The P35/R28 and P35/R29 imagers were combined into a single image and were processed separately from the P34/R28 image.
First, the images were run through unsupervised classifications to classify the image pixels into spectral classes. Using an iterative classification process with spectral signature files, each pixel was assigned to a spectral class. The pixels were then merged into regions (raster polygons) through a multi-stage merge algorithm using a variable minimum map unit based on heterogeneity of the surrounding pixels. Regions larger than 202.4 hectares were divided until all regions in the grid were less than 202.4 hectares (500 acres). The final unsupervised classifications resulted in the creation of a P34R28z grid with 903,130 regions and a P35R28Z grid with 1,022,379 regions ranging in size from 0.1 hectare to 202.2 hectares. Each region was assigned a set of attributes for TM channels 1-7 and panchromatic from the imagery, along with elevation, aspect, and slope from the 30 meter digital elevation model (DEM); these attribute values were calculated based on the mean values of the 30 meter pixels within each region.
Vegetation overstory (land cover type) for each region grid was labeled using a supervised classification. The land cover type supervised classification was performed using a combination of manual and training data classifications. All of the manual classifications were done by identifying and delineating the land cover type on the Landsat image. The water classification was done using a feature extraction software package from visual learning systems. The manual classification labels were filled into the MANLABEL field.
Manually Classified Covertypes Code Description ------------------ 1100 Urban 2010 Agricultural - Dry 2020 Agricultural - Irragated 5000 Water 7500 Mines/Quarries 9800 Clouds 9900 Cloud Shadows
Thirteen other land cover types were labeled using training data and spatial classifiers. The land cover type labels were filled into the COVERTYPE field.
Training Data Classified Covertypes Code Description (Eastside SILC3 Codes in parenthesis) ------------------------------------------------------- 3111 Created Wheatgrass 3130 Very Low Cover Grasslands 3140 Low Cover Grasslands (3150 Low / Mod Cover Grasslands) 3160 Moderate Cover Grasslands (3150 Low / Mod Cover Grasslands) 3170 Moderate / High Cover Grasslands 3370 Low Cover Sage/Xeric Shrublands (3625 Sage/Xeric Shrublands) 3390 Mod/High Cover Sage/Xeric Shrublands (3625 Sage/Xeric Shrublands) 3610 Mesic Shrublands 3640 Horizonal Juniper 4150 Mixed Broadleaf / Cottonwood Forest 4214 Rocky Mountain Juniper 4261 Ponderosa Pine - Low Cover (4206 Ponderosa Pine) 4262 Ponderosa Pine - Moderate Cover (4206 Ponderosa Pine) 4263 Ponderosa Pine - High Cover (4206 Ponderosa Pine) 7300 Rock/Barren 7601 Badlands - Grass Dominated 7602 Badlands - Shrub Dominated
Conifer tree sizeclass and canopy cover labels were assigned using a training data classification. The sizeclass and canopy cover types were combined into groups, classified, and then split back out into indvidual types. The tree sizeclass labels were filled into the TREESIZE field and the tree canopy cover labels were filled into the TREECANOPY field.
Conifer Tree Size Classes Code Description ------------------ 1 Sapling: 1.0" DBH to 4.9" DBH 2 Pole: 5.0" DBH to 8.9" DBH 3 Medium: 9.0" DBH to 14.9" DBH 4 Large: 15.0" DBH to 20.9"DBHConifer Tree Canopy Classes Code Description ------------------ 1 Very low cover: < 10% 2 Low cover: 10% to 24% 3 Low to moderate cover: 25% to 44% 4 Moderate to high cover: 45% to 64% 5 High cover: 65% to 100%
Finally, the P34R28Z and P35R28Z region grids were edgematched and combined into the CUSTSILC3Z region grid. In the overlap area, regions from the P34R28Z grid with the KEEP field equal to one were used, in the remaining areas regions from the P35R28 grid were used.
Accuracy assessments were performed on the P34R28Z and P35R28Z land cover type and tree size/canopy class labels assigned from the training data classifications. A cross validation (leave-one-out) accuracy assessment was performed using the entire training data set.
