votes
2answers
95 views

Finding points that are within a set distance of other points

I have a large point file: several thousand. They are all GPS coordinates, recorded at different times, by different people. Many of them have unique data. So, for example, there will be one ...
2
votes
4answers
169 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 ...
2
votes
1answer
106 views

How to Deal with Overlapping Coordinates in Statistical Analysis

I decided to make an archaeological map about certain tombs distributed in the area of Crete and make some statistical analyses using the spatial statistical tools of GIS. Specifically, I'll be ...
2
votes
1answer
192 views

QGIS: Colour GPS track by speed

sorry íf I might ask this question the 101 time, but I didn't found anything with google or SE. I have a CSV file with WGS84 trackpoints and visualizing them with QGIS textplugin works fine. The log ...
2
votes
1answer
902 views

Is there an industry-standard official mapping of GLONASS satellites to “PRN” values?

In the U.S. GPS system, satellites are uniquely identified by the PRN number broadcast by each satellite. This ID is usually visible on most GPS receiver platforms that provide access to individual ...
2
votes
1answer
120 views

Pathfinder Differential Correction: “Use reference position from” who?

How do you choose either "base files" or "base provider"?
2
votes
2answers
847 views

How to find the Shortest Path between two coordinates points using pgrouting A-Star?

In PostGIS I have two tables: an osm road network and a table that contains the start and end coordinate points of each path (i.e. userid, start_x1, start_y1, end_x2, end_y2). I would like to know: 1) ...
2
votes
1answer
134 views

interfacing multiple gps

I am trying to interface NMEA output of multiple GPS units transmitting wirelessly to a single PC, each GPS position can then be shown on georefance map of that area. My question 1.) How to ...
2
votes
1answer
535 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 ...
2
votes
2answers
567 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). ...
2
votes
1answer
132 views

Finding intermediate points and speed over a segment

I have a dataset which is in the form of ( Time , Car ID, Speed at that moment, Lat,Long) and I need to do some machine learning on the data to answer the following questions : Best route from ...
2
votes
1answer
69 views

Bind GNSS receiver with android app over bluetooth

I'm looking to integrate a GNSS receiver with a Smartphone app. I've found only GNSS receivers that are meant to communicate only with their mobile interface, they don't provide any documentation for ...
2
votes
1answer
69 views

How to detetmine county of GPS coordinate?

I have a SHP file that contains all counties in the USA. I also have roughly 100 million GPS locations. I need to tally the number of GPS locations per county. A linear search through the counties ...
2
votes
1answer
42 views

Mobile GPS location and CAR GPS location showing different outcome

I want to make a CAR positioning system. I wrote a program which can show me the coordinate locations on a map. But when I get coordinates from MOBILE GPS and from CAR GPS, they both differ. Why ...
2
votes
1answer
66 views

Calculating the fastest routes and some points on the same time

I have two drivers and each driver has a set of about 15 locations where they need to drive to on a single day. Calculating the shortest route for both drivers is not the problem (using a matrix ...
2
votes
1answer
2k views

Looking for an android solution for offline kml/kmz file viewer with gps support

I have some KMZ files of cadastral maps. I need to fiscally go to the boundaries of my lands (parcels) and take a look at where they are with the gps and maps support. Some of these places are not ...
2
votes
1answer
257 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 ...
2
votes
2answers
239 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 ...
2
votes
1answer
43 views

Download from GPS / changing SCR / still not working

I use a GARMIN GPS; I download my points from the GPS by using GPS tool; I "try to" change projection (SCR) by changing layer property/specify SCR Still, it not working and I cannot view my layer on ...
2
votes
1answer
89 views

Open Source + Offline Geo Notebook

I am looking for an open source offline software to record points of interest that I might visit at a later date. Let's say I am reading a book about Alaska, I'd like to take notes about interesting ...
2
votes
1answer
351 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
1answer
662 views

Where can I find Foursquare Datasets?

I'm doing research which aims to analyse location based social networks. So the Foursquare dataset is suitable for me. Is there any Foursquare dataset available? I need 4 information in the dataset: ...
2
votes
1answer
1k views

Current time from GPRMC or GPZDA?

In GPRMC there is a time field, called fix time. Can I consider this always the same as value from GPZDA time? Is there any possibility that when GPS device is configured to stream both GPRMC and ...
2
votes
1answer
194 views

Keyboard shortcut for GPS data capture in QGIS

I would like to setup keyboard shortcuts for GPS data capture with QGIS. Using GPS Information dialog box, I could use Mouse-Left-Click to "Add feature" and "Add track point", but I would like to ...
2
votes
1answer
80 views

What operations do the GPS recievers perform after capturing signal from Satellite?

What are the operations on the signals recieved by a GPS reciever ? How does it process them towards achieving a position fix ? I need explanation with the decoding and correlating part of the ...
2
votes
2answers
689 views

how to make a line from a set of gps points?

As a part of my research I need to create the trajectory of respondents according to the their collected GPS data (including X and Y). I am familiar with python programming, but I am a beginner in ...
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 ...
2
votes
1answer
2k 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 ...
2
votes
1answer
1k 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: ...
2
votes
0answers
38 views

About Timestamp in Geotagging

I'm on my reasearch for GPS and sensors integration. I've just wondered that to integrate between GPS and camera you need time offset synchronize which called as a timestamp. But how does software ...
2
votes
0answers
26 views

How do I accurately measure a gps track over a long distance?

I am measuring the length of the Continental Divide Trail that goes from the Mexican border to the Canadian border. I have a .gpx file of the entire route in NAD83 with tracks about every 50 meters. ...
2
votes
0answers
47 views

Create “mean” line from multiple lines using QGIS

I have multiple lines features (also have them in multipoints...) representing similar path (mountain trails, in this case) with various GPS precision, resulting in many lines close to each other, but ...