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

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2
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3answers
8k 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 ...
1
vote
2answers
36 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 ...
2
votes
0answers
16 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
votes
1answer
46 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
votes
1answer
216 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 ...
3
votes
1answer
132 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
votes
1answer
53 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 ...
0
votes
0answers
12 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 ...
2
votes
2answers
190 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 ...
2
votes
3answers
56 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 ...
1
vote
1answer
373 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,...
0
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0answers
12 views

u-blox PPP Neo-6P and Neo-7P [closed]

I'm confused as to what PPP means for u-blox GNSS receivers. Both Neo-6P and Neo-7P are marketed as u-blox precise point positioning modules. For the older version Neo-6P, it is mentioned that u-blox’ ...
2
votes
1answer
211 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 ...
1
vote
1answer
32 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 ...
3
votes
3answers
48 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
votes
1answer
252 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,...
0
votes
0answers
20 views

Options for submeter grade GNSS receiver with bluetooth capabilities? [closed]

I'm a GIS intern at a civil engineering firm, and I've been tasked with looking for a sub meter gps system with Bluetooth capabilities in the range of no more than 5k to 7k, but preferably less. It ...
0
votes
1answer
193 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 ...
2
votes
1answer
129 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-...
1
vote
0answers
28 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. ...
2
votes
1answer
35 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 ...
2
votes
0answers
35 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
votes
1answer
34 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 ...
2
votes
1answer
301 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 ...
2
votes
2answers
443 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 ...
1
vote
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 ...
27
votes
6answers
7k views

Creating polyline-based “heatmap” from GPS tracks?

This winter I am planning to track my downhill skiing/snowboarding using a GPS. Most of my riding will occur at the same resort. I would like to be able to create a sort of "heatmap" that shows the ...
1
vote
1answer
47 views

How do I file a QGIS bug report through alternative means?

I have tried to file a bug report per the instructions on the QGIS get involved page. Signed up for an osgeo account, but keep on getting kicked off. It could be my connection (Wireless DSL, wildly ...
1
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0answers
19 views

Will GPS L2 make RTK more reliable?

I currently experiment with an affordable L1 GPS RTK system based on u-blox NEO-M8T with RTKLIB and higher quality patch antenna (with ground plane). I wonder what is the role of L2 signal in an RTK ...
1
vote
1answer
27 views

Attribute table Does Not Show Any Lat Long Field in ArcGIS for Desktop?

I had import shapefiles data which is a point features from GPS receiver. The points are well on pointed on the ArcGIS display, but when I open each attributes table, there is no field show the ...
1
vote
1answer
188 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 ...
1
vote
1answer
170 views

Analyzing long lat location data to find locations in proximity

I am looking for a tool to analyze location data (long lat values from vehicle GPS available). The goal is to identify locations which are in close proximity (within a circle of 30-60ft) and then ...
3
votes
4answers
783 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, ...
0
votes
1answer
14 views

Issue with a Leica RX1200

Just got handed a Leica RX1200 unit (which I'm not familiar with). When I turn it on it opens up the window/select program screen and almost immediately switches to a perpetual hourglass icon. We'...
0
votes
0answers
25 views

Looking for a web service to return landcover/landuse data based on Long/Lat

I am looking for an web based API to get location data based on Latitude and Longitude that will return landcover/landuse feature data for a mobile app. It will preferably return the data in a json ...
4
votes
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 ...
4
votes
3answers
116 views

How to evaluate performance of GPS/GNSS unit

I need to integrate some sort of satellite-based positioning for a mobile robot project. I am at the very beginning - I got 2 u-blox GNSS evaluation boards (these NEO-M8Ts) - I chose an integrated ...
0
votes
0answers
23 views

Working out meter accuracy based on number of visible GPS satellites?

I am working with NMEA data and I curious whether there it is possible to calculate the accuracy, in metres, based on the number of visible satellites or whether there is an alternative way? The two ...
16
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15answers
6k views

Mobile Data collection options

What COTS software is available to do mobile data collection, with GPS positioning. Map display not required. I'm looking across the board (platform wise). I'm already aware of... RhinoSpect ...
0
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0answers
14 views

How does distanceTo use accuracy in android.location.Location

I would like to know how exactly accuracy will be used in getting to know the distance with the build in function distanceTo(Location location). I have read everything in https://developer.android.com/...
2
votes
1answer
199 views

Is there an industry-standard official mapping of Galileo satellites to global "PRN”/ID values?

In the U.S. GPS system, satellites are identified by the PRN number broadcast by each satellite. This ID is usually visible on most GPS receiver platforms that provide access to individual GPS ...
3
votes
3answers
286 views

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

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 on-...
39
votes
10answers
57k 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 ...
3
votes
1answer
88 views

Satellites needed to receive proper 1pps signal

So I have read that you need 4 satellites to be able to get a proper position from your GPS. But how many do you need if you are only interested in the 1pps signal from them? And what effects play a ...
1
vote
0answers
46 views

Twitter live feed on ArcGIS desktop [duplicate]

I am a complete beginner with ArcGIS and I have been looking for a way to live feed tweets to ArcGIS desktop. A quick google search brings this blogpost up from 2009: http://blogs.esri.com/esri/arcgis/...
0
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0answers
8 views

What is the standard method of finding satellite positions in between the 15 minute intervals in an SP3 file?

SP3 files provide satellite positions for every 15 minutes. How would you find the satellite position at a time between two logged positions, i.e. 7 minutes after the last logged position? I can ...
1
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0answers
28 views

writeOGR R and add an icon symbol [closed]

I am wondering if there is a way to add an icon symbol to the R code I am using to export data in GPX format. In the navigation program I import the GPX file into all of the of coordinates are ...
0
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2answers
33 views

Proper handling in PostgreSQL/PostGIS only after many queries?

I am trying to analyze GPS data of a parade on a fixed route with a certain variance due to the urban surrounding (canyoning). I'd like to project the GPS waypoints to the nearest points on the route ...
2
votes
0answers
11k views

Key difference between NAVIC Indian Regional Navigation Satellite System (IRNSS) and American Global Positioning System (GPS)? [closed]

What's the key difference between NAVIC The Indian Regional Navigation Satellite System (IRNSS) and American GPS system? Radio Frequency Accuracy guaranteed Modulation Area Covered Engineering ...