|
Products
Data Sets
Publications
Protocols
Images
Contribution Series
CAP LTER Symposia
|
|
SAVI (Soil Adjusted Vegetation Index) Image of 2000 Enhanced Landsat Thematic Mapper(ETM) Image
Identifier:237_1
Publication date:2004
Author(s):
William Stefanov
Abstract:
Soil Adjusted Vegetation Index (SAVI) produced from the 2000 Enhanced Landsat Thematic Mapper(ETM) image. SAVI is a means of monitoring density and vigour of green vegetation growth using the spectral reflectivity of solar radiation. It is computed as follows:( (NIR-RED) / (NIR+RED+L))*(1+L), where NIR (Near Infra-Red) is the ETM band 4 (0.76-0.9 micrometers), RED is band 3 (0.78-0.82 micrometers), and L is the correction factor whose values range from 0 (high vegetation cover) to 1 (low vegetation). L=0.5 was used. The index has been designed to correct for high soil reflectance in arid regions.
Keywords:
SONORAN DESERT, PHOENIX, urban, remote sensing, caplter, Central Arizona Phoenix Longterm Ecological Research, metropolitan area, Arizona, SAVI, Project id 20, Landsat ETM, caplter created, Soil Adjusted Vegetation Index, Land-Use and Land-Cover Change, Database Remote Sensing GIS Applications, Land Use Changes, gis, Primary Production
Temporal Coverage:
2000-05-21
Geographic Coverage:
Geographic Description:Central Arizona Phoenix
Bounding Coordinates:
Longitude:-112.776642 to -111.569326
Latitude:33.851503 to 33.202291
Contact:
Data Manager, Global Institute of Sustainability,
Arizona State University,PO Box 875401,Tempe
caplter.data@asu.edu
Methods used in producing this dataset:
SAVI computation
The raw Landsat image was clipped to CAPLTER, georeferenced to NAD27 datum and UTM zone 12 coordinate system. Additional preprocessing include atmospheric correction and radiometric calibration. The model of the following form is then applied: ( (NIR-RED) / (NIR+RED+L))*(1+L), where NIR (Near Infra-Red) is the ETM band 4 (0.76-0.9 micrometers), RED is band 3 (0.78-0.82 micrometers), and L is the correction factor whose values range from 0 (high vegetation cover) to 1 (low vegetation). L=0.5 was used. The range of possible values is -1 to +1.
Rescaling SAVI values
The values computed in the first step are rescaled to the range of values from 0 to 1 using Erdas Imagine rescale utility.
Entities:
Raster: ETM_5_21_00_savi
download
Attributes:
Attribute:Histogram
Description:Total number of pixels of each particular value
Measurement Unit:number
Attribute:Value
Description:Rescaled SAVI value
Measurement Unit:number
|
