Questions tagged [gps]

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

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1answer
52 views

Cleaning linestrings created from points in PostGIS/QGIS

Can someone please explain the steps to take in order to eliminate the parts of these linestrings which jump across large distances (not along with the road network)? They were created from GPS ...
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8 views

Map GPS coordinate to nearest street [duplicate]

I have an application where I receive GPS coordinates of different vehicles. Those coordinates are displayed within JXMapViewer on an OpenStreetMap. However, some devices have a bad accuracy and so ...
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25 views

Converting local vehicle position coordinates to global vehicle position coordinates [closed]

I'm tracking the position of a vehicle along a certain trajectory using the Kalman filter and the idea is to check for improvements in position estimation through fusion of data from multiple sensors (...
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25 views

Options for precise relative position calculations

I'm investigating an industrial application that has a requirement to calculate with precision the relative distance on the ground between two outdoor points in the following scenario: The first ...
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14 views

Forgot to do calibration on Trimble GPS

I collected the location measurements using Trimble GPS but forgot to do a calibration since I have done that a month or so ago at the same location and I thought that I don't have to redo again. I ...
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14 views

Reading NMEA frames on i2c device?

I have a linux machine which is connected by I2C to a F9P Ublock GNSS device. I need to get the GGA frames and some custom Ublocks frames from I2C, do some calculations and forward them to UDP. Is ...
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1answer
42 views

GPS Hardware for QGIS

I have the same question as this one posted 3 years ago. I use windows 10 and USB 3.0. I have seen a lot of angry reviews about well known GPS device brands so I was wondering if anyone has been ...
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23 views

Do extra zeros change the coordinates for decimal degrees?

At my work we require contractors to submit work reports in decimal degrees with 6 decimal places, i.e. the location of where they paved roads or put in a road sign. The question is, contractors have ...
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13 views

Create ltraj in adehabitatLT Error

I'm trying to use adehabitatLT analyze animal movements. However, I'm having issues with creating a ltraj object in R. I have followed the as.ltraj() example in the documentation and I'm getting this ...
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21 views

Calculating Center (GPS Point) and Radius (km) of n GPS points

I'm new to GPS and position mapping but i have a background in programing and some of the math related to it. I've been tasked with writing a small golang program that takes n GPS points (DMS) and ...
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22 views

Display all trajectories location along with dummy location

I'm trying to display the all trajectory location on Google map along with dummy location. I have tried to display dummy locations with sample location and it works fine, but when I try to connect to ...
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25 views

Fusing position data obtained from one coordinate system with other sensor position coordinates? [closed]

I'm using data from GPS and from vehicle sensors (Ultrasonic) separately to track the position of a vehicle using Kalman filter. I want to implement sensor fusion for the received measurement data and ...
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31 views

Converting latitude/longitude into a slab number (or item number) and vice versa?

Purpose: To compress the data transmission for the longitude and the latitude. Initially these datas are in the form DD.MM.mmmm: degrees, minutes, ten thousandths of a minute. Latitude stands under 28 ...
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8 views

Random and systematic error of GPS or barometer based altitude measurements

All measurements have error, but not all errors are the same. Measurement errors may be: Totally random (noise), in which case averaging measurements reduces error. Totally systematic (bias); if the ...
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1answer
45 views

Is the GPS signal being scrambled near military bases

We are navigating our survey aircraft using standard GPS receiver. Sometimes we fly near the vicinity of US Ramstein military base in Germany and it seems we are losing lock (no solution) in that area ...
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0answers
65 views

What is causing this shift in coordinates?

I'm working on taking raw GPS measurements and getting a position from them. It involves double differencing measurements from a fixed base station (with a known position) and a rover (in my case, an ...
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15 views

Loading a georeferenced GIF with an OziExplorer Map Data File into a Garmin GNSS receiver?

I have a map as a Graphics Interchange Format (GIF) file and an associated American Standard Code for Information Interchange (ASCII) file which has a .map extension. The content of the ASCII file ...
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1answer
69 views

Correction of GPS-Track, snap to road (line, network)

Problem as shown in the image: I like to correct the GPS track (orange) to the right road (black). In a network of roads it is difficult to snap to the right path - for human it's obvious which one ...
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2answers
36 views

Android app to get altitude of places to use in field visit?

I want to verify the height of the ground which is provided to me with the help of an app if available. Of course, I am aware an app will not give me exact value but for me, it works if it shows ...
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21 views

Converting geocentric coordinates to geodetic coordinates?

I would like to start by saying that I am very new to this. I have 160 different points which all have similar layout as below: at point | X= 153346.357 | Y=354912.111 | Z=0 | Doing some research I ...
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1answer
32 views

Turn string data (of GPS coordinates) into a GPS tracker = frozen map. QGIS2.14/Py2.7/Win7/LAN

I am currently involved in a student project which is to turn string GPS coordinates into a GPS tracker. This is my current work: First, the UDP data is shared through a LAN (No internet available) ...
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1answer
28 views

GPS accuracy deviation the same in an area?

I am using a GPS receiver to perform a speedtest over a few meters. I’ve read that the GPS is accurate up to 4 meters. Is the deviation the same in an open area and also over a short period of time? ...
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26 views

Return corner coordinates of images after OpenDroneMap processing

I have images (with EXIF metadata) made by a drone relative to a particular place; having processed them with OpenDroneMap at this point I have an orthophoto with all the geolocated pixels. At this ...
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1answer
84 views

Getting coordinates of pixel from georeferenced drone photo?

