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

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Manually reducing the number of available satellites per epoch in a RINEX observation file

As part of my research I will need to test some GNSS positioning algorithms using only four satellites. To ensure this I've edited a RINEX observation file manually and for every epoch I have only ...
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1answer
19 views

Trying to find the manual for a Sokkia GIR1000

I'm trying to track down a manual for a Sokkia GIR1000. My department has one but over the years the manual seems to have disappeared. Does anyone have one or know where I can get one?
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1answer
37 views

How to determine the closest feature to my points?

I am doing a research on transportation for motorcycles. For each trips, I have the origin points and the final destination coordinate points. I also have another landuse layer with my points of ...
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1answer
2k views

How does a GPS/GSM/GPRS Tracker work without a monthly fee?

GPS newbie here. Looking at this product: http://dx.com/p/gps-gsm-gprs-tracker-for-personal-remote-positioning-29284 How does a GPS tracker work without a monthly plan?
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95 views

GPS points displaying in the wrong place [closed]

I'm trying to help a student by importing an excel table of Lats and Longs into Arcmap, but they are displaying in the wrong location - I am also a bit suspicious of the coordinates. I imported the ...
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1answer
673 views

How to extract GPS information from Garmin Cam 20 video files

I just got a Garmin Dash Cam 20 and recorded some videos with it, and also confirmed that Garmins own player can show the GPS information on a Map. I cant seem to find any technical information on ...
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48 views

Uploading Shapefiles to Garmin?

I am trying to upload shapefile polygons onto my Garmin 60Cx GPS. I use the Trace tool and load shapefiles via Minnesota DNR's application. There are almost always gaps in the shapefile on the GPS, ...
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61 views

GPS Location in Chrome

I am wanting to utilize a high accuracy GNSS position in a GIS data collection application optimized for Chrome running on my Android device. The problem is that the device doesn't have Google Play or ...
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184 views

Drawing route on google map using gps device and calculating actual distance?

I Want to draw route on google map with the help of gps device and calculate the actual distance. Can anybody help with this? public GoogleAPIModel GetDistance(string origin, string destination) ...
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1answer
55 views

Connect / Disconnect GPS device via PyQGIS

In QGIS I would like to establish a connection to my GPS device programmatically (not via button in the GPS control panel) I found out how to get available ports with QgsGPSDetector i.e. ...
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3answers
112 views

Why does GPS not give any info before it has a fix?

All GPS devices tell me how much positioning error there is in the fix (e.g. 12 meters). Then why does it not tell me anything before it has a very accurate fix? When a device is looking for its ...
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1answer
70 views

Time of the gps fix in GPGGA sentence is always rounded

I am using QSTARZ 818XT device for my app. I am using GPGGA sentences to get the GPS fixes, but I have noticed that timings are always rounded like xxxxxx.000 - for 1Hz GPS frequency and xxxxxx.x00 ...
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1answer
128 views

Accessing GPS from QGIS 2.14.1/Python 2.7 /Windows10

I would like to access the device described at QGIS live GPS tracking /recommended hardware (GPS USB stick) via QGIS/Python. A gps module does't seem to be part of the standard installation of python ...
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2answers
181 views

QGIS live GPS tracking /recommended hardware (GPS USB stick)

Is there a list or any other recommendation of certain GPS hardware (esp. GPS USB sticks) working with QGIS? I have been off this topic for far over a decade, and i remember that in former days not ...
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1answer
165 views

How to identify a series of Longitude and Latitude coordinates for a building? [closed]

I have hundreds to thousands rows of data that includes the GPS coordinates of the specific location (includes building footprint and outside the building within the property survey boundaries as well ...
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4answers
4k views

Free MobileGIS like ArcPAD

I'm looking for open-source program like ArcPAD. I have read all questions and answers, but i find nothing. I need the program for PDA (Dell axim x51v + GPS modul) and I want mapping points (trees or ...
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1answer
16 views

Discovering gravimetric station data, including location and measurement?

I would like to refine an precision estimate of local gravity based upon current GPS position. Ideally, similar to the National Weather Service API, I would like to interrogate a server with a REST ...
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40 views

Forming a uniform grid of GPS coordinates from a starting GPS coordinate

I'm trying to find a method in which I can form a uniform 2D grid, relative to a starting GPS coordinate. See the diagram below The red point represents the starting GPS Coordinate, which can be ...
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2answers
473 views

Convert GPS coordinates to EPSG:54004

I need to convert GPS coordinates to EPSG:54004 on android. Are there any libraries or formulas to acomplish the task? Thanks in advance.
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64 views

Convert GPX/KMZ to google maps directions

Is there a way to convert a set of waypoints in a GPX/KMZ file to driving directions suitable for Google Maps. There are numerous sites listing community generated routes which I am unable to load ...
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38 views

What technique would I use to translate any GPS coordinate to a grid?

If I wanted to divide the existing GPS coordinate system (lat,long) into a "grid" - effectively reducing its resolution - are there any established techniques, formulas or gotchas that I might benefit ...
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0answers
42 views

How can I position gps point on svg (or any other special type if exist) scheme of building?

I have an indoor map of a building in svg and this is an only scheme of a building, there is no google maps or any other maps. But I need positioning (navigation) by gps coordinates in this scheme. ...
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1answer
68 views

How to improve GPS recording?

