landuse/landcover update for the attoyac bayou watershed june 16, 2011 neil boitnott castilaw...
TRANSCRIPT
Landuse/Landcover Update for the Attoyac Bayou Watershed
June 16, 2011
attoyac.tamu.edu
Neil BoitnottCastilaw Environmental Services, [email protected]
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LULC Map
Legend
Open Water
Developed (Open Space)
Developed (Low Intensity)
Developed (Medium Intensity)
Developed (High Intensity)
Barren Land
Forested Land
Pine Plantation
Mixed Forest
Near Riparian Forested Land
Rangeland
Managed Pasture
Cultivated Crops
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attoyac.tamu.edu
Methods
ArcGIS 9.3 software was utilized for LULC mapping.
Started with watershed boundary with no LULC features.
Cut features by LULC class based on 2008-2009 leaf-off aerial photography.
Final product was entire watershed with over 12,000 individual LULC features.
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attoyac.tamu.edu
Methods Cont.
Watershed Boundary With No LULC Features
Clipping LULC Features within Watershed Boundary
LULC Features Clipped from Watershed Boundary
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Accuracy AssessmentTotal Average Accuracy = 86%Accuracy by LULC Class:
Open Water – 100% Developed (Open Space) – 100% Developed (Low Intensity) – 76% Developed (Medium Intensity) – 70% Developed (High Intensity) – 100% Barren Land – 82% Forested Land – 100% Pine Plantation – 90% Mixed Forest – 67% Near Riparian Forested Land – 70% Rangeland – 100% Managed Pasture – 86% Cultivated Crops – 75%
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Accuracy Assessment Cont.
Field Assessment Methods
Upload GPS points from mapping software to mobile GPS unit.
Drive to GPS point in the field.
Record LULC type for GPS point and compare to mapped LULC.
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Accuracy Assessment Cont.
Managed Pasture Pine Plantation
Open Water Near Riparian Forested 8
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Accuracy Assessment Cont.
Office Accuracy AssessmentPrimarily Used for Developed ClassesMethods:
Using ArcGIS software, place grid over developed area in question.
Count number of grid intersections occurring over developed surfaces vs. number of grid intersection occurring over undeveloped surfaces.
Get a total percentage of developed area and classify to appropriate LULC class
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Accuracy Assessment Cont.
Developed area (Garrison) with Grid for Office Assessment.
Developed area (Garrison) Classified.
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