I have a problem with geo-referenced photos from a DJI drone. I have the coordinates of the center of the photo and the metadata related to the photo and I would like to know how to go from a pixel to ...
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32 views

How to make analyzeGPS distanceGPS group by trip?

I have a dataset with id, lat, lon and time, where each trip has a unique id. When I try to use mutate with the distanceGPS function in the AnalyzeGPS package and group by trip using this code: gps%&...
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19 views

Updating local datum to latest ITRF?

I have read that Australia is updating its local reference frame. If a small territory has a complete CORS GNSS network aligned to ITRF2000, does it need to update the CORS network to the latest ...
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1answer
60 views

Formula for converting raw coordinates into lat/lon?

I am trying to create an app which consumes data from http://apigobiernoabiertortod.valencia.es/apirtod/datos/intensidad_tramos.json. The JSON files offer the coordinates for me. However, I cannot ...
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1answer
29 views

Parse Error on PostgreSQL when using ST_AsText

I am new to using POSTGIS and PostgreSQL. I am trying to convert PostGIS coordinates into lat and long values. When I copy one of the values and query like SELECT ST_AsText('...
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14 views

Do you need to filter a final GPS [NOT PSEUDORANGE] data with Kalman Filter again?

I have a projected data in northing, easting, elevation that came from a GPS receiver fitted on a Pipeline Inspection Gauge (PIG). (I do not have the raw data at all) This PIG collected the GPS data ...
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0answers
33 views

How do I convert IGb08 coordinates into an ECEF frame?

I'm relatively new at GPS positioning, and have come across precise orbital calculation files here. I've parsed the sp3 files and gotten the values into something I can work with, but I don't know ...
2
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1answer
155 views

Automatically add points geometry while GPS logging?

I have a PostgreSQL 10 Server (x64) running on my Windows 8 (x64 based) machine. On the top of my Postgres database, there is PostgREST API running that receives GPS data (5 seconds interval) from a ...
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2answers
57 views

Comparing several values within each cell of a DEM

I am working with a DEM and got a GPS line of my working area. I converted the GPS line into single measurement points. Now I want to compare each of these GPS points with the corresponding elevation ...
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1answer
38 views

Using rtklib with GnssLogger input?

How should I use GnssLogger output with rtklib to compute the location? rtklib (rekrcv) gets RTCM as input, and GnssLogger output is proprietary. How do I connect these 2 tools?
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0answers
20 views

Receiving strange characters from GPS tracker, is this HEX or binary?

I am struggling with a GSM GPS tracker. It looks like a clone of GT02A, and it is a relatively common model. My problem is that when it sends data to my server, it is not readable. I set it to send ...
2
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1answer
140 views

Iterating over column from CSV using pandas? [closed]

The problem that I am experiencing is as following: I have a csv with the following columns: 'time' (with date and time), 'id', 'lat', and 'long'. The data shows movements and id represents a mobile ...
3
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1answer
200 views

Converting the local coordinates to GPS (lat, long)

I am having the XYZ points in some local coordinate frame. Each point I have, can also be represented as the distance from the origin and the azimuth angle it makes with one of the horizontal axis. I ...
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1answer
26 views

Adding information of a shapefile to a GPS coordinate

I am using ArcMap 10.6.1 and I am currently trying to add information to a GPS coordinate. This coordinate (red) lies within a shape from a shapefile, and the shapefile as some attributes (yellow box)....
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0answers
53 views

Can I correct position data from a device suffering from the 4/6/19 roll-over problem?

I work for a company that sells apparatus containing GPS receivers. Over the years a lot of this gear has been sold and deployed. A number of machines in the field contain GPS receivers that feature ...
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34 views

Getting GPS coordinates of an ending point based on a specific road, a starting point and length

In an Excel file, through VBA, I would like to have the GPS coordinates of a certain point, starting from the previous known point and the length of a specific highway (or a road). I mean a "delta" ...
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0answers
29 views

Calculating satellite position in lat, lon given the position of receiver, altitude of satellite, azimuth and elevation angles

I want to calculate position of a satellite, given the position of the receiver, azimuth,elevation angles and height above ellipsoid for the satellite. I think this should be a simple geometry problem ...
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1answer
50 views

Fast road snapping for big data

I hope this question is not too general. I'm dealing with a lot of data from vehicles (1.000.000 GPS points per day) and I want to snap the data to a big city's street network. The timely order is not ...
2
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1answer
114 views

How long is a GPS epoch in microseconds?

My GPS is reporting dates from the previous epoch. How many microseconds should I add to the date to get the correct value? Since the 2019 GPS Week Number Rollover, my old GPS logger (QStarz BT-...
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1answer
41 views

Infering course given origin and destination coordinates

I have two points. A vehicle is at point A and I have the coordinates at point A. The vehicle moves to point B and I know the coordinates as well. I would like to find the angle of movement i.e., 0,...
3
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1answer
63 views

Combining GPS and WiFi geolocation

I see that Google combines GPS with WiFi geolocation results to increase location accuracy. Does anyone know how it's done? How is WiFi information useful when it can have 10m+ accuracy? Is it only ...
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0answers
51 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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0answers
20 views

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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0answers
162 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
46 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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0answers
43 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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0answers
45 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 ...