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

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Transfer from Android phone to Windows OS truncates lat long

I am clicking GPS enabled pictures of sites which are less than 500 metres apart through Android based Samsung ACE Duos phone. I later use Google Earth on my Laptop to view these geo tagged pictures. ...
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0answers
25 views

Conversion of (lat, lon, height) from GPS to another CRS

I have latitudes, longitudes and ellipsoidal heights derived from GPS readings, referenced to the ITRF08 system with vertical datum (CGVD2013) - http://webapp.geod.nrcan.gc.ca/geod/hmod/hmod.php How ...
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4answers
159 views

exporting metadata from gps camera to spreadsheet

I have a question involving exporting metadata from a GPS camera to an application such as a spreadsheet. In essence, I'm working with a significant number of images taken with a GPS digital camera. ...
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6answers
3k views

Is GPS more accurate on specific hours of the day?

I have heard that the GPS system is more accurate, and less accurate on some specific hours on the day. If this is true, how can I get the information on when GPS is more or less accurate at my ...
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1answer
122 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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1answer
164 views

Automatically panning the map in ArcGIS when using the Time slider

I have a point dataset with time-stamps at 1 minute intervals showing a driving route. I have enabled the Time properties of the layer and I am able to use the Time slider to see the points move ...
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1answer
218 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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1answer
4k 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 ...
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0answers
12 views

Replicating CSRS PPP solution in RTKPOST, gLAB

I analyzed the GNSS position data using CSRS , RTKPOST, gLAB. From the results, I noticed that the CSRS results for NEU errors is the least, while RTKPOST and gLAB were comparatively larger. I tried ...
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1answer
228 views

What causes the GPS offset/shift in China?

I've spent close to two full days trying to understand the nature of the infamous GPS shift in China. After sifting through the noise, two recurring symptoms are that: GPS coordinates (WGS-84) plot ...
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2answers
69 views

GIS Equipment for 911 Call Center [closed]

I am the GIS administrator for a 911 call center. Currently we use ArcGIS for our mapping, and my director recently told me that I have a budget every year to purchase GIS/GPS equipment or training. I ...
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0answers
13 views

Is there a way to create a custom, navigable GPS route?

Is there some sort of way to create a custom GPS route that can say, be plugged into a maps app like Google or Apple maps? For instance let's say I created a route that is a drive along Pacific ...
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0answers
12 views

Processing obs files in glab (PPP)

I have data for a trimble receiver and would like to run PPP analysis for its positioning errors. I use glab for this purpose. For the orbit and clock source, I use the final orbit data provided by ...
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1answer
40 views

Latitude & Longitude values from Simple Voyage Data Recorder [SVDR]

I am receiving values in the form of 0113.7276,N,10339.0121,E from a Ship Data Recorder. I am not a GIS/ GPS expert and am unable to decipher what do these values mean, because they are out of range ...
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0answers
15 views

Given raw NMEA data, how do you estimate accuracy on-the-fly?

I have streaming NMEA data from a GPS device to my application. One of the sentences includes HDOP. I previously calculated the circular error probable (CEP) for this unit. How can I calculate the ...
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2answers
70 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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1answer
22 views

Getting Intra-Maps roam to interface with internal GPS

I've got Intramaps Roam installed on a Panasonic Toughpad fz-g1 with integrated u-blox M8 gps. When I open up GPSviewer I can see my position, everything seems fine. When I enable GPS with ...
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0answers
8 views

Inputs for GNSS data processing : NEU error

I have some .?o and .?n files that i need to process to obtain the NEU errors. I understand that for a very accurate estimate, i need reference stations (the more, the better) to obtain baselines. ...
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0answers
9 views

Remote USb gps device location in QGIS server

I have QGIS server in linux. I have navika usb GPS device connected to a laptop.Laptop and QGIS server are interconnected via ethernet.How do i get the GPS device location in the server as the devicis ...
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0answers
92 views

What projection system is used in China which is aligned with WGS84 [closed]

I have some GPS tracks in Beijing. I want to project it and convert the lat long degree values in meters for calculation in euclidian space. I was wondering what is the most suitable coordinate and ...
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0answers
30 views

ODK Collect GPS Accuracy

Good day. Is it possible to require a minimum accuracy of the GPS widget? I know about accuracy threshold but what I need is to prevent forward swiping/finalization of the form if GPS accuracy is low. ...
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2answers
130 views

Why does my phone's GPS suffer from “urban canyon” problems in Beijing but not New York?

In a separate question on Travel.SE I asked why my phone's GPS didn't seem to work in Beijing, China. Turns out that it was simply an "urban canyon" problem, and that the GPS did in fact work when I ...
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1answer
62 views

GPS Live tracking with qgis android

I have a Tablet 10.1 notes on which I installed QGIS Android (v. 2.8) and a Garmin GPS 62 stc. So I tried to do the "live GPS tracking" by connecting through the USB cable the GPS to Tablet. Next, ...
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9answers
30k views

Why does GPS positioning require four satellites?

I have a question on the GPS positioning algorithm. In all books I've read for 3D positioning we need four satellites, and I don't understand why. We need to calculate three variables: x, y, z. We ...
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1answer
2k views

Cheapest centimeter accurate satellite positioning (GNSS/GPS)

I am looking for a cheapest possible GNSS/GPS setup with a centimeter precision without much HW hacking. I am not able to produce my PCB or do any soldering (though I would do that if there is no ...
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1k views

Calculating compass bearing between two GPS coordinates… with a twist [closed]

I'm building a virtual tour application that uses Google's streetview code to render the panoramas into a non-distorted view. Each panorama has 1 to n links where the user can select to move on. I ...
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1answer
24 views

For GPS point data using android, default camera app or other software?

