[Talk-us] MassGIS Building Import - simplify

[Jason Remillard]

Hi,

The ST_SimplifyPreserveTopology worked great! I will upload new data
tomorrow.

Thanks
Jason.

On Thu, Dec 13, 2012 at 9:18 PM, andrzej zaborowski <balrogg at gmail.com>wrote:

> Hi,
>
> On 14 December 2012 02:12, Jason Remillard <remillard.jason at gmail.com>
> wrote:
> > In my town, there are 5427 buildings. 43,628 nodes, or 8 nodes per
> > structure. I did a 0.25 meter simplify on the entire town, and the node
> > count went down to 41,809. We are looking at an excess of 5%. 0.25 meter
> may
> > seem tight, but consider that source data was from 30cm and 15cm per
> pixel,
> > and I am sure the algorithms used do some kind of sub pixel
> interpolation.
> > Until I can figure out how to do the simplification from my scripts,
> > ..
>
> As I understand some processing is done in PostGIS already.  You could
> add a ST_SimplifyPreserveTopology(the_geom, 0.25) at the end of the
> process and it should have the same effect.
>
> Cheers
>
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