Global Positioning System (GPS)
1
vote
3answers
83 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 ...
7
votes
2answers
145 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
24 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 ...
0
votes
1answer
116 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 ...
5
votes
1answer
65 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
27 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 ...
3
votes
1answer
173 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. ...
14
votes
10answers
563 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
673 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
64 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
38 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
89 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
43 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 ...
0
votes
0answers
21 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, ...
2
votes
0answers
72 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
46 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 ...
0
votes
1answer
95 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 ...
10
votes
6answers
527 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 ...
17
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
117 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
100 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
80 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
424 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 ...
24
votes
11answers
10k 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
31 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
40 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 , ...
9
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
110 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
75 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
78 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
147 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
48 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
41 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
74 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
597 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 ...
0
votes
0answers
28 views
Is there any plan to integrate support for MOTOTRBO GPS data?
As the Mototrbo digital technology including GPS capabilities is getting more and more popular in the radio industry, is the any plan to integrate the GPS data received from units in the field to the ...
2
votes
1answer
89 views
Is machine learning used much in GIS?
I'm new to GIS. Is machine learning used much in this field, and where?
I'm investigating a job opportunity with a mapping company working on traffic awareness. My background is in supervised machine ...
0
votes
0answers
60 views
Download/Upload GPS/Qgis don't work anymore
We were using Qgis and GpsBabel to download waypoints and tracks from GPS garmin 60 or 76.
Since few weeks, this is not working anymore.
There is a error windows, and nothing is created.
I tried ...
0
votes
1answer
113 views
How can I manipulate the timestamps in a GPX file?
I have a GPS tracked stored in a GPX file. Now I'm looking for a tool that allows me to set the start time of the track and the duration, and the tool should automatically evenly distribute the ...
5
votes
3answers
234 views
Garmin etrex raster maps support
I currently use an excellent set of printed topographic route maps for mountain biking. I would like to scan the maps, georeference them, and upload the maps to a handheld GPS device.
Does the etrex ...
2
votes
0answers
100 views
calculating bounding box from known centre coordinate and zoom
I have a map, the centre of that map (centrepoint) is = -37,175 ( gps)
I know the zoom of the map = 13
I know the size = 320x320px
I know there is 111111m in a degree of latitude and a varying degree ...
1
vote
0answers
36 views
Twitter live feed on ArcGIS desktop [duplicate]
I am a complete beginner with ArcGIS and i have been looking for a way to live feed tweets to ArcGIS desktop. A quick google search brings this blogpost up from 2009: ...
4
votes
2answers
134 views
Storing GPS tracks with timestamps in PostGIS
I need to store a series of GPS points with timestamps in the database (traces of various vehicles).
I am wondering which of two approaches to choose for storing them in the PostGIS table:
1.) Each ...
8
votes
4answers
453 views
How to build a geographic database of GPS logs?
On our aerial wildlife surveys we typically generate dozens of GPX files, and usually convert most of them into shapefiles for display in a GIS application. GPX files are a terrific way of keeping all ...
0
votes
0answers
32 views
Is there any open Source Software to work with *.ssf? [duplicate]
Need an Open Source software to work with *.ssf, as I dont have Trimble Patfinder Office right now..
1
vote
2answers
62 views
QGIS Holux gpx file doesn´t show up
I´ve got a problem with displaying the imported gpx file. The gpx file is created in Holux Funtrek 130 PRo. The map I use is from Openstreetmap, I am sure it is the right map from the location I ...
