[gdal-dev] ogr2ogr: create a new shapefile with some math

[canduc17]

Hi everyone. I have a shape file with the following characteristics:
INFO: Open of `faggete.shp'
      using driver `ESRI Shapefile' successful.

Layer name: faggete
Geometry: Polygon
Feature Count: 833
Extent: (341942.975384, 4732949.828158) - (365163.422399, 4773205.622984)
Layer SRS WKT:
(unknown)
FID_fagget: Integer (9.0)
SUP_HA: Real (19.15)
STRINGA: String (11.0)
TF: String (11.0)
CV: String (11.0)
AX: String (11.0)
DE: String (11.0)
INR: String (11.0)
P: String (11.0)
TIPIFORE: String (11.0)
INT: String (11.0)
ATTRIBUTI: String (25.0)
COD_UNIV: String (50.0)
area_ha: Real (19.9)
FID_comuni: Integer (9.0)
NOME_COM: String (50.0)
NumHa: Real (19.11)
VolHa: Real (19.11)
Y_planted: Real (19.11)
Eta: Real (19.11)
Ws: Real (19.11)
Biomassa_e: Real (19.11)
Wr: Real (19.11)
Wf: Real (19.11)


I need to create a new vector file applying mathematical operations to some
field.
For example, let's say I have to double up every value of NumHa and sum this
result to every value of VolHa.
And I have to insert these new values (for NumHa and VolHa) inside the new
vector.
How can I achieve this?
Is that possible with ogr2ogr?

Thanks in advance...

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