The image shows as example a small loop by car, recorded by two Garmin Dakota 10 devices. It seems both devices have had difficulties caused by the surrounding buildings, the "blue one" seemingly had ...
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27 views

GPS similar locations aggregation

I have a set of GPS locations (long and lat) where there are many similar locations, i.e., the difference between any two locations is less than 1 meter, so these two locations are virtually the same. ...
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2answers
3k 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 ...
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33 views

Is it possible to use DGPS device to take longitude, latitude and elevation values in local geodetic system (i.e. Indian Geodetic System)?

I want to survey a land in India using Indian Geodetic System (GCS Everest India Nepal ESRI: 37203 or EPSG : 24378). Can I define my own projection system in DGPS, so that it can take values in this ...
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1answer
12k 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 ...
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2answers
115 views

Are speeds in GPS data obtained by detection or calculation?

I have been doing a study into taxi behavior with its GPS data. I could calculate taxi's mileage by either longitudes and latitudes or times and speeds in the data. Since there are several errors in ...
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2answers
227 views

Survey Data to GIS database [closed]

This is a General Question on a possible workflow for Survey Data directly to ArcGIS In most GIS/Survey workflows there is a field collection team and backoffice GIS team. When the availability of ...
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1answer
2k 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 ...
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9 views

from/to ellipsode to/from cartesian conversion

i am trying to convert from/to ellipsoidal coordinates (lat,lng,alt) to/from cartesian(x,y,z) i wrote the below code to do the conversion, but given the initial values of the gpsLat and gpsLng i ...
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53 views

How can one reprogram a cheap GPS tracker device?

I was wondering if I could get a cheap GPS tracking device such as this one on amazon and reprogram it to send the co-ordinates to my own server? I would then like to generate reports from the DB on ...
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1answer
26 views

Creating points with co-ordinates in QGIS to upload to GPS

I have generated a random point within a set area. I have done this using the Google Maps plugin layer. The CRS is set to WGS 84. I want to get the co-ordinates for this point so I went into the ...
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1answer
74 views

Exporting Images Linked with Survey data , from a GPS to GIS format

We were setting up a workflow system , where in we attach Survey images to our collected point data ( Leica GPS) . The same can be viewed in Softwares like Leica Geo office, but a GIS export of the ...
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4answers
1k views

Real time map matching using ArcGIS Desktop?

I am working on a project which requires real time map matching. I am currently using ArcGIS but not sure whether it will work. Here is what happens with my system: the cell phones sent GPS fixes ...
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38 views

Testing a new GPS positioning method

My PhD research involves developing a new positioning algorithm for GPS. The focus on the research is on the mathematical aspects and not to build a GPS receiver. However, we are interested in testing ...
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12 views

Where ionospheric coefficients come from?

There are 8 coefficients in broadcast GPS message (ION ALPHA and ION BETA in the header of RINEX navigation file) that are the part of the Klobuchar model. Is there an open source of this ...
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2answers
186 views

How does a GPS device determine bearing?

Following a discussion on Math and this particular comment, I am wondering how a GPS receiver determines its bearing. As I understand it: GPS is not a directional system, thus bearing can only be ...
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3answers
808 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 ...
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2answers
194 views

API for land use/land cover

I'm making a mobile game that uses GPS to interact with the real world. The game should be able to "see" what terrain/land use/land cover the user is currently in. Ideally, the game would send the ...
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18 views

SPOT GPS (Find me Spot) Feeds for ArcGIS Online

Does anyone know if it's possible to get a feed from your SPOT GPS account and turn it into a live tracking layer to use in ArcGIS Online? I did find what appears to be a SPOT testing account from ...
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1answer
55 views

How GPS coordinates grows?

I'm working on a project which uses GPS coordinates. I have a UAV that flies, for example, over a meridian or a parallel. I suppose that the coordinates I'm reading from UAV are always increasing or ...
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0answers
90 views

how to transfer GPS device coordinates into mobile android app?

i'm trying to make an android app that collects data field in high accuracy, since the phone native GNSS doesn't provide highly accurate coordinates, i want to use Coordinates provided by a real GNSS ...
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211 views

Windows desktop application that allows to visualize, edit, download, upload and convert GPX files?

I am looking for a simple application that will allow me to visualize GPX data, edit and create new GPX tracks, areas and points and download/upload GPX data to and from devices. This application ...
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1answer
55 views

Add points at specific gps coordinates in qgis [duplicate]

I created a layer in order to draw points with the azimut and distance plugin. IT didnt work at all. There was not even 1 point created. I followed the tutorial here: http://www.teuderun.de/workshops/...
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2answers
218 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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32 views

Creation of 3d terrain from real data [duplicate]

Possible Duplicate: 3d terrain from data in postgres I am pretty new to spatial database and 3D data. I have a project where i have to create a 3d terrain from data being taken by me by a sort ...
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2answers
89 views

How to rename several layers at the same time?

I have got some GPS tracks (MultiLineString). As I import them to QGIS, they look like this: I would like to merge them and to do so, I have to rename all of them like this (picture 2) otherwise an ...
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10 views

Getting *dop values from a skytraq based gps logger

I am preparing to a project where we are to log several free ranging animals. At the moment I am looking at different gps-logger. One of the more promising is the canmore 740. One issue I have with ...
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3answers
1k 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 ...