ISPRS International Journal of Geo-Information, Vol 4, Iss 2, Pp 957-973 (2015) ISPRS International Journal of Geo-Information ISPRS International Journal of Geo-Information, MDPI, 2015, 4 (2), pp.957-973. ⟨10.3390/ijgi4020957⟩ Volume 4 Issue 2 Pages 957-973 ISPRS International Journal of Geo-Information, 2015, 4 (2), pp.957-973. ⟨10.3390/ijgi4020957⟩