[postgis-devel] [wktraster] Core tests failure for r5841

[Jorge Arévalo]

On Wed, Jan 12, 2011 at 7:47 PM, Pierre Racine
<Pierre.Racine at sbf.ulaval.ca> wrote:
> Jorge, Regina,
>
> I get a fresh build of PostGIS raster and the regress test in rt_addband.sql fail on my machine. It was modified by Mateusz which was obtaining different results.
>
> In the first case:
>
> SELECT St_Value(ST_AddBand(ST_MakeEmptyRaster(1000, 1000, 10, 10, 2, 2, 0, 0, -1), 1, '16BSI', -32769, NULL), 3, 3);
>
> Mateusz gets 32767 and I get -32768
>
> In the second case:
>
> SELECT St_Value(ST_AddBand(ST_MakeEmptyRaster(1000, 1000, 10, 10, 2, 2, 0, 0, -1), 1, '16BSI', 210000.46, NULL), 3, 3);
>
> Mateusz gets 13392 and I get -32768
>
> I suspect this is a Windows/Linux difference. Do the test works/fails for you? What results do you get?
>
> Pierre
>

Hi,

In my Linux (Ubuntu 9.10) box:

>From SELECT St_Value(ST_AddBand(ST_MakeEmptyRaster(1000, 1000, 10, 10,
2, 2, 0, 0, -1), 1, '16BSI', -32769, NULL), 3, 3);

I'm getting -32768

And from SELECT St_Value(ST_AddBand(ST_MakeEmptyRaster(1000, 1000, 10,
10, 2, 2, 0, 0, -1), 1, '16BSI', 210000.46, NULL), 3, 3);

I'm getting -32768 too

Using last version from trunk (r6604).

Best regards,

-- 
Jorge Arévalo
Internet & Mobilty Division, DEIMOS
jorge.arevalo at deimos-space.com
http://mobility.grupodeimos.com/
http://gis4free.wordpress.com
http://geohash.org/ezjqgrgzz0g


>>-----Original Message-----
>>From: Mateusz Loskot [mailto:mateusz at loskot.net]
>>Sent: 4 septembre 2010 14:28
>>To: PostGIS Development Discussion
>>Cc: Pierre Racine
>>Subject: Re: [postgis-devel] [wktraster] Core tests failure for r5841
>>
>>On 31/08/10 21:14, Pierre Racine wrote:
>>>>From thoses two lines in the rt_addband.sql file:
>>>
>>> SELECT St_Value(ST_AddBand(ST_MakeEmptyRaster(1000, 1000, 10, 10, 2, 2, 0, 0, -1), 1, '16BSI', -
>>32769, NULL), 3, 3);
>>>
>>> and further:
>>>
>>> SELECT St_Value(ST_AddBand(ST_MakeEmptyRaster(1000, 1000, 10, 10, 2, 2, 0, 0, -1), 1, '16BSI',
>>210000.46, NULL), 3, 3);
>>
>>
>>Pierre,
>>
>>I'm still confused why you are getting such strange values.
>>The value -32768 is invalid and unexpected, obviously.
>>It would indicate a bug.
>>
>>Fortunately, I do not get such value, but I get the correct ones:
>>
>>r1=# SELECT St_Value(ST_AddBand(ST_MakeEmptyRaster(1000, 1000, 10, 10,
>>2, 2, 0, 0, -1), 1, '16BSI', -32769, NULL), 3, 3);
>>WARNING:  Initial pixel value for 16BSI band got truncated from
>>-32769.000000 to 32767
>> st_value
>>----------
>>    32767
>>(1 row)
>>
>>r1=# SELECT St_Value(ST_AddBand(ST_MakeEmptyRaster(1000, 1000, 10, 10,
>>2, 2, 0, 0, -1), 1, '16BSI', 210000.46, NULL), 3, 3);
>>WARNING:  Initial pixel value for 16BSI band got truncated from
>>210000.460000 to 13392
>> st_value
>>----------
>>    13392
>>(1 row)
>>
>>
>>
>>Nevertheless, I've updated the expected output with correct values:
>>
>>http://trac.osgeo.org/postgis/changeset/5907
>>
>>Best regards,
>>--
>>Mateusz Loskot, http://mateusz.loskot.net
>>Charter Member of OSGeo, http://osgeo.org
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