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

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I want to trace a gps device

I want to create a device that should transmit its location to a server using anyother medium other than GSM. Bascially I need a tracking device which i could give to my worker and he goes to a forest ...
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27 views

How to get correct measure with PostGIS SQL query? [duplicate]

First of all, sorry my bad english. I am new at gis. So I want to measure my road. I want to use measure unit kilometers. But I am a bit confused. I have a garmin etrex gps device. So I get my ...
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1answer
142 views

Yandex Navigator / Maps - Determining user location

Kindly redirect me to a more appropriate forum in case there exists one. I am an active user of Yandex.Navigator App (available for all kind of mobile platforms). Whenever I open the App, even though ...
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2answers
172 views

Where can I find the coordinate system used by GPS

How do you determine which geographic coordinate system is used by a GPS device? For example, my Garmin GLO is outputting NMEA data with lat/lon. What system is represented by those lat/lon values? I ...
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2answers
890 views

Does iOS know the phone's location solely from cell tower, i.e. without GPS data?

Question Does the iOS operating system know the phone's location even if one could turn off the iPhone's built-in GPS module or if it was broken? Elaboration What I understand I understand that ...
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82 views

How does a GPS unit ensure it has the same time reference as a GPS satellite?

I've been reading about GPS to find how it works, but one thing still bothers me. To calculate distance from GPS unit/receiver to GPS satellite, it uses the difference between radio signal sending ...
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1answer
130 views

Getting GPS coordinates perpendicular and parallel to AB

I already posted this question here And I got the solution thanks to Fang but the problem is that the coordinates I need to use are GPS coordinates and apparently GPS needs a different formula than ...
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2answers
46 views

Deployment of Zeno Field 3.11 in windows 8.1

Is it possible to install Zeno Field 3.11 in windows 8.1?
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1answer
89 views

How to find if two gps tracks were from the same trip?

Given I have gps tracks from many users running or hiking, how can I find out who were running together? In other words, which algorithms are there to find out who were in the same party? Haven't ...
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90 views

Benefit of DGPS for relative accuracy and speed measurements for receivers close-by each other

Consider that we are interested only in the speed and relative position accuracy of GPS receivers (i.e. their absolute try position on earth is NOT important). These receivers are all in a 90m x 90m ...
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341 views

What does 'Course Made Good' in NMEA string mean?

I was looking at some GPS data that a client sent me. It has lines like this: $GPRMC,183123,A,1725.4170,N,07825.4779,E,37.80,297,161214,, I was looking at http://aprs.gids.nl/nmea/#rmc, which says ...
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14 views

Simple app for generating polygons - offline solution [duplicate]

As the title says, but capable of importing raster, and exporting the vector to a compatible format to QGIS. The vector-layer needs attribtutes as well and has to be GPS-orientated. IOS or Android. ...
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1answer
49 views

Use of satellite-based augmentation outside of base station coverage

In certain locations GPS units can recieve an SBAS correction signal (WAAS, EGNOS etc) but are outside the coverage area of a base station. For example, EGNOS signals can theoretically be recieved in ...
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2answers
220 views

Store GPS trace with timestamps, then interpolate location by time

I'd like to: Load a 1-second interval GPS trace (not GPX) into PostGIS Then query the table at sub-second accuracy (about 5Hz), and get PostGIS to interpolate the location by time. Is this ...
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0answers
95 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 ...
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107 views

How to average GPS tracks?

I have GPS data - point cloud in a shapefile. Now I want to average this data and get on output a single GPS track. Here I found images but can't find algorithm. Maybe gdal or postgis can do it? Any ...
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0answers
71 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. ...
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160 views

Anyone know an iOS data collection app that exports raw GNSS data for differential correction?

I am pretty sure the answer to this is "No", but throwing this question out there in case someone knows of something I haven't stumbled across yet. I am seeing less expensive GNSS units show up on ...
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1answer
64 views

QGIS GPS Information Menu Automatically Add Points

We are using a Surface Pro 3 with Windows 8.1 64bit, Bluetooth GPS, and QGIS (2.4 standalone download). We have opened a new QGIS project and are able to connect to the GPS unit within the GPS ...
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92 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 ...
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1answer
60 views

Where can I find documentation on the NMEA sentences supported by the Garmin GLO?

I just picked up a Garmin GLO Bluetooth GPS device. Does anyone know where I can find documentation of the NMEA sentences it outputs?
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1answer
615 views

Base station for RTK-GPS using RTKLib

First of all I would like to say that I am new to gis-se and as such I will try to comply as much as I can to your policy. That said I am actually doing a little project which as the title says ...
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2answers
592 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 ...
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31 views

Calculate geographic position based on azimuth, distance and height [duplicate]

How to calculate the geographic position of an object in sky (Point B)(like an aircraft) from Home Point (Point A) based on only four variables: Lattitude and Longitude at Home Point, Azimuth at ...
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53 views

postgis st_makeline, points with rounded time

I have seen a number of example SQL statements that take gps points, order them by time, them use ST_MakeLine to make a Linestring. I think my trouble comes from that fact that my times are rounded to ...
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1answer
103 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 ...
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1answer
318 views

Convert Garmin or iPhone weird GPS Coordinates

I am trying to find a way to convert over 500 locations I have saved in my Garmin iPhone GPS app (iPhone 4S using Garmin StreetPilot v2.7), but I can't find a way to convert these coordinates as they ...
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2answers
849 views

Import Trimble Data without Pathfinder

I don't have Pathfinder on my computer. I need to pull data off of my Trimble unit (Geoexplorer 6000 series) and save it on an external hard drive or USB key, without using Pathfinder. This way, I can ...
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1answer
173 views

Map Matching GPS to Road Network [duplicate]

I'm working on a project for which I have GPS points and I would like to extract the sequence of roads related to those points. I know that this is called "map-matching" and that there is a load of ...
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3answers
293 views

How to calculate 'off track' error from GPS data?

