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

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13 views

Direct access to DGPS data in QGIS?

I'm heading out to the Arctic Circle (Spitsbergen) I have a Sokkia DGPS and Magnet on a tablet device (connects to the DGPS and logs the data), they connect via blue tooth etc. Can I bring the data ...
2
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1answer
222 views

Trouble Converting from a shp. to gpx file and up loading to GPS

Currently I have a series of random points within a shapefile that I would like to upload to my GPS. Every time I try to upload the points via "Save file" it come up with an error message (posted ...
0
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1answer
207 views

Creating custom maps for Garmin Oregon 600

I have a Garmin Oregon 600 GPS receiver and a map I made in QGIS. Where can I find a step-by-step guide to getting this map onto my GPS unit? A static JPEG or PNG map is fine since I'm not interested ...
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1answer
394 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; however,...
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0answers
11 views

QGIS Plugin -> QgsVertexMarker points missing: Anyway to find out which points are not visible?

I am trying to plot live feed of three GPSs running at 10 hz using my own QGIS plugin. I was using QgsRubberband initially which worked fine. I recently added QgsVertexMarker to plot every data points ...
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26 views

How to crop orthophoto using GDAL

I have orthophoto(GeoTiff) and 4 GPS coordinates that represent rectangle. How can I crop orthophoto by using GDAL? (I need to remove areas outside of rectangle) UPDATE: I tried gdal_translate ...
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7 views

How to extract GPS data from video stream

I just got a Garmin Virb Elite video recorder and recorded some videos with it, and also confirmed that Garmins own player can show the GPS information on a Map. This video recorder stores GPS data ...
2
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1answer
255 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 X,...
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41 views

qgis v2.10.1-Pisa live tracking with gps save track as shapefile

I am using qgis with gps information and a usb gps. within gps information > options > digitizing I have checked the box for "Automatically save added feature" and Track > "Automatically add points". ...
2
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1answer
303 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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0answers
9 views

find the format of GPS string in c#

I am developing a AVL system using c#,My avl doesn't have any datasheet or guide,so from my gps i get this data every 20 second string aaaa2 = "24-42-10-10-03-31-05-16-03-15-07-16-35-45-...
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4answers
1k views

Android devices and apps with support for Galileo positioning

While the European's Galileo positioning system is only expected to be fully deployed by 2020, the first positioning made using already deployed Galileo satellites was made back in 2013. Also, ...
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16 views

GPS data can't be read when the device is moved

I am getting data from avl system as you can see with this format : *HQ,4106016320,V1,090458,A,5257.4318,N,15840.4221,E,000.00,000,101115,FFFFFBFF,250,01,0,0,5# As you can see the data that I get ...
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1answer
36 views

Establishing DGPS Connection With Old Equipment?

I am trying to do a differential surveying project with some outdated equipment, specifically: -An old AllegroCX personal handheld computer (Win 4.1) with SurvCE loaded on it to collect data and ...
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1answer
195 views

Which tools integrate Leica zeno 5 gps handhelds into ArcGIS?

What other software can I use with my Zeno 5 gps handheld device from Leica geosystems except the one they offer that integrates with ArcGIS desktop? They suggested the 'Zeno office' and the 'Zeno ...
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1answer
2k 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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2answers
457 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
1k 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 ...
3
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1answer
128 views

Find gravity normal by ECEF or GPS coordinate of point

How to find gravity normal by ECEF or GPS coordinate of point? Is it the same as normal to elipsoid? Is this ordinary way to calculate normal to ellipse? I'm not quite sure which altitude is ...
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0answers
60 views

QGIS : How to add points from GPS stream data

I try to place points on QGIS using the GPS plugin but it does not like me. GPS stream is good, I have the read on the data on port com 66, QGIS seems to be good with it since it locates correctly ...
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0answers
14 views

How to make multipart polygon shapefile in DNRGPS

How do you save multipart polygons from DNR GPS? I have read the short blurb under "roll up tracks" at this link, but either it is not clear, or I am misinterpreting it. When I follow these ...
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1answer
37 views

Sticking GPS waypoints to closest road?

I am new with QGIS. I want to study the performance of different GPS receivers, and to do so I need to compute the error made by each one. The problem is that I don't have any reference to be ...
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0answers
23 views

How to use ST_ClosestPoint [duplicate]

I am new using a GIS software. I have to study the performance of some GPS receivers by computing its positioning error. To compute the error I need a "reference" set of positions to be compared ...
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1answer
32 views

What will post-process differentially correct raw Bad-Elf Surveyor U-Blox NMEA/raw UBX?

I have a Bad-Elf Surveyor unit which claims accuracy ~1m when post-processed, but I am at a loss to find software that can differentially correct the raw NMEA/UBX logs that the unit will record. I ...
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1answer
27 views

Using multiple satellite constellations (e.g. GLONASS, GALILEO) by GPS unit?

I am trying to do research on GNSS/GPS units available and it seems like there is a large price jump for units with more satellite constellations (maybe I am erroneously making this correlation) that ...
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2answers
117 views

Method to determine a person's city/state using location coordinates?

I am working on data-mining project where I have to map a bunch of tweets to US states. I can get the lat/long coordinates from the tweet json, but I am not sure if it is possible to map those ...
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1answer
21 views

Tracks in a GPS file format

How to fill a file with different GPS tracks so that when opened in a GPS track viewer the tracks appear simultaneuosly as different tracks? What GPS viewers do that?
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1answer
43 views

Displaying current position using QGIS?

