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

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5
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1answer
282 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 ...
5
votes
1answer
68 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 ...
1
vote
1answer
891 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 ...
0
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0answers
36 views

How does a GPS satellite knows which gps receiver asked for it's location? [on hold]

GPS satellites get a lot of requests for information from many different devices, so how do they know to return the information to the right receiver?
0
votes
1answer
42 views

Developing an iOS GPS App

I'm an experienced programmer looking to develop a GPS App with these constraints: I Need a turn by turn level of precision I Need to know if a street is one way or not I Want to calculate an ...
2
votes
1answer
188 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 ...
1
vote
1answer
34 views

GNSS planning online vs trimble planning 2.9 software

Why using the same parameters GNSS planning on-line and Planning 2.9 Trimble show me different Dilution of precision (DOP on the graph)?! Which program is better mission planning solution for GNSS ...
0
votes
1answer
29 views

Accuracy of GPS and HDOP

Given a handheld GPS with an accuracy of roughly 2 meters (verified through field tests) and an observation with an HDOP of 1.2, the accuracy of that one observation should be within 2 meters X 1.2 of ...
4
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0answers
740 views

Microsoft Surface vs. iPad for mapping

I was recently introduced to the Avenza PDF app for iPad and I've been using it in the company I work for to help our field crews find their way around, and record waypoints and tracks. The app takes ...
1
vote
1answer
56 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 ...
0
votes
2answers
148 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 ...
0
votes
0answers
28 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 ...
2
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0answers
41 views

Good GPS navigation app for iPhone with downloadable OFFLINE maps?

I am looking for a good GPS navigation app for my iPhone that will work away from wifi and cell coverage (GPS only) and thus allow me to download offline maps. Paid app is OK. Must Have features: ...
2
votes
2answers
89 views

Measure my Cats movements , Accuracy of Mobile phone GPS at metre scale . how to improve it

I wanted to get some information related to an idea I have I have a lot of cats and a big garden. The cats generally roam through the garden and this location is fixed and Known If i have known ...
6
votes
3answers
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 ...
0
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0answers
28 views

Is it possible to use GPS navigation with track up in QGIS 2.8

Can we have a rotating map while navigating with a GPS so our track is always pointing up? Just like a car GPS
-3
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0answers
24 views

i am facing problem to understand data string? [closed]

i am getting following string from gt 02 on my server *HQ,356823035258834,V1,000000,,2839.6228,N,07708.8711,E,0.00,0,000000,FFFFFFFF,194,65, db,f817# Could any one explain the string?
1
vote
1answer
44 views

What is a good, small GPS data logger that stores accuracy information?

I'm looking for a small GPS data logger for geotagging photos, and I've had trouble finding one that meets my requirements: Small, key-fob size would be ideal. It should also store its tracks on ...
0
votes
0answers
10 views

itinerary import on GPS application (iOS)

I'm looking for an iOS application that could import an itinerary from a gpx of itn file (or whatever if itinerary is as easy as with google maps). I don't want just locate myself compared to my ...
1
vote
1answer
286 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 ...
3
votes
1answer
182 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 ...
0
votes
1answer
243 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 ...
0
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0answers
6 views

Playing multiple gx:track in Google Earth

I would like to be able to play multiple gx:track in google earth. I can play a single gx:track using the time animation but now I want to add multiple gx:tracks For example - GPS data from two ...
0
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0answers
9 views

not able to convert new GPS coordinates using feet [duplicate]

My known latitude is 46 deg 59' 9.6" What would my new latitude be 165 feet north of the known latitude?
0
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1answer
40 views

GPX-Tracks are not displayed correctly by many applications/web applications

I have a problem regarding GPX tracks that were created from Shapefiles using QGIS. The shapefiles were created by selecting all parts of a route from a PostGIS database. The polylines were merged ...
1
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0answers
25 views

Discrepancy between importing same data from CSV and GPS [closed]

I have been importing similar data by using two different methods: Entering the coordinates manually in excel and save as CSV, then importing in QGIS through delimited text layer. Column A is name, ...
0
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0answers
37 views

How to display tracks on a layer with lat and long in Openlayers

I want to show a track on my map. I tried the below code but the problem is I don't want to load the track points in the layer from the GPX File (because I don't want to generate a file from ...
1
vote
1answer
38 views

import GPGGA data to google earth

I have collected some GPGGA data in *.GPS file. Now how to import these GPGGA into Google Earth Pro.I want to see the result(lat, longt and height) in map. The file is opened like that: ...
1
vote
2answers
431 views

Difference between Positioning and Localization

I would like to know what are the differences between Positioning and Localization. In most papers they are used interchangeably. Are they the same? Does one come after another? I always thought ...
1
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0answers
33 views

Data Collection Solutions

I am seeking a new data collection software for a team of biologists who track migrating animals from planes through aerial telemetry. I currently use Delorme TOPO USA but when collecting point data ...
1
vote
1answer
34 views

Can I capture shared vertices with a Trimble GPS?

