GPS is a space-based satellite navigation system that provides location and time information.

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Photos layer in Openlayers

I have some photos. They have GPS information. I want to add they with a layer like markers to Openlayers map. How can i do? Thank You.
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How to find ring of coverage of GPS Satellite on WGS-84 ellipsoid?

Given the following: Time, t The set of IS-200 Ephemeris data, E, of a GPS Satellite corresponding to time t The ECEF position of the GPS satellite, P=(x,y,z), derived from the time and ephemeris, ...
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77 views

QGIS, SpatiaLite and GPS integration

I have QGIS an, access database and a Haicom gps all connected and running on a windows 8 machine. I want to integrate all 3 items so that while in the field i can enter information into the ...
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51 views

Combining two separate shapefiles with undefined projections out of Leica

So this is a mess. When the software outputs I have two shapefiles. The projections aren't defined, but I know one is WGS84 and the other is NAD 83. The NAD 83 includes northing easting and ...
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108 views

Points warped when exporting to shape file (position off in Qgis when imported)

I have just purchased a used Trimble GeoXH and I have done some surveys. I did the differential corrections in Trimble Pathfinder Office 4.10. I have exported the corrected and uncorrected files and ...
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50 views

How to calculate GPS coordinates of one location relative another location? [duplicate]

In location “A” I know longitude (lonA) and latitude (latA) (Altitude is 50m). Relative to location A I know the horizontal (p) and vertical (q) distances to location “B” (B’s Altitude is 0m). I want ...
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98 views

What is a reasonable time to get a gps fix with 10 meters precision?

I hope I'm asking this at the right part of Stack Exchange. Please bear with me if I'm wrong. I'm developing some gps based applications. The demands I have for precision are not very high, but I ...
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2k views

What is a .ssf file?

What exactly is a .ssf file? I am refering to the .ssf files used with Trimble GPS units. I am aware that it is some sort of post processing correction file, but I do not know more than that.
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197 views

how to make decent sense from scattered river depth measurements

I sampled river depth at scattered positions and I want to be able to make a map and GIS layers out of it. My problems are: As the river meanders the interpolation I do in scientific packages i,e. ...
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174 views

Is there any methodology or technology to post process the Mobile/Tablet GPS data

We have developed an application which is running on android OS for collecting the Lat/Long value of any feature and it runs in any type of android Tablet/Mobile but the problem is that the accuracy ...
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69 views

Creating new highway mapping data? Help!

I'm hoping somebody may be able to help or at least point me in the right direction, with a GIS/Mapping query that is a little unusual. I have been tasked at work with looking at how we create a ...
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1answer
21 views

Is it possible to calculate the route when source and destination having same junction using A* algorithm?

I am using A* Algorithm to calculate the shortest path. The route was calculated based on the junction. Shortest route was calculated when there was two or more junction in between source and ...
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4answers
86 views

Accuracies of various GNSS systems

I was looking for a comparitive statement of the accuracies achived by various GNSS systems such as QNSS, COMPASS, GLONASS, GPS..etc. however i find only discriptions of only GPS everywhere
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1answer
250 views

How can I get the GPS info from a PNG?

I am trying to get the GPS data from several hundred PNG photographs for display in Q GIS (so need to access the EXIF data). The online and downloadable viewers I have tried haven't yielded much ...
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1answer
151 views

How does TomTom store trackpoint information on its internal drive?

How does TomTom stores tracks and trackpoints on its internal drive? I maintain an open source computer forensics tool and would like to extract the data from both files and unallocated space. My ...
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1answer
836 views

Build a website to track GPS signals [closed]

I need to build a solution that allows me to track cellphones/tablets and display on a visual map. I think there are two parts, one is understanding the general architecture. The other is more ...
2
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2answers
198 views

Parsing raw data from GPS tracker

As a side project I've been hacking together a simple tracking system for my wayward dog using a cheap GPS / GPRS tracker. I've successfully got it transmitting data to my server over GPRS but while ...
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107 views

SQL procedure(s) to convert GPS traces to an ordered set of junctions in a network

I have three datasets that I have loaded into a geodatabase (spatialite or PostGIS): A set of GPS points collected from individual trips through urban areas. Points have a unique point id, a group ...
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58 views

List of actual GPS position

I have a question - where can I find a list of actual GPS position, for example - ships, airplanes etc. I need it for my project for College - I will create mobile/desktop/web app, which will show ...
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83 views

How to calculate a missing (one or more) lat/long value of a bounding rectangle?

Is it possible to calculate an unknown (one ore more) latitude/longitude value of a bounding rectangle. The log file that I need to process provides a pair of lat/long values for Upper left and Bottom ...
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1answer
365 views

GPS waypoint mapping with android phone

I am a bat enthusiast and volunteer regularly with the local bat groups on bat surveys. In them we record bats with a bat detector - making a note of the different species (there are 18 in the UK), ...
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1answer
1k views

Convert Degree Minutes to decimal degrees [duplicate]

I have location points collected from a garmin device stored in an excel sheet in Degree Minutes format --- W00208.172,N1046.977. I am looking for an Excel formula to convert either to Decimal Degrees ...
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Applying SBAS corrections properly

The SBAS standard, RTCA-MOPS, contains lots of unclear information. I am trying to implement SBAS corrections by the help of EGNOS SDK which is an open source software by ESA. When I apply long ...
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67 views

What is the relationship between Map Service Instances and SDE connections?

We have a GPS project based on ArcGIS Mobile 10.0. There are two web map services and each were kept as Nonpooled with Minimum instances 15 and maximum instances 60 by original developer. The database ...
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1answer
42 views

Download from GPS / changing SCR / still not working

I use a GARMIN GPS; I download my points from the GPS by using GPS tool; I "try to" change projection (SCR) by changing layer property/specify SCR Still, it not working and I cannot view my layer on ...
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284 views

What is correct entry to Input Location (GPFeatureRecordSetLayer)*?

