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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1answer
125 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 ...
1
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0answers
46 views

GPS point elevation vs Contours layer elevation

I have some survey grade GPS points whose elevation is approx 55 feet lower than my contours layer elevations. I am using 1 ft contours and comparing point elevations with contours in the same ...
1
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1answer
1k views

Using Python to compute the distance between coordinates (lat/long) using haversine formula and print results within .csv

I have a .csv file with 3 columns. The first column is titled Distance and it is empty. The second and third columns are titled Longitude and Latitude which contain coordinates, for example: ...
1
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2answers
218 views

how to display movements of a moving object in cartodb

I have few GPS tracks with lat long and timestamp. I want to present them on a map and to show how the movement took place using the time series location values (X,Y,T). I searched a lot but could not ...
0
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1answer
353 views

GPS tracking data string format for GRTQ device

I get GPS data from tcp (php socket), but for some devices (GRTQ) I will get an unreadable string. First devices sends: ...
0
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0answers
27 views

How to find the most accurate street/road by a given coordinate and some previous locations?

I'm building an application that gets user's position and tracks its changes while driving providing some information stored in shape file. To get the most accurate information from this shape file ...
1
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0answers
20 views

Metrics and features for comparison of aggregated trail dataset

I have hundreds GPS traces generated by cars for single road in the city from direction A to B. And I have hundreds of GPS traces generated by people which organized in trail in the mountain from ...
1
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1answer
84 views

Separating disjoint GPS path segments in Postgres

This involves a lot of code; if it's better suited for StackOverflow, please let me know! I'm working on a project involving trips that are constructed from GPS coordinates. I'm mapping the recorded ...
6
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2answers
422 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 ...
0
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0answers
37 views

2 Lat/Long Segments Defined By 4 Lat/Long Points - Calculate If They Intersect & How Far Along Segment They Do

I have 2 lat/long segments defined by lat and long end points. For example, I have Segment X (defined by A.lat, A.long and B.lat, B.long where A and B are end points) and similarly Segment Y (defined ...
3
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1answer
404 views

Using GPS tracking with QGIS and Panasonic Toughpad

I'm using QGIS with a Panasonic Toughpad FZ-M1 with inbuilt dedicated GPS. I can connect okay to the GPS using View --> Panels --> GPS information. Satellites and signal strength show up, but no GPS ...
0
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0answers
70 views

Ionospheric pierce point location

I have a question regarding a parameter used in ionospheric modelling - ionospheric pierce point (IPP) and its projection on ground, subionospheric point (SIP). For ground-based GPS stations, I ...
7
votes
1answer
177 views

Approximating GPS coordinates for a point from n expected locations

I'm trying to find the coordinates of my point of attention (point X,marked blue). I used the GPS device of my car to collect the coordinates according to where I parked my vehicle each time I visited ...
0
votes
1answer
35 views

Garmin GLO Accuracy in Saudi Arabia

How accurate is the Garmin GLO in Saudi Arabia. I know they mention a 3m accuracy but is it achievable in Saudi Arabia. And is there a way to increase this accuracy. I require it to be around 0.5-1m. ...
11
votes
2answers
175 views

How to anonymise a gps file?

Imagine you have a GPS trace that you want to make anonymous, in the legal sense. How would you do this? Is snapping to the nearest x distance and stripping out the time enough? Are there ...
1
vote
0answers
310 views

Updating OSM map from within PhoneGap/Cordova App

I am trying to build a sat-nav application that allows the users to dynamically update the map that their application is using. So if the user updates the map with a new road then that road is ...
0
votes
1answer
113 views

NMEA-2000 Message 129540 (“GNSS Sats in View”): SNR field is integer or decimal?

If you're familiar with the older NMEA 0183, there was a "GSV" record for reporting information about GPS satellites in view, including their SNR (signal-to-noise ratio, also known as ...
0
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1answer
47 views

Hand-held GPS to which I can upload imagery and shapefiles?

We've been struggling with Garmins. We can upload imagery and data using a phython script to create a KMZ file then drop it onto the GPS. It kind of works (much better on the newest units, barely on ...
1
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0answers
27 views

Vector file with photo direction arrow

I need to make a shp file with photo points incuding link to each points photo and at the same time should each point have an arrow pointing in the direction the photo is taken. As the photo ...
0
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0answers
88 views

GPS parity algorithm for RTCM messages

I hope this is the right place to ask such a question. I am trying to encode some RTCM messages and they happen to be using the same parity algorithm as GPS (see section 20.3.5 in IS-GPS-200H; I've ...
3
votes
6answers
3k 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 ...
4
votes
1answer
83 views

Need to include GPS data in a GIS system

I work for a small telematics company and we received a request from one of our clients about integrating their vehicle GPS locations to their ArcGIS system. Our current system simply displays this ...
0
votes
1answer
399 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 ...
3
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2answers
414 views

Does GPS correct for continental drift?

Does GPS correct for continental drift, and if so, how? (I'm mainly interested from the perspective of consumer devices such as smartphones.)
2
votes
2answers
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 ...
3
votes
1answer
326 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 ...
2
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0answers
35 views

Capturing GPS coords in EXIF header for JPEGs with ArcPad ImageBox control?

