Global Positioning System (GPS)
2
votes
1answer
31 views
Transformation from WGS1984 to ITRF2008
We are using Projected Coordinate System: Ain_el_Abd_UTM_Zone_39N (Transverse_Mercator) in our GPS Devices and have valuable Coordinate data.
Can I change the projection of this data this to WGS 1984 ...
1
vote
0answers
25 views
Kalmanfilter GNSS IMU
I want to make an uncoupled Kalman filter. The input data are GPS and the output of my strapdown Algorithm from the IMU. The Strapdown Algorithm is used to calculate the actual position and velocity ...
0
votes
1answer
147 views
convert GPS to x,y using reference node
i am using sensor nodes and their antenna to calculate GPS coordinates as notation of (degrees/minutes/seconds), i have some question of how to do these things:
how can i convert latitude and ...
16
votes
7answers
2k views
Is there a good GPS track analysis library?
I keep writing custom code to work with GPS tracks: GPX files and NMEA logs from my phone, dedicated GPS logger, etc. I feel like I'm reinventing the wheel and am wondering if there's some standard ...
0
votes
0answers
29 views
Any Decent chinese phones with reliable GPS fix? [closed]
this question it may not be directly related to GIS development however as a basic data input to most GIS projects I was wondering whether there is any DECENT Chinese phone, running Android OS vs 4 or ...
1
vote
0answers
19 views
windows function with points in a mixed (multipoint/point) table
I have a table comprising multipoints (tracks) and points (stops between tracks). there can be several consecutive multipoints.
now, i want to merge any points lying very closely to each other ...
1
vote
0answers
22 views
Summing time spent on effort from point GPS data tracks in grid cells
I have one layer of point data representing GPS tracks collected during vessel surveys (an individual survey is indicated as the time between departing and returning to shore and there can be more ...
0
votes
1answer
62 views
Updating position for a list of markers
I am working with Google Maps. Specifically, I am working with http://hpneo.github.io/gmaps for a gps tracker simulation, here I need to update the position on each point.
At the gmaps script, ...
3
votes
1answer
186 views
How to export offsets from Trimble Rangefinder?
I already asked this question at http://www.rpls.com/forums/viewtopic/8/1276880, but didn't get any answer so far. Maybe here someone can help...
I have a question about the use of Trimble Products. ...
3
votes
0answers
28 views
Using PROJ.4 library to transform from local coordinate system coordinates to global coordinate system using ground control points?
I have a point cloud whose coordinates are with respect to a local coordinate system. I also have ground control points with GPS values. Can I convert these local coordinates to a global coordinate ...
1
vote
4answers
95 views
Count consecutive points in a polygon
I have animal relocation data and want to know how many times that animal walked within a polygon for more than one step (i.e there is more than one point within a polygon). I am more interested in ...
0
votes
1answer
119 views
How to calculate surface area of highland region using DEM with ArcGIS (ArcEditor)?
Am shyaka from Rwanda.
I use GIS tools and have all required data to perform or calculate surface area from the polygons that have been given by GPS (Trimble) with ArcPad 8.
I originate from a high ...
0
votes
3answers
213 views
Length of forms in ArcPad10
I'm trying to create a survey with about 250 questions in ArcPad 10. Normally you would expect that a form you created in any application will be able to scroll in PDA if it is too long. But the ...
2
votes
3answers
45 views
Can ArcGIS Desktop or ArcPad use the Windows Location Provider?
Are there any plans for ArcGIS Desktop or ArcMap to get the GPS Coordinates via the 'Windows Location Provider' in Windows 7/8 instead of reading a virtual com port?
0
votes
1answer
23 views
Unable to reference GPS waypoints correctly in ArcGIS
Im working on a project. Waypoints were taken in the field with a Garmin dakota 20.
Ive tried two different ways of putting them into arcgis. One way is through converting the GPX file to a shape file ...
7
votes
2answers
109 views
Recommended driverless GPS loggers?
There are a bunch GPS loggers out there, but a good portion need software to download the data onto a computer. Some of the software is Windows-only, but others are Mac-compatible (what I need). ...
