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Questions tagged [gps]

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

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20 views

Seeking code sample or pointer showing how to calculate Corner Coordinates of JPG file based on EXIF GPS data? [on hold]

This is a follow up to this question: Using GDAL to extract Corner Coordinates based on a jpg file's GPS EXIF data? Per the answer I received to the above question, gdal_merge cannot merge JPG ...
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21 views

Converting GPS data to KML?

I have some waypoints, and I need to input them into Google Earth. How can I convert data from GPS to KML file?
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0answers
15 views

Does GPGGA have leap second correction?

I'm trying to use GPS clocks to synchronize some measurements and I'm a little confused about the leap second correction between GPS time and UTC. I was wondering - does the GPGGA NMEA header have the ...
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1answer
39 views

Decimal degree coordinates plotting incorrectly on basemap in ArcMap

I'm trying to plot some GPS coordinates onto the World Light Gray Canvas basemap, but they are not showing up near the correct location (Ecuador). I uploaded a shapefile for Ecuador which did show up ...
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18 views

GNSS Calculation techniques and Software implementation [closed]

The following is the thesis topic which i'm going to work in coming February - "State of the art of GNSS calculation techniques, current implementations in modules in the market. Study of feasibility ...
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1answer
39 views

QGIS live GPS data via internal GPS (Durabook, Windows 10)

I have a Tablet (Darebook with Windows 10) on which I installed QGIS (v. 2.8)  So I tried to do the "live GPS tracking" with internal GPS (Sierra wireless sensor). Next, from the menu of QGIS I went ...
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0answers
23 views

What is the sIgnificance of equator in GPS offset calculation?

I am going through a SAE document where it says that the GPS offsets (NodeLL) should be calculated in such a way that the range should be within one of these: ranges of +- 0.0008191 degrees ranges of ...
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1answer
36 views

Using remote controlled jeep to gather data points? [closed]

Is it possible to use a small remote controlled jeep or truck - 18" long or so - with some kind of GPS device attached to it to gather data for a detailed topo map of a 2 acre parcel that I just ...
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0answers
71 views

How precise is GPS?

Most search results I get on this talk about the accuracy, that is how close the locations outputted by the GPS are to the real positions, of GPS. However, I'm working on a project that only requires ...
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2answers
47 views

Identifying counties further than ten miles from bank using ArcGIS Desktop?

If I have the latitude and longitude of all US banks. How can I identify counties whose center is ten miles or further from any bank using that data?
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1answer
39 views

LiDAR data in GPS time, only in second. Missing week?

I have LiDAR data LiDAR Data captured, unsure what units or format this time field is in? which I learned that my LiDAR data is in GPS second, however I do not have a column of data which shows the ...
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1answer
34 views

LiDAR Data captured, unsure what units or format this time field is in?

I haven't been able to figure out or find out from searching around what units or format this time field is in my LiDAR data that was collected?
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18 views

Getting the position of satellites and the pseudo range or time stamps from RINEX file

I don't know if this is a stupid question, but I would like to calculate my position, based on raw GPS data (preferably RINEX). To do that, I need the position of 4 satellites and the pseudo-range to ...
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19 views

Is there a repository of Galileo Ephemeris data that includes corresponding calculated satellite position coords?

I'm trying to build/test an algorithm that will take Satellite-broadcasted Ephemeris data and calculate the Satellite's position/velocity based on a given time. It would be considerably easier to ...
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18 views

Force point creation in Trimble Terrasync

I'm wondering if it's possible to force/automatic nest a feature after the creation of another feature? We usually take 2 different points in one location but some of our employees forget to take the ...
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3answers
84 views

GPS waypoints are giving me different coordinates once transformed into proper coordinate system?

I recently went and collected some waypoints with a GPS that is in NAD27 UTM16N. After uploading the GPX file into QGIS, I saved it as an ESRI shapefile, and changed the CRS from WGS84 to NAD27 UTM16N....
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0answers
16 views

How to export a GPX that is ingestable by the ridecommand.polaris.com GPX import?

