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Rule-based classification of high-resolution imagery over urban areas in New York City |
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| Authors: | Sunil Bhaskaran Eric Nez Karolyn Jimenez Sanjiv K Bhatia |
| Institution: | 1. Department of Chemistry and Chemical Technology , Bronx Community College of the City University of New York , Bronx , NY , 10453 , USA Sunil.Bhaskaran@bcc.cuny.edu;3. Department of Chemistry and Chemical Technology , Bronx Community College of the City University of New York , Bronx , NY , 10453 , USA;4. Department of Mathematics &5. Computer Science , University of Missouri – St. Louis , St. Louis , MO , 63121 , USA |
| Abstract: | This paper describes the integration of results from different feature extraction algorithms using spectral and spatial attributes to detect specific urban features. Methodology includes segmentation of IKONOS data, computing attributes for creating image objects and classifying the objects with fuzzy logic and rule-based algorithms. Previous research reported low class accuracies for two specific classes – dark and grey roofs. A modified per-field approach was employed to extract urban features. New rule-sets were used on image objects having similar or near-similar spectral and spatial characteristics. Different algorithms using spectral and spatial attributes were developed to extract specific urban features from a time-series of Multi-Spectral Scanner (MSS) (4 m × 4 m) IKONOS data. The modified approach resulted in a remarkable improvement in the accuracy of classes that registered low spectral seperability and therefore low accuracy. The spectral and spatial based classification model may be useful in mapping heterogeneous and spectrally similar urban features. |
| Keywords: | feature extraction urban features automated algorithms IKONOS data New York-New Jersey |