UPD geometry processing

From Wikicap - European Commission

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Whenever non-conformity of the spatial attributes of one or more reference parcels has been confirmed, the geometry needs to be processed.

The processing of geometries is the core GIS function of LPIS and therefore the central activity in the LPIS upkeep process:

  • modelling real world units of agricultural land or boundaries in reference parcel feature types,
  • complying with the homogeneous standard equivalent to a cartographic scale of at least 1:5000 (although a larger scale could also be used).
  • populating and combining spatial feature types.

So for the purpose of the upkeep, where the final objective is to reliably determine an updated geometric area, it suffices to call on the several particular instructions that help meeting best practices for spatial operations. Hence, the operator should have:

  • respected the GIS best practices and interoperability guidance,
  • tested and verified suitability of all source data,
  • applied the congruency test to correct any local coordinate shift between aerial imagery and survey data on one hand and reference vectors on the other hand before a merger of surveys.

After a new geometry and geometric area has been established, he may apply the 2% stability rule to control with the difference between a measured geometric area and legacy reference area.

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