Region Grid Covertype Acc Tree Size/Canopy Acc ------------------------------------------------------ P34R28Z 82.5% 53.7% P35R28Z 82.0% 45.9%
To help track similarities and differences in map legends between this classification and previous ones (SILC1 and MT-GAP) cover type names and codes numbers were not changed if the actual types were mapped using similar training data.
Covertype Users Accuracy P34R28 P35R28 Code Description ---------------------------- 34.1 40.0 3111 Created Wheatgrass 80.5 75.9 3130 Very Low Cover Grasslands 86.2 78.3 3140 Low Cover Grasslands 90.5 74.8 3160 Moderate Cover Grasslands 66.8 72.7 3170 Moderate / High Cover Grasslands 32.6 41.9 3370 Low Cover Sage/Xeric Shrublands 36.4 85.9 3390 Mod/High Cover Sage/Xeric Shrublands 49.1 75.0 3610 Mesic Shrublands 32.5 NA 3640 Horizontal Juniper 71.5 75.3 4150 Mixed Broadleaf / Cottonwood Forest 86.4 92.3 4214 Rocky Mountain Juniper 79.5 96.5 4261 Low Cover Ponderosa Pine 95.2 95.2 4262 Moderate Cover Ponderosa Pine 99.3 94.6 4263 High Cover Ponderosa Pine 75.0 87.9 7300 Rock/Barren 84.2 70.0 7601 Badlands - Grass Dominated 83.3 82.4 7602 Badlands - Shrub Dominated --------------------------------------- 82.8 82.0 Overall AccuracyConifer Sizeclass Users Accuracy P34R28 P35R28 Code Description (Eastside SILC3 Codes in parenthesis) ---------------------------- 82.7 0.0 1 Sapling: 1.0" DBH to 4.9" DBH 53.9 42.0 2 Pole: 5.0" DBH to 8.9" DBH 54.3 47.4 3 Medium: 9.0" DBH to 14.9" DBH 34.5 46.4 4 Large: 15.0" DBH to 20.9"DBH ----------------------------------------- 53.3 45.9 Overall Accuracy
MAKE_DEM: extracted a digital elevation model (DEM) from the WSAL database for use during labeling.
BUILD_VAT: built an ArcInfo value attribute table (VAT) to hold all items (fields) for which descriptive data could be developed for each region. Filled in VALUE, COUNT, LINK, HECTARES, PERIMETER, TM1, TM2, TM3, TM4, TM5, TM6, TM7, PAN, TM1STD, TM2STD, TM3STD, TM4STD, TM5STD, TM6STD, TM7STD, PANSTD, MNDVI, ELE, SLP, ASP, and SLPASP fields, a second Landsat image data was filled into TM1B, TM2B, TM3B, TM4B, TM5B, TM6B, and TM7B fields.
Grass Covertypes were recoded into grass cover classes using MNDVI values: P34R28 P35R28 Code Description --------------------------- < 11 < 4 3130 Very Low Cover Grasslands 11-22.9 4-11.9 3140 Low Cover Grasslands 23-47.9 12-21.9 3160 Moderate Cover Grasslands= 48 >= 22 3170 Moderate / High Cover Grasslands
Ponderosa Pine was recoded into canopy cover classes using MNDVI values: P34R28 P35R28 Code Description --------------------------- < 90 < 75 4261 Ponderosa Pine - Low Cover 90-159.9 75-124.9 4262 Ponderosa Pine - Moderate Cover= 160 >= 125 4263 Ponderosa Pine - High Cover
