In the applied perspective restitution procedures, it is possible to use images captured by a large variety of analog (film) and digital cameras as well as video-cameras - at almost any heights i.e. their distances to the targeted objects, using platforms, tripods, balloons, airplanes or satellites (for additional information please refer to the appropriate pages of this web-site).

 

With regard to that, there is a possible two types of images to be restituted: 

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     - Areal/aerial images with an object-to-camera distances/heights of more than 300 m (in larger-formats e.g., 9inch×9inch - approximately                         23cmx23cm), which are usually captured using either vertical or horizontal nadir shooting directions (perpendicular to the targeted surface), and 

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     - Ground-based (close-range) images with an object-to-camera distances/heights of less than 300 m (in smaller-formats), captured using not only           vertical or horizontal but “mixed” shooting directions that are either nadir or oblique ones. 

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Value of 300m represents the minimum safe flying height above populated areas in the case when shooting is from the airplane.

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Projects based on perspective restitution procedures applied on “classic” (ground-based/close-range) images, can be placed into following categories:

 

     - Small (simple) projects, and 
     - Large (complex) projects.

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“Small” projects are those for which the area of interest is equivalent to about 5 m2 or smaller. This type of projects may also be referred to as “extreme close-range” ones, in the case when high precision of restitution is expected. 

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“Large” projects are those for which the area of interest is greater than 5 m2 or where complexities of targeted objects or access to them add to the level of expertise needed for planning and execution of the project. Projects that fall into this category may require a preliminary site visit or detailed analysis of previously taken overview images (“informative” ones).