Photo Interpreted Maps

These datasets are vector point coverages representing photointerpretation (PI) points that are located along a grid across 13 northeastern states under the purvue of the Northeastern Research Station. At each point along the grid, the photointerpreter assessed various characteristics of the landuse on NAPP 1:40,000 photography, and recorded
them in a database.

This dataset was used by the NE Research Station's FIA unit to choose forest inventory plots and as a first phase sample for stratified random sampling and double sampling
for stratification.

Contact: Lucretia Stewart

4 types of maps were derived from the PI data:

A. The type of forest cover.

B. The volume of forest cover or land use
(volume is a measure of the amount of wood).

C. The percent crown cover (i.e., the percent continuous
canopy coverage).

D. The distance to the nearest ecotype (change in forest
community).

Connecticut	Delaware (1 map: B)	Maine (2 maps: A & B)
Maryland (1 map: B)	Massachusetts	New Hampshire
New Jersey	New York (1 map: B)	Ohio (1 map: B)
Pennsylvania (1 map: B)		Rhode Island
Vermont		West Virginia (1 map: B)