SAVI

Description

Calculates a Soil Adjusted Vegetation Index (SAVI).

Parameters

Name	Type	Caption	Length	Value range
FILE *	String	Input file name	1 - 192
FILO	String	Output file name	0 - 192
DBIC *	Integer	Input raster channel(s)	2 - 2
DBOC	Integer	Output raster channel(s)	0 - 1
MONITOR	String	Monitor mode	0 - 3	ON, OFF Default: ON

* Required parameter

Parameter descriptions

FILE

Specifies the name of the PCIDSK file that contains the satellite image channels.

FILO

Specifies the name of the PCIDSK file to receive the output SAVI images. If this parameter is not specified, it will default to FILE as the output file.

DBIC

Specifies the image channels in the input file (FILE) that contain atmospherically corrected RED and NIR sensor band reflectance images from ATCOR.

Ranges of channels or segments can be specified with negative values. For example, {1,-4,10} is internally expanded to {1,2,3,4,10}. When you are not specifying a range in this way, only 48 numbers can be specified explicitly.

DBOC

Specifies the output channels to receive the output SAVI image. If the specified output file does not yet exist, the default output channel is 1.

Ranges of channels or segments can be specified with negative values. For example, {1,-4,10} is internally expanded to {1,2,3,4,10}. When you are not specifying a range in this way, only 48 numbers can be specified explicitly.

MONITOR

The program progress can be monitored by printing the percentage of processing completed. A system parameter, MONITOR, controls this activity.

Available options are:

• ON: Turns the monitor ON (default)
• OFF: Turns the monitor OFF (recommended if running in batch or background mode)

Details

SAVI calculates the Soil Adjusted Vegetation Index(SAVI) image and stores it in the specified output file.

As input, SAVI requires atmospherically corrected RED and NIR sensor band channels created by ATCOR.

Example

Use the atmospherically corrected reflectance image corr_essen.pix (Landsat-5 TM) produced by ATCOR to create the Soil Adjusted Vegetation Index(SAVI):

EASI>file	=	'corr_essen.pix'	! input file
EASI>filo	=	'savi_essen.pix'	! output file
EASI>dbic	=	3,4	! input Red and NIR channels
EASI>dboc	=	1	! output channel

EASI>RUN SAVI

The result is Soil Adjusted Vegetation Index (SAVI) image.

Algorithm

The Atmospheric Correction component was produced by PCI using algorithms developed by DLR, German Aerospace Research Establishment. The algorithms used in the various programs of the component are based on information in the papers listed in the References section.

References

F. Lanzl and R. Richter, (DLR, German Aerospace Institute). A Fast Atmospheric Correction Algorithm For Small Swath Angle Satellite Sensors. ICO Topical Meeting on Atmospheric Volume and Surface Scattering and Propagation, Florence, Italy, August 27-30, 1991. pp. 455-458.

R. Richter, (DLR, German Aerospace Institute). Error Bounds Of A Fast Atmospheric Correction Algorithm For The Landsat Thematic Mapper And Multispectral Scanner Bands. Applied Optics 30(30):4412-4417. 1991.

R. Richter, (DLR, German Aerospace Institute). Model SENSAT: A Tool For Evaluating The System Performance Of Optical Sensors. SPIE Propagation Engineering 1312:286-297. 1990.

F.J. Ahern, P.M. Teillet, and D.G. Goodenough, (CCRS). Transformation Of Atmospheric And Solar Illumination Conditions On The CCRS Image Analysis System. 1977 Machine Processing of Remotely Sensed Data Symposium.

R. Richter, (DLR, German Aerospace Research Establishment). A Fast Atmospheric Correction Algorithm Applied To Landsat TM Images. Int. J. Remote Sensing 11(1):159-166. 1990.