I am attempting to export a GPX file from a PostgreSQL line table to a GPX file using QGIS and/or OGR. And then upload that to https://ridecommand.polaris.com. For the most part, this seems to be ...
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2answers
76 views

Heuristic relationship between number of satellites and GPS precision?

I'm a statistician conducting an analysis on animal movement based on data collected using ATS Wildlink 500 collars. As part of this analysis, I'm estimating GPS error assuming that the error in the ...
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1answer
52 views

What is the practical limit for lat/long measurement accuracy?

There are several systems for finding lat/long coordinates. This includes GPS satellites, DoD TRANSIT, Russian GLONASS, Galileo, differential GPS, LORAN, land-based systems, and more. Maybe even using ...
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0answers
31 views

Pyqgis standalone - Matplotlib on QgsMapCanvas

Standalone mapping application: Is possible to plot a point like scatter of matplotlib on QgsMapCanvas object? I want to display my GPS current position without create a shapefile and edits it. ...
3
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2answers
380 views

Where does the Geoid information in a GPS unit come from?

In the NMEA GGA-message the 11th field is Geoid separation. How does the GPS-unit "know" this separation? Are GPS units preloaded with an EGM (Earth Gravitational Model)?
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1answer
43 views

Importing Several Latitude and longitude Points From a Smartphone App into a CSV File

I am using a GPS App on Android that export my location as a latitude and longitude values. For each location it exporting a separate data set: Latitude (LAT): 32.05796 N 32°3'28.6578" Longitude ...
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2answers
69 views

Calculation between Raw GPS data to latitude,longitude points?

I am working on the GPS related project. The objective is to understand the calculation process of the raw GPS data (server side calculation). It means " How did we get the latitude and the longitude ...
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1answer
107 views

GPS coordinates to XYZ on relative grid

This has kind of been asked before in different ways, but I'm struggling to adapt the answers to my specific scenario. Say I have a ground station and a plane in the sky. I know the GPS lat, lon, and ...
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1answer
70 views

FCC Galileo Waiver: What does it mean in practice? [closed]

Today the FCC approved the use of Galileo navigation satellites in the United States. According to gps.gov, The Federal Communications Commission (FCC) rules require licensing of non-federal ...
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0answers
29 views

Seeking API for reading RINEX file?

Is there an API service for reading and processing the RINEX file of GPS data? I searched online, but I was not able to find one.
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0answers
70 views

Very different static gps tests for different devices

I don't understand the results that I got when I measured with three different devices that were lying on the ground for couple of hours. These devices were: Nexus 10 tablet, Samsung Galaxy Core Prime ...
2
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1answer
27 views

Mapping local history

I have been working almost half a year now trying to create a modern digital map of the local towns protected historical silver mines. The only GOOD map over the mines dates back to 1794. A new map ...
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1answer
37 views

What are the available global GNSS corrections?

How can I find out what GNSS corrections are available in a location? For example, in the United Arab Emirates (24°03'22.8"N 55°46'42.9"E) what corrections are available to me assuming I have the ...
3
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1answer
47 views

GNSS accuracy, what is it?

Using a Trimble GeoExplorer 6000 Series GeoXT Handheld, I recorded uncorrected GNSS positions, for example: Horizontal estimated accuracy in the field 4 meters. Vertical estimated accuracy in the ...
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1answer
31 views

How to number my GPS points sequentially?

I want to number my GPS points from the first point to the final point, the first point is 1, second point is 2.... is there any plugin or toolbox I can use? I used the plugin (sort and number),...
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2answers
77 views

How to customize the appearance of OSM maps on Garmin GPS device?

Just downloaded my first OSM map onto my Garmin etrex 30x from http://garmin.openstreetmap.nl/. I always liked the extremly fine level of detail of OSM, as compared to other maps I know it contains ...
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1answer
44 views

Does longitude/latitude info come directly from GNSS chip on Android devices?

I'm trying to directly communicate with the GNSS chip on my device and I am not clear whether the RAW GNSS information is coming directly from the GNSS chip or not. I have used the application ...
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0answers
23 views

Garmin GPSMap 64S deleting waypoints?

