System uses pattern recognition and interactive data handling techniques applied to remotely sensed data. Basic analysis concept consists of locating data points which are believed to be representative of classes of interest

Landgrebe, D. A.

English

NASA Technical Reports Server

October 1975 
•	 NASA TECH BRIEF 
Lyndon B. Johnson Space Center
B75-10235 
A 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Muitispectral Data Analysis: LARSYS III 
The problem: 
Multispectral remote-sensing systems require the 
handling and interpretation of large quantities of 
data. 
The solution: 
A multispectral data analysis system (LARSYS III) 
has been developed which uses machine-processing 
techniques for the application of remote sensing. 
How it's done: 
The LARSYS III system uses pattern recognition 
and interactive data-handling techniques applied to 
remotely-sensed multispectral and/or multitemporal 
data. The primary input data to LARSYS are multi-
spectral data in image orientation. Such data are 
obtained from aircraft or spacecraft multispectral 
scanners. These images of the Earth's surface are 
either recorded in or converted to digital data for 
input to LARSYS III. 
The basic analysis concept of LARSYS III consists 
of locating data points which are believed to be 
representative of classes of interest. A class of interest 
may be certain crops, beaches, woods, and geological 
features. Gaussian statistics of these data points are 
calculated, and data sets are classified by spectral
similarity. Next, the classification results are evalu-
ated. Thus, there are four basic concepts to the 
analysis: (1) the location of data points, (2) statistical 
calculations, (3) classification, and (4) process 
evaluation. 
LARSYS III has found application in the areas of 
agriculture, geology, hydrology, and geography. 
However, the system has facilitated the application of 
remote sensing for researchers in other disciplines as 
well. 
Notes: 
1. This system was developed using FORTRAN IV 
and Assembler on the IBM 360. 
Z. Inquiries concerning this program should be 
directed to: 
COSMIC 
112 Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: MSC-14823 
Source: D. A. Landgrebe of

Purdue Research Foundation

(MSC-14823) 
Categories: 03 (Physical Sciences) 
09 (Mathematics and 
Information Sciences) 
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Multispectral data analysis: LARSYS III

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