Required processing:
Orthorectification and mosaicking of the aerial photographs. Computer-Assisted Photo Interpretation (CAPI).
Data requirements:
Aerial photographs
Georeferenced polygons circling the fortifications or lines delineating them.
Why using remote sensors?:
Fortifications can be detected visually, or in certain cases semi-automatically, on aerial photographs. A preliminary analysis of the conflict landscape helps focus on locations where these objects are more likely to be found.