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Land Cover and Soil Properties of the San Marcos Basin
Cody McCann
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Agenda
1. Study Area
2. NDVI and SAVI
3. Future Endeavors
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The Good Ol’ San Marcos Subbasin
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Raw Landsat Data
Normal Imagery: Red, Green, and Blue Composite Bands
Thermal Imagery DN: 8-bit, ranging from 0-255
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NDVI and SAVI Progress Diagram
Correct Reflectance Data
Landsat 5 TM to Landsat 7 ETM+
Calculate the Radiance from Landsat 7
RadianceConversion Reflectance
Convert the Radiance into Reflectance
Correction
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NDVI
NDVIValue
High : 1
Low : 0.172294
±
0 20 40 60 8010Miles
Doesn't really tell us much . . .
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Why SAVI?
Soil-Adjusted Vegetation Index
Best used when:
• Low Vegetative Cover• Different Soil Types
Modification of NDVI
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SAVI of the Subbasin
±0 20 40 60 8010
Miles
Much Better!SAVIValue
High : 0.220689
Low : 0
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Direct Relation to Water
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Direct Relation to Water
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Relation to the Edwards Aquifer
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Relation to the Edwards Aquifer
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Future Endeavors
• Soil Brightness
• Soil and Land Cover
• Soil and Stream Network
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Questions?
Thanks!
Dr. Maidment and Dr. Kilic