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Normalized Difference Vegetation Index (NDVI) and False Color Composite Image for the SGP99 Region Derived from Landsat Thematic Mapper


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Overview
The Data
Background
Specifications
The Files
File Names and Format Information
Data Access and Contacts
FTP Site
Points of Contact
NDVI Data Vegetation page

Overview

The Normalized Difference Vegetation Index (NDVI) is widely used in a variety of biospheric and hydrologic studies. For instance the NDVI plays an important role in the soil moisture mapping conducted in SGP 99.

NDVI standard products are readily available from several sources. These are all based upon data collected by the NOAA AVHRR instrument. There are a variety of products with varying temporal and spatial resolutions (http://nndc.noaa.gov/onlinestore.html). Ten day and longer interval products are generated in order to have cloud free coverage. The maximum resolution of the AVHRR products is 1 km however, much of the archived data is at a coarser resolution (8 km).

As part of SGP99, a Landsat 5 Thematic Mapper (TM) scene from July 15, 1999 was acquired. This was used to produce a high resolution (30 m) NDVI data set. Users should recognize that it represents a single point in time on one day of the SGP99 experiment.

The same July 15 image was used to produce a three band (2,3, and 4) false color composite image which also useful in site analysis.

The Data

Background

  1. As part of SGP99, a Landsat 5 TM scene from July 15, 1999 was acquired.
  2. The July 15, 1999 scene was used to produce a high-resolution (30 m) NDVI data set.
  3. The original TM image was georegistered but no radiometric corrections were made.
  4. NDVI was computed for each pixel using the following equation:

  5. NDVI = (Band 4 - Band 3)/(Band 3 + Band 4)

    where:

    Band 3 - Red - 0.63-0.69 : m

    Band 4 - Near-Infrared - 0.76-0.90 : m

  6. Values of NDVI will range from -1 to +1 and vegetated areas will typically have values greater than zero.

Specifications

The data product produced here is 8 bit binary. In order to maximize the dynamic range the following scaling was performed

Scaled NDVI = 100(NDVI + 1)


The geographic description of the data set is as follows:

Data type

8 bit binary

Projection

UTM

Datum

NAD27

Ellipsoid

Clark 1866

Zone

14 S

Units

meters

No of pixels

8559

No of lines

12359

X min

456000.000 E

X max

712770.000 E

Y min

3724830.000 N

Y max

4095600.000 N

Pixel Size

30.000 E 30.000 N



The Files



File Names and Format Information

File name File type Format Description File size Storage required

 

NDVI99.bil

 

Binary

Layout BIL

NROWS 12359

NCOLS 8559

NBANDS 1

NBITS 8

NDVI for the SGP99 study area

 

~105.8 MB

 

 

 

 

 

 

 

~136 MB

 

 

 

 

NDVI99.gif

Image

Gif

Giffile displaying the binary file

~ 66 KB

FCC.gif

Binary

256 indexed color

Gif file

NROWS 12359

NCOLS 8559

False Color Composite Image for the SGP99 study area

 

~30.5 MB

FCCsm.gif

Image

Gif

Gif file displaying the binary file

~ 68 KB

Data Access and Contacts

FTP Site

The Land Cover Classification data set from SGP99 resides on DAAC anonymous FTP. You may access it from this document,

FTP iconNDVI Data and Images
or directly via FTP at

ftp disc.gsfc.nasa.gov
login: anonymous
password: < your internet address >
cd /data/sgp99/LandCover/

Points of Contact

The Principal Investigator for the SGP99 Land Cover Classification data is

Thomas J. Jackson
USDA ARS Hydrology Lab
Bldg. 007, Rm. 104, BARC-West
Beltsville, MD 20705
tjackson@hydrolab.arsusda.gov
301-504-8511 (voice)

For information about or assistance in using SGP99 DAAC data, contact

Hydrology Data Support Team
EOS Distributed Active Archive Center (DAAC)
Code 610.2
NASA Goddard Space Flight Center
Greenbelt, Maryland 20771
hydrology-disc@listserv.gsfc.nasa.gov
301-614-5165 (voice)
301-614-5268 (fax)

Last updated: January 14, 2008 15:24:08 GMT
Page Author: Hydrology Data Support Team -- hydrology-disc@listserv.gsfc.nasa.gov
Web Curator: -- Website Curator: Anthony Drake
NASA official: Steve Kempler, GES DISC Manager -- Steven.J.Kempler@nasa.gov