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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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Connecting GNSS receiver and ArcGIS Field Maps

I have a problem with my GNSS receiver and ArcGIS Field Maps by Esri. I´m using Stonex S500 receiver with cube application. In this application receiver working perfect. But if I start Field maps and ...
Jozef Hiľovský's user avatar
1 vote
1 answer
33 views

Bad-Elf With an iPhone: cannot be paired

I am new with using Qfield on my iPhone XR (formerly with Cartomobile). I do try to link the external Bad-Elf GNSS Surveyor in QField using Parameter-Positionning-Add but the Bad-Elf GPS is not ...
Denis's user avatar
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1 vote
1 answer
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What does "Common frequency offset" plot means in gnss raw measurements?

I'm using Google's MATLAB code to analyze raw gnss measurement made with gnsslogger android app. In plots, there is one in particular that I don't understand the meaning, which is "Common ...
allexj's user avatar
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Why if I spoof the position with GNSS Analysis MATLAB Google code,I get a spike of horizontal speed but it continue to be active while should be const

I'm using this GNSS Analysis Matlab Google code to analyze the measurements performed via GNSSLogger app. I was initially in Palermo,Sicily and tried to spoof to Rome. I get this Horizontal speed ...
allexj's user avatar
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Vertical CRS my Google Earth Engine code is outputting when I export to a CSV

I am using Google Earth Engine to annotate my movement tracks with high resolution elevation data. I am currently importing lat/long coordinates which have a horizontal crs=EPSG:4326. I am annotating ...
David's user avatar
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35 views

Importing NMEA RMC sentences into QGIS

I would like to import NMEA RMC datasets into QGIS (I'm using 3.28.3-Firenze). I log these on a separate measurement data logger. So far I have been able to import a .log file with GGA and RMC ...
Daniel's user avatar
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1 answer
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GPS NMEA - is VTG 'Course' the same as RMC 'Course over ground'?

I have been reading up on NMEA messages here and other places, but it isn't obvious to me if the VTG message 1 (Course) is the same as RMC message 8 (Course over ground). They use the same number for ...
theGtknerd's user avatar
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How to assign a household (with its GPS latitude and coordinate) to a certain pixel of the .tif file in R-Studio

I have a one-day composite flooding data downloaded from https://www.ssec.wisc.edu/flood-map-demo/ftp-link/ftp-link-viirsrealtime/ for a specific region (called viirs_max_01_2023.tif). The pixels are ...
AJY's user avatar
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1 answer
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Bad Elf not showing location data in QField

We have a K88 Android tablet running version 7.1.1 (currrent version is 14 something). I can connect the Bad Elf to the app via Bluetooth, but no positioning data appears to be transmitted. I've ...
Alexi Allen's user avatar
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Connection between GPGGA HDOP and GPGST deviations

I would like some clarification regarding HDOP in the GPGGA message (Field 9) and standard deviation of latitude/longitude error in GPGST message (Fields 7 and 8). Are the values presented in the ...
Passerby1212's user avatar
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Defining outbound and return directions of GPS points in QGIS

In QGIS, I have a layer of points corresponding to the positions of my vehicles every 2 seconds. So, my layer contains the following information: XY coordinates Vehicle number GPS heading Timestamp ...
Youssra El Moussaoui's user avatar
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28 views

Getting positional data of LEO satellites

How can we get precise lat, long ( or xyz in ECEF ) location of LEO satellite like FORMOSAT (COSMIC-2 ) - including error matrices? POD data is available here, and tried with ‘Level 1a - Precise orbit ...
abhilash's user avatar
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1 answer
132 views

Finding time data in a .gpx file

This seems like a simple problem but I have searched for answers and apparently reached the limit of my experience. I have a .gpx file and I am trying to see the time data for various points along the ...
AbeFroman's user avatar
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Drawing a polygon from UTM coordinates without using a computer

all. I'm having trouble remembering how I used to do something, and I can't find any answers so far online. Years ago, I would take various points of, say, a field using a handheld GPS. I would then ...
 Liston1664's user avatar
-1 votes
1 answer
50 views

Viewing GPS coordinates on Trimble Geoxh 6000 [closed]

I read that the point coordinate system is proprietary. What software do I need to view the points as gps coordinates and how would I go about doing it?
Garrett Jones's user avatar
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1 answer
62 views

Extracting GPS Coordinates for Grid Square Centers

I'm relatively new to GIS, and I'm currently using QGIS version 3.32.3 Lima. I'm encountering some challenges as I don't have a solid foundation in using GIS, so I'm reaching out for your help and ...
fterranova's user avatar
1 vote
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60 views

What is the expected Doppler shift of the GPS C/A L1 PRN code duration? [closed]

