[R-sig-Geo] path distance maps with R?

[David March Morlà]

Dear all,

I want to create port-based distance maps to analyse spatial 
distribution of fishing effort. I have tried to use ‘distmap.ppp’ 
function from spatstat, but this computes Euclidean distances and I want 
to take into account obstacles (i.e. islands) in the same way as Caddy 
and Carocci (http://www.faocopemed.org/vldocs/0000028/publi04.pdf). Have 
you got any suggestion to perform these path distance maps with R?

Thanks,

-- 
David March Morlà
Doctorando / PhD student
Instituto Mediterraneo de Estudios Avanzados (UIB-CSIC)
C/Miquel Marqués, 21
07190 Esporles
Islas Baleares - Spain
Tel: +34 971 611 722
Fax: +34 971 611 761
Email: david.march at uib.es