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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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25 views

GPS coordinates to XYZ on relative grid

This has kind of been asked before in different ways, but I'm struggling to adapt the answers to my specific scenario. Say I have a ground station and a plane in the sky. I know the GPS lat, lon, and ...
4
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1answer
41 views

FCC Galileo Waiver: What does it mean in practice? [on hold]

Today the FCC approved the use of Galileo navigation satellites in the United States. According to gps.gov, The Federal Communications Commission (FCC) rules require licensing of non-federal ...
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13 views

Seeking API for reading RINEX file?

Is there an API service for reading and processing the RINEX file of GPS data? I searched online, but I was not able to find one.
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0answers
50 views

Very different static gps tests for different devices

I don't understand the results that I got when I measured with three different devices that were lying on the ground for couple of hours. These devices were: Nexus 10 tablet, Samsung Galaxy Core Prime ...
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1answer
25 views

Mapping local history

I have been working almost half a year now trying to create a modern digital map of the local towns protected historical silver mines. The only GOOD map over the mines dates back to 1794. A new map ...
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18 views

Steps and tricks on imporoving smartphone GPS accuracy [closed]

I am not sure if this is right place to ask but ill ask anyways. My team have been proposed by a third party to make an application that requires an accurate GPS location (idealy 10mm accuracy, but ...
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1answer
18 views

Overlaying NSIDC sea ice extent data with movebank animal tag data in R? [closed]

I am fairly new to GIS data and was wondering if there were any R packages or example scripts for overlaying animal GPS data (from movebank) and sea ice concentrations from NSIDC on a map for a ...
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1answer
28 views

What are the available global GNSS corrections?

How can I find out what GNSS corrections are available in a location? For example, in the United Arab Emirates (24°03'22.8"N 55°46'42.9"E) what corrections are available to me assuming I have the ...
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1answer
34 views

GNSS accuracy, what is it?

Using a Trimble GeoExplorer 6000 Series GeoXT Handheld, I recorded uncorrected GNSS positions, for example: Horizontal estimated accuracy in the field 4 meters. Vertical estimated accuracy in the ...
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1answer
27 views

How to number my GPS points sequentially?

I want to number my GPS points from the first point to the final point, the first point is 1, second point is 2.... is there any plugin or toolbox I can use? I used the plugin (sort and number),...
2
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1answer
42 views

How to customize the appearance of OSM maps on Garmin GPS device?

Just downloaded my first OSM map onto my Garmin etrex 30x from http://garmin.openstreetmap.nl/. I always liked the extremly fine level of detail of OSM, as compared to other maps I know it contains ...
2
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1answer
29 views

Does longitude/latitude info come directly from GNSS chip on Android devices?

I'm trying to directly communicate with the GNSS chip on my device and I am not clear whether the RAW GNSS information is coming directly from the GNSS chip or not. I have used the application ...
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28 views

Free GPS data (x, y, z) of an agricultural field

for a project at the university I need GPS coordinates of an agricultural field. I know, the longitude and latitude are trivial, but I'm especially interested in height values. Is there any source, ...
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23 views

Garmin Nuvi 5000 suddenly has wrong time

This happened last weekend or so (10/20/2018). The company I work for makes locked maps for the Garmin Nuvi 5000s. Over the weekend, they suddenly became unable to unlock maps. We've noticed the time ...
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0answers
17 views

Garmin GPSMap 64S deleting waypoints?

So I'll start off by saying I'm still in the rookie stages of GIS work. But I have a GPSMap 64S and for work I had to go out and collect waypoints of an area. No problem, all was good and well, got ...
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1answer
73 views

Can GNSS precision be improved with a local atomic clock?

Does the use of a local atomic clock improve the accuracy for position determination with existing GNSS?
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14 views

Android GNSS Status App with Trimble R2 and custom app

I was wondering if anyone had a little more detail about how connecting a Trimble R2 to an Android device using Bluetooth through the GNSS Status app and turning on Mock Locations works? I have a ...
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0answers
27 views

Realtime GPS tracking of multiple vehicles using Rasberry Pi (offline map)

Is it possible to plot multiple realtime markers, on a single map, using GPS data (NMEA data) from an offline database that is constantly updated? The GPS data is provided by several Rasberry Pis ...
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0answers
27 views

How to get the nearest distance by two point

I'm new here to learn QGIS, But I find some problem that I cant solve, I have two gps data and I add them to Qgis, I connect the points by using Point2One, each of them own more than 1000 points, I ...
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26 views

QGIS GPS information do not show elevation and other data

A little disappointed not to find an application that works for me. I give myself the task of developing it myself. I find the problem that QGIS does not show me some data, and the elevation is what ...
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0answers
34 views

Using GPS tools to access GPS information in QGIS?

I'm having a problem obtaining live GPS information in QGIS. If I connect automatically, it gives me the message that it is connected, but still I do not get any GPS information. I'm plugged to a ...
3
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1answer
33 views

Incorrect address mapping in Google Maps and Google Earth?

We were issued a 911 address when we built our building approximately 3 years ago. When you go to google maps and google earth and put our address it incorrectly pulls up in town. The correct ...
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0answers
15 views

Failing in Current GPS location in Q Field

I made a project in QGIS (desktop) with a point layer and a basemap from Mapsurfer. As I'm working in Portugal, I am using for project and layer CRS EPSG:3763 - ERTS89/Portugal TM06. Then I make the ...
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1answer
31 views

Can Qfield be used with external GNSS service?

I'm currently testing an external GNSS service on my mobile device. It produces RTK corrected GNSS signal that is distributed over bluetooth as NMEA format. Is Qfield able to read an external GNSS ...
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0answers
21 views

GPS track reconstruction using acceleration and heading [closed]

I'm currently working with a huge amount of GPS tracks from vehicles. Looking at the data I noticed something interesting : I have a GPS position + timestamp every 10 seconds (which is not a lot) but ...
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0answers
28 views

Calculating turn rate in GPS track data? [duplicate]

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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1answer
21 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
63 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 ...
0
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1answer
52 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
62 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
108 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 ...
1
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1answer
19 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?
2
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1answer
105 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
94 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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0answers
40 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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0answers
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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0answers
29 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 (...
4
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2answers
243 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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0answers
44 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 ...
0
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1answer
15 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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0answers
15 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 ...
1
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1answer
77 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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0answers
45 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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0answers
22 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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0answers
38 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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0answers
42 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 ...
1
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1answer
76 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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0answers
34 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/...
3
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1answer
92 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 ...
3
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1answer
292 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 ...