Code Definition ----------------- 1100 Urban 2010 Agricultural - Dry 2020 Agricultural - Irragated 3111 Created Wheatgrass 3130 Very Low Cover Grasslands 3140 Low Cover Grasslands (3150 Low / Mod Cover Grasslands) 3160 Moderate Cover Grasslands (3150 Low / Mod Cover Grasslands) 3170 Moderate / High Cover Grasslands 3370 Low Cover Sage/Xeric Shrublands (3625 Sage/Xeric Shrublands) 3390 Mod/High Cover Sage/Xeric Shrublands (3625 Sage/Xeric Shrublands) 3610 Mesic Shrublands 3640 Horizonal Juniper 4150 Mixed Broadleaf / Cottonwood Forest 4214 Rocky Mountain Juniper 4261 Ponderosa Pine - Low Cover (4206 Ponderosa Pine) 4262 Ponderosa Pine - Moderate Cover (4206 Ponderosa Pine) 4263 Ponderosa Pine - High Cover (4206 Ponderosa Pine) 5000 Water 7300 Rock/Barren 7500 Mines / Quarries 7601 Badlands - Grass Dominated 7602 Badlands - Shrub Dominated 9800 Clouds 9900 Cloud Shadows
Code Definition ----------------- 1100 Urban 2010 Agricultural - Dry 2020 Agricultural - Irragated 3111 Created Wheatgrass 3130 Very Low Cover Grasslands 3150 Low / Moderate Cover Grasslands 3170 Moderate / High Cover Grasslands 3610 Mesic Shrublands 3625 Sagebrush / Xeric Shrublands 3640 Horizonal Juniper 4150 Mixed Broadleaf / Cottonwood Forest 4214 Rocky Mountain Juniper 4206 Ponderosa Pine 5000 Water 7300 Rock/Barren 7500 Mines / Quarries 7601 Badlands - Grass Dominated 7602 Badlands - Shrub Dominated 9800 Clouds 9900 Cloud Shadows
Code Description ------------------ 1 Sapling: 1.0" DBH to 4.9" DBH 2 Pole: 5.0" DBH to 8.9" DBH 3 Medium: 9.0" DBH to 14.9" DBH 4 Large: 15.0" DBH to 20.9"DBH
Code Description ------------------ 1 Very low cover: < 10% 2 Low cover: 10% to 24% 3 Low to moderate cover: 25% to 44% 4 Moderate to high cover: 45% to 64% 5 High cover: 65% to 100%
Code Description ------------------- 0 Flat 1 North 2 Northeast 3 East 4 Southeast 5 South 6 Southwest 7 West 8 Northwest
Code Description (Eastside SILC3 Codes in parenthesis) ------------------------------------------------------- 3111 Created Wheatgrass 3130 Very Low Cover Grasslands 3140 Low Cover Grasslands (3150 Low / Mod Cover Grasslands) 3160 Moderate Cover Grasslands (3150 Low / Mod Cover Grasslands) 3170 Moderate / High Cover Grasslands 3370 Low Cover Sage/Xeric Shrublands (3625 Sage/Xeric Shrublands) 3390 Mod/High Cover Sage/Xeric Shrublands (3625 Sage/Xeric Shrublands) 3610 Mesic Shrublands 3640 Horizontal Juniper 4150 Mixed Broadleaf / Cottonwood Forest 4214 Rocky Mountain Juniper 4261 Ponderosa Pine - Low Cover (4206 Ponderosa Pine) 4262 Ponderosa Pine - Moderate Cover (4206 Ponderosa Pine) 4263 Ponderosa Pine - High Cover (4206 Ponderosa Pine) 7300 Rock/Barren 7601 Badlands - Grass Dominated 7602 Badlands - Shrub Dominated
Code Description -------------------------- -1 Not Manually Classified 1100 Urban or Developed Lands 2010 Agricultural - Dry 2020 Agricultural - Irrigated 5000 Water 7500 Mines 9800 Cloud 9900 Cloud Shadow
Code Description ------------------ 1 Sapling: 1.0" DBH to 4.9" DBH 2 Pole: 5.0" DBH to 8.9" DBH 3 Medium: 9.0" DBH to 14.9" DBH 4 Large: 15.0" DBH to 20.9"DBH
Code Description ------------------ 1 Very low cover: < 10% 2 Low cover: 10% to 24% 3 Low to moderate cover: 25% to 44% 4 Moderate to high cover: 45% to 64% 5 High cover: 65% to 100%
Code Definition ------------------ A Agriculture G Grass N Non-Life Form Class S Shrub T Tree