[R-sig-Geo] Distances from points to coast do not make sense.

Agus Camacho agus.camacho at gmail.com
Fri Sep 12 01:13:13 CEST 2014

I have two species, one is widespread in Africa (varanus niloticus) and the
other is distributed across a region of new Guinea (Varanus prasinus). I
calculated the mean distance to coast of their respective geographic
records using the following script:

x1 is a dataframe with two columns: Longitude and Latitude of geographic


for(n in 1:dim(x1)[1])

The problem is that geographic records from the african species is giving
me shorter distances to the coast (mean=6677) than the species from new
guinea(mean=12417). I already plotted the species records and checked there
are not bizarre records. I can send the records for anyone insterested.

Thanks in advance.

Agustín Camacho Guerrero.
Doutor em Zoologia.
Laboratório de Herpetologia, Departamento de Zoologia, Instituto de
Biociências, USP.
Rua do Matão, trav. 14, nº 321, Cidade Universitária,
São Paulo - SP, CEP: 05508-090, Brasil.

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