[R] intersecting polygons and conversion from decimal degree to km

[Renaud Lancelot]

Dear all,

1. How can I compute the intersecting area between 2 polygons ?

2. I have polygons with coordinates in decimal degrees (i.e. 13 deg 30
min = 13.5 decimal degrees). I want to compute their area and get the
results in square meters or square kiometers. Can anyone give me a
conversion coefficient or a pointer where I can find this information
(sorry for this off topic question) ?

Thanks in advance,

Renaud

-- 
Dr Renaud Lancelot, vétérinaire
CIRAD, Département Elevage et Médecine Vétérinaire (CIRAD-Emvt)
Programme Productions Animales
http://www.cirad.fr/presentation/programmes/prod-ani.shtml (Français)
http://www.cirad.fr/presentation/en/program-eng/prod-ani.shtml (English)

ISRA-LNERV                      tel    (221) 832 49 02
BP 2057 Dakar-Hann              fax    (221) 821 18 79 (CIRAD)
Senegal                         e-mail renaud.lancelot at cirad.fr
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