Projection

This section describes the “Projection” controls for generation of the model grid.

Projection

Three grid projections are supported:

Mercator

Lambert Conformal Conic

Stereographic

Please see Cartopy projection list for more details on these projections.

The gridtools library attempts to conform to Proj terminology for setting projection parameters such as latitude of true scale.

Here is a comparison of Cartopy mapping parameters to parameters for use with Proj and Gridtools:

Cartopy

Proj

Gridtools

central_latitude

lat_0

lat_0

central_longitude

lon_0

lon_0

standard_parallels

lat_1, lat_2

lat_1, lat_2

latitude_true_scale

lat_ts

lat_ts

Tilt is allowed to be specified for all projections. Conformality of Lambert Conformal Conic grids has been confirmed with usage of a tilt value that is non-zero.

Setting of false_easting or false_northing values is not implemented.