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7

Chris Brunsdon gave a paper on this issue at the 2008 GeoComputation conference - see http://www.geocomputation.org/2007/1B-Algorithms_and_Architecture1/1B2.pdf In the paper he discusses how to apply Principal Curve Analysis (Hastie and Stuetzle 1989) and makes some suggestions on how to increase robustness of the method. Further searching leads to a ...


5

Well, kinda depends on your programming-language of choice, but i've developed mineturer.org in Java (the site is essentially a site for uploading, analyzing and displaying GPX-data). Iv'e used JAX-B (http://jaxb.java.net/) to read GPX files (based on the GPX schema) and JTS (http://www.vividsolutions.com/jts/) + own code for analyzing. The source code ...


4

ActionCam is a nice visualization tool. You can used this and a desktop video recording tool as a workaround. I also came across MPGHead Video Data Merger but it only works with TrackVision CSV data. Oh, and there's TrackVision ;) And DashWare which gets lots of praise online and can do this. There are also several online sharing services which will let ...


3

Personally I store data collected by my GPS unit as a point layer with a time stamp field, then I can use ST_Makeline if I need the line strings. If you have Postgres 9.0+ you can use an ORDER BY in your aggregate calls to make sure the line goes from point to point in chronological order. I lose the M values along the created lines, but if I need them I ...


3

What I would do is convert the tracklogs to shape files probably preserving the dates as an attribute. (this can be done with free software for gpx2shp). Then use something like qgis (you mentioned free opesource) with data for each of the intersections you want (i.e. country borders, province/county borders, cities [as polygons and points]). Qgis has many ...


3

Almost the same answer as Dano - his post references the one on ArcScripts. It was such a popular download this tool is included in the toolbox at 10.0 Points to Line: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000003s000000.htm And you asked about doing an ignore.... just use a selection set of the points you actually want. The ...


3

DNR Garmin can be used to do this sort of task if your points are in order, simply by importing a point shapefile and resaving as a polyline (track) file. DNR Garmin link EDIT I should add that you can import points (or waypoints) in a variety of formats and export to polylines (tracks) or polygons using this program. It is integrated for ArcMap 9.3 or ...


3

I just did a quick Google search ("join points in ESRI") and got a hit. You'll have to do the read up yourself, but at a glance. It looks to me like it will do the trick. Here ya go: Points to lines As for ignoring points, just make a seperate file and delete the points you want to ignore before you run the script. You'll still have them in the ...


3

Merging your truck routes data looks complex, and it is maybe not necessary. Another approach could be the following: Retrieve some road network data for your area of interest. Maybe you already have it. Otherwise, you could get openstreetmap data on roads. Link or snap your route data to this network using some basic data matching operations. A simple ...


2

NGA GeoNames(1) will get you point names for most of the named placed in the world. ESRI uses that to make their own locator(2) service for ArcMAP. What you want is some code that will basically use the IReverseGeocoding interface to "geocode" your list of lat/lngs and find the closest "named" place to where you were. I think the other stuff (border ...


2

The GPS Toolkit should help. It's an open source library and suite of applications that aims to free researchers from lower level coding. It provides the following functionality: RINEX utilities Positioning Residual analysis Ionospheric modeling Signal Tracking Simulation T Basic transformations Observation data collection and conversion File ...


1

I would suggest to set a tolerance around the position of the the points (roughly 10 m) then your merge the position when the distance is below the tolerance. Similarly, you can run a kernel along your track to find out the average position. The tricky part is to also account for time in order to avoid merging two parallel tracks. another solution is to ...


1

I am no expert in this field, just thinking out aloud. You could try to break your track up into individual points. Filter out points say above 1mph this leaves a bunch of either non moving or very slowly moving points. Then run some point density tool, this should create a grid where points are most dense which would be your meeting places? This assumes ...


1

It depends on what you will want to do with the data once they are loaded in the database. If each data point has associated attributes in addition to time (e.g., engine temperature reading, a photo) or of you will want to use the point data in an analysis, then storing each datum in its own row is a good choice. If each track has associated attributes ...


1

Im working on looking at TMC's of major routes and i have the lats and longs of the starting and ending points, i know how to export txt file into shp file but when i try to do point to line from data management tool im running into an error. Could you guys please help me? and also if the answer is with that python sample coding could you please help me how ...


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http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000003s000000.htm Use Points To Line (Data Management) You can ignore points using the Line Field option, specifically using a value in one field to calculate the line. So, for the points you want, add an arbritary value, and another for ones you don't want, and then sort on that: # ...



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