1
vote
0answers
38 views
GPS Coordinates to WKID 102100
I'm currently creating a project for ios and I'm using the latest ArcGIS IOS api. I have a mapView that is using the spatial reference skid 102100 and i am receiving lat long coordinates from an ...
11
votes
7answers
603 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...
ArcPad
ArcGIS ...
7
votes
2answers
163 views
How do I group near points with GPS positions?
I'm an IT person so I don't know too much about projections and so on, I hope you can help me.
I have made an application for Android that collects a GPS position, so I have the latitude and the ...
3
votes
0answers
29 views
Ways to measure similarities/congruence of tracks (point features) in ArcGIS
I have a sets of GPS coordinates recorded while tracking different cross country runners. What I would like to do is to compare how similar the tracks of the individual runners are. Is there a test ...
1
vote
0answers
62 views
Uploading Polygon Shapefile to Garmin GPS. How to View all Polygons?
I am trying to upload a polygon shapefile to a Garmin 60CSx unit. The polygon shapefile is a small area containing polygons of vegetation types. There are are 53 polygons (records) in the shapefile. I ...
14
votes
10answers
587 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 ...
6
votes
2answers
719 views
What algorithm should I use to remove outliers in trace data?
I have GPX traces and want to remove outlying observations. There are some routepoints that are impossible because it would require acceleration that the vehicle can not achieve. Are there good ...
0
votes
1answer
84 views
ArcGIS mobile to use external GPS device
Im currently tasked to create an app that would sketch a GPS Device's movement and plot it on the ArcGIS map. By default, the ArcGIS locationDisplay class calls the IOS class CLLocation to retrieve ...
3
votes
0answers
74 views
GPS data based track/trip calculation algorithm available?
Currently I'm receiving position data of moving assets every 90 or 120 seconds (depending on the asset). What I'd like to achieve now is to detect standstill and movement phases (tracks/trips) on the ...
5
votes
4answers
107 views
Is there a way to identify and remove similar GPS tracks in PostGIS or ArcGIS?
I have a large number of GPS tracks from a number of different users. I'd like to identify tracks that take the same route and remove those duplicates. For example, a user takes the same streets from ...
2
votes
2answers
66 views
Webservices for GPS (Upload on DB and display it)
i'm doing an application where my users would be able to upload their gps tracks. My idea is to put their tracks on mysql database and display it on appropriate map.
Question:How can i do that? My ...
2
votes
0answers
97 views
How to interpolate GPS data correctly?
I'm working on a project that involves using linear interpolation to fit lines to
lat/lng points. I'm pretty new at scientific programming related stuff, and I was wondering if people could steer me ...
1
vote
1answer
67 views
Why do points shift when reprojected from WGS84 to a state plane coordinate?
We have a Trimble unit we use to collect equipment.
We collect the data in WGS84 and differentially correct it and then reproject it to a state plan coordinate system.
The points always shift the ...
18
votes
6answers
1k views
Is GPS more accurate on specific hours of the day?
I have heard that the GPS system is more accurate, and less accurate on some specific hours on the day.
If this is true, how can I get the information on when GPS is more or less accurate at my ...
12
votes
2answers
4k views
What is the difference between triangulation and trilateration?
Looking around I noticed that many people exchange the terms (tringlulation and trilateration) for the same sense.
What's, actually, the correct sense of Triangulation and what are the differences ...
1
vote
0answers
250 views
convert GPS to XY coordinates
if i have obtain GPS coordinates as Latitude/Longitude, then i need to convert them to XY coordinates, i see this link
actually i need to get the Trilateration , in its equation i need the XY ...
0
votes
0answers
27 views
A machine to measure latitude to 6 decimal places of a degree [duplicate]
I am doing a PhD research project to do with medieval and ancient archaeoastronomy which requires me to be able to measure latitudes up to an accuracy of 6 decimal places of a degree of latitude. ...
2
votes
1answer
110 views
Why are Garmin provided maps inaccurate?
