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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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85 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 ...
141 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 ...
325 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,...
234 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 ...
71 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 ...
48 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 + ...
31 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 ...
87 views

### Hardware for Surveying and mapping total station

Is "Microsoft Windows CE 6.0 / Magnet Field" operating system the sole property of TOPCON total station or it can be found in other total stations as well?
6k 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 ...
271 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 ...
104 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 ...
26 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 ...
3k views

### Convert xy coordinates into GPS coordinates

I have quite a large dataset with only a x and y coordinate which came from a program that is no longer usable. However I have the GPS coordinates of a few xy coordinates: | place | X | Y | ...
48 views

### Merging multiple concurrent gps tracks

I have GPS tracks from 2 or more devices in multiple vehicles. At least one device reports the vehicle's position to a webui approximately every 5 seconds assuming that it has a cellular data ...
29 views

### Pathfinder Office - how to tell if an external antenna was used with GPS

Does pathfinder office store the antenna name in any of the log files? I'm trying to go back and compare old files to determine if data collected with an external antenna did any better than those ...
8k views

### What is a GPS epoch?

What is a GPS epoch? I encounter this often in technical discussions and it does not have a clear meaning to me. Lately it was used in this post and it seems to mean the receiver update rate (the ...
522 views

### Rinex Header GPS Position Coordinate System

I am extracting data from rinex observation files and would like to convert the approximate position to latitude and longitude using Proj.4. The rinex standard states that these coordinates are WGS84, ...
78 views

### Can navigation apps use compass and orientation sensors to improve reactivity and accuracy? [closed]

I've had the impression that Google Maps provides more accurate walking navigation on Android devices which include a compass in addition to a 3-axis accelerometer and GPS receiver. Perhaps this is ...
516 views

### MySQL GPS distance calculation is failing

MySQL 5.6 here. I'm storing GPS coordinates as MySQL Point types in my DB and am trying to build a query that takes a single GPS coordinate (consisting of latitude and longitude components) and ...
92 views

### Problems when converting KML files to GPX

Looking at the KML and the GPX file that I created (in QGIS through 'Save as'), in QGIS it looks as if the lines are all right (picture 1), but when I open it in another type of GPS program like ...
22 views

### How do I make sure when importing x and y data that they are in the same coordinate system as my basemap?

I have an ArcMap basemap of Britain which has a coordinate system which is National Grid. I am trying to import a spreadsheet of coordinates of sites across Britain which are in decimal degrees (eg 50....
371 views

### What is the maximum theoretical refresh rate for GPS [closed]

I understand that most devices have 1 Hz refresh rate for GPS positioning. I tried to read about the actual GPS implementation but I could not figure out how often the location can be determined. ...
1k views

### Display GPX file on a GPSmap 62s GPS device

I have to do a regular survey and for that I have produced a grid on QGIS 3.0 (Girona) After producing the (vector) grid I save it as a GPX file (as proposed) I Saw that the GPX_USE_EXTENSIONS ...
411 views

### Georeferencing terrestrial LiDAR point cloud?

Recently I took a Faro Focus terrestrial laser scanner to a forested area and collected multiple scans for 12 fixed radius plots. Each plot had 5 GPS points collected within it in hopes to ...
56 views

### Translation Vector effect in the 2D transformation of GPS Network into a local system

For a project of Bridge monitoring using GPS, (X,Y) GPS measurements have taken and they must be transformed into a local system (x,y) to determine the deformation as shown in the sample picture: For ...
226 views

### Finding GPS coordinates of point located between 2 known meridians?

I need to solve this task. How to find GPS coordinates of a point which is 1029.96033 km from prime meridian and 747.67936 km from 25th meridian, using WGS84 standard. It is a particular task but I ...
89 views

### Aerial Triangulation by using GPS height

Is it possible to use GPS geographic coordinates & ellipsoidal height not orthometric heights in Aerial Triangulation?
130 views

### Obtaining attribute data at given GPS coordinates?

I have a csv file containing information at given lat and lon GPS coordinates, as well as a shapefile containing, among other things, annual average daily traffic (AADT) values along stretches of road ...
81 views

