Questions tagged [gps]

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

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88 views

viewshed analysis for GPS satellites

I have raster DEM and observer points (satellites) both are in the same coordinate system.The observer points are scaled down so that they are not very far away from the raster DEM (say at 500-800 m ...
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95 views

QGIS shapefiles to a Magellan GPS [closed]

I've got some shapefiles that I want to be able to turn into maps on a hand held GPS (Magellan Explorist 350H). So far I've had no success trying to convert the files to gpx and upload that way. I've ...
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1answer
80 views

Seeking “path averaging” algorithms?

Imagine that I have collected a large set of GPS tracks of objects moving from A to B, and for the sake of simplicity assume they avoid obstacles in a consistent way, so that their path is just "noisy"...
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1answer
4k views

Mapping GPS coordinate from Google Maps in QGIS

I have a number of addresses that I would like to map as point data (along with attributes) in QGIS. I got the GPS coordinates from Google Maps, but when I create the layer from the table, the points ...
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1answer
161 views

How can I convert these coordinates to decimal degrees

We have extracted the following coordinate set from a Microsoft SQL database, but are unable to convert it to a coordinate system that makes sense. We know that the coordinates should be in Cape Town, ...
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0answers
572 views

Record a GPS track in qfield?

Okay I can't figure out for the life of me how to log a live GPS track in qfield. I can add points and draw polygons, both of which are useful, but how does one track? I am trying to use qfield to ...
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990 views

Want to access android location services in a leaflet.js project running in a webview

I am running leaflet.js project on my android app using a webview. Everything is great but for current user location leaflet uses GPS because it runs in a webview and as we know webview is extention ...
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2answers
436 views

Using Android phone as gps?

I need to do a field mapping and i already have the grid (points). I need to put this points in my phone and use my android device to find this points in the field. I won't have any internet ...
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67 views

Urban positional accuracy of Google Streetview [closed]

How does Google Streetview have accurate locations in urban environments, such as in tunnels, below buildings and next to buildings?
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0answers
120 views

Position of vehicles relative to lead vehicle

I have a set of vehicles (think railway) that are in a (semi)fixed formation. I know the lead vehicle and I know the GPS coordinates of the lead vehicle at any given time. Sometimes, I can rely on the ...
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1answer
316 views

PPP GPS Understanding Messages

I have set up a Raspberry PI with a RasPiGNSS GPS-Module. After some binary convertion I get the following RINEX(ftp://igs.org/pub/data/format/rinex210.txt) files. .nav .obs .sbs I'm a little ...
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2k views

How do I get a .csv file of thousands of GPS coordinates along a stretch of a highway? (GPS Trace?)

I need a large amount of [latitude, longitude] data points along Texas' I-35 from Hillsboro to Salado. Essentially need a GPS Trace with minimum ~1,000 points.
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2answers
3k views

Merge consecutive GPX tracks?

Is there a (Windows) application that takes multiple, consecutive tracks, and merge them into a single GPX file? I tried deadware "GPS Track Editor", but neither Merge nor Join did the trick:
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1answer
627 views

Why are there so many different coordinate systems? [closed]

Why is there not a standardized system worldwide or at least one per country? It feels such an inefficient process to have to identify what a particular coordinate means, but perhaps there is a good ...
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2answers
461 views

rtklib DGPS error no nav data

I want to post-process GPS files via Differential processing (DGPS/DGNSS mode) using rtklib (http://www.rtklib.com/). I have rover and base observations in .rinex format. I took FINAL satellite ...
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2answers
1k views

Does GPS usually use more than 4 satellites for a 3D fix

In reading around it seems clear that 4 satellites are required for a 3D fix, and while it is often stated a GPS chipset will track more than 4 satellites, literature often implies it will only use 4. ...
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0answers
168 views

Determining Bounding Points of UAV Images

I know the EXIF data from drones contains the GPS point central to the photo to provide photo location. What I'd like is to determine the lat/lon of the four corners of the image. I've done a pretty ...
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1answer
6k views

Trying to find my GPS corners on property [closed]

Based off the legal description Legal Description: TR IN 12-10-72 DESC: BEG AT NW COR, TH S 89 53' E 857.5 FT, S 0 3' W 1778 FT, N 89 53' W 857.5 FT, N 0 3' E 1778 FT TPOB CONT 35.0008 AC M/L..... I ...
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1answer
2k views

How to map fence post holes to reality?

