[GRASS-user] Using v.in.ascii to create elevation vector

[José María Michia]

2008/11/16 Kurt Springs <ferret_bard en mac.com>:
> Hi folks,
>
> I am trying to convert ascii files that I bought from the Irish Ordinance
> Survey in to GRASS vector format.  These are digital terrain models.  I want
> to eventually make a raster surface map and a 3d raster map out
> demonstrating where various archaeological sites are.
>
> The files the OSI has sent me have a heading set off with "#" on each line,
> then the data.  There are three columns, eventually x, y, z.  These are
> separated by a space.

I think you should remove the character "#" for all lines with data.

You must go from lines like these:

# x y z

To lineas like these:

x y z

You can do this, using the linux command "sed". You must execute
something like these:

$ sed  's/^#\ *//g' datos_orig.xyz > datos.xyz

>
> Using v.in.ascii, I checked Create 3D file
>
> selected the input file, in this case 0834_10.DTM and typed the out put file
> osi0834.  The field separator was set to |.  I erased this, and left it
> blank. Input file format was set to point.
>
> I clicked on the Columns tab.  I left the SQL blank.  Left x=1 y=2  and set
> Z=3.
>
> When I hit run I got:
>
> Scanning input for column types...
>
> Maximum input row length: 33
>
> Maximum number of columns: 1
>
> Minimum number of columns: 1
>
> y column number > minimum last column number
>
> (incorrect field separator?)
>
> I put the | back and got the same error.
>
> I then set the input file format to standard and got:
>
>
> Unexpected data in vector head:
>
> [#]
>
> I have a lot of these to convert.  Can anyone give me any advice?

If I understood, you must delete the "#". See my previous comment in
this message.

José María

> Kurt
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