POSSIBLE INFLUENCE FACTORS OF TECHNICAL TOLERANCE
D. Molnár, A. Surányi, V. Grónás, J. Skutai
Legitimate users of agricultural areas can receive land-based payments based on the area of either the cultivated plants or the uncultivated land kept, in line with the provisions of community and national legislation, in condition eligible for support. Furthermore, land-based support can be received via other rural development measures as well.According to European Commission regulation the appropriate and eligible claim of the land-based supports shall be controlled by the member states. The most robust technique of this process is the remote sensing control. The observed discrepancies shall be sanctioned based on their extent and intentional nature. A measurement tolerance interval shall be set in case of remote sensing operations so that the extent of discrepancy is to be determined in the most objective way possible. As far as the measurement tolerance interval is concerned the goal is to minimise the cumulative faults appearing during the measurements (such as the scale of agricultural activities, the inaccuracy of farmers’ drawings necessary for the claiming of support and the inaccuracy of control materials and methods).The establishment of the measurement tolerance interval is based on the fact that the reference parcels selected by the validation protocol are made by several operators in iterations. As a result of this process the following conclusions can be drawn:The validation method of multi-level tests required by the Joint Research Centre (JRC) properly detects the measurement results strongly affected by faults. Although this method is to be used exclusively to determine the technical tolerance in the Control with Remote Sensing (CwRS) process of the Integrated Administration and Control System (IACS), as independent validation process it does not take the further imagery and other vector references into account. In our examination we assessed the possible inclusion of the smallest identification unit of the Land Parcel Identification System (LPIS) – i.e. the physical block – as well as its impact on the value of technical tolerance.
Keywords: technical tolerance, orthoimagery, validation, LPIS, CwRS