[postgis-users] PostGIS 1.3.3 on Windows XP Unstable

[Obe, Regina]

Thanks Mike,
 
  Yap that looks more like a union and was pretty fast, but then
couldn't figure out how to export it.
I right clicked on the layer - selected export data to shape.
 
Very strangely when I reopen the new shape file in ArcMap - it looks
unioned, but then when I open the same shape file in OpenJump - I can
still see the boundaries still and opening up the dbf there are clearly
274 records.  I even deleted the mxd, sbn, sbx files ArcMap created and
it still looked unioned when I reopened it in ArcMap and not unioned
when I look at it in open jump.
 
The union created in open jump is half the size of the ArcMap one too
and dbf is empty as I would expect since I didn't ask for any roll up of
attributes.
 
I'm very puzzled.  I have no idea why ArcMap shows this as unioned when
the size of the shape and the stats don't look that much different from
the original.  I'm sure I must be missing something here.
 
Stats looks like this is in open jump
 

Layer: OpenJumpUnion 

Envelope: Env[-179.14734 : 179.77850341796875, 17.884813 :
71.35256064399981]
# Features: 1

  	Min 	Max 	Avg 	Total 	
Pts 	69795 	69795 	69795.0 	69795 	
Holes 	0 	0 	0.0 	0 	
Components 	219 	219 	219.0 	219 	
Area 	1104.3917345465716 	1104.3917345465716
1104.3917345465716 	1104.3917345465716 	
Length 	733.4595414659133 	733.4595414659133
733.4595414659133 	733.4595414659133 	
 
ArcMap Union
Envelope: Env[-179.14734 : 179.77850341796875, 17.884813 :
71.35256064399981]
# Features: 274 
	Min 	Max 	Avg 	Total 	
Pts 	5 	45836 	688.0 	188644 	
Holes 	0 	0 	0.0 	0 	
Components 	1 	219 	1.0 	492 	
Area 	1.0783706500011592E-5 	1104.373302353546
8.061118897843844 	2208.7465780092134 	
Length 	0.013284095041776186 	733.3902842391406
8.213194606088345 	2250.4153220682065 	
 
 
Original

Layer: st99_d00 

Envelope: Env[-179.14734 : 179.77850341796875, 17.884813 :
71.35256064399981]
# Features: 274

  	Min 	Max 	Avg 	Total 	
Pts 	5 	45836 	688.0 	188644 	
Holes 	0 	0 	0.0 	0 	
Components 	1 	219 	1.0 	492 	
Area 	1.0783706500011592E-5 	1104.373302353546
8.061118897843844 	2208.7465780092134 	
Length 	0.013284095041776186 	733.3902842391406
8.213194606088345 	2250.4153220682065 	

Signed,
Very confused Regina
________________________________

From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
Bresnahan, Mike
Sent: Monday, August 18, 2008 10:12 AM
To: PostGIS Users Discussion
Subject: RE: [postgis-users] PostGIS 1.3.3 on Windows XP Unstable


> How the hell do you get it to do a real union?

Heh. Intuitive ArcMap is not. It took me forever to figure it out as
well. You can do a union a couple different ways. The way that seemed to
work the best for this is to:
 
1) Run ArcMap
2) Add the shapefile to your map
3) Open the edit toolbar.
4) Click on Start Editing.
5) Select the entire dataset by left clicking and then dragging a
rectangle around the geometry.
6) Select Union from the menu on the edit toolbar.
 
You should see the union happen right before your eyes.
 
I think I tried the Union Tool like you did and didn't get what I
expected. I think it just did a union on each individual feature instead
of doing an aggregate union.
 


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