Projections

North American Regional Climate Change Assessment Program

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	CRCM+CCSM CRCM+CGCM3 ECP2+GFDL ECP2+HadCM3 NEW! HRM3+GFDL HRM3+HadCM3 MM5I+CCSM MM5I+HadCM3 NEW! RCM3+CGCM3 RCM3+GFDL WRFG+CCSM WRFG+CGCM3

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Projections

The grid_mapping attribute of the main data variable in each file names a "dummy" variable whose attributes record the type and parameters of the map projection used by each RCM. Here's a summary all in one place:

CRCM

polar_stereographic:grid_mapping_name = "polar_stereographic"
polar_stereographic:latitude_of_projection_origin = 90.
polar_stereographic:standard_parallel = 60.
polar_stereographic:straight_vertical_longitude_from_pole = 263.
polar_stereographic:false_easting = 3475000.
polar_stereographic:false_northing = 7475000.

ECP2

polar_stereographic:grid_mapping_name = "polar_stereographic"
polar_stereographic:latitude_of_projection_origin = 90.
polar_stereographic:standard_parallel = 60.
polar_stereographic:straight_vertical_longitude_from_pole = 263.
polar_stereographic:false_easting = 4700000.
polar_stereographic:false_northing = 8500000.

HRM3

rotated_pole:grid_mapping_name = "rotated_latitude_longitude"
rotated_pole:grid_north_pole_latitude = 42.5
rotated_pole:grid_north_pole_longitude = 83.

MM5I

Lambert_Conformal:grid_mapping_name = "lambert_conformal_conic"
Lambert_Conformal:latitude_of_projection_origin = 47.5
Lambert_Conformal:longitude_of_central_meridian = -97.
Lambert_Conformal:standard_parallel = 30., 60.
Lambert_Conformal:false_easting = 3825000.
Lambert_Conformal:false_northing = 3200000.

RCM3

Transverse_Mercator:grid_mapping_name = "transverse_mercator"
Transverse_Mercator:latitude_of_projection_origin = 47.5
Transverse_Mercator:longitude_of_central_meridian = -97.
Transverse_Mercator:scale_factor_at_central_meridian = 1.
Transverse_Mercator:false_easting = 3900000.
Transverse_Mercator:false_northing = 3150000.

WRFG

Lambert_Conformal:grid_mapping_name = "lambert_conformal_conic"
Lambert_Conformal:latitude_of_projection_origin = 47.5
Lambert_Conformal:longitude_of_central_meridian = -97.
Lambert_Conformal:standard_parallel = 30., 60.
Lambert_Conformal:false_easting = 3325000.
Lambert_Conformal:false_northing = 2700000.

The National Center for Atmospheric Research is sponsored by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation.