Add support for scale/offset value rescaling GeoTiff files

Description

This is a way to represent float numbers using compact integer pixel values, and then applying a scale/offset to them to go onto float domain. It is a GDAL extension that is widespread due to ... well... GDAL popularity

The scale/offset machinery is enabled via a read parameter in the geotiff reader and in image mosaic, on by default on master, will likely be off by default in backports to stable series to avoid behavioral changes there.

Environment

None

Status

Assignee

Andrea Aime

Reporter

Andrea Aime

Triage

None

Fix versions

Priority

Medium
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