Upkeep - LPIS specification issues
This reflection article is not intended to provide specifications, nor to change any existing specification.
The minimum mapping unit (MMU)
In LPIS terms, the minimum mapping unit at a given scale is the size (expressed in area units) below which a legend "feature" can be reasonably represented by a polygon or as individual area. Note that the legend consist of the agricultural land classes and one, combined, non-agricultural land (ineligible) class. There are currently two different mapping units in operation in IACS.
- The 2004 LPIS creation guidance allowed for an MMU on ineligible inclusions up to 0.1 ha for calculating the MEA. This provision directly applicable to all production blocks, whose exterior perimeters were expected to follow agricultural land borders. There was no MMU at production block perimeters.
- The OTSC specifications required individual accountability for all combined ineligible features larger than 0.01 ha, resulting in an area measured and area determined.
Comparing the MEA and area determined of a parcel can lead to an anomaly on the MEA, even when both measurements were correctly established according to the respective specifications. Such anomaly cases show that the MMU truly represents a LPIS "design" issue and that this MMU is an important element with a role in the update guidance.
In this LPIS update guidance, a MMU is defined based on the nature of the change. In addition, a parcel specific "maximum area error" is introduced for vindicating anomalies detected via area measurement repetitions.
Dynamics of agricultural land covers
Agricultural land changes all the time and so does the land cover that was delineated for LPIS purposes. But many observed changes represent dynamic phenomena inherent to the agricultural land cover: arable land has an annual cycle of crop and bare soil, hedges grow large for some years and are then trimmed back. Such dynamics are an essential life-cycle element of the agricultural land covers and should not affect the LPIS nor require an update.
This LPIS upkeep guidance is not intended to model such life-cycle dynamics, but to detect and process manifest changes.
MS are invited to describe and document particular dynamics that affect the appearance of the landscape and agricultural lands. The eligibilty profile is good starting point for this documentation as it holds all eligible land cover types and represents a legend for both CAPI and field identifications of these lands.
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