Photogrammetric techniques for cadastral map renewal
Al-Ruzouq, Rami and Petya Dimitrova
Cadastral mapping in Jordan started the early thirties, about eighty years after the introducing of first land registers by the Ottoman Empire. First cadastral maps were produced in scales 1:20000 and 1:10000 and later on other scales were used such as 1:5000, and 1:2500. At that time very low precision of the initial field surveys was used to meet the user requirements, but such precision is completely unacceptable at present due to the rapid increase of the land value, as well as the user requirements and the opportunities given by the current technology. The Department of Lands and Survey in Jordan recognizes the problem of low accuracy where physical reality on the ground doesnnt match with the existing maps, this situation in no way can meet or satisfy the needs of the future development. In addition to the low precision of the original maps, the mismatch between these maps and its diversity from ground truth is due to several other reasons; First: the image registration errors which can be considered as a critical stage that largely depend on the nature of the terrain (flat, hilly,,etc.) and the validity of transformation function used in the study area. Second: the various geographic coordinate systems and the projection parameters associated with the maps in addition to the way that each projection is defined and implemented. Other factors can be summarized as: digitizing errors, scanning errors, and finally the lack of ground truth that can fairly represent the reality with high accuracy taking into consideration the cost associated with such requirement.
Event: XXIII International FIG Congress : Shaping the change
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