Ludovico Bianchini wrote:
Hi,
these are not strictly linked with postgis, but regard shape file,
maybe here I can find help.
1) Is there a tool to build an union of shape files? Not an index
file, but a new shape file containing all the features of the shapes
used as sources.
2) Is there a tool to extract features from a shape file using an
attribute of .dbf table as filter? and saving these extracted features
in a new shape file?
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I guess ogr2ogr should fulfil your requirements. It's a powerful command
line interface to the OGR library.
In order to merge 2 shapefiles a.shp and b.shp you could do something like:
ogr2ogr -f "ESRI Shapefile" new.shp a.shp
ogr2ogr -f "ESRI Shapefile" -append new.shp b.shp
(The above assumes your shapefiles format are equivalent, see below if
it's not the case)
You can also do some complex transformation using a SQL-like syntax with
the '-where' and '-select'. For example, if your input dataset has 2
fields 'columnA' and 'columnB' and you want only 'columnB' in output,
you could do:
ogr2ogr -f "ESRI Shapefile" -select "columnB" new.shp input.shp
Just issue a 'man ogr2ogr' command to check syntax and available option
(also available online: http://www.gdal.org/ogr/ogr2ogr.html)
Cheers,
--
Gilles Bassiere
MAKINA CORPUS
30 rue des Jeuneurs
FR-75011 PARIS
http://www.makina-corpus.com
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