10/14/2023 0 Comments Earth satellite mapJapanese mapping researcher Hidenori Watanave‘s newest collaborative mapping project documents damage and destruction caused by Russia's ongoing invasion of Ukraine. Image provided by Hidenori Watanave, used with permission. If budget is a constraint in purchasing high resolution satellite imagery, then one could consider utilizing free Google earth images as proposed in the present study for urban related applications.The ‘ Satellite Images Map of Ukraine Project‘ presents of images of war damage in Ukraine, such as evidence of fire visible in the windows of a destroyed building. Use of Google earth imagery in urban change detection analysis was also explored by utilizing the images of 20. The percentage split of all the four landuse classes were 60.69, 31.21, 7.83 and 0.26 for open land, built-up, agricultural and water bodies respectively. Next to open land, built-up area occupies an area of 28.83 sq.km. It was found that the area occupied by open land is 56.07 sq.km, which is the highest when compared to other landuse classes. The area of various landuse classes was found using the prepared landuse map and zone-wise/ward-wise analysis was also performed. They were then mosaicked and clipped to facilitate onscreen digitizing using GIS software. The present study is an attempt in this direction, in which 340 individual tiles of Google earth images covering Vellore in Tamilnadu were extracted using Elshayal Smart open source software. and hence can be best utilized for urban related applications. An alternative solution is to utilize Google earth imagery which is open source and provides clear view of buildings, roads, etc. To overcome this, one has to buy latest high resolution satellite image which is more expensive to purchase and sometimes it may not be possible to get the data due to security reasons. The images are of lower or medium resolution type and in many cases it may not be possible to obtain the latest image. The free satellite imagery provided in global landcover facility (GLCF) which can be used to prepare the landuse maps as attempted in many studies has certain limitations. The fundamental data required by urban planners and policy makers is accurate information on current landuse practices in a city or town and how it changes over the past for carrying out various urban planning and management activities.
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