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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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Calculating LSD converion to GPS Coordinates

I am working on an app for my Fire Department to help us convert from Canadian Legal Subdivision (LSD) system to GPS coordinates. We will use these coordinates to show a point on a Google Maps ...
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28 views

No GPS position in QField

In qfield, I cannot get gps information to work. If I press the gps button, the map freezes and cannot be moved any longer. The gps status bar does not show any positioning value (X: N.a. ...). ...
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16 views

Seeking open source Android app for capturing pics and upload it later when Internet connection available? [closed]

In a Road survey, we need to collect information related to culverts and bridges, we are doing it by using GPS Juno SA/SB, and collecting data in SD Cards. Now the challenge is that client requested ...
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28 views

GPS accuracy for utility mapping? [closed]

Can anyone suggest a good accuracy and affordable GPS Handheld for utility mapping?
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0answers
20 views

Filter pictures in directory

I have a drone project with 50,000 pictures in 50 layers. Each layer has 2 to 5 zones. When I put them all together, we have a lot of overlap and in some places, we have up to 4 pictures of the same ...
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15 views

calculating HRMS using NMEA sentences including GPGGA , GPGSV, GLGSV, QZGSV,QZGSA, GPGSA?

I have NMEA sentences including GPGGA , GPGSV, GLGSV, QZGSV,QZGSA, GPGSA and GNGSA. my goal is to achieve HRMS accuracy meter. produced android devices for special intent gives GP/GN GST nmea message ...
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7 views

is it correct calculation to achive HRMS and VRMS values from GST nmea message?

I need to calculate VRMS and HRMS values correctly using NMEA GST message. an answered question says a calculating formula. Calculating VRMS and HRMS from NMEA data? $GPGST,172814.0,0.006,0.023,0....
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22 views

Is GPS differently discretized

Using this GPS module and keeping it still just outside the window, I get different "resolution" for latitude and longitude. In particular, plotting its data on MATLAB I obtain the following plot ...
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26 views

RTKGPS+ : Could we use the mobile device as a rover?

Using an Android (version 9) based smartphone, I installed RTKGPS+ ( https://github.com/eltorio/RtkGps ) from the play store. I wonder if it's possible to use the internal GPS chip of the smartphone ...
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26 views

Showing realtime HEADING in ArcMap using GPS positioning toolbar?

How can I display a real-time GPS position in ArcMap 10.1 using the GPS toolbar? We have it setup so position works fine. Just ArcMap refuses to interpret HEADING. So the real-time icon cannot ...
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6 views

Trimble Positions

I have been working with Trimble positions for a few weeks now and I am trying to get the hang of it. My question is I will make a test project within the Desktop Administration window and when I am ...
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1answer
76 views

How to find lat/long of point knowing cross track distance

Knowing lat/long of point A , B and C. And knowing cross track distance (CTX) from point B to point D. How to find lat/long of point D?
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1answer
23 views

Extract GPS track from TomTom Bandit videos

I would like to extract GPS tracks with a commandline-tool from videos recorded with a TomTom Bandit action cam . There is the proprietary software of TomTom to extract the tracks but I need something ...
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1answer
39 views

How to calculate past coordinate pairs from current coordinate pairs, a heading, and speed?

I am very new to this side of the world. I am a classical embedded software developer. We want to incorporate GPS in our project. If I have the current Latitude, Longitude, Height,Heading (I hope this ...
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41 views

Timestamp mismatch in the data recorded by Vlp16 with Ublox-M8T

Currently, I am working on Velodyne vlp16, for which I recently added UbloxEVK-M8T support. The setup is working fine but when I record the data from VeloView, the GPS timestamp is showing incorrect ...
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1answer
50 views

How to get GPS location in OSMDroid without Internet connection?

I made a little app in Android using OSMDroid library, my map is loading from assets. Now I want to put my GPS location on that map, but without using Internet connection. I found these ...
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13 views

Converting GPS RMC speed?

I'm working with a GPS chip. When I receive the RMC data and I print the velocity I get values like this: 156 1336 83 298 ... I google it and I found this from here Speed over the ground in knots ...
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1answer
40 views

Converting Point Feature to Latitude/Longitude Coordinate and GPX?

I drew a point feature using the draw tool in ArcMap on a map in an area of interest. I am now interested in extracting the actual latitude/longitude of this point in geographic space so I can ...
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12 views

On average, for how long are DGPS corrections good for?

I have a energy contraint system and I am looking to minimize my energy usage. If I have a DGPS system that can calculate its error, typically, how long are those corrections good for ? seconds ? ...
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1answer
48 views

Differential GPS without RTCM

If a base station can keep a list of known rovers in the area and the rovers transmit their GPS information (coordinates) to the base station, can the base station correct their position ? For ...
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1answer
24 views

Accurately tracking location in outback? [closed]

I am looking for a way to efficiently track my whereabouts/tracks whilst traveling through the Australian bushland. In the past, I've just recorded my longitudes and latitudes from a basic GPS onto a ...
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2answers
63 views

QGIS: How to store the GPS coordinates in the attribute table? [duplicate]

I got vector points on a map. I already have the elevation information in the table for each vector point and the point-id. Now I want to get the GPS coordinates for each point stored in this ...
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1answer
96 views

Reasoning behind GPS time week number?

So the GPS Week Number rollover has been all over the news lately. I don't really know anything about GPS, but my first thought upon reading up on this topic was: why use a week-based format in the ...
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9 views

Ensuring a public Ntrip caster tracks the same satellites as you

dGPS requires two receivers to track the same satellites simultaneously. When one of the receivers is a Ntrip caster, what is the canonical approach to ensure your receiver tracks the same satellites/...
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1answer
38 views

Reading RINEX formatted streams

I'm playing around with a public NTRIP caster but I'm very new to all this. I'm using BKG Ntrip Client to read the stream and the file I get has around 45 lines for each sample. Each line begins with ...
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25 views

Difficulty in getting QGIS to connect with in-built GPS (COM3 NMEA port)

I have a Motion J3500 rugged tablet which was upgraded last year to run Windows 10. The tablet has a built-in GPS / broadband module (Gobi Sierra 2000). I use QGIS (v3.2) on the tablet, with the GPS ...
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29 views

Getting authentic and verified current location of user?

I am building an application that needs a user to send his current location. However, since GPS signals can be faked. I need the user current location to be authentic and verified. I thought of ...
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2answers
42 views

What GPS geographic coordinate system is this?

I received a couple of gps data on animal movements from a research paper but was unable to recognize the format and map it. Any idea what format these GPS coordinates are? The GPS locations should ...
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0answers
59 views

Spatial-analyst, detecting bad ones from good positions GPS coordinates with QGIS?

I'm curious if someone else has been thru this problem and how it was solved. Many years back people marked the position manually on a map to get waypoints of for example electric wire connection ...
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0answers
25 views

Easiest way to translate live GPS to realtime GTFS? [closed]

I have live GPS data coming in from the city's buses and given that I already have the routes in GTFS ( https://developers.google.com/transit/gtfs/reference/ ) I would like to convert this data to the ...
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1answer
193 views

How to fix 'GeoSeries' object has no attribute '_geom'

I'm working on a python script whose goal is to detect if a point is out of a row of points (gps statement from an agricultural machine). To do this, my idea is to make a buffer around the 10 points ...
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1answer
37 views

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

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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1answer
37 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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1answer
27 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
42 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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1answer
156 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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28 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
40 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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1answer
223 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
52 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
48 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
41 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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24 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
94 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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20 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
91 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
70 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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2answers
403 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
47 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
220 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 ...