[postgis-users] ST_Buffer + grid problem

[Ed Linde]

So far no proper raster, because the following failed, but maybe the
polygon gives us an idea? This polygon is the extent of all the road
geometries in Denmark. Also I remember that when you did the raster at your
end you said it worked. Is 0.000036 degrees = 4m correct if I want to get a
4m by 4m cell sized uniform raster grid?

select ST_AsRaster( ST_GeomFromText('POLYGON((8.07734039737749
54.4984986588244,8.07734039737749 57.7505109647578,15.1919565742587
57.7505109647578,15.1919565742587 54.4984986588244,8.07734039737749
54.4984986588244))'), 0.000036, 0.000036);


On Thu, Mar 22, 2012 at 9:39 PM, Pierre Racine
<Pierre.Racine at sbf.ulaval.ca>wrote:

> > Thanks. The raster I need to visualise is a 4m by 4m grid on the entire
> map of
> > Denmark! :) So do you classify that as a large raster? If so is there a
> way to see a
> > portion of it or something?
> > I just want to manually check for a few areas on the map that the
> intersection
> > indeed works as expected and things haven't gone awry thanks to
> projection
> > differences or that I had degrees instead of meters or some such thing.
> Well, I
> > still have to first test if this GDAL upgrade will fix things and if
> make empty raster
> > .. makes a difference.
>
> That must be big but Danemark is a small country ;-) Only width and height
> tell you if a raster is big.
>
> In the database, your grid is a set of rectangular geometry (how many?) or
> just a big raster now (width & height)?
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