Changes between Version 1 and Version 2 of GridMapHorizDatum


Ignore:
Timestamp:
03/06/08 11:57:25 (11 years ago)
Author:
edavis
Comment:

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  • GridMapHorizDatum

    v1 v2  
    33== Title ==
    44
    5 Add horizontal datum attributes to the existing CF grid mapping attributes.
     5Add horizontal datum attributes to the existing set of grid mapping attributes.
    66
    77== Requirement ==
    88
    9 The existing CF grid mapping attributes can define a projection method and projection coordinates but not the associated geographic coordinates.
     9Additional CF grid mapping attributes are needed before a projection can be fully specified. The existing CF grid mapping attributes can specify a projection method and projection coordinates but not the associated geographic coordinates.
    1010
    1111This is a follow-up proposal to the proposal in CF Trac ticket #18.
     
    1313== Summary of Change ==
    1414
    15 Add grid mapping attributes to describe the geographic CRS upon which the projection is based.
     15Add grid mapping attributes to describe the geographic CRS upon which the projection is based. This will include attributes that describe the horizontal datum (ellipsoid/sphere) and prime meridian along with reasonable default values.
    1616
    1717== Benefit ==
    1818
     19These additions will allow more complete specification of projections. This will allow better mapping between CF and OGC CRS.
     20
    1921== Status Quo ==
     22
     23Incomplete specification of projection information.
    2024
    2125== Initial Statement of Technical Proposal ==
     
    2327=== Add to the "Map parameters" lists in Examples F.1, F.2, F.3, F.4, F.5, F.7, and F.8 ===
    2428
    25  * semi_major_axis
     29 * semi_major_axis (use with semi_minor_axis or inverse_flattening)
    2630 * semi_minor_axis
    2731 * inverse_flattening
     32 * earth_radius (used in place of the above three attributes for spherical earth)
    2833 * longitude_of_prime_meridian
    2934