Chapter 12 — Question 1

Compare digital image classification with visual image interpretation in terms of input

of the operator/photo-interpreter and in terms of output.

Answer

Visual image interpretation

Digital image classification

Input

fieldwork information

bands (feature space)

bands (colour composite)

training samples (fieldwork)

interpretation elements

classification algorithm

interpretation keys

threshold for the unknown class
definition

class definitions and hierarchy

in case of unsupervised classifica-
tion, only bands (feature space)

Output

identified objects and features

thematic layer of land cover clas-
ses

(hopefully) features’ functions

error matrix for assessment

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