Questions tagged [gps]

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

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46 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
125 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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102 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 ...
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33 views

Accurately tracking location in outback? [closed]

I am looking for a way to efficiently track my whereabouts/tracks whilst traveling through the Australian bushland. In the past, I've just recorded my longitudes and latitudes from a basic GPS onto a ...
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2answers
198 views

QGIS: How to store the GPS coordinates in the attribute table? [duplicate]

I got vector points on a map. I already have the elevation information in the table for each vector point and the point-id. Now I want to get the GPS coordinates for each point stored in this ...
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128 views

Reasoning behind GPS time week number?

So the GPS Week Number rollover has been all over the news lately. I don't really know anything about GPS, but my first thought upon reading up on this topic was: why use a week-based format in the ...
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11 views

Ensuring a public Ntrip caster tracks the same satellites as you

dGPS requires two receivers to track the same satellites simultaneously. When one of the receivers is a Ntrip caster, what is the canonical approach to ensure your receiver tracks the same satellites/...
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52 views

Reading RINEX formatted streams

I'm playing around with a public NTRIP caster but I'm very new to all this. I'm using BKG Ntrip Client to read the stream and the file I get has around 45 lines for each sample. Each line begins with ...
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147 views

Difficulty in getting QGIS to connect with in-built GPS (COM3 NMEA port)

I have a Motion J3500 rugged tablet which was upgraded last year to run Windows 10. The tablet has a built-in GPS / broadband module (Gobi Sierra 2000). I use QGIS (v3.2) on the tablet, with the GPS ...
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50 views

Getting authentic and verified current location of user?

I am building an application that needs a user to send his current location. However, since GPS signals can be faked. I need the user current location to be authentic and verified. I thought of ...
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47 views

What GPS geographic coordinate system is this?

I received a couple of gps data on animal movements from a research paper but was unable to recognize the format and map it. Any idea what format these GPS coordinates are? The GPS locations should ...
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69 views

Spatial-analyst, detecting bad ones from good positions GPS coordinates with QGIS?

I'm curious if someone else has been thru this problem and how it was solved. Many years back people marked the position manually on a map to get waypoints of for example electric wire connection ...
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94 views

Easiest way to translate live GPS to realtime GTFS? [closed]

I have live GPS data coming in from the city's buses and given that I already have the routes in GTFS ( https://developers.google.com/transit/gtfs/reference/ ) I would like to convert this data to the ...
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3k views

How to fix 'GeoSeries' object has no attribute '_geom'

I'm working on a python script whose goal is to detect if a point is out of a row of points (gps statement from an agricultural machine). To do this, my idea is to make a buffer around the 10 points ...
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74 views

Seeking code sample or pointer showing how to calculate Corner Coordinates of JPG file based on EXIF GPS data? [closed]

This is a follow up to this question: Using GDAL to extract Corner Coordinates based on a jpg file's GPS EXIF data? Per the answer I received to the above question, gdal_merge cannot merge JPG ...
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161 views

Converting GPS data to KML?

I have some waypoints, and I need to input them into Google Earth. How can I convert data from GPS to KML file?
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228 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 ...
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1answer
143 views

Decimal degree coordinates plotting incorrectly on basemap in ArcMap

I'm trying to plot some GPS coordinates onto the World Light Gray Canvas basemap, but they are not showing up near the correct location (Ecuador). I uploaded a shapefile for Ecuador which did show up ...
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1answer
446 views

QGIS live GPS data via internal GPS (Durabook, Windows 10)

I have a Tablet (Darebook with Windows 10) on which I installed QGIS (v. 2.8)  So I tried to do the "live GPS tracking" with internal GPS (Sierra wireless sensor). Next, from the menu of QGIS I went ...
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31 views

What is the sIgnificance of equator in GPS offset calculation?

I am going through a SAE document where it says that the GPS offsets (NodeLL) should be calculated in such a way that the range should be within one of these: ranges of +- 0.0008191 degrees ranges of ...
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1answer
44 views

Using remote controlled jeep to gather data points? [closed]

Is it possible to use a small remote controlled jeep or truck - 18" long or so - with some kind of GPS device attached to it to gather data for a detailed topo map of a 2 acre parcel that I just ...
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1answer
2k views

How precise is GPS?

Most search results I get on this talk about the accuracy, that is how close the locations outputted by the GPS are to the real positions, of GPS. However, I'm working on a project that only requires ...
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59 views

Identifying counties further than ten miles from bank using ArcGIS Desktop?

If I have the latitude and longitude of all US banks. How can I identify counties whose center is ten miles or further from any bank using that data?
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1answer
94 views

LiDAR data in GPS time, only in second. Missing week?

I have LiDAR data LiDAR Data captured, unsure what units or format this time field is in? which I learned that my LiDAR data is in GPS second, however I do not have a column of data which shows the ...
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1answer
58 views

LiDAR Data captured, unsure what units or format this time field is in?

I haven't been able to figure out or find out from searching around what units or format this time field is in my LiDAR data that was collected?
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3answers
134 views

GPS waypoints are giving me different coordinates once transformed into proper coordinate system?

I recently went and collected some waypoints with a GPS that is in NAD27 UTM16N. After uploading the GPX file into QGIS, I saved it as an ESRI shapefile, and changed the CRS from WGS84 to NAD27 UTM16N....
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116 views

Heuristic relationship between number of satellites and GPS precision?

I'm a statistician conducting an analysis on animal movement based on data collected using ATS Wildlink 500 collars. As part of this analysis, I'm estimating GPS error assuming that the error in the ...
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1answer
212 views

What is the practical limit for lat/long measurement accuracy?

There are several systems for finding lat/long coordinates. This includes GPS satellites, DoD TRANSIT, Russian GLONASS, Galileo, differential GPS, LORAN, land-based systems, and more. Maybe even using ...
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2answers
528 views

Where does the Geoid information in a GPS unit come from?

In the NMEA GGA-message the 11th field is Geoid separation. How does the GPS-unit "know" this separation? Are GPS units preloaded with an EGM (Earth Gravitational Model)?
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90 views

Importing Several Latitude and longitude Points From a Smartphone App into a CSV File

I am using a GPS App on Android that export my location as a latitude and longitude values. For each location it exporting a separate data set: Latitude (LAT): 32.05796 N 32°3'28.6578" Longitude ...
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1k views

Calculation between Raw GPS data to latitude,longitude points?

I am working on the GPS related project. The objective is to understand the calculation process of the raw GPS data (server side calculation). It means " How did we get the latitude and the longitude ...
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1k 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 ...
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1answer
131 views

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

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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85 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
31 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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58 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
93 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
57 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),...
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2answers
323 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 ...
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1answer
100 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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92 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
88 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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1answer
4k 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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1answer
221 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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45 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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1answer
41 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
148 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
270 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
658 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 ...