wiki:GridMapNames

Version 6 (modified by edavis, 11 years ago) (diff)

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Grid Mapping: Adding new grid mappings

Title

Add new grid mappings to the existing list.

Requirement

A number of grid mappings are being used that are not listed in CF. Make additions to the existing list.

This is a follow-up proposal to the proposal in CF Trac ticket #18.

Summary of Change

Add new grid mappings and required attributes.

Benefit

Allow existing data using non-CF defined grid mappings to be CF compliant.

Status Quo

CF compliant data using grid mappings that are not supported by CF.

Initial Statement of Technical Proposal

Add Examples to Appendix F

Mercator

grid_mapping_name = mercator
Map parameters:
  • longitude_of_projection_origin
  • latitude_of_projection_origin
  • Either standard_parallel or scale_factor_at_projection_origin
  • standard_parallel
Map coordinates:

The x (abscissa) and y (ordinate) rectangular coordinates are identified by the standard_name attribute value projection_x_coordinate and projection_y_coordinate respectively.

Notes:

Notes on using the PROJ.4 software packages for computing the mapping may be found at http://www.remotesensing.org/geotiff/proj_list/mercator_1sp.html ("Mercator (1SP)" or EPSG 9804) or http://www.remotesensing.org/geotiff/proj_list/mercator_2sp.html ("Mercator (2SP)" or EPSG 9805).