I'm curious to know about your experience using the default android camera app for geotagging photos vs other apps. I am going to trial a few different of these apps over the next month or so on ...
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0answers
28 views

Why does my Android always show same lat/long for geotagged photos? Can I override this?

I am looking to collect point data with my Samsung Galaxy S3 using Android 4.1.2 However, every photo returns the exact same lat/long position Is it possible to override this and if so, how?
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2answers
4k views

How to capture accurate GPS points using mobile devices?

I'm currently working in Vietnam as a climbing guide, but am putting my GIS skills to use by doing a side project for the company involving the mapping of climbing routes. Along with another employee ...
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1answer
228 views

How to use OpenLayers Geolocate with the OpenGeo Suite Client SDK?

I’d like to have GPS functionality added to my OpenGeo Suite Client SDK application. From what I understand it should be possible to use the Geolocate control from OpenLayers. Preferably there ...
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1answer
197 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
236 views

Android Tablet KML/KMZ App for polygons w/offline & GPS capabilities?

I am looking for an Android app which allows me to view and query polygons stored in KML and/or KMZ with a GPS point representing my location and offline capabilities. My KMZ files are being output ...
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1answer
257 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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0answers
27 views

how do calculate nearest point in earth map with coords

I am having trouble calculating nearest point for another point with earth coordinates. I am particularly interested in calculating the intersection of linestring vector with earth coordinates. I'm ...
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0answers
15 views

Movement along a path with inaccurate location updates

Given a path and a vehicle traveling along that path. At intervals (~1 sec) the location and speed of the vehicle along that path is provided. The location of the vehicle is not accurate, a noise ...
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1answer
24 views

Map Positioning and Routing on Android

I have been instructed to create an small offline application in Android that have to: a) Use our own map in JPEG format as the basemap (Google Map / OpenStreet Map is not applicable) b) Show the ...
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1answer
796 views

GPS Coordinates to WKID 102100

I'm currently creating a project for ios and I'm using the latest ArcGIS IOS api. I have a mapView that is using the spatial reference skid 102100 and i am receiving lat long coordinates from an ...
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1answer
28 views

Getting started with RTK base stations

My employers are looking into a partnership with a company that provides RTK base stations (they specialize in Topcon equipment) and are planning to replace our old total station with a Topcon HiPer ...
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2answers
49 views

iPad with real GPS

Historically, iPads have not had true GPS. The GPS they have goes through a cell phone network, called Assisted GPS. Now I hear that iPads are coming with true GPS. How do I know if a particular iPad ...
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1answer
249 views

downloading waypoints from Garmin GPSmap 60cx to QGIS2.2. Am I missing a step?

QGIS2.2 64 on W7 64 is failing to download waypoints from Garmin GPSMap 60cx USB port. GPSBabel installed and the GPS Tools dialog is OK: GPS device: “Garmin serial”, Port: ”USB”, Feature type ...
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1answer
52 views

How to decode GPS coordinates from Android device XML file?

I’d like to decode the location coordinates from the XML file from my Android phone (SGS2). Any solution how to do it, how to convert them to usable coordinates (longitude/latitude)? Looks like it's ...
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1answer
169 views

iPhone app to record 3D location information

Does anyone know of an app that would run on an iPhone or iTouch that would record the X,Y and Z information from an external GPS? I am using a Dual XGPS150 Bluetooth receiver. The GPS will record ...
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2answers
71 views

How to extract NMEA outputs from an external bluetooth GPS to an Android device

I am requested to create an Android app that have to connect to an external Bluetooth GPS and read the NMEA output and visualize the location on ad digital map. I am a new comer in this aspect. ...
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1answer
190 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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2answers
76 views

How to import GPS waypoint, track info into ArcMap 10.2?

I heard that ArcMap 10.2 can import waypoint and track information directly from a GPS without bridging it from MapSource or BaseCamp software. Can someone give me tutorial or link to a video that I ...
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22 views

Regarding processing of GNSS data heights

I have a TRIMBLE GPS receiver and in its data, I am able to derive the ECEF xyz coordinates. My objective is to obtain the orthometric heights, which I could do using the equation h = H + N. My ...
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1answer
47 views

Is this distribution of GPS positions caused by multipath distortion?

I have some GPS points that are close to where they should be, but not nearly close enough (horizontal precision is around 10 meters). Looking at the positions which comprise these points (there are ...
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2answers
50 views

How do some companies receive GPS data from vehicles if GPS's can't send any data?

I know that some companies offer tracking services for vehicles such as live GPS tracking they can access any time, but as you can't use the GPS protocol to send any data i wonder how the do it... I ...
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1answer
77 views

Field Equipment: Geneq SXBlue II with iPad and ArcGIS Collector app

My company just recently purchased a Geneq SXBlue II GNSS receiver to be pair with an iPad and the Collector for ArcGIS app. I have heard great things about the submeter accuracy of the unit; ...
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0answers
18 views

road network construction using latitude longitude and timestamp

I have gps data(latitude,longitude and timestamp) of a city over a month I want to use some routing algorithms on that data so need to construct road network or graph So how to construct road network ...