SPTH_POLY: The Site Potential Tree Height (SPTH_POLY) dataset represents spatial location and basic information about the average maximum height of the tallest dominant trees (200 years or older) for a given site class in Western Oregon. Site potential tree heights generally range from 140 feet to 240 feet, depending on site productivity.

TPCC_POLY: Timber Production Capability Class (TPC) shows areas of BLM-managed lands in Western Oregon that are classified according to the physical and biological capability of the site to support and produce forest products. This data was generated from a variety of data sources over a relatively long period of time. Accuracy of the data, relative to related data and current versions of source data, may be highly variable. Site specific questions of scale and accuracy should be directed to the TPC data steward. This data has been edited for public release.

,FOIVEG_PUB_POLY: Forest Operations Vegetation Inventory Polygon feature class is a forest centric classification of vegetation with polygons that cover 100 % of western Oregon BLM lands. It describes forested lands in great detail and non-forest lands with broad and general classifications. For a complete description of this data and its structure see the FOI Vegetation Spatial Data Standard.,

,FOIVEG_PUB_POLY: Forest Operations Vegetation Inventory Polygon feature class is a forest centric classification of vegetation with polygons that cover 100 % of western Oregon BLM lands. It describes forested lands in great detail and non-forest lands with broad and general classifications. For a complete description of this data and its structure see the FOI Vegetation Spatial Data Standard.,

FOIVEG_PUB_POLY: Forest Operations Vegetation Inventory Polygon feature class is a forest centric classification of vegetation with polygons that cover 100 % of western Oregon BLM lands. It describes forested lands in great detail and non-forest lands with broad and general classifications. For a complete description of this data and its structure see the FOI Vegetation Spatial Data Standard.

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AP_CENTER_POINT: This data depicts the center points of aerial photographs of BLM lands in Oregon and Washington..

ACEC_POLY: This data set shows the distribution of Areas of Critical Environmental Concern (ACEC) under BLM management in Oregon and Washington.

WLD_CHAR_ARC: This theme represents the results of an inventory of wilderness characteristics found, or not found, on BLM lands in Oregon and Washington. This data set shows the lines for polygons for areas found to possess wilderness characteristics, plus boundary lines for those areas that were intensively inventoried and found to not meet minimum wilderness criteria. All BLM lands outside of designated Wilderness Areas and Wilderness Study Areas are periodically evaluated for wilderness characteristics based on meeting minimum criteria for size, naturalness and outstanding opportunities for solitude or primitive and unconfined recreation. Where such inventories have been updated, those BLM lands not depicted by polygon lines were deemed to clearly lack wilderness characteristics in an initial scan of size and roadlessness to determine areas warranting more intensive inventory.