How can I display my current position in the QGIS canvas, similar to the "blue point" in google mapsa? I need this to navigate to defined points and I do not want to change the program all the time.
5
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1answer
300 views

Odd, old coordinate formatting from 1997 GPS

A typical coordinate is given as 68 35 067 N 123 54 817 W. I thought maybe some old timers could help me out. The author says in his report of the time that they were using a GPS, but I contacted ...
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4answers
62 views

Transfering topographic map from ArcMap onto Garmin GPS?

I have a Garmin 64S GPS unit that I'd like to get a topographic basemap layer onto, so I'm not wandering with a blank screen while getting to my field sites for my research. I'm using ArcMap 10.3.1, ...
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1answer
178 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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453 views

Exporting offsets from Trimble Rangefinder? [closed]

I already asked this question at http://www.rpls.com/forums/viewtopic/8/1276880, but didn't get any answer so far. We have the following Trimble devices: GPS Pathfinder Pro, Handheld with TerraSync ...
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1answer
37 views

Data Transfer not working, Files to Pathfinder another way?

Typically I would use the Data Transfer Utility to retrieve files from my Trimble Geo7x and run them through GPS Pathfinder to create usable shapefiles. Currently I cannot get the transfer utility to ...
2
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3answers
9k views

How can I manipulate the timestamps in a GPX file?

I have a GPS tracked stored in a GPX file. Now I'm looking for a tool that allows me to set the start time of the track and the duration, and the tool should automatically evenly distribute the ...
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2answers
41 views

preparing GPS coordinates for processing in gis

I'm currently working on a masters in archaeology, using QGIS to examine some palaeolithic sites. I created a database with the site coordinates, which I collected from looking at bibliographies of ...
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0answers
27 views

Improving Trimble GPS Pathfinder Office and TerraSync coordinate systems workflow?

We have GPS survey projects all over the country (CONUS and OCONUS) and I am wondering what the best practice is for having to deal with multiple coordinate systems. I can go from WGS84 UTM 18N meters ...
2
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1answer
54 views

Is Coarse / Acquisition PRN pseudo random code value hardcoded into GPS receiver?

From what I read there are 37 ( 1-32 are for traditional GPS code 33-37 are reserved for other use and ground transmitting ) carefully chosen pseudo random sequences 1023 bits long called Coarse/...
2
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1answer
231 views

Reaching cm (inch) level elevation precision using drones

A road construction firm needs altitude data of road path before and after the construction and the error should be less than 3 cm (2 inch). Normally, they put a ground station and workers manually ...
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1answer
141 views

How to measure RTK accuracy of a moving vehicle?

I am currently working with tractors using a RTK enhanced automated steering system. One of the biggest problems is that even RTK can have a inaccuracy of 2cm. This can be too much for some possible ...
0
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1answer
71 views

develop own mobile app connecting with external gps receiver

I want to develop a mobile app that can use external GPS as source for collecting high accurate point. And I just found how to connect Trimble R1 or Trimble R2 to android device using bluetooth based ...
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0answers
19 views

Using QGIS like ArcPad to average coordinates from GPS reading for point feature?

I have been able to sync my SXBlue GPS receiver to my tablet with QGIS via the GPS Information Window / bluetooth. I can view our coordinates, PDOP, etc and want to create a point shapefile that ...
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2answers
201 views

Compass Navigation With ArcGIS SDK for iOS

There's a sample provided by esri named GpsSample (I can't find a way to upload it here) Anyway, the sample includes multiple selections for mapview's locationDisplay autoPanMode property I'm trying ...
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3answers
60 views

QGIS 2.12/14 Add GPS Point missing geography?

I am trying to use the integrated GPS module from QGIS to add data points to a shapefile while in the field. I managed to get the connection between qgis and the gps working and my location is shown ...
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1answer
36 views

Sunlight based on GPS coordinates and UTC+date

I'm trying to create a sunlight map. I found the following question: Sunlight layer into CartoDB However, my interest is in trying to calculate the amount of sunlight manually. Can you please point ...
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3answers
58 views

Is there a correlation between the absolute errors of nearby GPS receivers?

Suppose I have two different GPS receivers located x meters apart and their exact location is know. Then, would there be a correlation between the absolute errors of nearby GPS receivers? By absolute ...
2
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1answer
142 views

How to prepare and upload points/lines to GPS using QGIS 2.8

I would like to upload some points (e.g. locations of transmission towers) and lines (e.g. streams, roads) in .shp format to my Garmin Oregon 600, using QGIS 2.8.2. Could anyone provide with step-by-...
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29 views

Problem in layer overlapping (qgis)

I want to plot gps pts on qgis (version 2.14.1). I have added the vector layer of SE Asian countries, and added the delimited text layer of my gps pts which included species name, lat and lon. ...
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1answer
45 views

How close can a commonly used GPS device come within actual location of target

With resepct to meters/feet how close will a GPS device get me, say if device (like iPad), is "common". Say, could I upload a particular coordinate that has two-tree houses in my back yard and discern ...
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0answers
36 views

How to count near intersecting polylines and merge them?

I have a dataset with several polylines created by GPS points of car trips. I am trying to create a simple heatmap where roads with more traffic (where polylines intersect) get darker. I already ...
3
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1answer
51 views

How can I stream attitude (roll,pitch,yaw) into Google Earth?

I am streaming position data (lat, lon) of an airplane into Google Earth via NMEA 0183 ($GPRMC, $GPGGA sentences) and it works OK (I generate and stream these from my own software). Now I would also ...