The correspondence between space and time, associating living spaces and risks, their scales, and specific durations is being called into question by the increasing level of natural resources consumption and surroundings contamination. The key purposes of risk assessment are prevention of future calamities, reactivity, emergency management, and finally – decision making and landscape planning implementation.
The basement for risk assessment are methods, stages, and GIS facility that includes: reliable data gathering (optical or multispectral types of remotely sensed data for emergency situation monitoring), collection and visualization in different bands combinations, and analysis:
NASA Giovanni platform and different types of data processing such as Time Overage Map, correlation, time series, etc.;
EO Browser and exact satellite images (Sentinel, Landsat) with custom script visualization for such hazards assessment as volcano eruptions with difficult weather conditions, wildfire, floods and droughts, algae bloom, bark beetles invasion, oil spills, gases and pollutants concentration, temperature bands and NDVI visualization, etc.;
Google Earth Engine for time period analysis and focusing on surface water changes;
QGIS extensions for thematic data processing and advanced spatial analysis: Remote sensing change detection, Visualization in different bands combinations, Histogram building and enhancement, trend estimation; Satellite image time series and timelapse building; Normalized indices (NDVI, NDMI, NDWI, Burn Area Index, NBR, mNDII, FMI) calculation; 3D model visualization; Classifications and division into corresponding classes; Thematic processing; Digital maps building; Environmental troubleshooting and Reports. Its results allow us to confront ephemeral and permanent, temporal and timeless, unique and repetition phenomenon, their rapidity, and slowness, mobility and immobility, revolution and stagnation, stability and instability, spatial and temporal scales, etc.
Mots clés : remote sensing|methods|risk assessment|landscape planning|implementation
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