I have a question of coordinate system after going through available documents.
Correct me if I am wrong.
Accodring to the CF-Convnetions, parameters such as projection approaches (eg.
Lambert_Conformal_projection) are specified. However, I find no information
about the DATUM. Although it is assumed to be WGS84, there is possiblity for
data in other datum such as Bessel-1841 specified in RT90. My question is, why
not make the DATUM as a standard parameter? With all the effort being made by
ncML, the inconsistency with other correctly geo-referencing dataset is still
possible due to the lack of DATUM parameter. Am i naive or
missing/misunderstanding something on the issue?
ps. some ideas about ncML and netCDF, please correct me if I am wrong
One crucial point is that the ncML is the metadata of netCDF files. Information
in ncML is orginated from netCDF. It's true that users can edit ncML to make it
more complete, however, it still depends on the header of netCDF. Suppose, a
user trying to create a data in his national coordinate system (eg. RT90) using
CF-Conventions. The user specified the projections and relevant parameters. It
seems fine at first. However, when the data is distributed and people who
download the data can't be able to know that the datum is Bessel-1841 which
specified in RT90. The system would transfer the coordinate system using WGS84
as datum. That, eventually, would lead to inconsistency with other data.
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