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The aim of this pilot project is to establish a best-guess high-resolution DTM at the street level, suitable for very high resolution flood risk modelling. To create this we will enable a fusion of OpenStreetMap (OSM) buildings, 30 m-resolution elevation data from the Shuttle Radar Topography Mission (SRTM, or any other available satellite-based DTM), and local knowledge on the elevation of local building types around the flood-prone neighbourhoods. During the project we extended the scope to roads and drainage elements. Heights of these elements as established within OSM are collected in an inventory from local knowledgeable stakeholders using a participatory approach. The knowledge on heights of features is used with the OSM data and global terrain data using a pilot software routine developed in this project that corrects SRTM for the locally-established building heights. The resulting DTM is resampled to high-resolution so that buildings and other features from OSM can be reintroduced in the DTM as real elevated (or lowered) features. The outcome is then a highly realistic high-resolution, local DTM that shows building thresholds, streets with sidewalks, and drainage elements.
