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https://issues.apache.org/jira/browse/SIS-536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux updated SIS-536:
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Affects Version/s: 1.4
1.3
1.2
> Infer default datum from ellipsoid
> ----------------------------------
>
> Key: SIS-536
> URL: https://issues.apache.org/jira/browse/SIS-536
> Project: Spatial Information Systems
> Issue Type: Improvement
> Components: Referencing, Storage
> Affects Versions: 0.8, 1.0, 1.1, 1.2, 1.3, 1.4
> Reporter: Martin Desruisseaux
> Priority: Major
>
> When reading a GeoTIFF file (but could also happen with other sources), the
> datum name is sometime unspecified. The problem is that the datum name is
> important for determining if two datum should be considered equal. As an
> alternative, we could use one of the EPSG codes for unspecified datum. There
> is currently 40 such datum:
> {code:sql}
> SELECT datum_code, datum_name FROM "EPSG"."Datum" WHERE datum_name LIKE 'Not
> specified%' AND deprecated=FALSE
> {code}
> ||Code||Name||
> |6019|Not specified (based on GRS 1980 ellipsoid)|
> |6013|Not specified (based on Clarke 1880 (Arc) ellipsoid)|
> |6014|Not specified (based on Clarke 1880 (SGA 1922) ellipsoid)|
> |6015|Not specified (based on Everest 1830 (1937 Adjustment) ellipsoid)|
> |6016|Not specified (based on Everest 1830 (1967 Definition) ellipsoid)|
> |6018|Not specified (based on Everest 1830 Modified ellipsoid)|
> |6001|Not specified (based on Airy 1830 ellipsoid)|
> |6002|Not specified (based on Airy Modified 1849 ellipsoid)|
> |6003|Not specified (based on Australian National Spheroid)|
> |6004|Not specified (based on Bessel 1841 ellipsoid)|
> |6005|Not specified (based on Bessel Modified ellipsoid)|
> |6006|Not specified (based on Bessel Namibia ellipsoid)|
> |6007|Not specified (based on Clarke 1858 ellipsoid)|
> |6008|Not specified (based on Clarke 1866 ellipsoid)|
> |6010|Not specified (based on Clarke 1880 (Benoit) ellipsoid)|
> |6011|Not specified (based on Clarke 1880 (IGN) ellipsoid)|
> |6012|Not specified (based on Clarke 1880 (RGS) ellipsoid)|
> |6020|Not specified (based on Helmert 1906 ellipsoid)|
> |6021|Not specified (based on Indonesian National Spheroid)|
> |6022|Not specified (based on International 1924 ellipsoid)|
> |6024|Not specified (based on Krassowsky 1940 ellipsoid)|
> |6025|Not specified (based on NWL 9D ellipsoid)|
> |6027|Not specified (based on Plessis 1817 ellipsoid)|
> |6028|Not specified (based on Struve 1860 ellipsoid)|
> |6029|Not specified (based on War Office ellipsoid)|
> |6030|Not specified (based on WGS 84 ellipsoid)|
> |6031|Not specified (based on GEM 10C ellipsoid)|
> |6032|Not specified (based on OSU86F ellipsoid)|
> |6033|Not specified (based on OSU91A ellipsoid)|
> |6034|Not specified (based on Clarke 1880 ellipsoid)|
> |6036|Not specified (based on GRS 1967 ellipsoid)|
> |6041|Not specified (based on Average Terrestrial System 1977 ellipsoid)|
> |6042|Not specified (based on Everest (1830 Definition) ellipsoid)|
> |6043|Not specified (based on WGS 72 ellipsoid)|
> |6044|Not specified (based on Everest 1830 (1962 Definition) ellipsoid)|
> |6045|Not specified (based on Everest 1830 (1975 Definition) ellipsoid)|
> |6047|Not specified (based on GRS 1980 Authalic Sphere)|
> |6052|Not specified (based on Clarke 1866 Authalic Sphere)|
> |6053|Not specified (based on International 1924 Authalic Sphere)|
> |6054|Not specified (based on Hughes 1980 ellipsoid)|
> We should fallback on one of those datum when the only information are axis
> lengths. It should be okay since the name makes clear that the datum is
> actually unknown.
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