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Some material used in these slides are taken from 
presentations by 
Roger Bivand and David Rossiter
Reading & Writing Spatial Data 
in R
John Lewis
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Introduction
Having described how spatial data may be 
represented in R:
We need to move on to accessing user data
There are quite a number of packages handling 
and analyzing spatial data in R, and their data 
objects can be converted to or from spatial (sp) 
object form
We need to discuss how coordinate reference 
systems are handled, because they are the 
foundation for spatial data integration
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Generate a Map
library(dismo)
e = extent( -76.9 , -64.9 , 46.0 , 55.0 )
# you can also get an Extent object by 
#clicking on the map twice after using:
# drawExtent()
rmt = gmap(e)#default=Mercator
plot(rmt, interpolate=TRUE)
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The CRS Method
sp uses the CRS (Coordinate Reference System) method of 
package rgdal  to interface with proj4 cartographic projection 
library.
For instance, the R code below shows 3 different CRS 
examples for maps of Quebec: 1) Google map in Lat/Long; 2) 
Google map in default Mercator and 3) Lambert projection for 
medium & small scale
1)proj4string(que_latlon) <- CRS("+proj=longlat 
+datum=WGS84 +ellps=WGS84 +towgs84=0,0,0")
2)proj4string(que_mercator) <- CRS("+proj=merc 
+a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 
+y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs")
3)proj4string(que_lcc) <-CRS("+proj=lcc +lat_1=60 
+lat_2=46 +lat_0=44 +lon_0=-68.5 +x_0=0 +y_0=0 
+ellps=clrk66 +units=m +no_defs")
CRS Method
What you see on the previous slide is the information on the 
projection, datum, ellipsoid & coordinate system. These 
parameters define the spatial nature of the map surface.
Be aware there are many local mapping systems. To obtain 
information on these map parameters please see either -
http://trac.osgeo.org/proj/wiki
http://www.epsg.org/
The latter web site (EPSG) has a spatial reference number system 
which is a short hand code for the data on the previous slide - 
proj4string <CRS("+init=epsg:4979")#world/latlon/GPS
proj4string <- CRS("+init=sr-org:6") 
proj4string <- CRS("+init=epsg:2138")
http://spatialreference.org/ref/?search=mercator
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