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

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2
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1answer
34 views

How can I match Geolife traces using TrackMatching or similar tools?

I am working on route prediction and I decide to use realistic trace of moving object, I have choose geolife dataset it is composed of 278 users and every user has its trips presented in GPS or GPX I ...
0
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0answers
19 views

Manually reducing the number of available satellites per epoch in a RINEX observation file

As part of my research I will need to test some GNSS positioning algorithms using only four satellites. To ensure this I've edited a RINEX observation file manually and for every epoch I have only ...
0
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1answer
19 views

Trying to find the manual for a Sokkia GIR1000

I'm trying to track down a manual for a Sokkia GIR1000. My department has one but over the years the manual seems to have disappeared. Does anyone have one or know where I can get one?
1
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1answer
36 views

How to determine the closest feature to my points?

I am doing a research on transportation for motorcycles. For each trips, I have the origin points and the final destination coordinate points. I also have another landuse layer with my points of ...
0
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0answers
60 views

QGIS : How to add points from GPS stream data

I try to place points on QGIS using the GPS plugin but it does not like me. GPS stream is good, I have the read on the data on port com 66, QGIS seems to be good with it since it locates correctly ...
3
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0answers
48 views

Uploading Shapefiles to Garmin?

I am trying to upload shapefile polygons onto my Garmin 60Cx GPS. I use the Trace tool and load shapefiles via Minnesota DNR's application. There are almost always gaps in the shapefile on the GPS, ...
1
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0answers
59 views

GPS Location in Chrome

I am wanting to utilize a high accuracy GNSS position in a GIS data collection application optimized for Chrome running on my Android device. The problem is that the device doesn't have Google Play or ...
0
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0answers
41 views

qgis v2.10.1-Pisa live tracking with gps save track as shapefile

I am using qgis with gps information and a usb gps. within gps information > options > digitizing I have checked the box for "Automatically save added feature" and Track > "Automatically add points". ...
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0answers
182 views

Drawing route on google map using gps device and calculating actual distance?

I Want to draw route on google map with the help of gps device and calculate the actual distance. Can anybody help with this? public GoogleAPIModel GetDistance(string origin, string destination) ...
1
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1answer
55 views

Connect / Disconnect GPS device via PyQGIS

In QGIS I would like to establish a connection to my GPS device programmatically (not via button in the GPS control panel) I found out how to get available ports with QgsGPSDetector i.e. ...
2
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1answer
125 views

Accessing GPS from QGIS 2.14.1/Python 2.7 /Windows10

I would like to access the device described at QGIS live GPS tracking /recommended hardware (GPS USB stick) via QGIS/Python. A gps module does't seem to be part of the standard installation of python ...
0
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1answer
161 views

How to identify a series of Longitude and Latitude coordinates for a building? [closed]

I have hundreds to thousands rows of data that includes the GPS coordinates of the specific location (includes building footprint and outside the building within the property survey boundaries as well ...
1
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1answer
16 views

Discovering gravimetric station data, including location and measurement?

I would like to refine an precision estimate of local gravity based upon current GPS position. Ideally, similar to the National Weather Service API, I would like to interrogate a server with a REST ...
0
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0answers
39 views

Forming a uniform grid of GPS coordinates from a starting GPS coordinate

I'm trying to find a method in which I can form a uniform 2D grid, relative to a starting GPS coordinate. See the diagram below The red point represents the starting GPS Coordinate, which can be ...
2
votes
2answers
175 views

QGIS live GPS tracking /recommended hardware (GPS USB stick)

Is there a list or any other recommendation of certain GPS hardware (esp. GPS USB sticks) working with QGIS? I have been off this topic for far over a decade, and i remember that in former days not ...
1
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0answers
38 views

What technique would I use to translate any GPS coordinate to a grid?

If I wanted to divide the existing GPS coordinate system (lat,long) into a "grid" - effectively reducing its resolution - are there any established techniques, formulas or gotchas that I might benefit ...
1
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0answers
41 views

How can I position gps point on svg (or any other special type if exist) scheme of building?

