[R-sig-Geo] Transform decimal degrees units in km - ReadOGR & owin{spatstat}

[Tom Gottfried]

?spTransform

HTH,
Tom

Am 03.04.2012 20:38, schrieb Aurelie C.Godin:
> Dear list,
>
> I am trying to figure out how I can transform my unit of length from decimal
> degree to square km when I import the following simple ArcGIS polygon shape.
> Ultimately, I would like to have this information available when I assign
> this spatial polygon to my window in spatstat [i.e., Window area = xx square
> unit
> Unit of length: xx km].
>
> div0A<- readOGR(dsn="Archive", layer="Projections")
>> summary(div0A)
> Object of class SpatialPolygonsDataFrame
> Coordinates:
>       min       max
> x -80.00 -57.63430
> y  66.25  78.16666
> Is projected: FALSE
> proj4string :
> [+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0]
> Data attributes:
>         Id      NPAzimutha         UTM20            UTM19           AlberEA
>   Min.   :0   Min.   :348877   Min.   :349232   Min.   :349162   Min.
> :348656
>   1st Qu.:0   1st Qu.:348877   1st Qu.:349232   1st Qu.:349162   1st
> Qu.:348656
>   Median :0   Median :348877   Median :349232   Median :349162   Median
> :348656
>   Mean   :0   Mean   :348877   Mean   :349232   Mean   :349162   Mean
> :348656
>   3rd Qu.:0   3rd Qu.:348877   3rd Qu.:349232   3rd Qu.:349162   3rd
> Qu.:348656
>   Max.   :0   Max.   :348877   Max.   :349232   Max.   :349162   Max.
> :348656
>
> library(spatstat)
> newW2<-as(div0A,"owin")
>> newW2
> window: polygonal boundary
> enclosing rectangle: [-80, -57.6343] x [66.25, 78.16666] units
>
> Thank you very much in advance,
> Aurelie
>
> -----
> Aurelie Cosandey-Godin
> Ph.D. Student, Department of Biology, Dalhousie University
> Industrial Graduate Fellow, WWF-Canada
> Email: godina at dal.ca | Web: wormlab.biology.dal.ca
>
> --
> View this message in context: http://r-sig-geo.2731867.n2.nabble.com/Transform-decimal-degrees-units-in-km-ReadOGR-owin-spatstat-tp7434090p7434090.html
> Sent from the R-sig-geo mailing list archive at Nabble.com.
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo at r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo

-- 
Technische Universität München
Department für Pflanzenwissenschaften
Lehrstuhl für Grünlandlehre
Alte Akademie 12
85350 Freising / Germany
Phone: ++49 (0)8161 715324
Fax:   ++49 (0)8161 713243
email: tom.gottfried at wzw.tum.de
http://www.wzw.tum.de/gruenland