Reading additional metadata, SkipFactor and IgnoredValues

[gaopeng]

Attached IMG image contains metadata SkipFactorX, SkipFactorY, and IgnoredValues?. Could these metadata can be read and converted to metadata item as named.

[warmerdam]

Gao,

This image has these values in both the HistogramParameters? and StatisticsParameters? nodes. Which did you want exposed?

    HistogramParameters(Eimg_StatisticsParameters840) @ 1022 + 852 @ 1150
    + LayerNames = (no values)
    + BASEDATA(ExcludedValues): 1x1 of u8
    + ExcludedValues =     + 0
    + AOIname = 
    +     string = (no values)
    + SkipFactorX = 1
    + SkipFactorY = 1
...
    StatisticsParameters(Eimg_StatisticsParameters840) @ 2002 + 852 @ 2130
    + LayerNames = (no values)
    + BASEDATA(ExcludedValues): 1x1 of u8
    + ExcludedValues =     + 0
    + AOIname = 
    +     string = (no values)
    + SkipFactorX = 1
    + SkipFactorY = 1
...

[gaopeng]

The ones for Statistics will be fine.

[warmerdam]

I have added support for reading the skipx,skipy and excludedvalues items as metadata STATISTICS_SKIPFACTORX, STATISTICS_SKIPFACTORY and STATISTICS_EXCLUDEDVALUE.

Note that unlike some of the histogram related metadata, these values are not written to new datasets if present in the source dataset of a CopyCreate?().

Changes are in trunk (r18114) and 1.6-esri branch (r18115). There is also a limited test in the test suite now (r18113).

[gaopeng]

The STATISTICS_EXCLUDEDVALUE can contain multiple values, e.g. 0,1. Can it be renamed to STATISTICS_EXCLUDEDVALUES?

[warmerdam]

Gao,

Yes, but the current implementation will only capture one value. Could you provide a sample data file with more than one exclude value?

[gaopeng]

The img has ignore values 0, 8, and 9

[warmerdam]

I have renamed the metadata item to STATISTICS_EXCLUDEDVALUES, added support for multiple values and also corrected so the values are fetched as double rather than integers. The dem10.img file now reports:

    STATISTICS_SKIPFACTORX=1
    STATISTICS_SKIPFACTORY=1
    STATISTICS_EXCLUDEDVALUES=0,8,9

The changes are in trunk with a test (r18157), and in 1.6-esri without a test (r18158).