For the past few months, I have been writing an SDR-based GPS receiver (L1, LNAV, C/A). Things are going well, and I've managed to calculate a position fix in deep space. After lots of thinking and ...
Phillip's user avatar
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GEE - extract temperature data for a large dataset of GPS locations

I'm trying to extract mean temperature data for specific GPS locations across a large latitudinal/longitudinal range). I am using Google Earth Engine (new at this). To get to the code I'm showing ...
mto23's user avatar
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What is a tenth of a second (WGS 84) in feet? [duplicate]

What is the equivalent of a tenth of a second (WGS 84) in feet? This would be located in northern NM in the US.
Sherry G's user avatar
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Calculating from GPS time duration of a linestringM within a polygon

I am analyzing trajectories from GPS points, including timestamp (Linestring M). I need to clip trajectories that cross polygons, and calculate time spent within those polygons. However, I have 2 ...
Remi79's user avatar
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1 answer
230 views

Finding nearest OSM link (road) to GPS points in Python

I have a large dataset (about 50,000,000 rows) of GPS x,y points related to GPS equipped taxis with timestamps and speeds. I also have a shp. of the OSM links and I want to find the nearest link to ...
Themos Papadopoulos's user avatar
0 votes
1 answer
55 views

Can differences in Datum make a big difference in RTK surveying?

I'm a student studying surveying and analysis. I have gathered coordinates data on the same point via VRS, RTK, and Thingstream's PPP. It seems like VRS and RTK goes similar, but PPP keeps getting ...
Lee wonjea's user avatar
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1 answer
38 views

Do smartphone GPS error vectors cluster around some fixed vector if I use the same satellites over 10 minutes?

Rather than accurate latitude/longitude/elevation data, I need accurate change-in-latitude/longitude/altitude data. If I use the same satellites over a 10 minute time period, then I expect that two ...
popham's user avatar
  • 101
2 votes
1 answer
79 views

Get Lat,Lon,Elevation, and IMU data for DSLR camera

I am looking for a way to take images from an airplane window, and record lat/lon/elevation and camera roll,pitch,yaw to image exif data. The purpose for this is to project detected objects in an ...
Franklyn Dunbar's user avatar
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0 answers
18 views

Buffer: shape_Area=0

I used the GPX to feature tool to add data points to my map. I draw buffers with a different radius around each point >10 m (some of them overlap). However, the column shape_Area is 0 for all the ...
Daniela's user avatar
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0 answers
36 views

Some iterative way to compute heading and GPS projection at the same time?

I have the following situation: An off-road machine has a GPS antenna that is not at the center of the rear axle (this point is my path-tracking-control point). Let's say it's 3 meters from the rear ...
Jonny Quest's user avatar
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0 answers
18 views

Constructing VTEC values out of UNAVCO data

I'm going through the high-frequency UNAVCO RINEX 2.11 files to create atmospheric maps of the total electron content at a particular timestamp over a particular lat/lon range. I'm looking for ...
requiemman's user avatar
1 vote
0 answers
41 views

Connecting to GPS

I am running QGIS on a Panasonic CF-20 toughbook. When I run GPS viewer I get satelite connection and it connects via COM 6 at a baud rate of 9600. Within QGIS when in the GPS panel I select serial ...
Mark Baknes's user avatar
6 votes
2 answers
126 views

Is there a common method for measuring "curviness" of a line?

I have a bunch of GPS tracks in a Postgres+PostGIS database and want to extract a single metric as a measure of turns shown in the data. Some of the GPS targets travel in almost straight lines while ...
RedM's user avatar
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1 answer
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GPS error introduced by tall cliff

I need to capture the coordinates of several points along the bottom of a tall vertical cliff. Standing at the bottom of the cliff only the half of the sky facing away from the cliff is visible. Is ...
OMRY VOLK's user avatar
  • 141
0 votes
1 answer
191 views

How to calculate GPS offset given azimuth(bearing) angle and slope distance and inclination angle of the object

If there is an object (tree) which gives back the below data measured from a given GPS location: Azimuth angle Slope distance to the tree or object Inclination angle to the tree or object. How to ...
amed svensson's user avatar
1 vote
2 answers
112 views

Performance of RTK when observed satellites don’t correspond

When a rover receives observations from a base station (e.g. through NTRIP from a CORS network) it can perform RTK to reduce ambiguities in matching observations to get a more accurate fix. What ...
ljden's user avatar
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1 vote
1 answer
223 views

When do permanent RTK base stations need to update their advertised ECEF coordinates to account for continental drift?

I have recently setup an L1/L2 RTK base station in the UK, with the data served via rtklib, NTRIP and rtk2go.com. With a matching rover I am getting reliable 10mm fixes with excellent repeatability ...
colintd's user avatar
  • 191
0 votes
1 answer
170 views

GPS capable rangefinder or camera to capture GPS data

I have looked at this link GPS capable rangefinders or cameras that can capture lat / long data from a distance? I have looked into the LaserTech product information but it seems to me I can't find a ...
amed svensson's user avatar
2 votes
0 answers
386 views

How to convert a .CSV file to a RINEX file for post-processing?

