===================================================================== =========================== UNIX_GIS ================================ ===================================================================== This directory contains the key GIS layers used to make the FARSITE input data found in the other directories. All files in this directory are in ARCINFO 7.2.1 UNIX format and were created on an IBM RS6000 running AIX 4.3. These files were included to work with the PC version of ARCVIEW 3.0 and the UNIX version of ARCINFO or ARCVIEW software. To download these layers, copy the ENTIRE UNIX_GIS directory to your pc. DO NOT try to download individual layers under UNIX_GIS -- if this is done, ARCINFO & ARCVIEW will NOT be able to load them properly. A complete description of the methods used to create these layers is included in the DOC directory. All layers in this directory should be referred to as GNFC Version 1.0, and have been produced at the Rocky Mountain Fire Sciences Laboratory, unless otherwise specified. In addition, all layers are in UTM Zone 12 projection, NAD27 and cover the complete geographic area of the GNFC (unless other- wise specified). Several of these layers were cut into 7.5 minute quads and exported as ASCII files to be used with the PC version FARSITE. These ASCII files have been included in other directories on this CD. ===================================================================== ======================== Layer Info ================================= ===================================================================== FARSITE INPUT LAYERS: The following layers were used to make the LANDSCAPE files needed to run FARSITE. These layers are in raster format at a 30 meter pixel size. The LANDSCAPE files are included in the zipped quad file in the QUADS directory. LANDSCAPE files are not GIS layers, but were built from ASCII files derived from these layers by using FARSITE. ELEVATION -- Elevations (meters): Were generated from DEM files obtained from Geometronics Service Center in Salt Lake. All quads were patched together. Slivers of no-data values were removed. Level 1 DEMs were filtered to remove horizontal banding. ASPECT -- Aspect (degrees): Were derived from the ELEVATION layer using the following GRID functions: ASPECT_T1 = aspect(ELEVATION) ASPECT_T2 = con(ASPECT_T1 ge 0, int(ASPECT_T1 + 0.5), int(ASPECT_T1)) ASPECT_T3 = con(SLOPE_DEGREE == 0, -1, ASPECT_T2) Flat slopes (slope equal to 0 degrees) were mapped with an Aspect value of -1. Aspect ranges from 1 through 360. SLOPE_DEGREE -- Slope (degrees): Were generated from the ELEVATION layer using the following GRID function: SLOPE_DEGREE = int(slope(ELEVATION, degree) + 0.5) CBHM10_V1 -- Crown Height (meters * 10): Crown base height. The distance between the base of a tree to the bottom of the live crown. This value represents the flame height necessary to enable the transition from surface to crown fire and accounts for ladder fuels. Heights were calculated by averaging field data to PVT, Cover Type, and Structural Stage combinations. Non-forest types were assigned a zero. CBD100_V1 -- Crown Bulk Density (kg/m^3 * 100): Crown Bulk Density. The weight per unit volume of the crown. The layer was multiplied by 100 to convert values into integers to save on disk space [(kg/m^3) * 100]. Crown Bulk Density was assigned based on the combination of Canopy Cover, Cover Type, and Structural Stage. Non-forest types were assigned a zero. CANCOV_V1 -- Canopy cover (percent): Derived from an unsupervised classification of Landsat Thematic Mapper imagery with categories taken from field data. VALUE CATEGORY 0 No Cover 3 1-5% canopy cover 10 5-15% canopy cover 20 15-25% canopy cover 30 25-35% canopy cover 40 35-45% canopy cover 50 45-55% canopy cover 60 55-65% canopy cover G 70 65-75% canopy cover 80 75-85% canopy cover 90 85-95% canopy cover STDHTM_V1 -- Stand Height (meters): Stand Height was calculated from field data by averaging stand height values to PVT, Cover Type, and Structural Stage combinations. Non-forest types were assigned a zero. FBFMNORM_V1 -- Fire Behavior Model -- Normal (classes): This map represents Anderson's fire behavior fuel model for normal fire conditions. Fire behavior fuel models were assigned to combinations of PVT, Cover Type, and Structural Stage by summarizing field data. VALUE CATEGORY 1 Anderson Fire Behavior Model 1 2 Anderson Fire Behavior Model 2 5 Anderson Fire Behavior Model 5 6 Anderson Fire Behavior Model 6 8 Anderson Fire Behavior Model 8 9 Anderson Fire Behavior Model 9 10 Anderson Fire Behavior Model 10 50 Custom Fuel Model 98 Water 99 Other non-fuel: rock/barren FBFMSEV_V1 -- Fire Behavior Model -- Severe (classes): This map represents the fire behavior