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How to select polygons in a shape layer by polygons of a second shape layer?
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How to select polygons in a shape layer by polygons of a second shape layer? Martin 05-19-2008
Posted by Martin on May 19, 2008, 3:24 pm
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 Hi,

I am trying to make a selection of polygons of one layer that are
"beneath" the (polygon)shapes of a second layer. I mean no
intersection, which cuts off the supernatant parts of the polygons.
The polygons should stay the same, only all polygons that are entirely
or partly covered by the overlying polygon(s) shall be selected (an
then be written in a new shape layer).

I don't have ESRI products, no spatial database nor GRASS, but all the
other nice freeware stuff:
MapWindow, SAGA, Kosmos, gvSIG, GDV Spatial Commander ...

Could anyone point me to a solution?

Martin

Posted by Martin Weis on May 20, 2008, 11:20 am
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 Hello!

Martin wrote:
> I am trying to make a selection of polygons of one layer that are
> "beneath" the (polygon)shapes of a second layer. I mean no
> intersection, which cuts off the supernatant parts of the polygons.
>
> I don't have ESRI products, no spatial database nor GRASS, but all the
> other nice freeware stuff:
> MapWindow, SAGA, Kosmos, gvSIG, GDV Spatial Commander ...

In OpenJUMP this function is in Tools --> Query --> Spatial Query
called
<layer1> intersects <layer2>
or
<layer1> overlaps <layer2>

This might be similarly named in the other GIS.

--
Martin Weis
PGP-Key: http://datenroulette.de/pgp.php

Posted by Martin on May 23, 2008, 3:39 am
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> In OpenJUMP this function is in Tools --> Query --> Spatial Query
> called
> <layer1> intersects <layer2>
> or
> <layer1> overlaps <layer2>
>
> This might be similarly named in the other GIS.
>

Right, thank you a lot.
In Kosmo I now found the corresponding tool: "Layer crosses" with the
options covers, covered by, interesects with, crosses with, touches
with. And (for my purposes) "intersects with" does the job ;-)
I did not come across this tool before, because it is "hidden" in the
"Edit" menu, not in the "tool box" menu...

Regards
Martin


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