Natural areas

Natural areas (forests, wetlands, permanent meadows, mountain environments, etc.) are the main reservoir of terrestrial biodiversity. They are also constantly changing environments due to human action, such as agro-pastoral decline, climate change, stockpiling, industrial risks, etc. They are often poorly understood environments because they have a low human density while covering large areas. The Cassia® approach offers targeted expertise on specific management issues for the benefit of natural area managers:
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Since the 1970s, the decline in traditional silvopastoral activities has led to a major dynamic of vegetation closure. This phenomenon has spread throughout the national territory and is a major challenge for the management of most natural areas. In this example, the objective of the study was to provide a point “Zero” that would make it possible to quantitatively and qualitatively qualify the degree of closure of an environment.
To do this, land surveys were used to identify expanding woodlands and to calibrate Cassia®. Precise mapping of woody plants (trees, shrubs and bushes) made it possible to delimit the occupied areas (left) and to map the degree of closure of the environment.
The final result (right) is an operational map on a scale of 1:25,000.

Photographic credit : © IGN 2019.


Green and blue frames are a challenge for the preservation of biodiversity at landscape scale. The Cassia® approach makes it possible to map each type of environment precisely and thus spatialise Green and blue infrastructures on a very detailed scale. The opposite example shows the detection of watercourses and the associated riparian zone. This type of map then makes it possible to identify the ecological discontinuities to be restored, but also to guide urban planning so that it best respects these ecological corridors.

Photographic credit : © IGN 2019.