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Land Management & Natural
Hazards Unit |
SOIL |
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Soil
Atlas of |
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A Soil Database of
Nested soil data
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(JK) 1 : 2 500 000 Examples of nested soil dataAs explained in the previous pages, a key
element of the European Soil Information System (EUSIS) within the INSPIRE
initiative is concept of nested data. In simple terms this means that
information at different map scales or resolution for the same location can
be stored and accessed through EUSIS. One could imagine different map sheets
laying one on top of the other. The maps show soil units for the Czech
Republic at a scale of 1:2,500,000 (above) with detail around the town
of Haradec Králové at scales of 1:1,000,000 (right),
1:250,000 (facing page top) and 1:50,000 (facing page bottom). By comparing the small-scale maps on this
page with the more detailed maps on the facing page, the issue of
cartographic generalisation of reality becomes strikingly obvious. Many of
the patterns and soil types depicted on the 1:50,000 map
cannot be identified at all on the 1:250,000 map. This means that the
information collected at the base level or the largest scale must be
simplified for displaying and use at regional or European level. Procedures
must be developed to ensure that the boundaries between soil units can be
redrawn accurately at different scales and that the smaller scale soil units
are labelled or classified accurately in accordance with the information contained
in the larger scale datasets (maps). One solution is to use a grid or cells
to map the soil units at the larger scale. This grid can then be re-sized or
resampled to generate coarser resolution data based on a statistical analysis
of the finer cells that the larger cell occupies. |
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