Hi list,
I have an issue about setting a GridSampleDimension with categories.
I have a dataset with the following attributes: fillValue, scale, offset,
valid minimum, valid maximum
The fillValue is equal to the minimun value.
As an instance: fillValue = 0;
validMin = 0; validMax = 255
scale = 0.15
offset = 0
Although the fillValue is not a "real" noData, I would like to handle it as
that.
Hence, I would like to set a GridSampleDimension with two categories: nan,
values
- The first one leveraging on the fillValue.
- the second one defining a sampleRange having the min,max values as a
NumberRange (where the minimum valid extreme is excluded) and using scale
and offset to obtain the inverse transformation for the geophysic view.
Actually I have a problem since when the CategoryList tries to define the
inverse (A GeophysicCategoryList), building the corresponding geophysic
category results in a category overlapping the noData category.
Example:
defined categories: Category("No data":[0.0 ... 0.0]),
Category("values":[4.9E-324 ... 255.0]) ---- Note the value 4.9E-324 having
defined the Minimum = 0 EXCLUDED.
resulting geophysic categories: Category("No data":[0.0 ... 0.0]),
GeophysicsCategory("values":[0.0 ... 38.25]) which overlaps.
I guess this is due to applying the transformation to the very very small
number becoming zero when transformed.
Having defined a sample range with the minimum extreme excluded, is there a
way to obtain back a GeophysicCategory with the minimum "excluded" in order
to have not overlapping categories?
Any tip, suggestion, or workaround would be greatly appreciated.
Regards,
Daniele
--
-------------------------------------------------------
Eng. Daniele Romagnoli
Software Engineer
GeoSolutions S.A.S.
Via Carignoni 51
55041 Camaiore (LU)
Italy
phone: +39 0584983027
fax: +39 0584983027
mob: +39 328 0559267
http://www.geo-solutions.it
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