Questions tagged [gps]

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

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14 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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10 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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11 views

Using Geotagging AR in an app [closed]

Normally I see geotagging used in reference to photo applications, allowing people to see where a photo was taken. I want to use geotagging as an augmented reality application on a smartphone. The ...
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23 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 ...
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150 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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47 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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26 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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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 ...
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1answer
77 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 ...
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1answer
144 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
25 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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49 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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28 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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21 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
33 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 ...
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47 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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38 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,...
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53 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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40 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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18 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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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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34 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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40 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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36 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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15 views

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
46 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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57 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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49 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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88 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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1answer
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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22 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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39 views

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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42 views

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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35 views

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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89 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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23 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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74 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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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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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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37 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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13 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
105 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
25 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
43 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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89 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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190 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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19 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
55 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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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
62 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 ...