Technical grid specifications

Weather.gc.ca GRIB database

Regional GEM on low-resolution Polar-Stereographic grid

Low-resolution grid geographical coverage
Grid specifications

Table lists the values of various parameters of the low-resolution polar-stereographic grid

ni 132
nj 95
resolution at 60° N 60 km
coordinate of first grid point 27.203° N
135.213° W
(i,j) coordinate of North Pole (50.6, 111.3)
grid orientation
(with respect to j axis)
-111.0°

There is also a formatted html file (ASCII, in an easy-to-remove html wrapper) containing geographical coordinates for each grid point.

Regional GEM on full-resolution Polar-Stereographic grid

High resolution geographical grid coverage

Grid specifications

Table lists the values of various parameters of the high resolution polar-stereographic grid.

ni 493
nj 399
resolution at 60° N 15 km
coordinate of first grid point 32.549° N
134.62° W
(i,j) coordinate of North Pole (175.0, 399.0)
grid orientation
(with respect to j axis)
-111.0°

There is also a formatted html file (ASCII with an easy-to-remove html wrapper) containing geographical coordinates for each grid point.

Global GEM on low-resolution Lat-Lon grid

Low resolution global grid

Grid specifications

Table lists the values of various parameters of the low-resolution lat-lon grid.

ni 181
nj 91
resolution 2.0°
coordinate of first grid point 90° S 180° E

Global GEM on full-resolution Lat-Lon grid

High resolution global grid

Grid specifications

Table lists the values of various parameters of the high-resolution lat-lon grid.

ni 601
nj 301
resolution 0.6°
coordinate of first grid point 90° S 180° E

There is also a formatted html file containing geographical coordinates for each grid point.

Global GEM on full-resolution 30 km Polar Stereographic grid

High resolution 30 km global grid

Grid specifications

Table lists the values of various parameters of the high resolution polar-stereographic grid.

ni 247
nj 200
resolution at 60° N 30 km
coordinate of first grid point 32.549° N
134.614° W
(i,j) coordinate of North Pole (88.0, 200.0)
grid orientation
(with respect to j axis)
-111.0°

There is also a formatted html file (ASCII with an easy-to-remove html wrapper) containing geographical coordinates for each grid point.

Ensemble on low resolution lat-lon grid

Global low resolution ensemble grid for the ensemble forecast

Grid specifications

Value of parameters for the lat-lon grid for the low resolution ensemble grid

ni 144
nj 73
resolution 2.5°
coordinate of first grid point 90° S 0° E