srtm: SRTM Package
In SteffenKriewald/srtmtools: SRTM tools

Description Usage Arguments Details Value Author(s) References Examples

Tool for handling srtm-data including cca [1]

srtm.download(url=3, all=TRUE, dest=getwd(),n,s,e,w)
srtm.list()
srtm.region(e,w,s,n,path=getwd(),del.tmp=TRUE,plot=FALSE,out="output",type="")
srtm.slr(srtm,slr,pos=FALSE,type="",out="output",cca.s=2,mode=3,plot=FALSE)

`all`	If TRUE all Files which are available, will be downloaded. If FALSE you can specify a single region using n,s,e,w.
`cca.s`	The radius/shell size of the burning procedure in the cca (i.e. how tolerant to small gaps the algorithm is)
`del.tmp`	If TRUE the created temporary Folder, which contains the unzipped srtm files will be deleted.
`dest`	Defining a download folder.
`e`	east coordinate in decimal degree (e=12.2)
`mode`	The algorithm comes in three versions which affect which close cells are included to the considered cluster: (mode=1) nearest neighbors (mode=2) cells within a shell (i.e. squares of certain size) (mode=3) cells within a radius Whereas (mode=1) is equivalent to (mode=3) with r=1 and (mode=2) with r=1 is equivalent to (mode=3) with r=2.
`n`	north coordinate in decimal degree (n=54.2)
`out`	Defining the name of the output file. Only active if you have chosen a type.
`path`	Defining the path to the folder with downloaded srtm zip-files.
`plot`	If TRUE a plot of the extracted srtm will be generated.
`pos`	A vector containing the starting position for the clustering. Will automatically reseted, if the starting point is not defined as ocean.
`s`	south coordinate in decimal degree (s=53.2)
`slr`	Defining a Sea-level in meter for flooding.
`srtm`	A R raster object. All internal operations will be done on such a raster, excluding the cca (ordinary matrix).
`type`	Defining the type of the output file. You can choose between "shp" and "tif". If type="", as per default, no output file will be generated.
`url`	Defining alternative download server as String. Per default you can choose between: (url=1) "ftp://srtm.csi.cgiar.org/SRTM_V41/SRTM_Data_GeoTiff/" (url=2) "http://srtm.csi.cgiar.org/SRT-ZIP/SRTM_V41/SRTM_Data_GeoTiff/" (url=3) "http://droppr.org/srtm/v4.1/6_5x5_TIFs/" (url=4) "ftp://xftp.jrc.it/pub/srtmV4/tiff/"
`w`	west coordinate in decimal degree (w=13.2)

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Steffen Kriewald

[1] Rozenfeld HD, et al. (2008) Laws of population growth. Proc Nat Acad Sci USA 105:18702-18707.

n<-32.9
s<-32.6
w<--17.3
e<--16.6

srtm.download(all=FALSE,n=n,s=s,w=w,e=e)
madeira <- srtm.region(n=n,s=s,w=w,e=e,plot=TRUE)
slr <- srtm.slr(madeira,slr=100,cca.s=1,mode=2,plot=TRUE)