Our four volumes propose to present innovative thematic applications implemented using the open source software QGIS. These are applications that use remote sensing over continental surfaces. The four volumes detail applications of remote sensing over continental surfaces, with a first one discussing applications for agriculture. A second one presents applications for forest, a third presents applications for the continental hydrology, and finally the last volume details applications for environment and risk issues.

Nicolas Baghdadi, French Research Institute of Science and Technology for Environment and Agriculture, France.

Clément Mallet, ING, France.

Mehrez Zribi, CNRS and CESBIO, France.