[postgis-tickets] [PostGIS] #3776: [raster] ST_DumpAsPolygons() stop differenciate values when they are higher than 1048576

[PostGIS]

#3776: [raster] ST_DumpAsPolygons() stop differenciate values when they are higher
than 1048576
----------------------+---------------------------
  Reporter:  pracine  |      Owner:  dustymugs
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 2.3.3
 Component:  raster   |    Version:  2.3.x
Resolution:           |   Keywords:  raster
----------------------+---------------------------
Description changed by pracine:

Old description:

> This works fine:
>
> SELECT (ST_DumpAsPolygons(ST_SetValue(ST_AddBand(ST_MakeEmptyRaster(1, 2,
> 0, 0, 1), '32BUI'::text, 1048575), 1, 1, 1048576))).* rast
>
> returning two polygons, but this fails:
>
> SELECT (ST_DumpAsPolygons(ST_SetValue(ST_AddBand(ST_MakeEmptyRaster(1, 2,
> 0, 0, 1), '32BUI'::text, 1048576), 1, 1, 1048577))).* rast
>
> The only difference is when the pixel values get over 1048576 (which is
> 0x10000 by the way).

New description:

 This works fine:

 SELECT (ST_DumpAsPolygons(ST_SetValue(ST_AddBand(ST_MakeEmptyRaster(1, 2,
 0, 0, 1), '32BUI'::text, 1048575), 1, 1, 1048576))).* rast

 returning two polygons, but this fails:

 SELECT (ST_DumpAsPolygons(ST_SetValue(ST_AddBand(ST_MakeEmptyRaster(1, 2,
 0, 0, 1), '32BUI'::text, 1048576), 1, 1, 1048577))).* rast

 The only difference is when the pixel values get over 1048576 (which is
 0x100000 by the way).

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3776#comment:2>
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