Martin Desruisseaux created SIS-449:
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Summary: Extension to CF-conventions for bands in a netCDF variable
Key: SIS-449
URL: https://issues.apache.org/jira/browse/SIS-449
Project: Spatial Information Systems
Issue Type: Improvement
Components: Storage
Reporter: Martin Desruisseaux
Assignee: Martin Desruisseaux
Fix For: 1.0
The _Global Change Observation Mission - Water (GCOM-W)_ files have content
like below (simplified):
{noformat}
variables:
short "Geophysical Data"(1976, 243, 2)
float SCALE FACTOR = 0.01
string UNIT = "C"
float "Latitude of Observation Point"(1976, 243)
string UNIT = "deg"
float "Longitude of Observation Point"(1976, 243)
string UNIT = "deg"
{noformat}
The "Geophysical data" variable is of size 1976 × 243 × 2, but the last
dimension of size 2 is not defined anywhere in the file and does not correspond
to any variable. We can build a Coordinate Reference System (CRS) with latitude
and longitude axes, but we can not include in that CRS the third dimension
since we don't know if it should be a depth, a time or other kind of axis. That
third dimensions could be interpreted as bands however.
We take the assumption that this dimension of size 2 means 2 bands. We support
multi-banded images for other formats (e.g. GeoTIFF), but multi-bands in a
NetCDF file is more unusual since a common practice is to use different
variables instead (actually the netCDF format does not have any explicit
concept of band). This task is about upgrading the netCDF reader for
interpreting the dimensions that are not Coordinate Reference System dimensions
as bands.
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