spatial types

Fall, 2004 National Snow and Ice Data Center 1

Spatial Types

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Point Data

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Sparse Point Data

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Dense Point Data

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Gridded Data

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MODIS CMG - Coverage

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SSM/I Ease-grid

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SSM/I EASE Grid - Coverage

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Polar Stereo (Sea Ice)

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Polar Stereo (Sea Ice) - Coverage

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Polar Stereo (Sea Ice) - Coverage

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Polar Stereo (Sea Ice) - Coverage

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Polar Stereo (Sea Ice) - Coverage

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Polar Stereo (Sea Ice) - Coverage

Fall, 2004 National Snow and Ice Data Center 15

Polar Stereo (Sea Ice) - Coverage

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Tiles

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05v08h Coverage

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05v08h w/ lat/lon bounding box

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05v08h Spherical

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AVHRR L1b (Scene)

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AVHRR L1b (Scene) - Coverage

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AVHRR L1b (Scene) - Coverage

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AVHRR L1b (Scene) - Coverage

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AVHRR L1b (Scene) - Coverage

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AVHRR L1b (Scene) - Coverage

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Weird Shape

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Full Orbit - Coverage

Fall, 2004 National Snow and Ice Data Center 28

Full Orbit - LLBox

Fall, 2004 National Snow and Ice Data Center 29

Full Orbit – Lat/lon Blocks

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Full Orbit – Spherical Blocks

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Full Orbit - Coverage

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Full Orbit - Coverage

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Full Orbit – Using Backtrack

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Summary

Point Data: use points or multi-points.

Grids: Use a lat/lon bounding box if appropriate, otherwise use a spherical n-gon. Accuracy is more important than speed.

Tiled Data: A form of regional grid, use a lookup table.

Scenes: Use a spherical quadrilateral, maybe up to a spherical decagon for larger scenes. Speed is more important than accuracy.

Orbits: The best way to define the coverage of an orbit is to define the orbit. The best way to search for orbital data is to search orbits. Use Backtrack.