arc gis期末复习考点第十二章(3)

The global version calculates one statistic for an entire distribution, whereas the local version calculates one statistic for each feature (point or polygon).

15. The local G-statistic can be used as a tool for hot spot analysis. Why?

A cluster of high positive Z scores computed from local G-statistics suggests the presence of a cluster of high values, which is called a hot spot.

16. What does a Dissolve operation accomplish?

Dissolve aggregates features that have the same attribute value or values by removing the internal boundaries between them.

17. Suppose you have downloaded a vegetation map from the Internet. But the map is much larger than your study area. Describe the steps you will follow to get the vegetation map for your study area.

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