Interagency Clearinghouse of Ecological Information

Calculation of Fire Regime Condition Class (FRCC) for
Pacific Northwest (Region 6) National Forests (2/10/2010)

Tools and Data Layers Used

All FRCC calculations were done in ArcGIS 9.3.1 with the FRCC Mapping Tool version 2.2.0, using Landfire Biophysical Settings (BpS) and Succession Class (S-Class) layers and the default Landfire Reference Condition table (LFnat_west). All calculations were performed at a 30-meter resolution. Input BpS and S-Class layers were downloaded using the Landfire Data Access Tool version 2.2 (configuration database version 1.27, feature database version 1.02).

Three landscape levels were used in all calculations, the 4th, 5th and 6th field HUCs from the "Pacific NW Sixth Field Hucs" GIS layer from Bonneville Power Administration (Subbasins, Watersheds and Subwatersheds, resp.).

FRCC Calculation Procedure

For each of the sixteen National Forests and the Columbia River Gorge National Scenic Area, the administrative boundary of the forest/scenic area was overlaid on the regional layer of 4th-field HUCs (Subbasins). Using the Landfire Data Access Tool, BpS and S-Class data were downloaded using an extent that encompassed all Subbasins that overlapped the administrative boundary of the forest/scenic area.

The BpS and S-Class layers were unpacked and projected to the Forest Service's Region 6 Albers projection using the Landfire "Smart Assembler" tool. The regional grid of 4th, 5th and 6th-field HUCs was then clipped to the extent of the BpS grid and used as the input Landscape Levels grid in the FRCC Mapping Tool (Level 1 = Subwatersheds, Level 2 = Watersheds, Level 3 = Subbasins). For each forest/scenic area, the default Reference Condition Table (LFnat_west) was used, and Landscape and Stratum Scale output grids were computed. Finally, the output Landscape and Stratum FRCC grids were clipped to the forest/scenic area boundary.

About the data

For each National Forest/Scenic Area, two PDF maps are provided that depict the Landscape FRCC and the Stratum FRCC. The Landscape and Stratum-scale FRCC grids are provided in a single zip file for each forest/scenic area; the file will unzip into a single ArcInfo workspace containing the two grids. The PDFs, grids and workspaces for all forests/scenic area are named using the following 3-letter codes:

  • col Colville National Forest
  • crg Columbia River Gorge National Scenic Area
  • des Deschutes National Forest
  • frw Fremont-Winema National Forest
  • gip Gifford Pinchot National Forest
  • mal Malheur National Forest
  • mbs Mount Baker-Snoqualmie National Forest
  • mth Mount Hood National Forest
  • och Ochoco National Forest
  • okw Okanogan-Wenatchee National Forest
  • oly Olympic National Forest
  • rrs Rogue River-Siskiyou National Forest
  • siu Siuslaw National Forest
  • uma Umatilla National Forest
  • ump Umpqua National Forest
  • waw Wallowa-Whitman National Forest
  • wil Willamette National Forest
Summary of Landscape and Stratum FRCC Acres by Forest
Title Landscape FRCC Map Stratum FRCC Map Date Data
Oregon State Download

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4/10/2010 Download
Washington State Download

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4/10/2010 Download
Columbia River Gorge National Scenic Area Download

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2/10/2010 Download
Colville National Forest Download

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2/10/2001 Download
Deschutes National Forest Download

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2/10/2010 Download
Fremont-Winema National Forest Download

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2/10/2010 Download
Gifford Pinchot National Forest Download

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2/10/2010 Download
Malheur National Forest Download

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2/10/2010 Download
Mount Baker-Snoqualmie National Forest Download

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2/10/2010 Download
Mount Hood National Forest Download

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2/10/2010 Download
Ochoco National Forest Download

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2/10/2010 Download
Okanogan-Wenatchee National Forest Download

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2/10/2010 Download
Olympic National Forest Download

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2/10/2010 Download
Rogue River-Siskiyou National Forest Download

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2/10/2010 Download
Siuslaw National Forest Download

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2/10/2010 Download
Umatilla National Forest Download

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2/10/2010 Download
Umpqua National Forest Download

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2/10/2010 Download
Wallowa-Whitman National Forest Download

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2/10/2010 Download
Willamette National Forest Download

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Metadata
2/10/2010 Download