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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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0answers
12 views

Intramaps Roam GPS_LOG not honoring Tracking settings

I have Roam 2.5.2 and enabled the gps_log layer as discussed here: https://roam-docs.readthedocs.io/en/latest/features/Features-2.1/#gps-logging-and-tracking For most part it works well, however it ...
9
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5answers
18k views

Capturing accurate GPS points using mobile devices

I'm currently working in Vietnam as a climbing guide, but am putting my GIS skills to use by doing a side project for the company involving the mapping of climbing routes. Along with another employee ...
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0answers
20 views

Spatiotemporal GPS Clusters in R [on hold]

My data consists of Latitude, Longitude and time and I need to create clusters with the algorithm >= 8 locations within 50 meters within 24 hours. Is there any R package and function that can do ...
9
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1answer
2k views

Examples of GIS or Remote Sensing in movies

Looking for examples where GIS or RS has been a part of a movie plot. I'm trying to put together a "GIS & RS and the Cinema" class, in which examples of GIS & RS are shown. Those examples will ...
0
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1answer
26 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 ...
4
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1answer
39 views

Relationship between Android bearing and iOS course?

I'm a mobile developer working on an Android and iOS app that displays the user's location and various POIs on a map. I've been comparing the location objects that I get back from Android and iOS and ...
2
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1answer
30 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 ...
1
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0answers
36 views

GPS coordinates are not matching up with street network shapefile despite having same projection

As some background, my colleagues and I used a shapefile of a city's streets as a reference to collect GPS data. They were written simply with a field for: street name, lat, and long. The many points ...
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0answers
29 views

How to separate journeys from GPS traces using ArcGIS/ QGIS?

I am facing a GPS Data Preprocessing problem. I have GPS traces of buses which traveled from one place (bus station) to another. This file contains relevant (eg:- Data recorded between the starting ...
6
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3answers
1k views

How can I add 3 axis orientation information to my photos?

I have a survey project where I need to record not only the location, but the direction (bearing and angle of elevation/depression) that the camera was pointing at the time the picture was taken. ...
3
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1answer
67 views

Cleaning GPS tracks from large jump / outliers

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 ...
1
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1answer
51 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 ...
1
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1answer
96 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 ...
2
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1answer
33 views

How can I count the number of countries my GPS data fall into?

I'm working with GPS data in R from different studies and would like to list the countries that each study covers. I can easily map the data using leaflet but I'm not sure how to extract the countries....
1
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2answers
2k views

Automating production of GPS-compatible map tiles from georeferenced raster maps [closed]

I have a set of TIFF maps that I want to load onto Garmin GPS 62s units. The maximum size for each tile on the GPS is 3Mb and less than 1 million pixels. I manually produced one tile, following this ...
2
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1answer
2k views

Maximum GPS-based location Sampling rate of smartphones

I am working on Android application that needs to take GPS locations at the rate of 10Hz to 1Hz. I tried it by setting 100ms for time interval for requestLocationUpdates(_, 100, _, _) function. But ...
2
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2answers
50 views

Ignoring ellipsoidal heights recorded from GPS when only interested in location?

I am not interested in converting ellipsoidal height into AHD heights, because I have a good DEM. However, this whole business about geocentric vs geodesic coordinate systems is thoroughly confusing ...
2
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1answer
61 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 ...
0
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1answer
303 views

External GPS feed for HTML5 geolocation API in 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 ...
3
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1answer
74 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 ...
1
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1answer
51 views

User tracking on a defined route

I am having a vehicle route with a set of latitude and longitude values. User need travel on the specified route, If user deviates from the route (greater than 100 meters), we need to identify in ...
2
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3answers
128 views

Show Duplicate GPS point from CSV file in QGIS

I want to load a *.csv file containing GPS data into QGIS. In my file, there are some duplicate coordinates (two different people living in same household). And I want them to show as two points ...
1
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1answer
33 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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2answers
55 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
30 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? ...
2
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1answer
149 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-...
0
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0answers
9 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 ...
1
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0answers
635 views

GPS data cleaning and sampling of track data?

I have gotten a fairly large polyline-dataset of GPS-recorded tracks. I'd like to have a sample along the tracks for different variables. The problem is that the data has overlapping tracks. This ...
0
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0answers
17 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 ...
0
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2answers
135 views

How much effect does having information from more than 4 satellite increase the accuracy of a 3D fix

I know that a GPS receiver requires at least 4 satellites to locate its position in 3D, and I have read elsewhere that having more than 4 satellites would increase its location accuracy. My question ...
2
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1answer
1k views

Cellphone GPS accuracy standards?

It's my understanding that in 2008, the US government published GPS standards for civilian applications (including cellphones) of rms 4m. Is it correct that this applies to cellphones? and Has ...
1
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1answer
48 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 ...
1
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0answers
18 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 ...
1
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0answers
24 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 ...
1
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0answers
14 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 ...
1
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0answers
28 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 ...
1
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0answers
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 ...
1
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0answers
26 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 ...
1
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0answers
32 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 ...
0
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0answers
9 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 ...
0
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1answer
482 views

Is MATSim useful tool for Taxi fleet simulation?

I am working on a university project and I seek some advice: My project consists in modeling the taxi fleet of a major city and investigating if replacing a percentage of the fleet with electric ...
4
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4answers
2k views

Why is GPS almost unavailable without data connection?

When travelling to foreign countries, ie. when a data connection is unavailable because I don't want to spend big bucks using a roaming data connection, I noticed that GPS is virtually never available....
1
vote
1answer
364 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 ...
2
votes
1answer
172 views

Does GPGGA have leap second correction?

I'm trying to use GPS clocks to synchronize some measurements and I'm a little confused about the leap second correction between GPS time and UTC. I was wondering - does the GPGGA NMEA header have the ...
0
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0answers
19 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 ...
2
votes
0answers
70 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 ...
0
votes
2answers
37 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 ...
0
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2answers
1k views

Mapping raw GPS data to Openstreetmap's Node/Way/Relation [closed]

I have a bunch of raw GPS data points which constitute trips. I want to add semantic information to those data points. For example I'd like to be able to say that a trip consisted of taking street A, ...
2
votes
2answers
502 views

Trimble Pathfinder Differential Correction: ‘Uncorrected’ for block of GPS data

I’ve been collecting GPS point data without problems over the last few months. Recently, on two dates, after using Pathfinder differential correction, the exported records’ Corr_Type changed from ...
0
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0answers
23 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 ...