TECHNIQUE FOR DETERMINING BRIGHTNESS AND 
SPATIAL-FREQUENCY CHARACTERISTICS OF 
TERRAIN FROM AEROSPACE SURVEY MATERIALS 
Dr. L.M.Matiyasevich 
T.I.Mikheikina 
B.V.Svechnikov 
State Scientific-Research, and Production 
Centre "PRIRODA" of Main Administration of 
Geodesy and Cartography of the USSR. 
Krzhizhanovskogo, 14» korpus 2, 117801, 
Moscow, V-218, GSP-7, USSR 
The aerospace photo pictures contain information on both 
geometrical and energy (optical) characteristics of terrain. 
However, unlike measurements of geometrical characteris 
tics, measurements of energy characteristics of terrain ele 
ments have not until recently found wide application. At pre 
sent, due to development of space techniques for surveying 
the Earth surface the latter measurements have considerably 
grown in importance. The knowledge of optical properties of 
terrain is necessary for supporting the expediency of costly 
space surveys, optimizing their application modes and develop 
ing quantitative (instrument and machine-assisted.) picture de 
coding techniques. 
The present paper is devoted to the basic concept and 
major processes used in the technique for determining optical 
characteristics of the terrain objects from the material of 
the aerospace surveys. 
Photographic photometry technique 
The process of photometric measurements from the materials 
of aerospace survey is illustrated on the schematic diagram 
shorn in Fig. 1.