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

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Finding outliers in GPS track data

I have GPS track data and for each point have a latitude, longitude, and a timestamp. In most cases, the time between points is just a few seconds but it varies. I've flagged some of the GPS points ...
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14 views

'Regular Points' vector layer in Bonn

I've downloaded the bonn version of QGIS. Using the 'regular points' vector analysis tool, I've set some 5m regular points over a field so that I can use the x,y coordinates to plot them and measure ...
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1answer
53 views

How are the minimum X, maximum X, minimum Y and maximum Y coordinates calculated for a state's county?

I am working with the eBird API. The eBird website is where birders from around the world enter lists of species for a specific location. The one API endpoint I was trying to work with returns data ...
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1answer
40 views

ECEF to relative displacement in meters

I have GPS NMEA (National Marine Electronics Association) data that I collected being stationary and I can see the displacement of 4 meters just by looking at GPX data uploaded to google maps. I am ...
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2answers
42 views

Auto generating waypoints to a GPX file along track (hiking path - not as crow flies)

I have used Google Maps to build a list of waypoints for a trail I want to hike but the waypoints are simply my start, end and maybe a couple of points of interest for my day and any campgrounds along ...
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1answer
42 views

Get direction on a laptop with Google Maps

I have a laptop (Windows) in a car and I want to use it with Google Maps to get my directions. Unfortunately, it's not always the same person who uses the car, and all the user of the car don't have ...
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1answer
15 views

Creating 2 symbology in the same layer on Mapinfo [closed]

New to MapInfo, I would like to create a High voltage layer with two different attributes (11 and 6.6) representing by two different colours on MapInfo. How can I do that?
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1answer
78 views

Use QGIS or QField with a GPS physically walk a polygon in the field

Is it possible to use QGIS or QField with a GPS to physically walk a polygon in the field? I'd like to use the software to physically walk shapes in the field but have been unable to find information ...
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1answer
31 views

How external GPS can feed HTML5 geolocation API for django-leaflet

My goal is the following: I'm developing a Django project. The goal is to locate places with a form. I'm using a CreateView generic view (maybe I should create it manually for more customization. 3 ...
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29 views

How to Increase GPS accuracy using only Latitude,Longitude and timestamps

We are building distance tracking devices and due to GPS lock error, we are not able to measure the distance correctly. Things tried: getting latitude-longitude with time stamps. tried using Kalman ...
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4 views

LNav Subframe 4 Page 18 Day Number bit range

Per the ICD, I know that the effective range of the Day Number in Subframe 4 Page 18 is 7 (represented using 8 bits), but do the bits actually coming in go from 0-6 (00000000 - 00000110) or from 1-7 (...
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26 views

Determine geograpic coordinates from one fixed location as accurately as possible without expensive hardware

I build a GPS disciplined oscillator and I need to set antenna coordinates in order to be able to operate it as accurately as possible. What I need is a way to determine the geographic coordinates (...
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2answers
117 views

Surveys showing GPS accuracy in different models of smartphones?

Are there any surveys that give accuracy in meters for different smartphones (e.g, iPhone 6: 8 meters, Samsung Galaxy S8: 7 meters) regardless of what the statistical method is being used?
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27 views

GPS Pathfinder Office - Carrier Correcting Fails

I am have an issue post-processing my GPS data with Pathfinder Office and am hoping someone may have a solution/advice. Specifically, a percentage of or all of my positions fail to carrier correct. I ...
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1answer
12 views

Check is an asset (GPS route) has been on restricted road

If I have GPS route for an asset and want to cross check the position of the asset against (pre-defined) "illegal" routes to have taken (series of GPS decimal), what might be a reasonable approach? My ...
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14 views

NetworkX - Indexed Spatial node queries?