I'm trying to figure out how to use Trimble GeoXT and GeoXH GPS receivers to efficiently capture small farm fields in rural areas. The main issue that I'm struggling with now is trying to deal with ...
1
vote
2answers
66 views

Finding number of trips in each segment of road

I have street line layer for a city. I also have a lines travelled by the vehicle, which was created from the GPS points collected in the study (OBVIOUSLY, the path of vehicles are not accurate, so ...
0
votes
0answers
10 views

Wrong TimeStamp from GPRMC

Using a Quectel l80-m39 GPS the output TimeStamp from GPRMC (NMEA data format) string is not correct at times, but Longitude and Latitude is giving correct path. Why it is happening? How to overcome ...
4
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3answers
72 views

Is there a service to check whether a gps path belongs to a public road?

I have a bunch of GPS tracks. I want to exclude the ones which go via public roads. I'm interested in off-road segments only. Is there any public api to check if a given set of coordinates belongs to ...
1
vote
1answer
35 views

Will external antenna on handheld GPS improve location in a forest?

I want to improve the probable accuracy of waypoints that I collect during vegetation surveys on foot, where the canopy is overhead and continuous. My handheld receiver unit is a Garmin GPS 60 ...
1
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0answers
53 views

Deriving length values from GPX files in QGIS

I’m missing something real obvious and I apologize for revisiting a topic addressed in several Q&A’s here. I’m an experienced GIS user (not programmer) who’s new to QGIS (can’t afford Arc in ...
6
votes
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 ...
2
votes
4answers
974 views

How to clean/edit GPX (tracks) files recorded from GPS device?

During a long trip, I have recorded tracks of my journey with the GPS of my smartphone. I have ended up with about 30 GPX datafiles. Now that I am back, I am trying to draw a map of this trip. I ...
0
votes
2answers
41 views

Is newer better? - should I replace my 2008 model Garmin GPS60 handheld GPS?

I use my mid-price Garmin GPS60 handheld GPS device to record waypoints for vegetation surveys and other field surveys, often under tree cover. In asking 'should I replace my old unit', I should say ...
7
votes
4answers
3k views

Garmin etrex raster maps support

I currently use an excellent set of printed topographic route maps for mountain biking. I would like to scan the maps, georeference them, and upload the maps to a handheld GPS device. Does the etrex ...
2
votes
0answers
23 views

Trimble pathfinder data dictionary default value exclusion

Is it possible to have a numeric attribute in trimble pathfinder without having to use a default value? I am trying to make a numeric attribute compulsory to fill in BUT because the data dictionary ...
2
votes
1answer
89 views

Are latitude and longitude observations independent of each other or correlated?

I want to develop a bivariate gaussian kernel in order to handle the random noise in my GPS tracks where each point has three parameters (lat, long and time stamp). I was wondering if latitude and ...
0
votes
0answers
42 views

Trying to convert GPS LatLng Android coordinates to use in ArcGIS rest - esriMeters

I am getting the LAT and LNG position from Android. Both values are of type double, in Degrees. For example: NY, USA Latitude: 40.7142700 Longitude: -74.0059700 Then I have a service ArcGIS REST. It ...
5
votes
2answers
16k 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 ...
0
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0answers
46 views

How many calculations are needed?

I am working currently on a small e-learning project at the university for a professor. Now I am not an expert or anything in this field, I just learnd what I know online from the various sources and ...
6
votes
3answers
599 views

Using PROJ.4 library to transform from local coordinate system coordinates to global coordinate system using ground control points?

I have a point cloud whose coordinates are with respect to a local coordinate system. I also have ground control points with GPS values. Can I convert these local coordinates to a global coordinate ...
1
vote
1answer
236 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 ...
1
vote
1answer
361 views

Automating the production of GPS-compatible map tiles from georeferenced raster maps

I have a set of TIFF maps that I want to load onto Garmin GPS 62s units. The maximum size for each tile on the GPS is 3Mb and less than 1 million pixels. I manually produced one tile, following this ...
1
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1answer
275 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 ...
2
votes
1answer
32 views

What is “gps on demand time injection”

Android defineds a GPS device capability I couldn't find reference to It's defined as GPS_CAPABILITY_ON_DEMAND_TIME in gps.h The description in the comment explains: GPS on demand time injection. ...