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I am looking for an english well-established term for determining:

1) invalid/nodata raster image pixels (№ 1 - black ones on the image below) and

2) valid/data raster image pixels (№ 2 - other ones on the image below)

In example:

1 - is "nodata area"

2 - is "raster's body".

enter image description here

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    You've pretty much got the terminology. NoData is the correct term. Jan 30 '18 at 9:25
  • @MappaGnosis Is "NoData" well-established term? And what about zone № 2? Jan 30 '18 at 9:48
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    "Region of interest" could suit with the YesData area but that term can also mean a more interesting area within valid image data. INSPIRE documents seem to call the net data area as "footprint" inspire.ec.europa.eu/file/1539/download?token=7AVgFWtL. NoData feels good to me. Another term I have seen is "offsite" which is known at least to MapServer.
    – user30184
    Jan 30 '18 at 9:54
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enter image description here

As mentioned in @user30184's comment in official paper "INSPIRE data specification on Orthoimagery – Technical Guidelines" these areas named as follows:

Area № 1 plus area № 2 - is bounding box.

Area № 1 - is no data values.

Area № 2 - is footprint.

Quote from page 129:

Conversely, the value 0 means that the corresponding pixel in the image holds a no data value (e.g. unknown, withheld). Typically, it must be made transparent when displaying the image.

Picture at page 32: enter image description here

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