Questions tagged [gps]

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

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12 views

How to calculate RMS for coordinates [closed]

I'm using ZED F9P RTK GNSS module for PPP. I'm using Rtk2go and RTKNAVI for getting the measurement. How can I calculate for RMS?
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Coordinate system and Euler angles [closed]

Let's say I have a black box and I know its coordinates from GPS and I can measure as well roll, pitch, yaw and accelerations. Let's say I want to move from point a to point B (I know the coordinate ...
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GPS coordinates capturing with Qfield

I am designing a QGIS project for collecting data in the field using Qfield or INPUT as mobile app. So the question is how to know if the surveyor is standing within the parcel when collecting data. I ...
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44 views

How to calculate elevation angle between two GPS coordinates?

I have two gps coordinate points (longtitude,latitude, altitude). Within range of 1 or 2 km. I would like to know if it is possible to calculate the elevation angle between these 2 points. simple tan ...
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18 views

QGIS 3.14.15: is there a build in option for storing additonal quality data from trackpoints captured with DGPS antenna

I'd like to use QGIS for collecting datapoints in field. Due to the 'GPS information module' it is no big deal to connect the R2-Antenna via Blutooth-link and read the NMEA stream. As far as I figured ...
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37 views

Finding regularly intervalled GPS positions between two known GPS points

I have been trawling for a solution for a while now, and either I cant find the correct solution or I'm not quite getting my search right. I have some GPS points from a ship track that are collected ...
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34 views

How to calculate mean of GPS data assigned to 30 m segment in QGIS?

I have collected some temperature data from a Google Car dataset with each data having Lat/Lon and temperature values. The data is stored in CSV file. I already fixed the GPS lat/lon by using "...
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Lat Lng Search Along Line from Direction (Geographic North)

Most of the lat lng searches are for POIs within a radius. How does one define POIs+(margin of error) that are along a (infinite) straight line (or geodesic or great sphere) defined by a north ...
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Create a video from a track (GPX / KML) using Google Street View images

I am trying to create a video from a track in GPX or KML format from Google Street view images. If I enter the data of the coordinates of a location, I can generate a JPG with that image. My problem ...
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Smoothing all the intersection for GPX track points?

I have a.GPX Track file that has too many intersections. I want to smooth out due to all the intersection Currently, I'm trying to figure out a way to smooth out this track file. The intersections are ...
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Georeference single drone image from EXIF data

Looking for an algorithm (python, formulas, whatever...) to georeference a single drone image based on its EXIF data. Specifically, I need to translate drone GPS latitude and longitude (after ...
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354 views

Distance between GPS travel route and country border

I have no idea how to, or even is possible in some way, but maybe there is an app, software or someone of you have any idea how to! Please note, that I have no skills in coding or programming. I will ...
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GPS tracking gives me wrong path

I am having trouble collecting GPS coordinates. In my case, I need to walk from point A to point B and collect the coordinates avoiding any obstacles. I used an android phone and mapmyrun app. When I ...
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Calculating GPS coordinates given distance between points

I have 2 points where I know the GPS coordinates of one of the points. Additionally, I know their coordinates in some reference frame where I can calculate the distance between them in real world ...
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1answer
37 views

Getting table of coordinates from polygon in QGIS

I would like to gather all of the GPS coordinates within a set area as a table to transfer it to Excel or sheets. I designed a rough shape of the area with the polygon tool in the layer and now im ...
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43 views

Calculating GPS uncertainty as a function of general position and time

Is it possible to calculate the uncertainty in a GPS measurement at a given point at a given time by taking into account the number and positioning of the GPS satellites overhead? People throw around ...
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1answer
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GPS with external antenna. Which piece of hardware is the limiting factor for accuracy?

We have a Trimble Geo 7x (cm edition) which can operate with it's own internal antenna. It's spec sheet states that it can theoretically achieve 1.5 cm + 2 ppm VRMS vertical accuracy. We also have a ...
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1answer
58 views

ArcMap field mapping with Garmin GPS, Connectivity Issue

We are planning to go on the field for field mapping. We have Garmin GPS devices and planned to make a connection with the ArcMap GPS toolbar. Unfortunately, ArcMap can only communicate with the GPS ...
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Preview-problem when editing small polygon-features in QField

I have the following problem. When surveying small objects on QField, such as structures with a diameter of 20 to 100 cm (with external GNSS-receiver, +- 1 to 3 cm accuracy), a problem with the ...
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2answers
23 views

Differential correction for certain days in the past

I would like to know if there is any way to perform differential corrections on data that were collected about 1-3 months before. I know that NOAA has data here, but can I perform differential ...
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2answers
50 views

Heading rate/bearing from GPS points in BigQuery

I want to calculate heading rate / bearing from GPS points in Big Query. I've check all of the geography functions in BQ but found nothing helpful. Has anyone done it in BQ? My data consist of ...
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1answer
26 views

Distance between current and previous GPS Point BigQuery

I have a table with 150.000 rows containing DateTime, GpsLongitude and GpsLatitude columns. Timestamp difference between rows is 10 seconds. I want to calculate the distance between every current and ...
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128 views

Self-made RTK correction with RTCM data

I would like to explain my situation. I have a GNSS receiver, which outputs me NMEA data (read below). I receive RTCM data via NTRIP from a caster. I would like to correct my GPS position with ...
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1answer
43 views

Resolution in timestamp

I'm using a device with a chipset "ublox NEO-M8U" and an external antenna. I tried to write a parser for NMEA data that I received from this device, but I cannot find an answer to the ...
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38 views

How many GPS-Satellites are needed for time synchronization without positioning

Is it possible to do time synchronization without positioning with only 1 GPS satellite? If not, how many satellites do i need for time synchronization without positioning?
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Nav message files clarification

