land cover and soil properties of the san marcos basin
Post on 23-Feb-2016
37 Views
Preview:
DESCRIPTION
TRANSCRIPT
Land Cover and Soil Properties of the San Marcos Basin
Cody McCann
Agenda
1. Study Area
2. NDVI and SAVI
3. Future Endeavors
The Good Ol’ San Marcos Subbasin
Raw Landsat Data
Normal Imagery: Red, Green, and Blue Composite Bands
Thermal Imagery DN: 8-bit, ranging from 0-255
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
NDVI
NDVIValue
High : 1
Low : 0.172294
±
0 20 40 60 8010Miles
Doesn't really tell us much . . .
Why SAVI?
Soil-Adjusted Vegetation Index
Best used when:
• Low Vegetative Cover• Different Soil Types
Modification of NDVI
SAVI of the Subbasin
±0 20 40 60 8010
Miles
Much Better!SAVIValue
High : 0.220689
Low : 0
Direct Relation to Water
Direct Relation to Water
Relation to the Edwards Aquifer
Relation to the Edwards Aquifer
Future Endeavors
• Soil Brightness
• Soil and Land Cover
• Soil and Stream Network
Questions?
Thanks!
Dr. Maidment and Dr. Kilic
top related