The indicator is based on the method of Effective Mesh Size (meff, Jaeger 2000). The effective mesh size (meff) can be interpreted as the area that is accessible when starting a movement at a randomly chosen point inside a landscape without encountering a physical barrier (hereafter a Fragmentation Geometry). Meffexpresses the probability that any two points chosen randomly in an area are connected; that is, not separated by Fragmentation Geometries (FGs) such as transport routes or built-up areas. Hence Meff is a measure of landscape connectivity, i.e. the degree to which movements between different parts of the landscape is possible. Meff is measured as an area (km2), within 1km2cell size regular grid as reporting units. Please note that the size of the reporting unit does not have an effect on the indicator. For a detailed methodology, please consult the indicator fact sheet.