[GRASS-user] Problems using v.surf.idw

Luí­s Moreira de Sousa luis.de.sousa at protonmail.ch
Sun Apr 18 23:44:43 PDT 2021

Dear Anna,

thank you for the reply, indeed once I added the column parameter the module completed successfully. The manual includes the following on this parameter:

Name of attribute column with values to interpolate
If not given and input is 2D vector map then category values are used. If input is 3D vector
map then z-coordinates are used.

If I read that correctly, the module should pick up the "value" column by defualt. This particular layer was created by GRASS itself and includes a "value" column:

> v.info -c soil_map_rcl_no_water
Displaying column types/names for database connection of layer <1>:

It is now clear this is not the case, `v.surf.idw` is seeking another column by default, one that is not created by vector creating modules. Perhaps this could be made more explicit in the manual page.

Thank you.


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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, April 16, 2021 3:33 PM, Anna Petrášová <kratochanna at gmail.com> wrote:

> Hi Luis,
> could be because you haven't provided the attribute column. It should probably fail with a message in this case...
> Anna
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