I'm trying to extract a Road Network from a large set of GPS point data gathered from vehicles. I plan on representing the final network in terms of a NetworkX graph of G(V,E) I have implemented ...
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1answer
26 views

How to improve the accuracy of geolocation on openlayers 5

I wonder if it is possible to improve the accuracy of geolocation on openlayers 5, currently it is off by 5000 meters although I enabled highaccuracy option. var geolocation = new ol.Geolocation({ ...
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25 views

GT06 Keep Sending Login and Heartbeat Packet

I am creating a GPS track application in Java via scoket programming. After setting up everything, recived login packet and sent response by my server. After sending response GPS sending heartbeat ...
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18 views

How to create log file for GPS

I am using Globsat bu-353s4 USB GPS receiver connected with Raspberry pi 3. How do I create a log file of GPS for debugging purpose? I already have the NMEA data but the lat-long returned is wrong ...
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19 views

How to view Ephemeris and Almanac data in my GPS Receiver

I am working on GPS. I am new to it. I am using Globsat bu 353s4 USB GPS receiver connected to raspberry pi. I am interested in seeing the Ephemeris and Almanac data that are downloaded by my USB-GPS ...
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30 views

leaflet rastercoords how to change the map coordinates

I am trying to use leaflet-rastercoords library to make an interactive map. Now everything is running well but I need to change the starting point of the image so that when I call project or unproject ...
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28 views

RTKLIB PPP algorithm against Single point poisitioning

I've been looking for a standalone single frequency carrier-phase based positioning method and I found out PPP (I know it's not the same). According to literature, the main issue of the carrier-phase ...
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18 views

Formula to calculate DGPS correction factors

I am trying to implement a differential GPS algorithm. During my research, I found a paper at https://opus.bibliothek.uni-wuerzburg.de/opus4-wuerzburg/frontdoor/deliver/index/docId/11361/file/...
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1answer
56 views

What exactly is an RTK GNSS receiver?

I have seen many GNSS/INS sensors come with "RTK GNSS receivers" which enable you to achieve RTK. I have been looking at the sensor I have got which claims to be RTK capable, the user manual says it ...
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1answer
192 views

What file format has 18n, 18g and 18o file extensions?

My professor (who is now unreachable on holiday) gave me files to work with for a mapping project. The files were retrieved from the Ordinance Survey Ireland webpage. They were used to differentially ...
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5 views

Check GPS Tracklog State in ArcPad

How do I check if the tracklog is on or not? I know you can toggle the state of it with: Application.ExecuteCommand("gpstracklog") and while you can turn the GPS "on/off" with this syntax: ...
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36 views

Autonomous GPS navigation issues

I am trying to achieve autonomous GPS navigation on my RC car. I am using a very high quality GNSS/INS sensor (Advanced Navigation Spatial), from which I am getting lat, long and heading values. The ...
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13 views

For a GPS receiver, what is the difference between tracking and traking with data?

I have came across the following instruction manual: http://aviationandaccessories.tpub.com/TM-1-1510-225-10/css/TM-1-1510-225-10_388.htm I have seen this kninf state numbering in a different ...
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72 views

Receiving Data From GPS GT06 in java

Am developing a fleet application where i need to track my vehicle movement. and store into mysql db. Am using gt06 gps with a sim card. Created a java file for checking that gps is sending the data ...
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20 views

RTK GPS Surveying

My RTK GPS surveying setup uses two Topcon HiPer V antennas, running Pocket 3D on a FC-5000 tablet. Over the past year I have taken 274 shots on the water's edge (to get the lake level) and there have ...
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1answer
31 views

What is accurate GLONASS?

As I know, GPS gives accurate data for everyone. I've heard GLONASS have two types of data. High precision data available only for the Military. Low precision data for civilians. İs there an ...
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1answer
52 views

Accuracy error between Trimble RTK and Juniper Geode GPSS systems

I have set up a system for surveying points with a Juniper Geode GPSS because the survey team is too busy to do it themselves. There is a consistent shift to the northeast of the coordinates I am ...
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1answer
76 views

Openlayers 4 Geolocation is not working

geolocation: function () { var self = this; self.geo = new ol.Geolocation({ trackingOptions: { enableHighAccuracy: true }, projection: self.Map.olMap....
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20 views

Performing GPS data analysis on Android Location?

