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Summary of Proposal LAN0350

TitleMapping urban structure for natural hazards in Santiago de Chile
Investigator Banzhaf, Ellen - UFZ- Helmholtz Centre for Environmental Research, Urban Ecology, Environmental Planning and Transport
Team Member
Dipl.Geogr. Ebert, Annemarie - UFZ- Helmholtz Centre for Environmental Research, Urban Ecology, Environmental Planning and Transport
Dr. Banzhaf, Ellen - UFZ- Helmholtz Centre for Environmental Research, Urban Ecology, Environmental Planning and Transport
Dr. Parolai, Stefano - GFZ - GeoForschungsZentrum Potsdam, Section 2.1 - Earthquake Risk and Early Warning
Summary - Terra SAR - X data will be integrated into a set of remote sensing data from optical sensors to improve the results - Delineation of urban structure types Land use/land cover classifications have to be performed for the entire city, not only to be used as input for risk assessment, but also for the further application in urban planning and research in urban development. The main focus hereby is laid on the identification of urban built-up areas, open spaces and vegetation coverage in order to delineate urban structure types and spatial metrics. Urban structure types and spatial metrics are valuable tools to describe settlements and to monitor urban development over time. Images taken in the Stripmap Mode that are at the same time used for hazard analysis cover an area large enough with an appropriate spatial resolution for urban applications. The use of multi-temporal data could yield important details on seasonal changes in urban land use and land cover, but also changes in the terrain. Geomorphological structures, vegetation and urban green spaces, are key factors in modelling, hazard analysis and ecosystem characterization. Another example is urban sprawl with its dynamic development. physical risks The city of Santiago is prone to flood, earthquake, and landslide hazards. For the assessment of these hazards and risks, detailed information about the natural and urban environment along the river is necessary. Particularly, knowledge about rocks and sediment structures, riverbed morphology, vegetation and the extent of the river at different times of the year are fundamental information for hazard analysis. In order to calculate the flood hazard it is important to involve the seasonal changes in the ecosystem river in the modelling process. Especially during winter, when the water level rises and when clouds and rainfall add to the permanently limited visibility, x-band data can still successfully be obtained. TerraSAR-X data covering large parts of the river that are taken in the Stripmap Mode at different times of the year would be beneficial for this part of the analysis. e.g. December: summer, vegetation fully green, little water in river June: winter, high water levels in river, winter vegetation March and September: transition stages in water level and vegetation expected Also, an inventory of physical structures as well as information about land use and land cover are needed to complete risk assessment. The identification and characterization of built-up areas, flood barriers and transport infrastructure, including best possible estimations of building outlines and height, are important input data for seismic and hydraulic models. TerraSAR-X images with high azimuth resolution, taken in the Spotlight Mode that cover the areas along Río Mapocho, have very high potential to provide the information needed, especially because also a high resolution digital terrain model can be delineated. In terms of polarization it would be useful to obtain data with single polarization (VV polarization) in order to benefit from the high spatial resolution of 1 m. Furthermore, a digital elevation model is beneficial. Information about elevation and slopes can be used to delineate flood as well as landslide hazard zones. Slope data in combination with information on land cover and land use form the information base for landslide hazard assessment. Using interferometry, the detection of mass movements becomes possible. TerraSAR-X data can also be used for the assessment of earthquake hazards in terms of fault detection and surface movements using interferometry. Thus, the project aims at the assessment of various co-occurring physical hazards in a metropolitan region.

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