Abstract
Abstract. Accelerated urban growth has affected many of the planet's natural processes. In cities, most of the surface is covered with asphalt and cement, which has changed the water and air cycles. To restore the balance of urban ecosystems, cities must find the means to create green spaces in an increasingly gray world. Green spaces provide the city and its inhabitants a better living environment. This article uses Nador city as a case study area, this project consists in studying the possibility for the roofs to receive vegetation. The first axis of this project is the quantification of the current vegetation cover at ground level by calculating the Normalized Difference Vegetation Index (NDVI) based on Satellite images Landsat 8, then the classification of the LiDAR point cloud, and the generation of a digital surface model (DSM) of the urban area. This type of derived data was used as the basis for the various stages of estimating the potential plant cover at the roof level. In order to study the different possible scenarios, a set of criteria was applied, such as the minimum roof area, the inclination and the duration of the sunshine on the roof, which is calculated using the linear model of angstrom Prescott based on solar radiation. The study shows that in the most conservative scenario, 21771 suitable buildings that had to be redeveloped into green roofs, with an appropriate surface area of 369.26Ha allowing a 63,40% increase in the city's green space by compared to the current state contributing to the improvement of the quality of life and urban comfort. The average budget for the installation of green roofs in a building with a surface area of 100 m2 varies between 60000dh and 170000dh depending on the type of green roofs used, extensive or intensive. These results would enable planners and researchers in green architecture sciences to carry out more detailed planning analyzes.
Highlights
Cities are the main habitat for more than half of the world's population (UN-WUP, 2011; Girardet, 1996), and this figure is expected to reach 60% by 2030 (Decker et al, 2000) and 70-80 % by 2050 (UNEP, 2013)
In Morocco, the environmental strategy is at the heart of public policies aimed at protecting the environment by contributing to the growth and promotion of green spaces in urban areas and reducing greenhouse gas emissions at the origin of global warming confirmed at the 22nd edition of the Conference of the Parties (COP 22) in Marrakech
The data from the laser LiDAR is validated by calculating the trajectory according to the position given by the GPS system and the inertial navigation system (INS), which measures roll, pitch and heading of the LiDAR system, for dense sampling of the Earth's surface, and produces accurate x, y, z measurements which varies from 8 to 20 cm in Z and 5 to 55 cm in XY which depends on the Lidar system used ALS 70HA of Leica geosystem
Summary
Cities are the main habitat for more than half of the world's population (UN-WUP, 2011; Girardet, 1996), and this figure is expected to reach 60% by 2030 (Decker et al, 2000) and 70-80 % by 2050 (UNEP, 2013). Nature has rarely been taken into account as a primordial factor of the urban form, generating in a set of artificial landscapes, in which nature is rarely respected, cities have evolved in such a way that they have less and less space green per capita. In an increasingly urbanized world, cities must be part of the global problem-solving process and face the challenges of sustainability (Grimm et al, 2008; Girardet, 1996). In Morocco, the environmental strategy is at the heart of public policies aimed at protecting the environment by contributing to the growth and promotion of green spaces in urban areas and reducing greenhouse gas emissions at the origin of global warming confirmed at the 22nd edition of the Conference of the Parties (COP 22) in Marrakech
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