I am currently writing an application for android and am saving the users location to an database. The data consists of: Lat/Long Timestamp in millis Accuracy (estimated horizontal accuracy of this ...
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2answers
61 views

Accurate GPS apps for smartphones available? [closed]

I'm working on a project where we need to make accurate GPS measurements and the required precision would be in centimeter level. I've been doing some searching and not yet found any solid solutions ...
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2answers
99 views

What is GNSS Accuracy on a GPS?

What is GNSS Accuracy on a GPS? Is it like if the GNSS accuracy gets lower (3-5m) then the distance from the object you are taking the coordinate increase as compared to a GNSS accuracy of (1-100cm)??
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277 views

Coordinate converter in R (GPS, DMS, dd, etc.)

There is probably a way to do this, but I can't find a way to transform a GPS DMS format to degree decimal in R. e.g. from GPS coordinate, see below, is there a way to transform this in R? gps....
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2answers
39 views

DGPS for Single Epoch?

Usually for post processing DGPS in any technique (RTK - Carrier phase, Pseudorange code) the RINEX files used contains data for many consecutive epochs. This leads to very large RINEX files. Is it ...
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1answer
30 views

DGPS Pseudorange code vs Carrier phase: What fields from the RINEX actually used?

The basic RINEX epoch measurement looks like: Pseudorange, Carrier phase, Doppler, SNR (In that order?) Is this correct for post processing: Using Pseudorange code technique (RTKLIB positioning ...
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1answer
60 views

Satellite data to position coordinates

Is there a step by step process to convert sets of raw satellite data to traditional GPS lat/long points or a website that takes the data and processes it? Example of the raw satellite data: $GPS30,...
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1answer
41 views

Trimble 7X GNSS point Z returns negative elevations

I have a newly acquired Trimble 7X (with a centimeter kit). I collected a point in an area with a clear view of the sky. The accuracy indicator showed 1" accuracy and post processing and a ...
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40 views

Trimble coordinates in field not accurate

I am using a Trimble Juno 3E and when I load the points taken in the field on GIS, it is off by a metre or so from the actual object (It doesnt fall on the exact object location). Any help to improve ...
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1answer
47 views

Can not solve Kramberg equation

The problem is posed as follows: "There are 5 satellites, need to find the points: x,y,z." There is an equation: 23 ^ 2 = (x-12) ^ 2 + (y-25) ^ 2 + (z-24) ^ 2 25 ^ 2 = (x-(-53)) ^ 2 + (y-19) ^ 2 + ...
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24 views

Finding GPS points on road segments [duplicate]

I have a set of road shapes (ROAD.zip) and lots of points which belong to a taxi in Beijing (txt files). Each shape (segment) has a unique number. I want to find the points on road segment and assign ...
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36 views

GPS connection setup in ArcGIS Desktop?

I bought a Panasonic Toughpad fz-g1 with GPS module but can't get it to work properly in ArcGIS 10.3. The GPS works but shows me the wrong position. And it is about the same position no matter what ...
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2answers
656 views

GNSS raw measurements on Android: Does real time/post processing Differential techniques possible?

In the recent months we all saw kind of breakthrough in Android Smartphone GNSS receivers: GNSS raw measurements are now accessible, and this is significant since those are the most common form of ...
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72 views

Yaw rate calculation from heading

I have a GPS log where speed, heading are obtained every 100ms. I would like to calculate yaw rate with this. Can I get the method, algorithm or formula to calculate the same? I understand using ...
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9 views

No Michibiki (QZSS) signal

I am using the following GPS module : Datasheet with Rapsberry Pi 3. The datasheet says that the module is compatible with Michibiki (QZS System) launched by Japan. However, in the nmea log , The $...
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1answer
80 views

What's the math behind moving from a starting point in the direction of another one?

I am working with decimal-degree coordinates for a software and lack geographic background. I want to convert the coordinates to a grid to calculate distances and then move around using standard ...
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21 views

Get the current serial protocol config of a TU30-D400 Series GPS

I have an old Jupiter GPS from the TU30-D400 Series When I put its 7th to the GND, I can force it to use the NMEA Protocol with a 4800 baud rate. The thing is that GPS is used by a pretty old tide ...