Collected tracks on my Garmin GPS (Oregon 450) or in BaseCamp seem to be not in the correct position. There's only a little detail with major highways but it looks as though the route is shifted ...
5
votes
3answers
124 views
How to transform GPX-tracks into elevation-tracks with any GIS?
I have a GPS track in GPX format available from a recent bike tour and I need and want to do some analysis on the tracks. I'm wondering whether there is any way to transform the GPX data into an ...
3
votes
3answers
458 views
GPS drift during the receiver is stationed
I have developed a GPS Tracking device it is working fine when the receiver is in motion, when it stationed in a position for couple of hours i get some drift for around 10-15meters. The receiver send ...
25
votes
11answers
11k views
Tablet or smart phone GPS vs “real” GPS
I've been reading a lot today about android and iphone devices being used for spatial data collection in the field and it sure seems to be that single purpose devices such as the extremely popular ...
0
votes
0answers
42 views
QGIS GPS live tracking adding polygon vertices
Maybe I'm missing something or maybe it is a bug? I'm trying to add polygons using the GPS information console. The only button available to record data is "add polygon", but if you click on it, you ...
0
votes
1answer
42 views
error in estimate distance?
i do some experiment place two sensor node between them 4 meter as distance.
then i get these GPS information:
node1: Latitude: 32, 33.255 , Longitude: 36, 0.6632
node2: Latitude: 32, 33.228 , ...
10
votes
5answers
5k views
Convert XY points to a line?
Someone mistakenly saved a GPS track as waypoints and then sent them along to me in a .csv file. They want a line back (shapefile). What's the simplest method to convert this to a line? Available ...
1
vote
1answer
113 views
Finding intermediate points and speed over a segment
I have a dataset which is in the form of ( Time , Car ID, Speed at that moment, Lat,Long) and I need to do some machine learning on the data to answer the following questions :
Best route from ...
1
vote
1answer
89 views
find euclidean distance in GPS [duplicate]
i need to find the distance between two gps location, So i think to do this:
lat1(seconds)-lat2(seconds)=lat * 30.7151 == distance latitude in meters =Latm
long1(seconds)-long2(seconds)=long ...
10
votes
3answers
3k views
Post Processing GPS Data with open source software
I am using Magellan Professional Mapper CX working on ArcPad 7.1 platform. It has sub-meter accuracy after post processing. Without post processing the data collected in the field is off by 10 to 15 ...
0
votes
2answers
93 views
I can not download gpx from GPS through GPS tool with GPS babel on QGIS
I have already install GPS tool plug-in and GPS Babel.
Garmin GPS map 62s is connected my PC through USB cable.
I changed device setting according to below site.
...
5
votes
1answer
154 views
Simulate (Mock) GPS Tracks
I have the following scenario:
1) I need to create GPX files for use in testing of a mobile device.
2) The tracks to be described within will span large distances over long time periods (i.e. it's ...
1
vote
1answer
64 views
Force ArcGIS iOS to use GPS data from External GPS device
I created an app that will display the map and the location of the external GPS device. The scenario is using a wifly module to broadcast the GPS data of the GPS receiver in wifi. The app is now ...
0
votes
1answer
47 views
Imported GPS data does not overlap with map
I´m working on QGIS and I geocoded 2 addresses of a city in Germany and tried to input the text-file as a layer. It worked, but the 2 points must be in the map of the city and if I zoom to the ...
3
votes
3answers
85 views
How long for surveying quality GPS to get accurate 3D position information
I recently read an Ordnance Survey Blog article that seemed to suggest that it was necessary to leave the GPS device in use for four hours to gather requisite data. I am aware that "domestic" GPS ...
0
votes
0answers
24 views
Best handheld GPS unit under $500? [duplicate]
I hope this is okay to post here.
I want to do some data collection in my free time which will be hosted on my own website for people to freely download and use.
I obviously want the data to be as ...
11
votes
4answers
606 views
GPS to map workflow, for non-GIS folk
What applications and workflow(s) do you use for gathering, displaying and storing GPS data, with your centralised corporate data, for people who are not GIS folk?
We're in the process of ...
