DIRECTIONAL/HIERARCHICAL TM-LANDSAT DATA SEGMENTATION 
Albano Henrique de Araüjo 
Osmar Abflio de Carvalho Jr. 
INFOSAT - Sensoriamento Remoto 
SQS, Qd. 01, Bloco B 
Ediffcio Maristela, Sala 1214 
70000-000 - Brasflia - DF 
ISPRS Commission VII / Working Group 4 
ABSTRACT 
In this paper we discuss the application of the zonation technique to TM-Landsat data segmentation. The 
use of segmentation techniques is helpful when desired information is associated with spatial distribution 
of original data. The zonation is a directional/hierarchical segmentation technique based on the averages 
and variances of two neighbour subsets, used to define the D2 parameter. D? values near zero indicate 
continuous sequences and higher values indicate proportional discontinuities. or TM-Landsat images the 
zonation technique is used like a convolution filter with D2 values being obtained for a window and 
attributed to the its center. The window subdivision in several directions is responsible for the directional 
characteristic of the tecnique and the attribution of the higher value of D2 obtained to window center 
define the hierarchical aspect. The case study in the Pirenópolis mega-Inflection (central Brasil) shows 
excellent results with the segmented data indicating the general structure of the area, compatible with the 
foliations, lineaments ad others structural field data. 
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