SER_DNR

Polygon coverage showing three forest cover seral stage classes--late seral, mid seral, and 
early seral--along with non-forested, other forest, and water. 
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The coverage is based on data developed from 1988 Landsat Thematic Mapper (TM) 
satellite imagery for the Oregon Department of Forestry. Originally developed at a 
resolution of 25 meters this coverage has been resampled to a resolution of 100 meters.

The various GRID-CODE classes are defined as follows:

1 -- Late seral stage: greater than 70% tree crown closure with greater than 10% of total 
crown closure in trees 21 inches diameter at breast height (dbh) or more, and not more than 
75% of total crown closure in hardwoods.

2 -- Mid seral stage: greater than 70% tree crown closure with less than 10% of total crown 
closure in trees 21 inches diameter dbh or more, and not more than 75% of total crown 
closure in hardwoods.

3 -- Early seral stage: greater than 10% and less than 70% tree crown closure and not more 
than 75% of total crown closure in hardwoods.

4 -- Other: less than 10% crown closure of conifers and/or greater than 75% of total crown 
closure in hardwoods.

5 -- Water: open water.

6 -- Non-forested: not forestland as determined by 1:250,000 scale USGS landuse 
coverage.