Questions tagged [gps]

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

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55 views

Computing GPS points accuracy

I have stand alone GPS points and RTK points collected at the same time and I want to compute the accuracy (1 sigma) of the GPS points. Using the haversine formula, I computed the distance between the ...
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Distance calibration between GNSS RTK receiver and display/processing device?

Are there any known procedures for calibrating a precise position of an external processing/display device (e.g. a smartphone or a tablet) relative to the GNSS receiver? Apparently, such a procedure ...
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199 views

Intentionally offset GPS coordinates using heading [closed]

Is there a known way of intentionally offsetting a latitude/longitude position by using a combination of the latitude/longitude and heading? I'm struggling to find any kind of answer or solution for ...
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1answer
51 views

Difference between a GNSS receiver and GNSS antenna

I´m relative new using GNSS data and I would like to understand a little more about the instruments that I´m planning to use in my future research. I was looking information on the UNAVCO website ...
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45 views

Eliminate irrelevant points based on time and distance

I'm collecting raw GPS points from android device for tracking, now when i'm creating a linestring based on the points i collected there are some points which makes no sense (due to GPS fluctuations). ...
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47 views

Manually Change File Creation Date of SSF File

Editing date in *.ssf files? says that with the utility of GPS Pathfinder Office software called "Check SSF files" you can change the date of creation of such files, checking the option "manually ...
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Determining when next Ephemeris update is scheduled?

I am retrieving precise ephemeris data from an open online service. They claim to be updating the ephemeris of the satellites every 3 hours as the parameters are broadcasted from the satellites. How ...
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1answer
94 views

What is Time of Validity in a GPS System?

What is time of validity in a GPS system? For defining time of validity, there are only a limited definitions available. My interpretation for time of validity is the built-in system time (like on ...
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63 views

QGIS, polygons and GPS

I intend to use QGIS 3.6 as a tool for archaeological field works, live tracking. I have created a form and everything works great except for creating polygons. I have installed QGIS on a Panasonic ...
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66 views

How can I find a postal_code for a given Lat/Lon in a OSM database?

I have a OSM database on postgres/postGIS. Data are downloaded from https://download.geofabrik.de/ and created in postgres with osm2pgsql using schema osm2pgsql. Now I'm looking for a postalcode on a ...
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185 views

Calculate Galileo satellite position from Ephemeris data

I'm trying to calculate Galileo stallite's position from ephemerides data. I'm reading from https://gssc.esa.int/navipedia/GNSS_Book/ESA_GNSS-Book_TM-23_Vol_I.pdf at 3.3.1. The first step is: ...
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31 views

Show imported waypoints in table of contents (QGIS)

I collect data with a garmin handheld GPS, and then import said data into GIS software. For a specific project, I need to manipulate the buffers for individual points that Ive collected. Is there a ...
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45 views

Conversion vector geometries to garmin img/mapsource

I’ve had a Garmin gps (Oregon 700). I want to create custom map for my device. I prepared a vectors (shapefiles saved in personal ESRI database) in ESRI ArcMap. I want to convert this set to Garmin ...
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Filtering points in cloud to find representative set

I have multiple sets of points that represent 'instances' of GPS traces. When ordered and connected, I have a line that represents each trace. I'm trying to find the most average line through this ...
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Are there any technical limitations as to why GPS can't have a centimetre resolution? [duplicate]

GPS is not very accurate. I was wondering if this is a technical or economic feasibility problem. If there are no technical barriers, GPS devices with accuracy within 1 centimetre might be possible by ...
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Grouping gps-points by location and time using QGIS?

I tracked my holiday-routes with some friends for many years. We tracked 3 cars each year, every car with another GPS-Tracker. The GPS-Tracker locate the position every 10 minutes. I'm using QGIS 3.2 ...
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136 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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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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106 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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34 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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185 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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50 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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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
117 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
34 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
44 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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118 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
279 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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31 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
75 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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16 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
78 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
31 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
133 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
118 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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10 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
48 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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116 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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48 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
46 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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67 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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71 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
2k 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
65 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
100 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
170 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
108 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
395 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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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
43 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 ...