Hello everybody,
I am a new R & Grass user.
I am interested in doing a kriging of the Temperature in a basin,
based on pixel elevation (DTM).
I use Grass 6.2.1 and R 2.5.1 and have installed the spgrass6 package.
The DTM is called "DTM_trentino_100m" and is like this:
north:5158000.0
south:5058500.0
east:1729700.0
west:1611600.0
rows:995
cols:1181
-9999.0 -9999.0 -9999.0 370.84381103515625 372.55120849609375
373.13128662109375 .....
I have opened R inside the Grass location, and imported the DTM:
> trentino.grid<-readRAST6("DTM_trentino_100m")
Creating BIL support files ...
Header File = /Users/Matteo/Documents/DataGrass/GBovest/
Permafrost/.tmp/nilo.local/DTM_trentino_100m.hdr
World File = /Users/Matteo/Documents/DataGrass/GBovest/
Permafrost/.tmp/nilo.local/DTM_trentino_100m.wld
Exporting Raster as double values(bytes=8)
Using the Current Region settings ...
north=5158000.000000
south=5058500.000000
east=1729700.000000
west=1611600.000000
r=995
c=1181
Percent complete: 100%
r.out.bin complete.
> summary(trentino.grid)
Object of class SpatialGridDataFrame
Coordinates:
min max
coords.x1 1611600 1729700
coords.x2 5058500 5158000
Is projected: TRUE
proj4string :
[+proj=tmerc +lat_0=0.0000000000 +lon_0=9.0000000000 +k_0=0.9996000000
+x_0=1500000.0000000000 +y_0=0.0000000000 +a=6378388 +rf=297 +no_defs
+towgs84=-225.000,-65.000,9.000]
Number of points: 2
Grid attributes:
cellcentre.offset cellsize cells.dim
1 1611650 100 1181
2 5058550 100 995
Data attributes:
DTM_trentino_100m
Min. :1.192e-319
1st Qu.:1.065e-314
Median :1.066e-314
Mean :1.285e-312
3rd Qu.:2.722e-312
Max. :4.774e-312
As you can see, the import has been fully done, yet the attributes
are not correct. In fact, the Min. value is 1.192e-319 and the Max is
4.774e-312 but in reality the elevation changes between 60m to 3500m.
Have I done something wrong? What should I do?
Thank you in advance,
Matteo
---------------------------------
Matteo Dall'Amico
PhD candidate
CUDAM and department of Civil and Environmental Engineering
Universita' degli Studi di Trento
Via Mesiano 77 - 38050 Trento - Italy
email: matteo.dallamico@ing.unitn.it
Tel. +39 0461 882610
Fax +39 0461 882672
http://www.dottorato.it/trento/
---------------------------------
[[alternative HTML version deleted]]
