[SOLVED]Geodesic distance calculation

If you have problems using RGeostats package or if you simply need some help on an unlisted subject.

[SOLVED]Geodesic distance calculation

Postby Luca » Tue Feb 26, 2013 5:25 pm

Hi all,
I'm struggling to find a way to measure the distances among many polygons in a vector map, the measure need to be taken between the boundaries. I had a look to Rgeos manual and seems that gDistance could solve my problem. My only concern is if gDistance calculate an euclidean distance or a geodetic distance. I mean, is the distance corrected for the projection used? If yes, whatever projection is fine?
Thank you

Luca
Luca
 
Posts: 2
Joined: Tue Feb 26, 2013 5:09 pm

Re: Geodesic distance calculation

Postby Didier Renard » Wed Feb 27, 2013 1:29 am

Hi

I am not sure you considered the correct forum.
The function gDistance is not part of the RGeoS package.
Nevertheless the problem seems interesting and could be coded if better specifications were given.
What is the dimension of the space in which you consider the problem (dimension 2, I suppose).
What are the average number of polygons that you consider? Why are you mentioning a projection
(for my point of view, this distance should be euclidean in the projected space, whatever the projection)...

Cheers
Didier Renard
 
Posts: 251
Joined: Thu Sep 20, 2012 4:22 pm

Re: Geodesic distance calculation

Postby Luca » Wed Feb 27, 2013 9:21 am

Hi Didier,
you are right, I mixed up RGeos with rgeos package from Cran.... I didn't know they were two distinct packages.
Thank you anyway,
Luca
Luca
 
Posts: 2
Joined: Tue Feb 26, 2013 5:09 pm


Return to Other Troubleshooting

Who is online

Users browsing this forum: No registered users and 1 guest

cron