Call for tenders' details
Status
Submission date
26/04/2019
Answer date
03/05/2019
Language
Status
Answered
Question details
Subject
QA Layer pp19
Question
What is exactly meant with QA layer? Is it a raster?
Answer
03/05/2019
A QA layer of a raster ‘data-file’ is typically also a raster. It must have the very same format and spatial specifications as the data-files. Every data pixel shall be accompanied by the relevant QA information. For storage efficiency the QA information is typically bit-encoded (i.e. several quality related parameters are stored inside a 16bit string, which need to be encoded before becoming usable). Whether the QA layer shall be stored in a separated file as a layer inside the data-file will be discussed during the initial phase of project implementation. A QA layer is expected to deliver all the needed and relevant information about the quality of the actual data-file (pixels). We decided not to define QA information content too strictly, in order to allow tenderers to elaborate the most comprehensive and appropriated approach for the specific proposal.
Original question
