Published in Scientific Papers. Series "Journal of Young Scientist", Vol. 6
Written by Andreea Luminiţa DEDULESCU, Valentina Mihaela BULIBAŞA
Mapping has had an essential role in history, bycapturing and transmitting models and visions of nature and social relationships. The emergence of the first maps was related to the need for orientation of the first humans and the need to delimit hunting and cultivated areas. The first aerial photographacquired from a balloon above Paris, brought a great evolution of the knowledge of the territory. We now have various images captured by a multitude of satellites, providing valuable Earth observation information. This study focuses on the Sighisoara area in order to create a geodatabase, containing maps and pictures from 1918 to the present. We used Sentinel 1, Sentinel 2 imagesfrom Copernicus Open Access Hub platform, and Landsat 8 images from Earth Explorer platform, free of charge. Image processing is made with SNAP (Sentinel Application Platform) software available for free;for Sentinel 1 images we applied a noise reduction filter, a geometric correction (geocoding based on a digital elevation model) and then cropping of the image. The Sentinel 2 and Landsat 8 optical images were used to create natural color image red-green-blue combinations of spectral bands, which were initially resampled and cropped. All the products obtained have been integrated into a geodatabase using the QGISprogram, also available for free, all data being kept for future use.
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