Document Type : Research Paper

Authors

• zohreh salehinezhad ¹
• mohammadmehdi mohammadipoor ²
• seyed ali almodaresi ³

¹ Employee

² employee

³ Member of the academic staff of Azad University, Yazd branch

Abstract

Illegal construction is one of the major challenges in urban development.Most of the illegal construction in large cities of Iran is related to height and construction violations, building permits, and commercial uses. Common methods for controlling construction are time-consuming and costly.Therefore, the main goal of this study is to provide a framework for rapid and low-cost estimation in monitoring and detecting unauthorized buildings and height violations in the ImamShahr area of ​​Yazd due to population density,construction, and high potential for migration,using a combination of Sentinel 1 and Sentinel 2 radar satellite images in the period 2015 to 2020.For this purpose, after geometric and radiometric corrections, the images were first grouped together using the SNAP and ENVI software to separate and differentiate buildings based on height, using texture features including mean,variance, and dissimilarity inVV and VH polarizations, and then extracted using the artificial neural network classification method,urban impervious surfaces, and building heights, and using optical images to identify building shadows.The results of the processing,the average kappa coefficient and overall accuracy of Sentinel-1 images withVV polarization were 77.16and 79.5percent, and inVH polarization were79.16and 80.66percent, and for the neural network classification map of Sentinel-2 images, 66.73 and 66.75 percent;The number and area of ​​unauthorized constructions also showed that in 2015, the study area had the highest amount of unauthorized construction compared to other study years due to the weakness of the building police field inspection, the legal vacuum in dealing with violators, and the manner of handling or factors of the violation(municipality, citizen).

Keywords

• Sentinel 1 radar images
• Sentinel 2 optical images
• illegal buildings
• radar interferometric method
• Imamshahr region of Yazd

Main Subjects

• Urban and Regional Development Planning