ACCURACY AND QUALITY CONTROL OF THE PHOTOGRAMMETRIC DIGITAL MAP PRODUCTION OF ISTANBUL 
ORUKLU, H.Erdoÿan. Prof. Dr. 
ALKIS, Ayhan. Prof. Dr. 
GÜMÜSAY, Ümit. Asst. 
AKÇALI, Timur. Asst. 
(Staff Members of Geodetic and Photogrammetric Engineering Department 
of Engineering Faculty of Yildiz University - Istanbul / TURKEY ) 
ISPRS Commission No : IV 
KEYWORDS : Accuarcy, Data quality, Digital systems, Mapping, Photogrammetry 
ABSTRACT : 
In this paper, the accuracy and the quality control of Photogrametric Digital Map Productuon of Istanbul 
will be explained. The scales of the produced maps are, 1/500 and 1/1000. During the control period, 
modern analytical plotters, workstations, total stations and other related instruments had been used. 
From the beginning till the end, control process succeded each production step. No source of error was 
found to be a bottleneck in the production lines. Results which are very satisfactory can be seen as 
follows. 
1. INTRODUCTION 2. CONTROL PROCESS 
Istanbul is a unique city located on two The supervision of this project had been carried 
continents, Europe and Asia, with a population of out by the staff members of Geodetic and 
10 millions and covering an area of 940 sq. km. Photogrammetric Engineering Department of 
In July 1987, Metropolitan Municipality of Engineering Faculty of Yildiz University-lSTANBUL. 
Istanbul decided to have uniform (base) maps of Control Process was initiated with the 
Istanbul with scales of 1/500 and 1/1000 establishment of ground control points. For 
produced, /3/. Control process had started from convenience in block adjusment of aerial 
the beginning of the project. triangulation, whole area was divided into 21 
blocks as in figure 1., below: 
  
        
   
Black Sea 
EUROPE 
v.u........ 
Marmara Sea 
  
  
  
Figure 1: Project Area and Blocks for Istanbul 
Photogrammetric Digital Maps. 
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