11. Grids

Polar2Grid allows users to remap to one or more projected grids. A grid defines the uniform geographic area that an output image covers. Polar2Grid comes with various grids to choose from that should suit most users and their use cases. Some grids are provided for specific writers (like AWIPS SCMI), but can be used for other writers as well. For those cases that the provided grids aren’t enough it is possible to create your own custom grids. See the Custom Grids documentation for help with this.

11.1. Provided Grids

Below are descriptions for a few of the grids provided with Polar2Grid. For information on all of the grids provided by Polar2Grid see the Grids Configuration File.

The grids’ projections are defined using PROJ.4. Go to the PROJ documentation for more information on what each projection parameter means.

Note

If the grid does not have a parameter specified it will be derived from the data during remapping. This allows for grids that fit to the data (dynamic grids).

11.1.1. WGS84 Dynamic Fit

Grid Name

wgs84_fit

Description

Longitude/Latitude WGS84 Grid

PROJ.4 String

+proj=latlong +datum=WGS84 +ellps=WGS84 +no_defs

Grid Width

None

Grid Height

None

X Pixel Size

0.0057 degrees

Y Pixel Size

0.0057 degrees

X Origin

None

Y Origin

None

11.1.2. WGS84 Dynamic Fit 250m

Grid Name

wgs84_fit_250

Description

Longitude/Latitude WGS84 Grid at ~250m resolution

PROJ.4 String

+proj=latlong +datum=WGS84 +ellps=WGS84 +no_defs

Grid Width

None

Grid Height

None

X Pixel Size

0.00225 degrees

Y Pixel Size

0.00225 degrees

X Origin

None

Y Origin

None

11.1.3. Lambert Conic Conformal Dynamic Fit

Grid Name

lcc_fit

Description

1km East CONUS centered lcc grid (alias: lcc_na)

PROJ.4 String

+proj=lcc +datum=WGS84 +ellps=WGS84 +lat_0=25 +lon_0=-95

Grid Width

None

Grid Height

None

X Pixel Size

1000 meters

Y Pixel Size

1000 meters

X Origin

None

Y Origin

None

11.1.4. High Resolution Lambert Conic Conformal Dynamic Fit

Grid Name

lcc_fit_hr

Description

400m East CONUS centered lcc grid

PROJ.4 String

+proj=lcc +datum=WGS84 +ellps=WGS84 +lat_0=25 +lon_0=-95

Grid Width

None

Grid Height

None

X Pixel Size

400 meters

Y Pixel Size

400 meters

X Origin

None

Y Origin

None

11.1.5. Lambert Conic Conformal - South America Centered

Grid Name

lcc_sa

Description

1km South America centered lcc grid

PROJ.4 String

+proj=lcc +datum=WGS84 +ellps=WGS84 +lat_0=-25 +lat_1=-25 +lon_0=-55 +units=m +no_defs

Grid Width

None

Grid Height

None

X Pixel Size

1000 meters

Y Pixel Size

1000 meters

X Origin

None

Y Origin

None

11.1.6. Lambert Conic Conformal - Europe Centered

Grid Name

lcc_eu

Description

1km Europe centered lcc grid

PROJ.4 String

+proj=lcc +datum=WGS84 +ellps=WGS84 +lat_0=25 +lat_1=25 +lon_0=15 +units=m +no_defs

Grid Width

None

Grid Height

None

X Pixel Size

1000 meters

Y Pixel Size

1000 meters

X Origin

None

Y Origin

None

11.1.7. Lambert Conic Conformal - South Africa Centered

Grid Name

lcc_south_africa

Description

1km South Africa centered lcc grid

PROJ.4 String

+proj=lcc +datum=WGS84 +ellps=WGS84 +lat_0=-25 +lat_1=-25 +lon_0=25 +units=m +no_defs

Grid Width

None

Grid Height

None

X Pixel Size

1000 meters

Y Pixel Size

1000 meters

X Origin

None

Y Origin

None

11.1.8. Lambert Conic Conformal - Australia Centered

Grid Name

lcc_aus

Description

1km Australia centered lcc grid

PROJ.4 String

+proj=lcc +datum=WGS84 +ellps=WGS84 +lat_0=-25 +lat_1=-25 +lon_0=135 +units=m +no_defs

