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

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3
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1answer
77 views

Getting the compass point given longitude, latitude and direction in degrees

I have this data gathered using a GPS device No. Time Longitude Latitude Speed(Km/h) Compass point Direction (deg) 1 10/20/15 1:34 40.11724 -3.21032 11 Northwest ...
2
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0answers
133 views

How can a GPS receiver know the estimated error?

I would like to plot a circle of possible error on the map in a GPS app. From http://en.wikipedia.org/wiki/Dilution_of_precision_(GPS), we can see that GDOP is equal to "delta of output location" ...
10
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3answers
2k 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 ...
1
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0answers
49 views

Synchronizing coordinates from GPS to central server

I have developed a tracking system using a GPS device connected to a Linux box. It collects the coordinates as it progress. It's done with a python script, which is listening to the GPS device and ...
2
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2answers
137 views

Find country from GPS coordinates, offline using python

I'm aware that there are several similar questions already but I have been searching for days and not been able to solve my problem: All solutions I've found require GDAL, which I have not been able ...
2
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0answers
54 views

High-level method for offline future road elevation data

I am new to GIS, so please do not hesitate to call me out in providing limited information. I have a .tiff Terrain (elevation) data file for the east coast of the US and a .osm.pbf OSM file for ...
0
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0answers
45 views

Plot ENU points on a map having an origin GPS Lat and Long

I have a GPS coordinate point to denote my origin: 8.6258,47.3325 Then I have a series of ENU (east, north up) points in meters that represent the distance from my origin: -10, -1 //East, north ...
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0answers
19 views

Updated GPS coordinate shows rotated point

So I have a GPS coordinate: 8.6258,47.3325 Which I use as my origin. Then I have the path of an object that has been moving around based on the ENU position, say: -10, 12 //east, north in meters ...
2
votes
2answers
335 views

Loading GPS information into map and track waypoints?

I am using QGIS 1.8 in Ubuntu 12.04. I am working with Robot Operating System (ROS) and QGIS simultaneously. My ROS system is connected to LIDAR (sensors) that will publish GPS message so, I could ...
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0answers
12 views

Increment GPS coordinates by a certain distance given in meters [duplicate]

Say I have this point: 45.1200,10.5000 From there I want to create another point that is 20 meters north and 10 meter east from the previous point. Is there any equation I can use for doing this?
0
votes
1answer
32 views

Offline Playback of Vehicle in OpenStreetMap

How to do offline playback of routes traveled by a vehicle using postgis in OpenStreetMap when the coordinates are given in JSON format? I am getting gps data from gps device in json format but it ...
2
votes
1answer
820 views

Snapping Polygon vertices to Point features using ArcGIS?

I have a set of polygons drawn using an inaccurate GPS PDA. these polygons are sharing nodes. After post-processing GPS data to get accurate coordinates i have a set of all the nodes, then i have to ...
6
votes
2answers
24k 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 ...
-2
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1answer
60 views

Connecting Garmin GPS Device to ArcMap?

I Have a problem regarding connecting my Garmin GPS 18x USB to ArcMap. It is not working.Can you tell me any advice.
6
votes
5answers
1k views

Does the strength of GPS weaken in rural areas?

Does the strength of GPS weaken in rural areas? For example, based on how the satellites work, would the strength in the centre of Australia differ from a populated city in Europe?
2
votes
1answer
115 views

How to get all gps points on a road from osm data?

I'm trying to extract gps points on roads in a region. For each road, I need a gps point on that road every 10 meters. I'm aware that Google Map API offer such way points, but due to the ...
6
votes
4answers
7k 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 ...
1
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3answers
307 views

Does India Have a CORS (Continuously Operating Reference Stations) Network?

Does India have a CORS (Continuously Operating Reference Stations) network? If yes, can anybody provide more details about it?
0
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0answers
21 views

Trouble interfacing Garmin Foretrex 101

I have trouble interfacing my Foretrex 101 GPS unit using my Lenovo laptop through the vendor's PC Interface Cable. I suspect that this has to do with the virtual COM port setting (The laptop has ...
1
vote
0answers
18 views

How can I quantify whether locations of one 'type' are closer to one another compared to a second 'type'?

This might have an obvious answer but I'm new to GIS and can't seem to find the right technique... I've got GPS points for a bunch of households and have calculated the distance (in km) between each ...
0
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0answers
92 views

How to get GPS coordinates of neighborhood polygon from Google Maps?

Does anyone know how I can find the GPS coordinates for neighborhoods like this: ...
0
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0answers
19 views

Time Difference of Arrival

I am trying to implement indoor positioning system in Matlab. Does any one know any simple method to find the time difference of arrival.I have 6 references and one target.Need to find the time ...
2
votes
1answer
57 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 ...
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0answers
32 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
vote
1answer
610 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
vote
2answers
171 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
280 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
26 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 ...
25
votes
6answers
6k views

How to create a 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
0answers
16 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
vote
1answer
64 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 ...
1
vote
1answer
83 views

Calculating radius of curvature and banking angle when set of lat, long and elevation are given?

I have set of lat,long and elevation values with me. Can you help me find the Radius of curve and banking angle. Even if formulae are provided I will be grateful.
6
votes
2answers
408 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
31 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
196 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
41 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 ...
1
vote
1answer
350 views

How to extract GPS information from Garmin Cam 20 video files

I just got a Garmin Dash Cam 20 and recorded some videos with it, and also confirmed that Garmins own player can show the GPS information on a Map. I cant seem to find any technical information on ...
7
votes
1answer
152 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
26 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
139 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 ...
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vote
0answers
250 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
84 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
votes
1answer
41 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
25 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
64 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
2k 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 ...
3
votes
1answer
78 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
305 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
334 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
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2answers
7k 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 ...