[GRASS-dev] r.in.gdal changes range of values for sentinel bands (?)

[Veronica Andreo]

I tested also with 74 release branch... same result

2018-02-05 13:05 GMT+01:00 Veronica Andreo <veroandreo at gmail.com>:

> Hi devs
>
> I'm testing Martin's new add-on, r.sentinel.import. I created an UTM21S
> location for my data and imported them with:
>
> r.sentinel.import input=Downloads/S2B_MSIL1C_20171212T134159_N0206_R124_
> T21KZP_20171212T201017.SAFE/GRANULE/L1C_T21KZP_A004011_
> 20171212T134158/IMG_DATA/
>
> The problem arose when I tried to use i.color.enhance to display an RGB: I
> got blank screens, so I thought there must be something with the range of
> values.
>
> r.univar map=T21KZP_20171212T134159_B02 at PERMANENT
>
> total null and non-null cells: 120560400
> total null cells: 0
> Of the non-null cells:
> ----------------------
> n: 120560400
> minimum: 15
> maximum: 17547
> range: 17532
> mean: 913.778
> mean of absolute values: 913.778
> standard deviation: 134.322
> variance: 18042.4
> variation coefficient: 14.6996 %
> sum: 110165471238
>
> that already seemed odd...
> I checked the original band2 jp2 file... Values are different...
>
> gdalinfo T21KZP_20171212T134159_B02.jp2
> Driver: JP2OpenJPEG/JPEG-2000 driver based on OpenJPEG library
> Files: T21KZP_20171212T134159_B02.jp2
> ...
> Band 1 Block=1024x1024 Type=UInt16, ColorInterp=Gray
>   Min=602.000 Max=1576.000
>   Minimum=602.000, Maximum=1576.000, Mean=916.799, StdDev=123.509
>   Overviews: 5490x5490, 2745x2745, 1372x1372, 686x686
>   Overviews: arbitrary
>   Metadata:
>     STATISTICS_MAXIMUM=1576
>     STATISTICS_MEAN=916.7992
>     STATISTICS_MINIMUM=602
>     STATISTICS_STDDEV=123.50943477872
>   Image Structure Metadata:
>     COMPRESSION=JPEG2000
>     NBITS=15
>
> Just to check, I imported with r.in.gdal and I'm getting exactly the same
> as with r.sentinel.import.
>
> What am I doing wrong here? Why would r.in.gdal change values like that?
> What else needs to be set? I don't remember to have this problem before and
> it happens in all bands as far as I've checked.
>
> Ah, I'm using trunk r72203
>
> Thanks in advance for any help :)
>
> Cheers,
> Vero
>
>
>
>
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