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

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92 views

Seeking smallest device able to interface with GPS unit?

For GPS units that talk over USB, what's the smallest device you could plug the GPS in to in the field, in order to upload from the device to the GPS and download from the GPS to the device? Netbook? ...
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1answer
333 views

Transforming coordinates from WGS84 to Gauss-Krüger 5

GPS coordinates in the format of WGS84 are quite common. I need to transform them into Gauss-Krüger coordinates but I have no idea how to do that. The only things I know are that it is not easy and I ...
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0answers
2k views

Uploading Polygon Shapefile to Garmin GPS. How to View all Polygons?

I am trying to upload a polygon shapefile to a Garmin 60CSx unit. The polygon shapefile is a small area containing polygons of vegetation types. There are are 53 polygons (records) in the shapefile. I ...
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0answers
138 views

Summing time spent on effort from point GPS data tracks in grid cells?

I have one layer of point data representing GPS tracks collected during vessel surveys (an individual survey is indicated as the time between departing and returning to shore and there can be more ...
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0answers
34 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.
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2answers
1k views

Base station for RTK-GPS using RTKLib

First of all I would like to say that I am new to gis-se and as such I will try to comply as much as I can to your policy. That said I am actually doing a little project which as the title says ...
2
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2answers
765 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 ...
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1answer
63 views

Calculating distance to a fixed point on a map

I have a point with latitude 40.7127837 and longitude -74.00594130000002 I have imagined this point on a plane like this Latitudes run from West to East and longitudes run from North to South Can ...
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10answers
3k views

Device for Logging GPS and Accelerometer Data? [closed]

I am looking for a device that can track my location (lat,long) and speed all day long. Perhaps, I need GPS and accelerometer data bundled together. What I want to do is to log my daily activities. I ...
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1answer
361 views

Add GPS tracks directly to a PostGIS table

Disclaimer: I am a total GIS newb and I have a use case I have not seen elsewhere. Background: I drive country roads looking for old building, cemeteries, school houses, etc and I record the ...
2
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1answer
67 views

How to find records using a distance filter, in a table of Points?

My table fields are: POSIC (id, geom, dt_inclusion). DB is PostGIS. Data comes from a GPS Source, then i can create a route ordening the points by Date_Inclusion. So, lets say i have registries A,B,C ...
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0answers
66 views

Add telemetrics to gps file format

I've created my own data file using gps information and loads of sensor data. I'd like to create a gps file which will add this information to the geographic location. Unfortunately most common gps ...
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1answer
54 views

Set proximity requirement for ESRI Collector observations

I am trying to create a Collector map that allows field crews to update a "status" attribute for features in a feature class. What I would like to do is limit the features that can be edited by the ...
2
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4answers
907 views

ArcGIS Mobile that uses GPS location to route to a destination?

Does anyone know of an example of routing within ArcGIS Mobile 10 that uses GPS location to route to a destination?
2
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2answers
1k views

Making line from set of GPS points?

I need to create the trajectory of respondents according to the their collected GPS data (including X and Y). I am familiar with python programming, but I am a beginner in ArcGIS. I want to write ...
3
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2answers
558 views

What is relation- difference and/or similarities between PPP, SBAS, GNSS, RKT?

Recently i came across lot of terms such as IGS, GNSS, GPS,PPP, WAAS, EGNOS, GLONASS, CORS and many more ... I know some of them I can group them such as GPS, GLONASS, GALILEO . And then there is SBAS ...
3
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1answer
145 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 ...
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0answers
149 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" ...
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3answers
4k 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 ...
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0answers
62 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
239 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
75 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 ...
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0answers
73 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
20 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
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2answers
373 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
13 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?
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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
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1answer
894 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 ...
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1answer
129 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.
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5answers
2k 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?
7
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4answers
9k 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 ...
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3answers
393 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?
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0answers
26 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 ...
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0answers
19 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 ...
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0answers
163 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: https://www.google.com/maps/place/SoHo,+New+York,+NY/@40.7236448,-74.0006793,16z/data=!3m1!4b1!4m2!3m1!...
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0answers
24 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 ...
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0answers
48 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 ...
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1answer
2k 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: Distance,...
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2answers
243 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 ...
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1answer
394 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: *HQ,XXXXXX,41,4#V1,time,A,**Lat**,N/S,**Lng**,W/E,000.00,000,date,FFFFFBFF,432,...
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0answers
31 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 ...
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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 ...
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1answer
95 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 ...
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2answers
435 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
40 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
553 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 ...
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0answers
83 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 ...
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1answer
187 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 ...
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1answer
43 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. ...