Re: [R] distance by sea

2014-06-07 Thread Yvan Richard
Tell me if I'm wrong, but I am guessing that you are trying to calculate the minimum distance between two points, given the presence of barriers between them. For this problem, I have been using cost distances. By giving a raster representing the cost of crossing one cell of the landscape, the min

Re: [R] distance by sea

2014-06-07 Thread jwd
On Thu, 5 Jun 2014 14:58:11 +0200 Giulia Fassio wrote: > Hello, > > someone know if it is possible to use R to calculate distance by sea > between two geographic coordinates? I have many points in the sea and > I want to create a matrix using R of the length of trajectories that > pass only trou

Re: [R] distance by sea

2014-06-05 Thread David L Carlson
&M University College Station, TX 77840-4352 -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Jeff Newmiller Sent: Thursday, June 5, 2014 9:16 AM To: Giulia Fassio; r-help@r-project.org Subject: Re: [R] distance by sea If i

Re: [R] distance by sea

2014-06-05 Thread Jeff Newmiller
If it is possible at all (and I suspect it is) then it should be possible in R. However, your question is lazy... you should not be asking about black boxes that magically solve your problem, but rather do a search for algorithms that accomplish your goals (wouldn't you want to know if someone h

[R] distance by sea

2014-06-05 Thread Giulia Fassio
Hello, someone know if it is possible to use R to calculate distance by sea between two geographic coordinates? I have many points in the sea and I want to create a matrix using R of the length of trajectories that pass only trough sea. Thanks Giulia -- Giulia Fassio Animal Biology PhD student