I'd like to know what the difference is between .XXn RINEX files as published by navigation stations such as the Brussels one, bruxXXXX.XXn, and the broadcast .XXn files. I'm asking this because when ...
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Area measurement validation: ellipsoid vs geoid

I try to validate area measurements on orthomosaics using objects of known size on the ground. I'm working on centimeter level measurements. As far as i understand an orthomosaic in WGS 84 is ...
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Angle between the magnetic field vector and the vector joining a satellite to a receiver station

I was wondering if someone could help me in finding the angle between the magnetic field vector at a location and the vector joining a satellite to a receiver station. This angle is also known as ...
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How does Pix4D align overlaping images based on one GPS point

Images that can be imported into pix3d have only one GPS position labeled in center of the picuture. I am wondering how does this tool make mosaic (create one big picture with stiching together many ...
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QGIS: Life GPS and auto rotate canvas with two antennas and receivers?

I am using QGIS and life RTK-GNSS on agricultural machines to find the borders of my fields. In some situations I would have benefits if I could see the position of an antenna in front of my machine ...
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1answer
121 views

Direction of taken photo (QFIELD)

Just wanted to know if it is possible to define the direction of taken photo? I took a lot of pictures with QFIELD (at my Phon) and I would like to know which direction has each Photo when I was ...
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52 views

How to calculate object real life location from self driving car?

I have a video made from a car together with GPS information (location coordinates, altitude, speed, track to true North degrees and other. Also I have a 3gf file of g-sensor but I’m not able to parse ...
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Seeking maps to use on iPhone/Android app

How can I get data of the earth map on the iOS sdk "Swift" containing data altitude too? I would like to use all world map, gps position (but I think that's not a matter) and altitude of all ...
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Calculating point GPS location in picture

I have camera location (GPS coordinates) and need to calculate some points (pixels, actually it’s some detected objects points) location (GPS coordinates) that are seen from the camera. I found in the ...
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Soil Analysis with GEE. How do I look up GPS coordinates? [closed]

I am trying to examine the soil order of several of my sampling sites. I have the GPS coordinates for each of these sites but I lack familiarity with GEE. I am looking at "OpenLandMap/SOL/...
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Getting displacement in meters from “XYZ ECEF” or “NMEA” data

I am new to this field. I am working on a GNSS receiver that gives me live location data in NMEA and XYZ ECEF format. The receiver is mounted on my rover and I wish to use this data to get the rover's ...
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Is the acronym GPS used by members of the public in countries like Russia or China, who have their own GNSS

In the UK, and countries using the GNSS controlled by America, the acronym GPS (Global Positioning System) is used to describe the data. I was wondering if members of the public in countries like ...
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How to make a match the GPS location to a model?

So I have a map like this where I need to match the GPS position of a device to a specific position in a model: This is roughly the model of the place where I want to use the GPS, is there some way I ...
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127 views

How do I specify the CRS in light of the rgdal update?

My data (df) are in Africa Albers equal area projection: x_ y_ t_ id 704109. -3029239. 2015-05-12 09:28:00 A 703680. -3029412. 2015-05-12 10:00:00 A 703043. -3030028. ...
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Does GPS measure faster speed better or lower speed better? [closed]

Assuming the same signal condition (HDOP, SNR, or other environmental factors), does GPS measure faster speed better? or lower speed better? Note that the speed measurement here is derived from ...
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85 views

Math formula to calculate GPS location for weighted GPS data points

I'm working to improve the location and accuracy of a map / data-point driven application. I have a collection of locations of interest. Each location of interest has a collection of data points that ...
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101 views

Do I need IMU data for image stitching and orthomosaic generation?

Background: I am working on low-cost raspberry pi based camera system to integrate it on drones as an external module. So, I am using Pi camera and UBLOX Low cost GPS receiver which logs data in CSV ...
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Automatically add date/time and sequential number to new GPS points in the field

We are using a tablet running QGIS 3.4.9, connected to a bluetooth GPS device, to record data in the field. We create GPS points using the "Add Point" button in the GPS panel. After tapping ...
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How do I read the GPS data from a GPS device using Java

I want to read data from a GPS device connected to my laptop and find the latitude and longitude. I searched a lot about it but could only find Android related programs. How do I read the GPS data ...
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1answer
38 views

Imported polygon from Google Earth is not being merged

I'm new to QGIS. I need to merge two polygon that I have imported from Google Earth (.kml) but when I try to do so I am getting an error message Not enough features selected: The merge tool requires ...
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3answers
62 views

File format for specifying GPS motion as a function of time?

What file format can specify GPS lat/lon/elev time history? If I want to specify vehicle or pedestrian motion along a waypoint path, what is a compact way of specifying this? .kml has waypoints but no ...
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Techniques for point-level speed calculation from GPS traces

I am working with a GPS dataset where GPS speed is not available, only the lat/lon coordinates and timestamp. Currently, I calculate point-level speed from rate of distance between two consecutive ...
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187 views

NMEA Data Feed into QGIS

We have a maritime simulator in our office we occasionally use for engineering studies...I was trying to figure out how to get a shape file of the path taken by the ship being driven into QGIS. Data ...
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171 views

GPS glitch causes 200 m circles around stationary position- Has anyone seen this before?

I am working with GPS data from public transport buses in a city in the UK. The data have very characteristic circles of approx. 200 m diameter at bus stops. I suspect that these are caused by an ...
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1answer
83 views

Storing elevation for hiking paths as polylines

I need to store the z value for hiking paths. I have the GPS coordinates (points) and the tracks (polylines). I know I can store elevation data easily with the points but are there any ways of storing ...

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