I will preface this by saying i'm not 100% sure this is the right stack exchange to ask this on and i'm completely out of my depths here with the work i'm trying to do but alas i will proceed. Field ...
Mow's user avatar
  • 175
-2 votes
1 answer
158 views

Get altitude over WGS84 ellipsoid from GPS tracking app [closed]

I have been using multiple GPS tracking apps for sailing in my iPhone, such as iSailor, whose output is a KML file that looks like ... <when>2023-08-16T09:12:51Z&...
Lothar's user avatar
  • 1
1 vote
0 answers
40 views

Saving layers with diferent types to a single GPX file

I have the following twos methods to save a vector layer in the project folder The first one is generic and the second calls the first to save specifically a GPX file In order to export one group of ...
Marcelo Franco Patané Júnior's user avatar
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0 answers
49 views

QField not saving location data

I'm a total newbie at this, volunteering in a survey project. We're using QGIS and QField with SinoGNSS hardware and Survey Master running in the background. For some reason, when saving a location in ...
Edwin Humphries's user avatar
1 vote
0 answers
148 views

Transform TEME TLE derived positions of a GPS satellite to the WGS84 coordinate system for comparison

I am trying to compare TLE derived x,y,z positions of a GPS satellite with those derived from precise GPS ephemerides (NGA). However, I am having some trouble getting the coordinate systems and ...
woplda123's user avatar
0 votes
0 answers
45 views

Extracting polygon from embedded Google Maps panel

I'm trying to extract a polygon from an embedded Google Maps panel on this website (lower half of site), representing an area of coverage. I can not seem to find any file on the website that ...
C͝͡e̷͢pt̡̕i̴̸͘u͜͠͝m's user avatar
0 votes
0 answers
23 views

Create network from GPS coordinates QGIS

I'm trying to map all the recent flights that a friend has taken. I have GPS coordinates in excel that I've converted into a .CSV file and imported into QGIS. I now have one layer of origin airport ...
nicogis's user avatar
3 votes
1 answer
85 views

Explanation for the GPS “special message” field

In the GPS specification (p124) there is a facility for the satellite to send a “special message”. The content is “at the discretion of Operating Command” but is anyone aware of any statement of how ...
Steven Murdoch's user avatar
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0 answers
96 views

Streaming GPS data to QGIS from DELL internal NEO-M8 u-blox

Dell 5434 with built in NEO-M8 u-blox. Appears to be working as checked with u-centre 22.07. In Device manager: Sensors shows u-blox GNSS location sensor. Ports (COM & LPT) u-blox Virtural Port (...
Stegosaurus's user avatar
0 votes
1 answer
217 views

Does multi-frequency GPS help during cloudy/overcast skies?

One of the problems with GPS is difficulty locking on to a signal when the device is under dense canopy or when the skies are overcast. Do multi-frequency (not multi-GNSS) GPS systems help with this? ...
ahron's user avatar
  • 103
0 votes
2 answers
152 views

Location doesn't display on QField (Windows 10 tablet using Trimble R2)

I'm using a R2 Trimble antenna with a Windows 10 field-tablet to collect data on QField. However, I don't seem to be able to get the localisation working. It worked one day, and since then nothing. ...
Phyllerock's user avatar
-1 votes
1 answer
48 views

On-line mapcode to GPS (or street address) converter

My car GPS navigation unit has a stored location and gives it as a mapcode (2 groups of 4 characters separated with a dot). I've searched but can't find any on-line converter that can take this ...
Peggy Schafer's user avatar
0 votes
0 answers
15 views

Sampling weather raster by date in GPS dataframe in GEE

I am trying to extract the u and v component of the daily ERA-5 wind reanalysis to datapoints from a GPS dataset of mule deer. I am wanting to only extract the wind to points based on the date of the ...
Luke Wilde's user avatar
0 votes
0 answers
111 views

Gallileo HAS - Android support

Galileo started to provide corrections (HAS) at the beginning of the year. They are distributed either directly on the E6-B frequency or over the Internet via the Ntrip protocol. According to EUSPA, ...
DNL852's user avatar
  • 9
0 votes
1 answer
74 views

How to extract the GPS data of the markers that I added in my shapefile in QGIS?

I was wondering, is it possible to extract the GPS coordinates of the red markers that I added in a shapefile in QGIS?
Asd0311's user avatar
1 vote
1 answer
3k views

Android GPS accuracy (2 m) is greater than nominal accuracy

I read in several posts and websites that public GPS signal to smartphones has an accuracy of around 5 m, and that civilian signal accuracy is 100 m. Some other posts mentioned accuracy of c. 2 m and ...
rodrikev's user avatar
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