[GRASS-dev] i.segment: invalid region id 0

[Markus Metz]

On Mon, Jul 15, 2013 at 10:04 AM, Moritz Lennert
<mlennert at club.worldonline.be> wrote:
> On Fri, July 12, 2013 21:59, Markus Metz wrote:
>> On Fri, Jul 12, 2013 at 4:36 PM, Moritz Lennert
>> <mlennert at club.worldonline.be> wrote:
>>> Proxmox(Openvz) container running Debian testing, 200GB disk space, 10GB
>>> RAM, 4 i7 CPUs
>>>
>>>> g.region -p
>>> projection: 1 (UTM)
>>> zone:       33
>>> datum:      wgs84
>>> ellipsoid:  wgs84
>>> north:      4876400
>>> south:      4849792
>>> west:       610056
>>> east:       634648
>>> nsres:      0.5
>>> ewres:      0.5
>>> rows:       53216
>>> cols:       49184
>>> cells:      2617375744
>>>
>>>> r.univar 2013_04_24_orthorectified_mosaic_PAN_img02
>>>  100%
>>> total null and non-null cells: 2617375744
>>> total null cells: 2061647833
>>>
>>> Of the non-null cells:
>>> ----------------------
>>> n: 555727911
>>>
>>>> i.group -l pan_r_ir
>>> group <pan_r_ir> references the following raster maps
>>> -------------
>>> <2013_04_24_orthorectified_mosaic_PAN_img02 at PERMANENT>
>>> <2013_04_24_orthorectified_mosaic_XS_img02.5 at PERMANENT>
>>> <2013_04_24_orthorectified_mosaic_XS_img02.7 at PERMANENT>
>>>
>>>
>>>> time i.segment -w group=pan_r_ir out=seg_weighted_pan_r_ir
>>>> threshold=0.01
>>>> memory=8192
>>> Loading input bands...
>>> Pass 1:
>>> ERROR: Invalid region id 0
>>
>> Please try r57074.
>

> I still get exactly the same error. Anything I can do to debug ?

You will need to add loops that go through the segment ids and check
if any id is set to zero.

Another possibility is that the region growing algorithm does not find
a best neighbor for a given region, which it should. There should
always be a valid best neighbor.

I can prepare a patch for you with additional debug tests, hopefully
until this afternoon, then you could have a chance to start the module
again before you go offline.

Markus M

>
> Moritz
>
> P.S. I'll be offline between this afternoon and Thursday morning.
>