Cartographie des continuités écologiques : quelles données pour quelles échelles territoriales ? Application à la sous-trame forestière

Abstract

Mapping of ecological continuities, which contributes to that of the green and blue belt network, is being undertaken across the country to develop regional schemes of ecological coherence. Several layers of spatial information are currently available in national databases to perform this mapping. The use of these layers raises a number of issues regarding data quality and processing, and data relevance with regard to characteristics of the studied areas and the scales at which ecological continuities are observed. The objectives of this study were to identify the ecological continuities from these data and to determine at what spatial scales these maps can be used. For this, the available layers on the Brittany region have been identified and processed to map ecological continuities at regional, community of cities and city levels. Comparative analysis of these maps to the three scales showed significant differences, stating the advantages and disadvantages of each type of data according to the scale considered. It also highlights the fact that only wooded corridors can be mapped with the layers of spatial information available in national databases.