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From "Martin Desruisseaux (Jira)" <j...@apache.org>
Subject [jira] [Closed] (SIS-449) Extension to CF-conventions for bands in a netCDF variable
Date Sun, 20 Oct 2019 19:30:00 GMT

     [ https://issues.apache.org/jira/browse/SIS-449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Desruisseaux closed SIS-449.
-----------------------------------

> 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
>            Priority: Major
>             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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