### Garmin data to CSV to SHAPE on ios

I'm new to working with gis software. I've always been a field guy who sends all his data in to the office for processing. However I am trying it myself and have ran into problems pretty early on. ...
982 views

### Using Intersect to find where line crosses itself in ArcGIS Desktop?

Can I not generate point features where a line feature intersects itself by using the Intersect tool? I try using it with just one line input but when I run it I get a warning saying the output ...
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 ...
72 views

### Where exactly is the GPS position located on a GPS device?

I have a very precise GPS which in theory when using RTK achieves 2cm accuracy when reporting its GPS position. But where exactly on the GPS device is this position? In other words, when the GPS ...
166 views

### Age of RTK corrections - fixed solution accuracy

Does anyone know how the age of NTRIP corrections influences accuracy of an RTK solution? I read somewhere that correction loss for few seconds or even a minute may still be acceptable for some ...
1k views

### Postprocessing with NMEA-data if no rinex-data is available

I have an UAV which does not give me the raw sensor data (e.g. rinex or ubx). The only format I get is NMEA. Now I want to know how could I use the NMEA-data to get the highest precision of my ...
37 views

### Export tracklog from GPS information panel [duplicate]

When I use QGIS on the field, I always turn the tracklog on in the "GPS information" panel. So the tracklog is showed as I walk with the GPS on, but I can't find the way to download this track into a ...
202 views

### Processing GPS data before map matching using R?

I have GPS data collected with a smartphone app for all travel modes (e.g., car, bike, walking, transit). Trips were detected by the app (so I have trip_id in the data). In theory, each point is ...
84 views

### How can I change QGIS GPS tracker symbol?

I may look stupid, but can't the find place where I can change GPS live tracking symbol. I use GPS tool in fieldworks with forest orthophotos and default symbol that displays my location (black circle ...
3k views

### Why are Galileo satellites inaccessible in USA?

I see that some (or all?) Android devices that support Galileo global positioning system are deliberately programmed to self-disable their Galileo support when used in USA or US territories. This ...
820 views

### Does a GPX file contain infomation of the track color?

I am trying to open a gpx file in Qgis, with works just fine. the problem however is that it contains multply tracks. When I walk my tracks in the app "Galileo", I give the tracks specific colors. Can ...
831 views

### Is the 180 west the same as 180 east?

I had a discussion about this topic with a co-worker. We are working implementing a GPS validation system, and I told him the longitude -180 (or 180W) is not a valid longitude because a valid ...
795 views

### Connecting Trimble Geo7x to ArcCollector

I'm looking to link a Trimle Geo7x GPS unit to ArcCollector on Ipad or Windows 10. Is there a way to link these these devices easily or do they not play well together?
504 views

### DGPS post-processed Kinematic (PPK)

I did a dGPS survey last summer. Unfortunately, we didn't have a base station. So I did my survey in post-processed Kinematic PPK mode. Because we borrowed the equipment, we don't have access to post-...
358 views

### Leica Geo Office Cannot Process Data?

I have imported base and rover data to Leica Geo Office and did a selection to the reference and rover station in the GPS-Processing Tab. Why are the Process button and Data Processing parameters ...
52 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 ...
467 views

### GPRMC date field overflow

I'm decoding NMEA GPRMC sentences from a GPS device. The date field format is ddmmyy. So 191194 is 19 November 1994. This makes it impossible to represent years greater than 1999. Has the spec been ...
373 views

### how to convert shapefile in gpx route not gpx waypoints

When I do "save as gpx", it creates a gpx file with waypoints only, although I force route and track. Besides other non-gpx schema columns all relavant gpx columns exist based on a attribute table ...
78 views

### Oracle Locator Features

I have a road network (in shapefile) which is in a projected system (e.g. EPSG:2100). I also have a number of GPS files in WGS84. I have already stored the data into Oracle 12c (Oracle Database 12c ...
102 views

### “Average” GPS distances between TrackPoints?

I have a few thousands of GPS tracks (from and for recreational use) and I would like to sort those that were produced by a GPS on the field from those that were drawn (on-line on Google Earth or any ...