I have an indoor map of a building in svg and this is an only scheme of a building, there is no google maps or any other maps. But I need positioning (navigation) by gps coordinates in this scheme. ...
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0answers
59 views

Convert GPX/KMZ to google maps directions

Is there a way to convert a set of waypoints in a GPX/KMZ file to driving directions suitable for Google Maps. There are numerous sites listing community generated routes which I am unable to load ...
6
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1answer
68 views

How to improve GPS recording?

The image shows as example a small loop by car, recorded by two Garmin Dakota 10 devices. It seems both devices have had difficulties caused by the surrounding buildings, the "blue one" seemingly had ...
0
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0answers
33 views

Is it possible to use DGPS device to take longitude, latitude and elevation values in local geodetic system (i.e. Indian Geodetic System)?

I want to survey a land in India using Indian Geodetic System (GCS Everest India Nepal ESRI: 37203 or EPSG : 24378). Can I define my own projection system in DGPS, so that it can take values in this ...
5
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2answers
114 views

Are speeds in GPS data obtained by detection or calculation?

I have been doing a study into taxi behavior with its GPS data. I could calculate taxi's mileage by either longitudes and latitudes or times and speeds in the data. Since there are several errors in ...
1
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0answers
9 views

from/to ellipsode to/from cartesian conversion

i am trying to convert from/to ellipsoidal coordinates (lat,lng,alt) to/from cartesian(x,y,z) i wrote the below code to do the conversion, but given the initial values of the gpsLat and gpsLng i ...
0
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0answers
51 views

How can one reprogram a cheap GPS tracker device?

I was wondering if I could get a cheap GPS tracking device such as this one on amazon and reprogram it to send the co-ordinates to my own server? I would then like to generate reports from the DB on ...
1
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1answer
26 views

Creating points with co-ordinates in QGIS to upload to GPS

I have generated a random point within a set area. I have done this using the Google Maps plugin layer. The CRS is set to WGS 84. I want to get the co-ordinates for this point so I went into the ...
0
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1answer
72 views

Exporting Images Linked with Survey data , from a GPS to GIS format

We were setting up a workflow system , where in we attach Survey images to our collected point data ( Leica GPS) . The same can be viewed in Softwares like Leica Geo office, but a GIS export of the ...
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0answers
38 views

Testing a new GPS positioning method

My PhD research involves developing a new positioning algorithm for GPS. The focus on the research is on the mathematical aspects and not to build a GPS receiver. However, we are interested in testing ...
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0answers
12 views

Where ionospheric coefficients come from?

There are 8 coefficients in broadcast GPS message (ION ALPHA and ION BETA in the header of RINEX navigation file) that are the part of the Klobuchar model. Is there an open source of this ...
6
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2answers
184 views

How does a GPS device determine bearing?

Following a discussion on Math and this particular comment, I am wondering how a GPS receiver determines its bearing. As I understand it: GPS is not a directional system, thus bearing can only be ...
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0answers
18 views

SPOT GPS (Find me Spot) Feeds for ArcGIS Online

Does anyone know if it's possible to get a feed from your SPOT GPS account and turn it into a live tracking layer to use in ArcGIS Online? I did find what appears to be a SPOT testing account from ...
0
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1answer
53 views

Add points at specific gps coordinates in qgis [duplicate]

I created a layer in order to draw points with the azimut and distance plugin. IT didnt work at all. There was not even 1 point created. I followed the tutorial here: http://www.teuderun.de/workshops/...
0
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1answer
54 views

How GPS coordinates grows?

I'm working on a project which uses GPS coordinates. I have a UAV that flies, for example, over a meridian or a parallel. I suppose that the coordinates I'm reading from UAV are always increasing or ...
3
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2answers
87 views

How to rename several layers at the same time?

