Pyramid

A "pyramid" of square tiles. Each level of the pyramid on the way down has four times as many tiles as the previous level.

When SIS draws an Index Overlay with a Pyramid namer, only one level of the pyramid will be drawn. For example, suppose that the bottom level of the pyramid has tiles of 1000m at 1:10000 scale, then the second level of the pyramid will have tiles of 2000m at 1:20000 scale. Now if you zoom in to an effective scale of 1:10000 then SIS will only draw tiles from the bottom level, but when you zoom out to 1:20000 then SIS will only draw tiles from the second level.

The properties of the Pyramid correspond to tiles on its bottom level (e.g. the smallest tiles).

Typical tile name: 0qNNNNNN.ext, where N is between 0 and 3 and specifies a pyramid level quadrant.

namer$ argument to CreateIndexOverlay and CreateIndexCoverage

Properties


Properties

See full list of Index Dataset Naming Conventions


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