readValidMask and isPixelValid methods

development python
#1

Hi again

I need some help in understanding the readValidMask and the isPixelValid methods …
How are they computed? Is the result of flags applications? in case … which ones?
Are they supposed to yield the same value on the same pixels?
Is there any documentation on such methods?
I’ve seen
http://step.esa.int/docs/v5.0/apidoc/engine/org/esa/snap/core/datamodel/RasterDataNode.html#readValidMask-int-int-int-int-boolean:A-
but it isn’t very verbose … :slight_smile:
Thanks a lot in advance for any help.
Mario

How to create masked bands from imported WKT geometry in Snappy
#2

Yes, you are right. It is very silent.
I’ve added some documentation to it (readValidMask() on GitHub).

The mask is derived from the valid pixel expression (getValidPixelExpression()) and from the no-data value (getNoDataValue())

If you call getValidMaskExpression() you get a string which shows how the mask is build.