ICC Programming

Sensing Human Effects on the Environment

7115.2 - Spectral feature based tea-field extraction from digital orthophoto maps

Friday, July 7
8:50 AM - 9:10 AM
Location: McKinley

The advancements in the remote sensing technologies has made it possible to extract useful tangible information from data which plays a pivotal role in various application such as management and monitoring of forests and agricultural lands. This study aimed to evaluate the effectiveness of spectral signatures for extraction of tea fields from 1:5000 scaled digital orthophotomaps obtained from Rize, a city in Turkey. First, the normalized difference vegetation index (NDVI) was derived from the input image to suppress the non-vegetation areas. NDVI values less than zero were discarded and the output image was normalized in the range 0 - 255. Individual pixels were then mapped into meaningful objects using global region growing technique. The resulting image was filtered and smoothed to reduce the impact of noise. Furthermore, geometrical constraints were applied to remove small ob-jects (less than 100 pixels) followed by morphological opening and closing operators to enhance the results. These objects served as building blocks for further analysis. Finally, for the classification stage, a range of spectral val-ues were empirically calculated and applied on candidate objects to extract tea fields. For accuracy assessment, we employed an area based similarity measurement by overlapping obtained tea field boundaries with the manu-ally digitized tea-field boundaries which were created by photogrammetric experts. The overall accuracy of the proposed method scored 89% for tea fields for 20 sample orthophotomaps. We concluded that exploiting the spec-tral signature using object based analysis is an effective technique for extraction of dominant tree species from digital orthophotomaps.

Akhtar Jamil

PhD Candidate
Yildiz Technical University

PhD candidate at Yildiz Technical University, Dept. of Geomatics Engineering. He received his MS degree from National University of Sciences and Technology, Pakistan, in the field of Digital Image Processing. He did BS(CS) from University of Karachi and remained attached with a private organization for the development of various complex softwares. After postgraduation, he joined COMSATS Institute of Information Technology, Abbottabad as Lecturer/Research and remained attached to it for three years.


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Bulent Bayram

Yildiz Technical University

Bülent Bayram is currently Professor in the Department of Geomatics, Yildiz Technical University, Istanbul-Turkey. He received his BS degree from Department of Geodesy and Photogrammetry Engineering, Black Sea Technical University, Trabzon-Turkey in 1987. He got his MS and PhD degrees from Geodesy and Photogrammetry Engineering Department of Yildiz Technical University, Istanbul-Turkey in 1990 and 1998 respectively. He worked as Research Assistant between 1991 and 2000 at Department of Geomatics, Yildiz Technical University. He worked at the same department as Assistant Professor between 2000 and 2009. He worked as Associate Professor between 2009-2014. Since then, he is currently working as Professor at the same department.


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Turgay Kucuk

Genearal Director
EMI Information Technologies Inc.

General Director of EMI EMI Information Technologies Inc.


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Dursun Zafer Seker

Istanbul Technical University

Prof.Dr. Dursun Zafer Seker has a Ph.D. in Geomatics from the Istanbul Technical University (ITU) Turkey. He was in UK, University of Newcastle upon Tyne for his postdoctoral studies. He is currently full Professor at the Istanbul Technical University, Department of Geomatics Engineering (since 2004), after being Associate Professor at the same department (1998 -2004). His expertise is on photogrammetry, remote sensing, coastal zone management, watershed management and spatial data modelling and analysis from both the theoretical and empirical viewpoint. In these fields, he has been involved into several research projects both national and international, where these projects were inter-disciplinary.


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Keith Clarke

Department of Geography, University of California, Santa Barbara

Dr. Keith C. Clarke is a research cartographer and professor with the M.A. and Ph.D. from the University of Michigan in Analytical Cartography. He is the former North American Editor of the International Journal of Geographical Information Systems and has authored about 250 book chapters, journal articles, and papers in the fields of cartography, remote sensing, and geographic information systems. He has also served on numerous National Research Council studies and the National Geographic Society's Committee on Research and Exploration. Awards include the USGS John Wesley Powell Award (2005) and the Cartography and Geographic Information Society's Distinguished Career Award (2014).


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7115.2 - Spectral feature based tea-field extraction from digital orthophoto maps


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