Grid Width

None

Grid Height

None

X Pixel Size

1000 meters

Y Pixel Size

1000 meters

X Origin

None

Y Origin

None

11.1.9. Lambert Conic Conformal - Asia Centered

Grid Name

lcc_asia

Description

1km Asia centered lcc grid

PROJ.4 String

+proj=lcc +datum=WGS84 +ellps=WGS84 +lat_0=25 +lat_1=25 +lon_0=105 +units=m +no_defs

Grid Width

None

Grid Height

None

X Pixel Size

1000 meters

Y Pixel Size

1000 meters

X Origin

None

Y Origin

None

11.1.10. Polar-Stereographic North Pacific

Grid Name

polar_north_pacific

Description

400m Northern Pacific Grid

PROJ.4 String

+proj=stere +datum=WGS84 +ellps=WGS84 +lat_0=90 +lat_ts=45.0 +lon_0=-170

Grid Width

None

Grid Height

None

X Pixel Size

400 meters

Y Pixel Size

400 meters

X Origin

None

Y Origin

None

11.1.11. Polar-Stereographic South Pacific

Grid Name

polar_south_pacific

Description

400m Southern Pacific Grid

PROJ.4 String

+proj=stere +datum=WGS84 +ellps=WGS84 +lat_0=-90 +lat_ts=-45.0 +lon_0=-170

Grid Width

None

Grid Height

None

X Pixel Size

400 meters

Y Pixel Size

400 meters

X Origin

None

Y Origin

None

11.1.12. Polar-Stereographic Alaska

Grid Name

polar_alaska

Description

400m Northern Grid over Alaska

PROJ.4 String

+proj=stere +datum=WGS84 +ellps=WGS84 +lat_0=90 +lat_ts=60.0 +lon_0=-150

Grid Width

None

Grid Height

None

X Pixel Size

400 meters

Y Pixel Size

400 meters

X Origin

None

Y Origin

None

11.1.13. Polar-Stereographic Canada

Grid Name

polar_canada

Description

1km Northern Grid over Canada

PROJ.4 String

+proj=stere +datum=WGS84 +ellps=WGS84 +lat_0=90 +lat_ts=45.0 +lon_0=-150

Grid Width

None

Grid Height

None

X Pixel Size

1000 meters

Y Pixel Size

1000 meters

X Origin

None

Y Origin

None

11.1.14. Polar-Stereographic Russia

Grid Name

polar_russia

Description

400m Northern Grid over Russia

PROJ.4 String

+proj=stere +datum=WGS84 +ellps=WGS84 +lat_0=90 +lat_ts=45.0 +lon_0=50

Grid Width

None

Grid Height

None

X Pixel Size

400 meters

Y Pixel Size

400 meters

X Origin

None

Y Origin

None

11.1.15. Equirectangular Fit

Grid Name

eqc_fit

Description

250m Grid centered over -100 longitude

PROJ.4 String

+proj=eqc +datum=WGS84 +ellps=WGS84 +lat_ts=0 +lon_0=-100 +units=m +no_defs

Grid Width

None

Grid Height

None

X Pixel Size

250 meters

Y Pixel Size

250 meters

X Origin

None

Y Origin

None

11.1.16. GOES-East 1km

Grid Name

goes_east_1km

Description

1 kilometer resolution GOES-16 Full Disk

11.1.17. GOES-East 4km

Grid Name

goes_east_4km

Description

4 kilometer resolution GOES-16 Full Disk

11.1.18. GOES-East 8km

Grid Name

goes_east_8km

Description

8 kilometer resolution GOES-16 Full Disk

11.1.19. GOES-East 10km

Grid Name

goes_east_10km

Description

10 kilometer resolution GOES-16 Full Disk

11.1.20. GOES-West 1km

Grid Name

goes_west_1km

Description

1 kilometer resolution GOES-17 Full Disk

11.1.21. GOES-West 4km

Grid Name

goes_west_4km

Description

4 kilometer resolution GOES-17 Full Disk

11.1.22. GOES-West 8km

Grid Name

goes_west_8km

Description

8 kilometer resolution GOES-17 Full Disk

11.1.23. GOES-West 10km

Grid Name

goes_west_10km

Description

10 kilometer resolution GOES-17 Full Disk