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

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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 ...
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34 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 ...
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19 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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1answer
173 views

Which tools integrate Leica zeno 5 gps handhelds into ArcGIS?

What other software can I use with my Zeno 5 gps handheld device from Leica geosystems except the one they offer that integrates with ArcGIS desktop? They suggested the 'Zeno office' and the 'Zeno ...
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1answer
55 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 ...
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0answers
25 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. ...
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2answers
3k views

Using OpenLayers (with OpenStreetMaps) and PostGis for rendering data acquired from GPS tracking device?

I'm researching and planing to acquire data from GPS device and store them in postGIS database, then use geodjango to process/work them out and finally chart them on a map with OpenLayers. Will these ...
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0answers
25 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 ...
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1answer
11k views

How to batch convert Garmin GDB to GPX?

I need to convert a lot of garmin GDB files to GPX in order to convert it to another vector format. Is there any tools available can do a batch convert from garmin GDB files to GPX? Using MapSource ...
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2answers
75 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 ...
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2answers
222 views

Survey Data to GIS database [closed]

This is a General Question on a possible workflow for Survey Data directly to ArcGIS In most GIS/Survey workflows there is a field collection team and backoffice GIS team. When the availability of ...
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1answer
2k views

How is Precise Point Positioning (PPP) exactly done?

I am looking for a positioning accuracy that is higher than normal consumer-grade GNSS receiver (mostly GPS/GLONASS hybrids with +- 5m precision). I came across RTK with dual receiver setup (base ...
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122 views

How to measure RTK accuracy of a moving vehicle?

I am currently working with tractors using a RTK enhanced automated steering system. One of the biggest problems is that even RTK can have a inaccuracy of 2cm. This can be too much for some possible ...
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0answers
8 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 ...
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0answers
28 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 ...
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1answer
23 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 ...
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1answer
36 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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4answers
1k views

Real time map matching using ArcGIS Desktop?

I am working on a project which requires real time map matching. I am currently using ArcGIS but not sure whether it will work. Here is what happens with my system: the cell phones sent GPS fixes ...
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0answers
30 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
9 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
106 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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6answers
7k views

How to create a polyline-based “heatmap” from GPS tracks?

This winter I am planning to track my downhill skiing/snowboarding using a GPS. Most of my riding will occur at the same resort. I would like to be able to create a sort of "heatmap" that shows the ...
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14answers
6k views

Mobile Data collection options

What COTS software is available to do mobile data collection, with GPS positioning. Map display not required. I'm looking across the board (platform wise). I'm already aware of... RhinoSpect ...
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3answers
663 views

Tracking a vehicle without GPS device

We are planning to write an application which have to track the user driving in his truck in the cities like New York city accurate upto which lane he was driving on. In the cities with those tall ...
3
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2answers
152 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 ...
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0answers
15 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 ...
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1answer
45 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 ...
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0answers
55 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 ...
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0answers
173 views

Windows desktop application that allows to visualize, edit, download, upload and convert GPX files?

I am looking for a simple application that will allow me to visualize GPX data, edit and create new GPX tracks, areas and points and download/upload GPX data to and from devices. This application ...
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1answer
34 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: ...
4
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2answers
159 views

Calculating new satellite position given pseudorange measurements

I'm looking for a reference/text for an explicit formula to calculate a satellite position given pseudorange measurements from later epoch times. I've seen a lot of matlab code on the internet but I ...
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0answers
32 views

Creation of 3d terrain from real data [duplicate]

Possible Duplicate: 3d terrain from data in postgres I am pretty new to spatial database and 3D data. I have a project where i have to create a 3d terrain from data being taken by me by a ...
3
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2answers
71 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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8 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 ...
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3answers
1k views

GPS Elephant Tracking: Utilizing A-GPS, WAAS, DGPS and Understanding HDOP, NSAT, and ZDA

*I'm using a GPS data logger (qstarz bt-q1000xt) to track the movement of zoo elephants, and I have a variety of technical questions. I've had limited success receiving answers from the vendor. You ...
2
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1answer
192 views

How to get all gps points on a road from osm data?

I'm trying to extract gps points on roads in a region. For each road, I need a gps point on that road every 10 meters. I'm aware that Google Map API offer such way points, but due to the ...
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8answers
6k views

Location-based game using GPS

I am not sure if this forum is proper place for that kind of question but i hope to get some advice... I looking for some scenario (examples, ideas) for urban game (location-based game) with usage of ...
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1answer
46 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 ...
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0answers
50 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 ...
2
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0answers
48 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 ...
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1answer
89 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
251 views

How to compare GPS absolute positioning receiver accuracy

I have two different types of GPS modules which are in absolute positioning mode (pseudorange data) Lets say one of them is attached in microcontroller (such as arduino, rasbpy, etc) and the other ...
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6answers
5k views

How correct is the “Accuracy” value given by GPS devices?

I have a Garmin Forerunner 305 and a Google Nexus One Android phone. From the GPS on both these devices I can get a "Accuracy" value that is usually between 6-20 meters. How much can I trust this ...
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1answer
407 views

Accuracy of GPS and HDOP

Given a handheld GPS with an accuracy of roughly 2 meters (verified through field tests) and an observation with an HDOP of 1.2, the accuracy of that one observation should be within 2 meters X 1.2 of ...
4
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1answer
250 views

Calculating Distances between coordinates

I have 75 coordinates in WGS84 that I brought in from an Excel table. They are now on my imagery basemap spanning across about a half mile on either side of a dirt road in Prescott National Forest in ...
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3answers
80 views

What view of sky is required for RTK GPS

When using RTK or differential GPS technologies, considering the Base has a clear unobstructed view, what view of the sky is required to be able to get an accurate fix with the rover when is moving ...
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0answers
43 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 ...
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0answers
19 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
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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 ...
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1answer
27 views

Entering Track from Garmin to GIS not getting basemap and orthomap to line up with Track?

I collected a GPS path on a flight and I would like to condense the path to the place where we landed and took pictures (condensed area at base of map; I want to delete the other part of the line). ...