[GRASS-user] How to grep basic statistics from a vector ascii (x, y, z) file and export in a new ascii?

[Nikos Alexandris]

Thank you all for your replies!

On Sat, 2008-01-05 at 15:12 -0800, David Finlayson wrote:
> Your task sounds like it would be best done by a small script or C
> program. Just read the data in a line-at-a-time and check if the
> current line is larger than the previously stored line. At the end of
> the file, print out the largest line (to a file if you have multiple
> results to store). Probably 5 or 6 lines of Perl/Python at most and
> you would be able to read arbitrarily huge files (millions of rows).
> Most other solutions would introduce complexity or unnecessary
> overhead. For lidar data, you may not have enough RAM to hold the
> whole file in memory and the last thing you want to do is attach
> topology to each point before you manipulate it.
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-- 
Nikos Alexandris
.
Department of Remote Sensing & Landscape Information Systems
Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University Freiburg
.
Tel.  +49 (0) 761 203 3697 / Fax.  +49 (0) 761 203 3701 / Skype: Nikos.Alexandris
.
Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany
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