Grid examples have been provided to demonstrate the utility of the grid generation software.
The python gridtools library uses a default radius of GRS80 or 6.378137e6 meters. The ROMS grids are based on a radius of 6370.e3 meters if passed through the pyroms conversion script.
This grid description was provided by Kate Hedstrom.
This grid is Lambert Conformal Conic. Grid resolution is 10km (10000 meters) The LCC attributes are: Standard parallel latitudes: 40.0 and 60.0 North (lat_1, lat_2) Central longitude: -91.0 West (lon_0) Central latitude: unknown (seems ok for plotting) Corner points: (-130,0N) (-220,70N)
PROJ: +proj=lcc +lat_1=40.0 +lat_2=60.0 +lon_0=-91.0
The code creates a grid in spherical coordinates. It appears the final grid is in Lambert Conformal Conic. The code allows a tilt to be provided as input.
This example recreates the the grid demonstrated by Niki Zadah's jupyter notebook.
This grid description was provided by Kate Hedstrom.
This grid is in the North Polar Stereo projection. This grid has a central longitude of 160.0 West. The true scale latitude is unknown. Kate thinks it might be 90N? Having true scale latitude unset for plotting seems to work.
PROJ: +proj=stere +lat_0=90 +lon_0=-160.0 +R=6370000
IBCAO is a North Polar Stero projection grid. The technical reference describes the grid in full detail. See page 9 for grid format.
A Polarstereographic projection with the true scale at 75 °N is “preserved” in the Cartesian grid. The horizontal datum is World Geodetic System (WGS84).
The center of the grid is the North Pole.
Grid corners:
X Y lon lat
-------- -------- ------ -------------
-2902500 +2902500 -135.0 +53:49:1.4687
+2902500 +2902500 +135.0 +53:49:1.4687
-2902500 -2902500 -45.0 +53:49:1.4687
+2902500 -2902500 +45.0 +53:49:1.4687
PROJ: +proj=stere +lat_0=90 +lat_ts=75.0 +lon_0=0.0 +ellps=WGS84