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Please note that, as of 02 June 2008, the Polar Spatial Query tool (PSQ) is no longer available. The machine on which PSQ resided has reached its life expectancy and we do not plan to rectify the machine or the PSQ tool. Thus, orders placed after 02 June 2008 will not be fulfilled. Please contact NSIDC User Services if you have questions or concerns regarding the PSQ tool.
For information about projection and grid parameters used at NSIDC see:
Points, pixels, grids, and cells -- a mapping and gridding primer.
Projection and grid output options currently available in the PSQ are:
| EASE-Grids: | Polar Stereographic Grids: Cylindrical Grids: |
The following table summarizes the valid ranges of input values for grids used in the PSQ.
| Grid name | Grid size (col,row) | Latitude range | Longitude range |
| AVHRR EASE-Grid North 1.25 km | 7220,7220 | 29.72191° N - 90° N | 180° W - 180° E |
| AVHRR EASE-Grid South 1.25 km | 6420,6420 | 36.96667° S - 90° S | 180° W - 180° E |
| AVHRR EASE-Grid North 5 km | 1805,1805 | 29.74956° N - 90° N | 180° W - 180° E |
| AVHRR EASE-Grid South 5 km | 1605,1605 | 36.99339° S - 90° S | 180° W - 180° E |
| SSM/I EASE-Grid North 12.5 km | 1441,1441 | 0.25845° N - 90° N | 180° W - 180° E |
| SSM/I EASE-Grid South 12.5 km | 1441,1441 | 0.25845° S - 90° S | 180° W - 180° E |
| SSM/I EASE-Grid Global 12.5 km | 2766,1171 | 85.95000° N - 85.95000° S | 179.93° W - 180.07° E |
| SSM/I EASE-Grid North 25 km | 721,721 | 0.33836° N - 90° N | 180° W - 180° E |
| SSM/I EASE-Grid South 25 km | 721,721 | 0.33836° S - 90° S | 180° W - 180° E |
| SSM/I EASE-Grid Global 25 km | 1381,586 | 86.72000° N - 86.72000° S | 180° W - 180° E |
| SSM/I Polar Stereographic North 25 km | 304,448 | 30.98°N - 90°N | 180°W - 180°E |
| SSM/I Polar Stereographic North 12.5 km | 608,896 | 30.98°N - 90°N | 180°W - 180°E |
| SSM/I Polar Stereographic South 25 km | 316,332 | 39.23°S - 90°S | 180°W - 180°E |
| SSM/I Polar Stereographic South 12.5 km | 632,664 | 39.23°S - 90°S | 180°W - 180°E |
| Cylindrical Equidistant 1° | 360,180 | 90°N - 90°S | 180°W - 180°E |
| Cylindrical Equidistant 0.5° | 720,360 | 90°N - 90°S | 180°W - 180°E |
| Cylindrical Equidistant 0.25° | 1440,720 | 90°N - 90°S | 180°W - 180°E |
| Cylindrical Equidistant 5' | 4320,2160 | 90°N - 90°S | 180°W - 180°E |
| Cylindrical Equidistant 30" | 43200,21600 | 90°N - 90°S | 180°W - 180°E |
Information about temporal coverage and missing dates for some data is summarized in the following documentation:
AVHRR Polar Pathfinder Twice-Daily 1.25 km EASE-Grid Composites
AVHRR Polar Pathfinder Twice-Daily 5 km EASE-Grid Composites
SSM/I Data Availability
