I set scaley to -1000, and it forced the raster south.
Begin forwarded message:
> From: Mark Wynter <m...@dimensionaledge.com>
> Date: 23 June 2012 3:51:40 PM AEST
> To: postgis-users@postgis.refractions.net
> Subject: ST_MakeEmptyRaster
>
> When making an empty raster, is there a way to control the direction of the
> raster?
>
> The starting point for the raster is upperleftx, upperlefty. So If I'm in
> the southern hemisphere, the upperlefty value is a negative number, hence the
> grid builds in a northerly direction
>
> INSERT INTO dummy_rast(rid,rast)
> VALUES(1, ST_MakeEmptyRaster(100, 100, 570344, -3781663, 1000, 1000, 0, 0,
> 3577));
>
> If I change the width to -100 in the hope of reversing the direction, no
> luck...
>
> INSERT INTO dummy_rast(rid,rast)
> VALUES(1, ST_MakeEmptyRaster(100, -100, 570344, -3781663, 1000, 1000, 0, 0,
> 3577));
>
> The blocksize_y doesn't accept negative numbers, and defaults according...
>
> srid | scale_x | scale_y | blocksize_x | blocksize_y | num_bands |
> pixel_types | nodata_values
> ------+---------+---------+-------------+-------------+-----------+-------------+---------------
> 3577 | 1000 | 1000 | 100 | 65436 | 1 | {8BUI}
> | {NULL}
> (1 row)
>
> I understand the logic of why it's doing what it is.
>
> Is there a way of making the grid build in a southerly direction if I'm in
> the southern hemisphere?
>
>
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