Tiago, if you're not familiar with geographic projections:
1. look at the wikipedia article,
2. check out (from the library) a geography textbook, and
3. try out the examples at the end of the helpfile for spTransform-methods
{rgdal} - add plenty of plot() commands to see what's going on!
Lee De Cola, PhD, MCP.
DATA to Insight
ldec...@comcast.net
Reston, Virginia USA
703 709 6972
571 315 0577 mobile
----- Original Message -----
From: "Tiago Marques" <tiagoandremarq...@gmail.com>
To: r-sig-geo@r-project.org
Sent: Monday, February 17, 2014 8:09:58 AM
Subject: [R-sig-Geo] projecting data from decimal degrees to meters
Dear List,
Sorry if this is a very basic question, I've searched around and could
not find a simple answer to it. I am familiar with R, but not with
geo/GIS stuff. I have a matrix zs containing 3 columns, longitude,
latitude and depth. Depth is available at a regular grid of points
covering approximately 200 by 200 km in the Bahamas. The first few lines
of the data are below:
head(zs)
lat long z
1 23.2383 -78.3133 4.01
2 23.2383 -78.3100 4.00
3 23.2383 -78.3066 4.00
4 23.2383 -78.3033 4.00
5 23.2383 -78.3000 4.00
I would like to implement some animal movement simulations, and my
movement model is parametrized in terms of displacement, in meters. How
can I project zs to a matrix containing say x,y,z in which the x,y are
in meters.
Best, and many thanks in advance for any advice coming this way.
Tiago
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