So I'll start off by saying I'm still in the rookie stages of GIS work. But I have a GPSMap 64S and for work I had to go out and collect waypoints of an area. No problem, all was good and well, got ...
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1answer
76 views

Can GNSS precision be improved with a local atomic clock?

Does the use of a local atomic clock improve the accuracy for position determination with existing GNSS?
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27 views

How to get the nearest distance by two point

I'm new here to learn QGIS, But I find some problem that I cant solve, I have two gps data and I add them to Qgis, I connect the points by using Point2One, each of them own more than 1000 points, I ...
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1answer
57 views

Incorrect address mapping in Google Maps and Google Earth?

We were issued a 911 address when we built our building approximately 3 years ago. When you go to google maps and google earth and put our address it incorrectly pulls up in town. The correct ...
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33 views

Failing in Current GPS location in Q Field

I made a project in QGIS (desktop) with a point layer and a basemap from Mapsurfer. As I'm working in Portugal, I am using for project and layer CRS EPSG:3763 - ERTS89/Portugal TM06. Then I make the ...
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1answer
48 views

Can Qfield be used with external GNSS service?

I'm currently testing an external GNSS service on my mobile device. It produces RTK corrected GNSS signal that is distributed over bluetooth as NMEA format. Is Qfield able to read an external GNSS ...
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0answers
26 views

GPS track reconstruction using acceleration and heading [closed]

I'm currently working with a huge amount of GPS tracks from vehicles. Looking at the data I noticed something interesting : I have a GPS position + timestamp every 10 seconds (which is not a lot) but ...
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0answers
30 views

Calculating turn rate in GPS track data? [duplicate]

I have GPS track data and for each point have a latitude, longitude, and a timestamp. In most cases, the time between points is just a few seconds but it varies. I've flagged some of the GPS points ...
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1answer
25 views

'Regular Points' vector layer in Bonn

I've downloaded the bonn version of QGIS. Using the 'regular points' vector analysis tool, I've set some 5m regular points over a field so that I can use the x,y coordinates to plot them and measure ...
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1answer
71 views

How are the minimum X, maximum X, minimum Y and maximum Y coordinates calculated for a state's county?

I am working with the eBird API. The eBird website is where birders from around the world enter lists of species for a specific location. The one API endpoint I was trying to work with returns data ...
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1answer
85 views

ECEF to relative displacement in meters

I have GPS NMEA (National Marine Electronics Association) data that I collected being stationary and I can see the displacement of 4 meters just by looking at GPX data uploaded to google maps. I am ...
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2answers
101 views

Auto generating waypoints to a GPX file along track (hiking path - not as crow flies)

I have used Google Maps to build a list of waypoints for a trail I want to hike but the waypoints are simply my start, end and maybe a couple of points of interest for my day and any campgrounds along ...
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1answer
192 views

Get direction on a laptop with Google Maps

I have a laptop (Windows) in a car and I want to use it with Google Maps to get my directions. Unfortunately, it's not always the same person who uses the car, and all the user of the car don't have ...
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1answer
28 views

Creating 2 symbology in the same layer on Mapinfo [closed]

New to MapInfo, I would like to create a High voltage layer with two different attributes (11 and 6.6) representing by two different colours on MapInfo. How can I do that?
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1answer
129 views

Use QGIS or QField with a GPS physically walk a polygon in the field

Is it possible to use QGIS or QField with a GPS to physically walk a polygon in the field? I'd like to use the software to physically walk shapes in the field but have been unable to find information ...
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1answer
150 views

How external GPS can feed HTML5 geolocation API for django-leaflet

My goal is the following: I'm developing a Django project. The goal is to locate places with a form. I'm using a CreateView generic view (maybe I should create it manually for more customization. 3 ...
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0answers
29 views

Determine geograpic coordinates from one fixed location as accurately as possible without expensive hardware

I build a GPS disciplined oscillator and I need to set antenna coordinates in order to be able to operate it as accurately as possible. What I need is a way to determine the geographic coordinates (...