fuel model for severe fire conditions. Fire behavior fuel models were assigned to combinations of PVT, Cover Type and Structural Stage by summarizing field data. FUELSEV was not included in the LANDSCAPE file, but was exported to 7.5 minute quad ASCII files These ASCII files can be used by FARSITE to change the fuel conditions in the LANDSCAPE file. They are included in the zipped quad file in the QUADS directory. ===================================================================== ********************************************************************* FARSITE BACKGROUND LAYERS: The following layers were added to be included as background features in FARSITE. All layers are in Vector format and have been exported into several 7.5 minute quad ASCII files. These ASCII files are located in other directories on this CD. CONTOURS_100M -- Contours (100 meter intervals): 100 meter contour lines were generated from the 30 meter ELEVATION layer using the LATTICECONTOUR command in ARC/INFO. ASCII files are included in the zipped quad file in the QUADS directory. STREAMS -- Streams: This version of streams and water bodies was obtained from the Gila National Forest, Silver City, in September 1998. Streams were generated from USGS 1:24,000 Cartographic Feature Files (CFF) and edited by Gila NF GIS staff. CFFs for a few quads on the Cibola NF were added to this layer at the Fire Sciences Lab. ASCII files are included in the zipped quad file in the QUADS directory. ** NOTE: CFFs are not available for all quads in the GNFC ROADS -- Roads: This version of roads was created by combining a roads layer obtained from the Gila National Forest and a roads layer generated from USGS 1:24,000 Cartographic Feature Files. Roads within the Gila NF boundary were derived from the Gila NF layer; roads outside the Gila NF came from CFFs. ASCII files are included in the zipped quad file in the QUADS directory. ** NOTE: CFFs were not available for all quads, and roads were not edge-matched between the two original layers. TRAILS -- Trails: This version of trails was created by combining a trails layer from the Gila National Forest and a trails layer generated from USGS 1:24,000 Cartographic Feature Files . Trails within the Gila NF boundary were derived from the Gila NF layer; trails outside the Gila NF came from CFFs. ASCII files are included in the zipped quad file in the QUADS directory. ** NOTE: CFFs were not available for all quads, and trails were not edge-matched between the two original layers. WILDERNESS -- Wilderness Boundary: A coverage delineating the ila Wilderness and Aldo Leopold Wilderness boundaries. Obtained from the Gila National Forest. ASCII file is located in the BOUNDARY directory. FOREST_BDY -- Boundary of the Gila National Forest and the portion of the Cibola National Forest that lies in the GNFC. ASCII file is located in the BOUNDARY directory. GNFC_BDY Gila National Forest Complex Boundary which is the intersection of the boundaries of the Gila and Cibola National Forests and the classified satellite imagery. ===================================================================== ********************************************************************* BASE LAYERS USED TO CREATE FARSITE LAYERS: The following layers were used to create the FARSITE spatial data layers and/or to assist field crews in sampling. These layers are NOT included anywhere else on this CD. Raster Layers: PVT_V1 -- Potential Vegetation Type: The potential vegetation type map was derived using a terrain model approach where a topographical rulebase assigns potential vegetation type categories to combinations of elevation, aspect, and slope. From this initial terrain model map, PVT categories were assigned to the polygons delineated by analysis of the TM imagery and refined by overlaying them with the cover type layer. CT_V1 -- Cover Type: The cover type map was created from a combined supervised-unsupervised satellite imagery classification of two LANDSAT (TM) scenes. Cover types were refined by overlaying them with the PVT layer, allowing certain cover types to be constrained to only those environments where they are expected to occur. SS_V1 -- Structural Stage: The structural stage map was created from the combined supervised-unsupervised satellite imagery classification of two LANDSAT (TM) scenes. Structural stages were refined by overlaying them with PVT and cover type layers. Vector Layers (All layers have been clipped to the GNFC): GNFC_BDY -- Boundary of the Gila National Forest Complex, defined by the intersection of the spatial limits of the TM scenes and the DEM coverage. GNFC_QUADS -- Quad Boundaries: 7.5 minute quads boundaries =====================================================================