[Gvsig_english] POTENTIAL ERROR/BUG gvSIG 1.9 (BN 1253) -- Spatial Selection

[Simon Cropper (Botanicus Australia Pty Ltd)]

Hi,

If I (i) create a polygon layer with 1-2 polygons and select 1, (ii) 
then create a point layer (where some points overlap with a polygon) and 
select all the points, and (iii) open the spatial selection tool.

1. If I select 'Intersect with.. + New Selection' all the points that 
intersect with my selected polygon remain selected. :-)
2. "Add to Selection' appears to be a redundant button because this tool 
only works with geometries selected in both layers (which is very 
frustrating). How do you select currently unselected geometries that 
overlap with selected geometries in another layer or just another layer? 
=-O
3. If I select 'Intersect with.. + Subtract from Selection' all the 
points that intersect with my selected polygon remain selected 
everything else is unselected. =-O
4. If I select 'are disjoint from.. + New Selection' this selects 
everything else.

I was using this tool extensively today to apply multiple conditions 
(polygon with certain vegetation types + polygons not with already 
modified attributes + polygons with certain trees present + polygons 
over certain geology). I tried over and over to apply a sequence of 
filters and spatial selections but found I could not get the subset I 
wanted. In the end I needed to create new fields  and put a '1' in them 
if they matched a spatial selection or filter. Then use a simple filter 
to get all the polygons with 1+1+1+1. Clumsy but it worked.

Apart from the mentioned error why does this tool only work on selected 
items - as mentioned you can't bring in unselected items. :-(
-- 

Cheers Simon

Simon Cropper
Botanicus Australia Pty Ltd
PO Box 160, Sunshine, Victoria 3020.
P: 9311 5822. M: 041 830 3437.
mailto: scropper at botanicusaustralia.com.au 
<mailto:scropper at botanicusaustralia.com.au>
web: www.botanicusaustralia.com.au <http://www.botanicusaustralia.com.au>