I have got some GPS tracks (MultiLineString). As I import them to QGIS, they look like this: I would like to merge them and to do so, I have to rename all of them like this (picture 2) otherwise an ...
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0answers
10 views

Getting *dop values from a skytraq based gps logger

I am preparing to a project where we are to log several free ranging animals. At the moment I am looking at different gps-logger. One of the more promising is the canmore 740. One issue I have with ...
3
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2answers
191 views

API for land use/land cover

I'm making a mobile game that uses GPS to interact with the real world. The game should be able to "see" what terrain/land use/land cover the user is currently in. Ideally, the game would send the ...
2
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0answers
86 views

how to transfer GPS device coordinates into mobile android app?

i'm trying to make an android app that collects data field in high accuracy, since the phone native GNSS doesn't provide highly accurate coordinates, i want to use Coordinates provided by a real GNSS ...
1
vote
2answers
117 views

Method to determine a person's city/state using location coordinates?

I am working on data-mining project where I have to map a bunch of tweets to US states. I can get the lat/long coordinates from the tweet json, but I am not sure if it is possible to map those ...
2
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0answers
52 views

Can I read ephemeris data from GPS receiver?

I want to filter the GPS data. when I use the low cost GPS receiver, it gives erroneous data. therefore I want to apply some filtering technique. How can I read ephemeris data from GPS receiver? I ...
3
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0answers
95 views

GPS points displaying in the wrong place [closed]

I'm trying to help a student by importing an excel table of Lats and Longs into Arcmap, but they are displaying in the wrong location - I am also a bit suspicious of the coordinates. I imported the ...
0
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0answers
60 views

Python GPS Observation Equations

I've been trying to write some code that will take pseudo-ranges and satellite positions and then compute the observer's position. I've been trying to follow through this book, but the crucial stage ...
1
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0answers
24 views

Plotting GPS plot without uploading data

I'm not sure if this is possible or not, but I'm wondering if its possible to plot a GPS dataset without uploading the data first to CartoDB. I've been analysing some data by uploading the postcode ...
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0answers
23 views

What is the lowest and highest possible pseudo-range?

I am trying to compact the required data that needs to be sent to the server to post-process the receiver's position. To do this, I figured it'd be possible to offset the pseudo-range by a fixed value....
0
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0answers
27 views

GPS similar locations aggregation

I have a set of GPS locations (long and lat) where there are many similar locations, i.e., the difference between any two locations is less than 1 meter, so these two locations are virtually the same. ...
2
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1answer
69 views

Time of the gps fix in GPGGA sentence is always rounded

I am using QSTARZ 818XT device for my app. I am using GPGGA sentences to get the GPS fixes, but I have noticed that timings are always rounded like xxxxxx.000 - for 1Hz GPS frequency and xxxxxx.x00 ...
3
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1answer
128 views

Find gravity normal by ECEF or GPS coordinate of point

How to find gravity normal by ECEF or GPS coordinate of point? Is it the same as normal to elipsoid? Is this ordinary way to calculate normal to ellipse? I'm not quite sure which altitude is ...
2
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3answers
109 views

Why does GPS not give any info before it has a fix?

All GPS devices tell me how much positioning error there is in the fix (e.g. 12 meters). Then why does it not tell me anything before it has a very accurate fix? When a device is looking for its ...
1
vote
1answer
151 views

Average stationary position with GPS

Is it possible to average a stationary position with a GNSS (GPS, GLONASS...) with a centimeter accuracy without external corrections (like differential or RTK)? If so, how long does such averaging ...
2
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1answer
108 views

Setting elevation data for tie points in Pix4D

I am currently working in Pix4D and am trying to assign elevation data to my selected tie points. I have aerial images taken using a camera with GPS from an aircraft and am working with a fairly ...
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0answers
86 views

GPRS data receiving in Java [closed]

i am creating a java program that will receive data from GPS tracker device and will store it in MySQL. for this purpose i need to create a GPRS connection for receiving data. Can anyone help me how ...
0
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0answers
67 views

How to create speed maps with gps data

I am looking to create a speed map from gps data, one of the problems is that the data overlaps due that the road is a track. How can be the best way to plot this map? I have Qgis and ArcGIS options ...
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0answers
54 views

How can I calculate times with gps data using random points on the track? [closed]

I have GPS data from a car that is circulating all the time in a closed circuit. I need to put a few points along the route, about 3 or 4 and calculate the time it takes to get between points. These ...