I'd like to analyse navigational accuracy, comparing planned transects with the actual track flown from GPS data. For example, the planned transects below (green) don't match perfectly with the ...
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1answer
349 views

Finding Lost Samsung S4 with Lat/Long Coordinates

I lost my Verizon provider Samsung S4 phone while running on a narrow trail surrounded by brush. The phone no longer has power. Using Google Location History I obtained that Latitude and Longitude ...
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1answer
48 views

Categorizing GPS data based on cumulative time using ArcGIS Desktop?

I have GPS data which includes “Lon”, “Lat”, and cumulative Time from 0 (sec) as fields. I want to add an integer variable new field, “Trip,” which starts from zero, and is incremented by one after ...
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36 views

ArcPad GPS Data Captured misaligned

Data captured using ArcPad 10 is not displaying properly. The .shp file created in arcpad is diplaying a NAD 83 Zone 17 projection. From what I've been reading, the datum for GPS is usually in WGS ...
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2answers
315 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 ...
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250 views

Calculating distance in m in xyz between GPS coordinates that are close together

I have a set of GPS Coordinates and I want to find the speed required for a UAV to travel between them. Doing this by calculating distance in x y z and then dividing by time to travel - m/s. I know ...
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205 views

Can't find GPS in QGIS for Android

I have installed QGIS on my samsung galaxy note 10.1 (not 2014 edition) but I can't get contact with the GPS. I have the GPS information tool, but when I try to connect, QGIS shut down or nothing ...
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1answer
114 views

Mobile device GPS into a PDF Form

This is an issue I've been trying to solve for a while and am told it's not possible. I have made a PDF form with an input box for coordinates. As the form is for use on mobile devices, I would ...
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2answers
141 views

QGIS Installation on Windows

I'm newbie to QGIS and to this forum. I want to develop application using Qt on QGIS to real time updation/mapping of a symbol using GPS co-ordinates. Initially i have installed QGIS on Windows 32 ...
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98 views

Calculating angle of telemetry GPS points in ArcGIS for Desktop?

Does anyone know if it is possible to calculate the angle of telemetry GPS points in ArcMap? I would like to calculate the angle made when the bird travels from one GPS point to the next. Picture one ...
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38 views

Reference and Beacon Stations in Vietnam

I'm not sure if this question can be asked in this forum, but here it goes. I am on my way to conduct some remote sensing research in Vietnam, which includes logging of coordinates. This should ...
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1answer
195 views

Address and coordinates of European cities request

I have a database of couple of millions of records which I would like to geocode. The data consists of addresses and council. All addresses are of a certain European city. Questions: May I have ...
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1answer
530 views

Using the Live tracking with internal GPS?

We have some Panasonic ToughPads (FZ-G1) with a GPS a module built in. I know where it is and can locate in it in COM 3 and it connects, registers a signal, shows satellite locations, but refuses to ...
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1answer
254 views

Converting GPS cords to X Y based on wrapper

I'm trying to create some software for an airport and they require me to place icons of aircraft in their position based on GPS. I have 10x10 tiles each tile being 256x256 pixels and the origin point ...
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73 views

Calculating new satellite position given pseudorange measurements

I'm looking for a reference/text for an explicit formula to calculate a satellite position given pseudorange measurements from later epoch times. I've seen a lot of matlab code on the internet but I ...
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1answer
200 views

Computing the elevation angle of a GPS satellite with respect to the given receiver location

can anyone source an explicit formula for calculating the elevation angle for a GPS satellite as seen from a receiver. I can't seem to find one. Even a text reference would be great. I couldn't quite ...
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56 views

GPS with QGIS--what happened to the capture point?

I have been using QGIS for years but when v. 2 came out and important functionality seems to no longer work. In 1.8 the "capture point" or "capture line" buttons on the GPS panel would work. Ever ...
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36 views

Software to determine if a position is within a shape

I would like to know if there is software available that can: Given a position detected by GPS, Warn the user if they are within a shape that I created and put into a database. Any computer ...
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1answer
186 views

Trimble GPS data is not displaying in ArcMap attribute table

I am currently having difficulty trouble shooting a problem. While using a TRIMBLE GEOXH (GeoExplorer 2008 Series) I have the problem of missing data after exporting it to ArcMap from my GPS receiver. ...
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94 views

How can I store height info from GPS in QGIS?

I want to use QGIS as a tool for collecting GPS-Data in the field. One use case would be simple surevy tasks where I want to store the three dimensional position of points. QGIS is working fine on the ...
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65 views

Why does the postGIS file lose geometry?

I am loading shapefile data from a GPS into PostGIS via Leica ZenoOffice. This apparently imports fine with it's geometry in the attribute table. However, when I add a postGIS layer in QGIS the file ...