Fall, 2004 National Snow and Ice Data Center 1

Spatial Types

Fall, 2004 National Snow and Ice Data Center 2

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

Fall, 2004 National Snow and Ice Data Center 7

SSM/I Ease-grid

Fall, 2004 National Snow and Ice Data Center 8

SSM/I EASE Grid - Coverage

Fall, 2004 National Snow and Ice Data Center 9

Polar Stereo (Sea Ice)

Fall, 2004 National Snow and Ice Data Center 10

Polar Stereo (Sea Ice) - Coverage

Fall, 2004 National Snow and Ice Data Center 11

Polar Stereo (Sea Ice) - Coverage

Fall, 2004 National Snow and Ice Data Center 12

Polar Stereo (Sea Ice) - Coverage

Fall, 2004 National Snow and Ice Data Center 13

Polar Stereo (Sea Ice) - Coverage

Fall, 2004 National Snow and Ice Data Center 14

Polar Stereo (Sea Ice) - Coverage

Fall, 2004 National Snow and Ice Data Center 15

Polar Stereo (Sea Ice) - Coverage

Fall, 2004 National Snow and Ice Data Center 16

Tiles

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05v08h Coverage

Fall, 2004 National Snow and Ice Data Center 18

05v08h w/ lat/lon bounding box

Fall, 2004 National Snow and Ice Data Center 19

05v08h Spherical

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AVHRR L1b (Scene)

Fall, 2004 National Snow and Ice Data Center 21

AVHRR L1b (Scene) - Coverage

Fall, 2004 National Snow and Ice Data Center 22

AVHRR L1b (Scene) - Coverage

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AVHRR L1b (Scene) - Coverage

Fall, 2004 National Snow and Ice Data Center 24

AVHRR L1b (Scene) - Coverage

Fall, 2004 National Snow and Ice Data Center 25

AVHRR L1b (Scene) - Coverage

Fall, 2004 National Snow and Ice Data Center 26

Weird Shape

Fall, 2004 National Snow and Ice Data Center 27

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

Fall, 2004 National Snow and Ice Data Center 30

Full Orbit – Spherical Blocks

Fall, 2004 National Snow and Ice Data Center 31

Full Orbit - Coverage

Fall, 2004 National Snow and Ice Data Center 32

Full Orbit - Coverage

Fall, 2004 National Snow and Ice Data Center 33

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.