I'm looking for a good technique to take points, which mark the locations of fence post holes, from a Google map layer to then precisely mark with paint where to drill the holes. I noticed that my ...
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1answer
589 views

Localisation on Leaflet JS

I am getting my Localisation on Leaflet map using the extension. Leaflet.Locate When I am on my local server it works fine like shown bellow: But when I am on a remote server I get this error. How ...
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1answer
142 views

Can I use avaraging to pinpoint the exact location of a stationary GPS device?

I have a simple Android app that keeps track of users' location, using the following setting of the LocationManager to avoid constant updates and thus battery drain minTime = 60sec (minimum time ...
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0answers
43 views

Joining multiple GPS traces to a road

I have multiple GPS traces (polylines) from cars. I would like merge them somehow to create roads. I don't have access to maps in this solution so basically I'm trying to create a poor man's map, with ...
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1answer
201 views

GPS Altitude uncertainty and postional uncertainty in Lat/Long [closed]

I'm working on flight sensors for a project and I'm supposed to model GPS device noise. I looked a lot for it online and could not get a convincing answer. I need the uncertainties of altitude and ...
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0answers
87 views

Utility of QZSS over India

I have noticed with two mobile devices (Samsung S2+ and OnePlus 5) that the GNSS sensor picks up QZSS satellites (PRN 193 and 194 [only for OnePlus 5]), even while using these devices over Northern ...
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1answer
144 views

Fast(est) way to detect if point is in range of another point? (Geographic Coordinates)

I'm looking for a way to detect if 2 points are "near enough" each other for a match, and hopefully, if the range could be specified in metric system (each item may have different ranges, but there ...
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0answers
31 views

How do i implement GSM geolocalisation?

I am working on a project that might need to use GSM geolocalisation instead of GNSS. The problem is I have never implemented something like that. A lot of systems using this technology, seem ...
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1answer
426 views

Can't get RTKLIB to use an external geoid

I want to write the results of processing a Rinex file using geodetic heights, and an external geoid from Spain's geographic institute IGN. I have downloaded the geoid files from their FTP in text ...
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0answers
991 views

What is a Trimble .CAR file?

I have a field team using a Trimble Geo XH from 2008. My usual workflow is to have them email me the raw GPS files, which I copy into a "GIS Folder" for import to Pathfinder where I process it. I ...
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1answer
490 views

How can I find the average bearing using a set of zig-zaggy coordinates, knowing the user travelled in a straight line during that period?

Some background: I'm developing an app which uses augmented reality and GPS data in order to improve the True North accuracy of the device. Currently, iPhones have a True North accuracy of about 15º ...
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1answer
526 views

Distance between 2 3D points(GPS+altitude) in PostGIS

I have 2 points, look like: (lat,lon,altitude in meters). How can I get the distance between them? I saw only ST_3DDistance(geometry g1, geometry g2); But I don't know how to set points coordinates ...
2
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1answer
1k views

Cellphone GPS accuracy standards?

It's my understanding that in 2008, the US government published GPS standards for civilian applications (including cellphones) of rms 4m. Is it correct that this applies to cellphones? and Has ...
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1answer
208 views

Do latitude/longitude coordinates ever refer to “real” earth, not idealized sphere or ellipsoid?

I'm new to the world of geographic information systems. While trying to learn the basics of spatial reference systems, I wonder whether there is any situation in which we can have latitude and ...
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10k views

How to download Google location timeline raw data (red dots)?

