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LAND USE CHANGE DETECTION AND WATER QUALITY MANAGEMENT IN 
ISTANBUL’S WATER BASINS BY USING IKONOS IMAGERY 
C.Baspehlivan * *, Ó.V.Sarikaya ", 
A.Karaburun? ,M.F.Dóker * 
? Istanbul Metropolitan Municipality, ISKI General Directorate, Planning & Project Head Office, Aksaray, Istanbul, 
Turkey- (cbaspehlivan, osarikaya)@iski.gov.tr, 
? ISLEM GIS, Istanbul Regional Office,Barbaros Cd. No:42/4 Besiktas, Istanbul, Turkey-(akaraburun@islem.com.tr) 
© Istanbul University Institute of Social Science, Beyazit, Istanbul, Turkey-(fdoker@yahoo.com) 
KEY WORDS: IKONOS , Project, DEM/DTM ,Mosaic ‚Urban , 
ABSTRACT: 
Building , Classification, Database 
The aim of the study is producing 1/5000 scaled ortho- images by orthorectifying the monoscopic IKONOS images in the duty arca 
of the Istanbul Water and Sewage Administration(7500 km^ area),change detection within the catchment areas protection boundries 
between 1996-2003 using the previous orthophotos (that are produced with photogrammetric methods) and ortho-images,producing 
ortho-images using Stereo IKONOS imagery in a 250km? area that has no DEM and collecting information about the hydrodynamic 
structure of the B.Cekmece lake by classifying the 1 m resolutioned IKONOS image and using the real-time field data(field data 
gathered at the same time of the IKONOS image acquisition).ISKI will take images of the catchment areas, which includes a 5990 
km? area, 4 times a year(March-June-September-December) in order to determine structural change and to protect these areas.The 
aim is to digitize the structural changes and to transfer these to a database created for catchment areas in order to supply the up to 
date data flow for a dynamic catchment area information system. 
1. INTRODUCTION 
The aim of the study is producing ortho-images by 
orthorectifying the monoscopic IKONOS imagery inside the 
duty area of Istanbul Water and Sewage Administration(7500 
km?),in order to determine the change within the catchment 
areas protection boundries.IKONOS imagery will be taken 
periodically 4 times a year beginning at March 2004. 
Furthermore,a correlation is established between the near IR 
band of the IKONOS image and real-time field data(measuring 
the TSM,clearness and chlorophyll concentration at the same 
time of the image acquisition) in order to classify the water. 
For the study IKONOS RGB Geo product with Im geometric 
resolution was taken.50m grid spaced DEM with a 1/5000 scale 
precision produced with photogrammetric method,1/1000 
scaled topographic map produced with photogrammetry,1/5000 
scaled orthophoto map,DEM produced using 250m grid spaced 
elevation maps with 1/25000 scale precision and 1/25000 scaled 
raster map(RASTER-25) were used for the orthorectification 
process. 
The study can be grouped in 3 titles; 
1.1 Orthorectification 
Orthorectification and orthoikonos image production in Istanbul 
city boundry(5500km” area) with +- | m RMS, 
Orthorectification and orthoikonos image production outside 
[Istanbul city boundry(1750km? area) with +/- 5 m RMS. 
1.2. Water Quality Classification 
Determining and interpreting water quality parameters at the 
B.Cekmece catchment area that can be determined with real 
time field | measurements(Collecting data with field 
  
*Corresponding author. Tel.: +90 212-588-38-00, 1758; 
fax: +90 212-588-38-89 
E-mail address: cbaspehlivan@iski.gov.tr 
measurements at the same time of the acquisiton of the satellite) 
and IKONOS imagery. 
1.3.Monitoring structural changes 
Changes occured in the catchment areas, which are obtained by 
the July 2003 orthorectified ortho-i images and will be obtained 
periodically within a 5990km? area every 4 months (March- 
June-September-December),will be transferred to the 
Catchment Information System for supplying up to date raster 
and vector data. 
      
       
    
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8672 8673 | 8689 
8692 | 
  
5 € 
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Figurel .7500km? ISKI Study Area and IKONOS PO ID 
509