Last updated February 14, 2000. The simplest geographic presentation of data rely on occurrence by sample plot location. Estimates show the average cubic foot volume per acre for trees 1.0 inches and larger diameter at breast height for specific locations. This illustration includes National Forest boundaries for Arkansas.
Grain size is smaller to accomodate local management needs.
Kriging The map for east Texas depicts land use , as recorded by FIA for the 1992 survey. I interpolated and depicted the surface with a 2.4 km grid, and overlain by ounty-level ecological subregion boundaries. Kriging takes advantage of the relationship between a point's correlation with nearby points, and provides estimates that weight a point's value according to its distance from other values. Unlike simple moving average interpolation, changing the radius will usually yield only small differences in resulting patterns. Miscellaneous examples for National Forest land.