So I downloaded Google location timeline history. However, this data is represented as a polyline with just about a dozen time marks (Figure 2). At the same time when I look at the Google location ...
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1answer
891 views

Sending Trimble GeoXH GPS data to an Android Tablet using Bluetooth

Has anyone ever successfully connected a Trimble GeoXH to an android device and consumed the GPS data? I have tried both Bluetooth GPS and Bluetooth GPS Mouse apps with no such luck. They both connect ...
2
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1answer
286 views

Height and X Y coordinates of points on Google Earth

How can I get information on height and X,Y coordinates using Google Earth data for a given terrain?
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1answer
279 views

Write time stamp for .gpx in R

I am in the process of editing gpx files and need to write the files back to .gpx in order to put them in a GPS unit. Basically, I am cleaning up some data and removing some track points. However, ...
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0answers
356 views

Plotting realtime .nmea files with QGIS 2.18.10

I am working on a project that requires us to track 2 GPS targets, one car and one weather balloon. The realtime GPS tracking of the car via the COM port works great. The decoded data from our weather ...
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2answers
1k views

Moving GPS points with distance + bearing [closed]

I have a list of 73 GPS points that represent animal observations. Each point also lists the bearing (angle in degrees) and distance from the observer to the animal. Instead of displaying each point ...
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2answers
300 views

Walking route that covers the largest area in shortest distance

I regularly need to walk across field searching for bird nests. The field are often squares or polygons and the bird nests could be anywhere on the ground in the field. To stand the best chance of ...
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1answer
166 views

Why is the CORS coverage density in the US is so high?

According to the data I found online, it appears that the density of CORS (Continuously Operating Reference Stations) in the US is significantly higher compared to other countries. Why? (NOAA ...
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1answer
1k views

Find the GPS coordinates where two boundary lines intersect

I have a detailed topo map for an irregular shaped property. It has boundary lines expressed like this, for example; S76˚45'08"W and S59˚38'24"W. The map also notes how long each boundary line is. I ...
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0answers
71 views

dnrgps converting images to waypoints

Help! I am downloading waypoints collected with our Garmin Montana 680t Software version 280. That works fine. Get a table of waypoints collected. The user also took photos which are geotagged with ...
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2answers
2k views

Latitude Longtitude to X, Y, Z coordinate system using python

does anyone know how to go about converting lat, long, alt to x, y, z where you have an origin for x/y coordinate (specific place in London)? In other words, I have a lat long and alt data and would ...
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2answers
736 views

GPS Elevation height

I want to calculate the height of an object based on nearest ground surface. I have GPS coordinates and GPS elevation(which I assume is ellipsoid height) as an input in WGS84 coordinate system. I read ...
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1answer
1k views

Bluetooth my GPS signal to windows 10 tablet using QGIS

Could anyone tell me how they pair their mobile phone gps to a (windows 10) tablet that can be picked up by qgis live tracking? I have tried a few apps which i believe is broadcasting the gps to my ...
2
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1answer
517 views

Total station data

I have data from a total station representing the various points on an archaeological site. The data is in an excel spreadsheet, and I have managed to import it into QGIS as a .CSV file. I also have ...
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0answers
358 views

Getting Latitude and Longitude using GPS Averaging app on android phone?

I am trying to get latitude and longitude of radio stations across my country (Liberia) using an Android phone. I downloaded GPS Averaging but I keep getting an error which says: NO GPS SIGNAL How ...
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1answer
276 views

GPS coordinates to OLEX

My goal is to convert gps coordinates to the format which the OLEX plotter has, so I can import them as marks. So I created a point at 64 10.239N and 51 41.523W I exported the point, and the file ...
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0answers
142 views

Estimate missing coordinates in a trajectory of points in Python

I have points with longitude, latitude and date, being the trajectory of a boat taken every day. One point is missing and I have to estimate it with Python. Is there built-in libraries doing that or ...
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1answer
573 views

OpenLayers 3 : Problem with the tracker?

I try to make a tracker with OpenLayers. The localization point appears well but not in the right place. <script src="https://openlayers.org/en/v4.1.1/build/ol.js" type="text/javascript"></...