Problem with capturing GPS locations in EXIF header for JPEG photo using Esri's ArcPad and its ImageBox control. I have customized forms for ArcPad. I have added three ImageBox controls to a form ...
2
votes
2answers
489 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 ...
3
votes
1answer
323 views

Access Trimble GPS on ArcGIS Engine App

I have a Trimble Yuma tablet running Windows 7. I need to build an application that allows viewing of points on a map and editing of a geodatabase (feature layers and tables). I'm hoping to use ...
1
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0answers
76 views

Show multiple points and lines in Garmin GPS Map

I have two shapefiles that contain (1) 30 point features and (2) an extensive road network (line features) that connects them. I would like to show all data at once in the mapview of my Monterra ...
-1
votes
1answer
57 views

How to choose GPS setup? [duplicate]

I need some advice on choosing a GPS setup to map estuarine habitats in the field. Our SA estuaries are often very narrow (1 to 2 km wide) and habitats are small. We distinguish between supratidal ...
4
votes
2answers
317 views

gpspipe returns correct timestamp, but wrong date (21 dec 1995)

I'm having this strange issue where my gps pipe is returning the correct location and time but the wrong date (including year). For reference, at the time of writing it is 06 aug 2015, 09:27 UTC). ...
2
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0answers
44 views

Are there methods of filtering gps-data with metadata?

In our project we captured GPS-tracks from a few electric vehicles in the timeframe of a year. In total we captured around 13000000 GPS-points this way. The captured data comes from electric powered ...
2
votes
1answer
96 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 ...
1
vote
1answer
103 views

How estimate or get the value of PDOP from HDOP value?

I have a gps device that are reporting me the HDOP value and the number of satellites around, but I have as requirement to get the PDOP also, the GPS device doesn't give that value. Can I get PDOP ...
2
votes
2answers
467 views

Bind GNSS receiver with android app over bluetooth

I'm looking to integrate a GNSS receiver with a Smartphone app. I've found only GNSS receivers that are meant to communicate only with their mobile interface, they don't provide any documentation for ...
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0answers
46 views

Recommended GIS/GLONASS chip? [closed]

As a cyclist, I ust satnav extensively, whether for riding around the city or travelling. My Galaxy Nexus smartphone isn't very good at GPS, while my GPS+GLONASS-equiped Nexus 7 tablet (second model, ...
0
votes
0answers
28 views

How to fit gps trackings to a line with a known heading?

I have gps trackings that I know they fall into a certain pattern - a line with a known heading. How do I find the line that minimizes the distances of the points from it but is in the correct ...
0
votes
1answer
68 views

GPS points of a vehicle snapped to a specific polyline path [duplicate]

So I have been capturing bus GPS locations for a while now, and I am became interested in snapping them to their corresponding polyline (route). While at first this seemed like an easy enough task I ...
2
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0answers
33 views

match noisy GPS data to closest linestring in road network [duplicate]

I have some noisy GPS data(Points) that they are not exactly on the road because of the noise. But I want to match them to the closest road linestrings. How to do this in PostgreSQL? Data: ...
1
vote
2answers
3k views

GPS units compatible with Galileo

It seems like after lots of initial problems Galileo project is taking off (ESA, BBC). I was wondering what the state of preparation for that is on hardware side. Are there any consumer grade GPS ...
23
votes
2answers
28k views

Differences between triangulation and trilateration?

Looking around I noticed that many people interchange the terms (triangulation and trilateration) for the same sense. What is the correct sense of Triangulation and what are the differences from ...
1
vote
1answer
140 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 ...
2
votes
2answers
4k views

PostGIS convert geography(Point,4326) to GPS

I got a database with a column of type geography(Point,4326), the data contained looks like 0101000020E610000092E057F66EF73140930035B56CBD4840. How can I convert it to GPS coordinates?
0
votes
1answer
350 views

Yandex Navigator / Maps - Determining user location

Kindly redirect me to a more appropriate forum in case there exists one. I am an active user of Yandex.Navigator App (available for all kind of mobile platforms). Whenever I open the App, even though ...
2
votes
2answers
108 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 ...
2
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0answers
635 views

Can I put a button that automatically inputs GPS coordinates into a google form? (or other spreadsheet populator)

I am currently creating a Google Form and part of the questionnaire requires the user's current GPS location. Is it possible for a button to be able to do this and automatically populate the field? Or ...
2
votes
1answer
337 views

Computing the elevation angle of a GPS satellite with respect to the given receiver location

can anyone source an explicit formula for calculating the elevation angle for a GPS satellite as seen from a receiver. I can't seem to find one. Even a text reference would be great. I couldn't quite ...
2
votes
1answer
51 views

Base station correction process

This concerns post-processing via base station correction in Pathfinder Office. I understand the base station is a known location and the GPS receiver's location is corrected relative to the base. I'm ...
2
votes
1answer
82 views

Trimble Pathfinder Differential Correction: ‘Uncorrected’ for block of GPS data

I’ve been collecting GPS point data without problems over the last few months. Recently, on two dates, after using Pathfinder differential correction, the exported records’ Corr_Type changed from ...