Instrumental surveys are necessary for topography, and they are also consistently used in architecture, in particular for buildings having a considerable historical-artistic value or a complex structure. Surveys through electronic photogrammetry give a substantial help to gather documentation on particularly interesting works, as they allow to obtain geometrically correct drawings with a photographic resolution.

This type of surveys is also particularly useful when there is a high density of information per surface unit, when there are many representation plans to gather information about, when it is difficult to gain access to the area under exam for a direct survey, and when the only available information is photographic documentation on sites that are no longer existent.

Photogrammetry is also applicable for the three-dimensional survey of items coming in any shape, and to derive spot or isoline drawings. Through photogrammetry, it is possible to carry out consecutive differentiated thematisation, and obtain from photo-plans and stereoscopic couples a graphical highlight of several technical aspects. It is also possible to effect more specific surveys exploiting heat to monitor structures, potential damages, parts that cannot be visibly surveyed, and to survey archaeological sites having a complex stratigraphy, where the recovery of the former mapping may be postponed to the survey in the field, with considerable advantages for the excavation operations.

For land surveys and for detailed cartographic maps, are provided aerial-photogrammetry processing, among which, any digital elaboration of ortho-photo maps and ortho-photo plans, this also aimed at any further application including updates and working out of cadastral maps.