No Data values being are used in MNF - NV5 Geospatial

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Last Post 01 Oct 2022 06:33 AM by MariM

No Data values being are used in MNF

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Alexander Gunyon

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29 Sep 2022 07:39 AM
I have set the No Data value in the envi header file but these no data values are being used in the MNF. I know the no data setting is effective because it has removed the black area that was previously around the image. This black area that was removed by the no data tag reappears after running forward "mnf estimate noise statistics", implying this no data area is being used in the MNF stats? How do I stop this from happening? Thanks

MariM

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01 Oct 2022 06:33 AM
Nodata values will not be ignored with in the shift difference statistics calculation in the MNF tool. The shift difference areas is intended to be a subset of homogeneous pixels where noise can be estimated and should not contain Nodata values. I would suggest you use a subset of data only area in your image to use for the shift difference noise statistic estimate.

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