I use: http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Network/ESRI_DriveTime_US/GPServer/CreateDriveTimePolygons/execute What is correct entry to Input Location (GPFeatureRecordSetLayer) ...
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83 views

Add waypoints to ArcMap using GPSBabel

I've been trying to add waypoints to Arcmap for some while now. I have a Mac OS X 10.6.8 and have finally found GPSBabel that is compatible with mac. My current problem is to convert the waypoints ...
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245 views

How to improve accuracy or extrapolate missing or bad GPS points

Is there an easy to use freeware tool to postprocess my location data, in order to correct 1) location errors (or improve accuracy not based on differential GPS correction) and 2) deal with missing ...
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1answer
87 views

Open Source + Offline Geo Notebook

I am looking for an open source offline software to record points of interest that I might visit at a later date. Let's say I am reading a book about Alaska, I'd like to take notes about interesting ...
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297 views

How can I statistically calculate the “real” road from a set of GPS tracks

I participate in a long-distance cycling club, and we started to collect GPS data routinely from our riders. My interest is to calculate "the real trajectory" for future events based on accumulated ...
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1answer
66 views

Need gps trackers for social science research [closed]

I'm interested in studying people's movement over time (24 hours), and would like to do so with devices that also measure elevation very accurately. I understand there's stuff out the where I can buy ...
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48 views

GPS NÜVI 50 -Garmin

I would like to know the accuracy in degrees (not feet) of the latitude and longitude coordinates that the GPS NÜVI 50 gives for a point.
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94 views

How to Deal with Overlapping Coordinates in Statistical Analysis

I decided to make an archaeological map about certain tombs distributed in the area of Crete and make some statistical analyses using the spatial statistical tools of GIS. Specifically, I'll be ...
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133 views

Is it necessary to use a third party service for serving this case?

I have been assigned a task to help build a mobile app, which only shows terrain view of map with a fixed (min/max) zoom level based on mobile phone position and moveable markers which are provided ...
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1answer
282 views

Import GPS data (text documents files) to QGis

I want to import GPS data (text document files) in to Qgis, what file format are you suppose to use ?
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1answer
164 views

QGIS: Colour GPS track by speed

sorry íf I might ask this question the 101 time, but I didn't found anything with google or SE. I have a CSV file with WGS84 trackpoints and visualizing them with QGIS textplugin works fine. The log ...
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124 views

Not able to convert GPS coordinates received from a software into Latitude and Longitude

I am working on a software which returns GPS coordinates in this format: Lat : '48684499' Lon : '5203474' I can not understand what type of coordinates are these and not able to convert them into ...
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268 views

Conversion from NZMG to latitude and longitude

I want to convert NEW ZEALAND MAP GRID coordinates i.e. Northing and Easting into WGS84 coordinates i.e. Latitude and Longitude. I have searched on internet but there is no proper explanation of how ...
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52 views

GPS alarm system for my boat [closed]

I need a GPS alarm system for my boat, in case of theft. Maybe notifying me any anomaly on iPhone. How are they called "GPS Tracking" ? I actually don't need to track my boat while sailing, but just ...
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2answers
295 views

Vehicle tracking by QGIS

I need to do routing for a vehicle. A map with detailed turn-by-turn driving directions should be generated. For example, it should be like car race game in which the map with vehicle tracking is ...
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106 views

Adjusting GPS collected data to a polyline shapefile

I am collecting data from a GPS that is attached to a car. When I display this data in a map, the set of collected points are supposed to match with the street shapefile. However what I see in my map ...
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1answer
68 views

Converting an Experian (Geoconcept) file to GPS coordinates

I'm working with a file containing Experian data which was used in Geoconcept. The file describes a serie of microzones, that is polygons. Unfortuntely the coordinates system is hard to understand: ...
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1answer
218 views

Android GPS: average location resolution time

What is the average location resolution time on a SmartPhone(Android) GPS? Assumptions : The user is under the open sky.
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Issues for 3D length using GPS road tracking for undulated topography

We are tracking road network for undulated topography using Trimple Juno GPS. Is it any problems for 3D length using UTM projection? Thanks to Advance
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2answers
213 views

how to load gps information in my map and track way points?

i am using QGIS 1.8 in ubuntu 12.04 . i am working with ROBOTIC OPERATING SYSTEM(ROS) and QGIS simultaneously . My ROS system is connected to LIDAR(sensors) that will publish gps message so i could ...
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373 views

Calculating Accurate % Grade from GPS Coordinates

I am trying to calculate % Grade from GPS points. I am using the basic equation of (Rise/Run)×100 The problem is I am getting spikes in my GPS data (example 1 meter rise for 3 meter run), I am ...
2
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1answer
137 views

iPhone app to record 3D location information

Does anyone know of an app that would run on an iPhone or iTouch that would record the X,Y and Z information from an external GPS? I am using a Dual XGPS150 Bluetooth receiver. The GPS will record ...
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279 views

GPS tracking and Web mapping?

We are developing a tracking software and we are the stage where we test the reliability of our location stigma on the following web-maps Google Map Nokia HERE Open Street Map (OSM) We observe ...
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what criteria should I consider in buying a pocket GPS

It's my first time making this kind of choices, and I really don't know how to go with a choice or another. I basically know that it should have good durability , a good battery life and good ...
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How to tell if a device supports Assisted GPS, and if how to get the Assisted GPS cooridinates?

1) Is Assisted GPS implemented at the hardware and OS level, or is it a hardware and secondary software thing. I've never used this so wondering what is required to 'access' this. I noticed a wiki ...