Hi Szilard,
This is for the last bit of your question, not sure if I understand the
earlier part of what you were asking.
I've been using a loop written in R (spgrass6) for pulling in multiple
files, I'm sure you can write an equivalent loop in pygrass. Example for
vector import below, you should be able to do something similar for
LiDAR files. Hope this helps.
Cheers,
Ravi
## Start R from within the GRASS console (I simply launch rstudio so I
have a nice environment to work in)
## Load the required libraries
library(spgrass6)
## Specify the directory where your data sits
datadir<-"/xyz/xyz/xyz/Data/"
## List out the maps you want
vectlist<-c("map1", "map2", "map3",.....)
## Note that GRASS automatically assigns the input file name to the output.
## Also note that the overwrite flag, you are creating a new grass dataset
## For rasters you'll want to set the region and resolution using
g.region first.
i<-1
while(i<=length(vectlist)){
execGRASS("v.in.ogr",
flags=c("o", "e", "overwrite"),
parameters=list(
dsn=datadir,
layer=vectlist[i])
)
i <- i+1;
}
On 04/29/2013 07:00 AM, Szilard Albert wrote:
Hello,
It is my very first attempt to use Grass. Or any other Gis program for
that matter.
I am trying to read in multiple (hundreds, thousand) LiDAR ascii files
into Grass. They contain elevation data.
I think I have managed one, and I can make a map of elevations, using
File, Import Raster Map, Multiple formats using GDAL. The format is as
follows:
ncols 1000
nrows 1000
xllcorner 562000.000
yllcorner 7124000.000
cellsize 1
nodata_value -9999.0
108.93 108.92 108.97 108.99 109 109.01...
...
...
1000 lines, 1000 columns, representing 1 sq km with values at every 1
m. Files are called
572000-7144000_dem_1m.asc
572000-7145000_dem_1m.asc
572000-7146000_dem_1m.asc
etc.
Can this data be loaded as is, or it needs to be converted to a format
where
X Y Z are columns 1, 2, 3 etc..
My question is, how do Y read in multiple files? I have tried
concatenating them, no luck.
Thank you for your help..
regards,
Szilard
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R.S. Bhalla, Ph.D.
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