[Qgis-user] morphing two polygons

[Peter Bange]

If your data are in a Postgres/PostGIS database I would suggest you
could create a (smart) view that interpolates from Polygon A to polygon
B. Mayby you need to make a (little) function for this.

Peter Bange

-----Original Message-----
From: qgis-user-bounces at lists.osgeo.org
[mailto:qgis-user-bounces at lists.osgeo.org] On Behalf Of cfarmer
Sent: woensdag, juni 11, 2008 7:47 AM
To: Ken Sanderson
Cc: qgis-user
Subject: Re: [Qgis-user] morphing two polygons

Ken,

I have been thinking about a similar problem myself in terms of spread.
This ends up being pretty much the opposite to your problem I guess...

What is is that you would like to do with the intermediate polygons? Is
it
just for visualization, or would you need actual polygon files to work
with?

I would be interested to hear more about what you are doing: feel free
to
email me directly about this... I may have a solution in the works for
you
;)

Carson


> Hi all,
>
> I have been mucking around with some thoughts on how I might morph
from
> an original polygon to a larger polygon, showing the intermediate
steps
> in between and thought I would see if anyone has done this in QGIS or
> had any suggestions.
>
> So I have polygon A that shows a large blob, polygon B that shows that
> same blob much reduced in size. Assuming an even reduction in size, I
> want to create a polygon of that lake at different intervals of change
> between A and B. Hope that makes sense.
>
> My original thinking was to pretend the two polygons are contour lines
> and interpolate between them, then convert the interpolated countours
to
> their own polygons. Any other thoughts on this?
>
> Thanks,
>
> Ken
>
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Carson Farmer
Spatial Pattern Analysis & Research Lab (SPAR)
Department of Geography, University of Victoria
PO Box 3050 STN CSC
Victoria, BC, V8W 3P5,Canada
www.geog.uvic.ca/spar
cfarmer at uvic.ca


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