Permanent boundaries must be taken into consideration, in decreasing order of
stability grade as outlined above, until the physical block meets the criteria of the
average area and a maximum number of agricultural parcels.
Physical blocks must be created in such a way to ensure that eligible areas are not
excluded (i.e., nonagricultural blocks should be checked to make sure they do not
contain any potentially agricultural areas) (Parcel Identification System Creation
and/or Updating 2005).
Physical block boundaries should not intersect agricultural parcels.
The minimum size of agricultural physical blocks is 0.1 ha.
The minimum width of a polygon is 2 m.
All ineligible areas greater than 0.1 ha (1000 m2 or 1 da) within an agricultural
block will be extracted (i.e., delineated), except if their minimum dimension is less
than 2 m for linear features.
Paths crossing agricultural land should be excluded if their width is greater than
2 m unless they are made by animals or are necessary for access to agricultural areas.
Linear elements must be digitized according to their exact boundaries if the
boundaries are recognizable from the orthophoto and their width is greater than
2 m. Elements less than or equal to 2 m in width should be digitized with a single line
along the axis of the feature.
The maximum acceptable deviation between the digitized line and the real course
of the boundary, where this can be reliably determined from the orthophoto, is 1 m.
During digitization, the scale must be fixed at 1:2000, and all polygon boundaries
must be digitized at this scale wherever possible. In exceptional cases (i.e., for very
small objects), other scales can be used, but these must be between 1:500 and
1:2000.
The density/position of polygon vertices must ensure a correct geometrical shape
is obtained (within the limits of the orthophoto resolution).
Two points can only be connected by one straight line, and the minimum distance
between two points is 1 m.
Overlaps (crossings) between polygons or gaps between polygons are not
allowed, and multipart polygons are not allowed (holes in polygons are allowed).
Following the above criteria, the Turkish LPIS legend was developed
(Fig. 13.11).
This kind of classification comes from the United Nations Food and Agriculture
Organization (FAO) Land Cover Classification System (LCCS). All EU member
states use the same system, and Turkey is also harmonized with the system.
13.3.4.2 Controls
Digitization controls were carried out using the AT blocks mentioned in the previous
sections in ISO 2859: sampling procedures for inspection by attributes (https://www.
iso.org/standard/39991.html) and ISO 19157: geographic information-data quality
(https://www.iso.org/standard/32575.html) standards.
These checks include:
13 Spatial Data Usage in Turkish Agriculture
255
stability grade as outlined above, until the physical block meets the criteria of the
average area and a maximum number of agricultural parcels.
Physical blocks must be created in such a way to ensure that eligible areas are not
excluded (i.e., nonagricultural blocks should be checked to make sure they do not
contain any potentially agricultural areas) (Parcel Identification System Creation
and/or Updating 2005).
Physical block boundaries should not intersect agricultural parcels.
The minimum size of agricultural physical blocks is 0.1 ha.
The minimum width of a polygon is 2 m.
All ineligible areas greater than 0.1 ha (1000 m2 or 1 da) within an agricultural
block will be extracted (i.e., delineated), except if their minimum dimension is less
than 2 m for linear features.
Paths crossing agricultural land should be excluded if their width is greater than
2 m unless they are made by animals or are necessary for access to agricultural areas.
Linear elements must be digitized according to their exact boundaries if the
boundaries are recognizable from the orthophoto and their width is greater than
2 m. Elements less than or equal to 2 m in width should be digitized with a single line
along the axis of the feature.
The maximum acceptable deviation between the digitized line and the real course
of the boundary, where this can be reliably determined from the orthophoto, is 1 m.
During digitization, the scale must be fixed at 1:2000, and all polygon boundaries
must be digitized at this scale wherever possible. In exceptional cases (i.e., for very
small objects), other scales can be used, but these must be between 1:500 and
1:2000.
The density/position of polygon vertices must ensure a correct geometrical shape
is obtained (within the limits of the orthophoto resolution).
Two points can only be connected by one straight line, and the minimum distance
between two points is 1 m.
Overlaps (crossings) between polygons or gaps between polygons are not
allowed, and multipart polygons are not allowed (holes in polygons are allowed).
Following the above criteria, the Turkish LPIS legend was developed
(Fig. 13.11).
This kind of classification comes from the United Nations Food and Agriculture
Organization (FAO) Land Cover Classification System (LCCS). All EU member
states use the same system, and Turkey is also harmonized with the system.
13.3.4.2 Controls
Digitization controls were carried out using the AT blocks mentioned in the previous
sections in ISO 2859: sampling procedures for inspection by attributes (https://www.
iso.org/standard/39991.html) and ISO 19157: geographic information-data quality
(https://www.iso.org/standard/32575.html) standards.
These checks include:
13 Spatial Data Usage in Turkish Agriculture
255