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CGIAR SRTM to xyz using GRASS GIS, with sampling

0

I have used CGIAR interface to select the tiles, like so:

This resulted in a bunch of *.zip-files, and I have extracted them all into
a directory.
Next, I followed the instructions as https://grasswiki.osgeo.org/wiki/HOWTO_import_SRTM_elevation_data to turn everything into mosaic,
like so:

 #create mosaik (optionally reproject on the fly with -t_srs)

 gdalwarp *.tif srtm_mosaik.tif

 # import

 r.in.gdal input=srtm_mosaik output=srtm_mosaik location=srtm_mosaic_cgiar

Finally, I "connect" to the location srtm_mosaic_cgiar using grass-gui and export the tiles as xyz elevation data, using r.out.xyz (I use the File->Export... drop-down menu).
Now my question is, since this operation appears to be hard on my laptop,
and I can imagine the elevation data of Europe (as I have selected)
is going to be huge, how to "restrict" r.out.xyz to sample (somehow) the
exported data, or how to ascertain beforehand the size of the output?

My final goal is rather simple. I would like to have a file with x,y,z, where x,y refer to a "locus" somehwere in Europe, all the x,ys are mutually sufficiently apart (say, 300-500km), and z means the "elevation"
of the respective point x,y. If there is a misconception on my part at this
stage already, please feel free to correct me. I am new to GIS.

grass srtm

share

asked 1 min ago

IlonpilaajaIlonpilaaja

1053

add a comment | 

0

I have used CGIAR interface to select the tiles, like so:

This resulted in a bunch of *.zip-files, and I have extracted them all into
a directory.
Next, I followed the instructions as https://grasswiki.osgeo.org/wiki/HOWTO_import_SRTM_elevation_data to turn everything into mosaic,
like so:

 #create mosaik (optionally reproject on the fly with -t_srs)

 gdalwarp *.tif srtm_mosaik.tif

 # import

 r.in.gdal input=srtm_mosaik output=srtm_mosaik location=srtm_mosaic_cgiar

Finally, I "connect" to the location srtm_mosaic_cgiar using grass-gui and export the tiles as xyz elevation data, using r.out.xyz (I use the File->Export... drop-down menu).
Now my question is, since this operation appears to be hard on my laptop,
and I can imagine the elevation data of Europe (as I have selected)
is going to be huge, how to "restrict" r.out.xyz to sample (somehow) the
exported data, or how to ascertain beforehand the size of the output?

My final goal is rather simple. I would like to have a file with x,y,z, where x,y refer to a "locus" somehwere in Europe, all the x,ys are mutually sufficiently apart (say, 300-500km), and z means the "elevation"
of the respective point x,y. If there is a misconception on my part at this
stage already, please feel free to correct me. I am new to GIS.

grass srtm

share

asked 1 min ago

IlonpilaajaIlonpilaaja

1053

add a comment | 

I have used CGIAR interface to select the tiles, like so:

This resulted in a bunch of *.zip-files, and I have extracted them all into
a directory.
Next, I followed the instructions as https://grasswiki.osgeo.org/wiki/HOWTO_import_SRTM_elevation_data to turn everything into mosaic,
like so:

 #create mosaik (optionally reproject on the fly with -t_srs)

 gdalwarp *.tif srtm_mosaik.tif

 # import

 r.in.gdal input=srtm_mosaik output=srtm_mosaik location=srtm_mosaic_cgiar

Finally, I "connect" to the location srtm_mosaic_cgiar using grass-gui and export the tiles as xyz elevation data, using r.out.xyz (I use the File->Export... drop-down menu).
Now my question is, since this operation appears to be hard on my laptop,
and I can imagine the elevation data of Europe (as I have selected)
is going to be huge, how to "restrict" r.out.xyz to sample (somehow) the
exported data, or how to ascertain beforehand the size of the output?

My final goal is rather simple. I would like to have a file with x,y,z, where x,y refer to a "locus" somehwere in Europe, all the x,ys are mutually sufficiently apart (say, 300-500km), and z means the "elevation"
of the respective point x,y. If there is a misconception on my part at this
stage already, please feel free to correct me. I am new to GIS.

grass srtm

share

asked 1 min ago

IlonpilaajaIlonpilaaja

1053

 #create mosaik (optionally reproject on the fly with -t_srs)

 gdalwarp *.tif srtm_mosaik.tif

 # import

 r.in.gdal input=srtm_mosaik output=srtm_mosaik location=srtm_mosaic_cgiar

share

asked 1 min ago

IlonpilaajaIlonpilaaja

1053

share

asked 1 min ago

IlonpilaajaIlonpilaaja

1053

asked 1 min ago

IlonpilaajaIlonpilaaja

1053

asked 1 min ago

IlonpilaajaIlonpilaaja

1053