[postgis-users] Fwd: ST_MakeEmptyRaster: SOLVED

[Mark Wynter]

I set  scaley to -1000, and it forced the raster south.

Begin forwarded message:

> From: Mark Wynter <mark at dimensionaledge.com>
> Date: 23 June 2012 3:51:40 PM AEST
> To: postgis-users at 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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