Solutions - Flood Analysis

Flood Analysis

The new EU Floods Directive¹ requires that before 2015, all member countries map the areas that are at risk of flood in case of sea level rising, rivers flooding, or heavy rain falls. The directive instructs countries to produce flood risk maps and to take adequate measures to reduce the risk of flood damage for human safety, environment, infrastructure and property.² This requires accurate elevation models of these areas in order to determine which zones are prone to flood at which water level. Airborne LiDAR is the natural choice of method to capture data from large areas and to generate an accurate terrain mode. A mobile scanning system mounted on a boat has also been tested for scanning the river banks and nearby areas.

Case study Finland

The Finnish National Land Survey (NLS) started gathering elevation data by airborne LiDAR in spring 2008. The main goal of the capaign is to improve the accuracy of the national elevation model and thus, to fulfill the new EU Floods Directive on the "Assessment and Management of Flood Risks". The scanning is done from an altitude of about 2000 m, resulting in a minimum point density of 0.5 points per square meter. The new national DTM derived from the data will be utilized for many applications among which mapping of flood risk areas has one of the highest priorities.³

More information

¹ A new EU Floods Directive
² Implementing of the Floods Directive
³ NLS of Finland - Laser scanning data


DTM of 2 m resolution


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Last update on this website: 24.11.2020
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