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MONITORING NEWLY B8UTLT-UP ARRAS IN 
CIT PT RS WITH. OBLIQUE. AIRPHOTOS USING 
A 35 — mm CAMERA 
  
  
Victor F.L. Pollé Senior Lecturer ITC-URBAN SURVEY 
  
Summary 
This paper is meant to demonstrate the possibilities of using 35-mm 
camera oblique airphotos as a source of information for urban planning. 
Monitoring newly built-up areas in cities is feasible with this type 
of airphotos, provided vertical aerial photographs and/or urban maps 
of older date are available. 
For demonstration purposes, à sample area of 1 km2 in a Middle Eastern 
city has been chosen. The time span between the existing map and the 
oblique airphotos of that area is eleven years. In this period, con- 
siderable amounts of buildings have been constructed, both on vacant 
land and on agricultural land. The total newly built-up area is 48 ha. 
A procedure is described for finding reference points on both the map 
and the oblique airphotos as a first step in the interpretation. 
Thematic maps, prepared by eleven different interpreters through up- 
dating of the existing map, are compared. Differences between these 
maps are analysed in terms of interpretation problems and errors. 
The individual maps are also compared with a standard interpretation 
and the differences are analysed both qualitatively and quantitatively. 
Introduction 
In fast growing cities, there is a constant need for updating existing 
maps. Monitoring the newly built-up areas can best be done with ver- 
tical aerial photography using 23-cm (9 inch) cameras. However, in 
developing countries it is not always possible to obtain such photo- 
graphy at reasonable cost and at the time that the information is 
needed. Experiments with 35-mm camera vertical photography from light 
airplanes are made to study the usefulness of such images. In Bandung 
(Indonesia), this is done in the framework of comprehensive kampong 
traditional housing area) improvement programmes sponsored by UNESCO. 
3 A description of the techniques can be found in an article of 
WOODCOCK (1976). 
  
(1) ITB, INSTITUTE TECHNOLOGY BANDUNG, DEPARTMENT OF ARCHITECTURE. 
Photography flown on Kodak tri-x, with Canon 35-mm camera, motor- 
drive, neg.scale 1:8000 enlarged to 18x24 cm, scale 1:1100, 60% 
overlap for stereo interpretation. Personal contact.