Remote sensing studies are often based on simplified approaches describing the photon transport in absorbing and
scattering media. The main purpose of the present paper is to show the potentiality of modeling directly the transport
phenomena by mean of linear Boltzmann equation. Some details about the solution method of the integro-differential
equation are reported with a collection of results of relevance in planetary study domain. An inverse approach based on
artificial neural network is also proposed to retrieve the optical properties of planetary surfaces and its performances are
tested in various cases.