Geography Reference
In-Depth Information
4.2.4 Ancillary Data
Ancillary data is used to facilitate a better understanding of LULC-dynamics and
the reasons behind them. There are a various obtainable types of ancillary data:
digital elevation models; soil map; housing and population density; road network;
temperature; and precipitation. These can be integrated, as external inputs to
remotely sensed data into a classification process in various concepts (Lu and
Weng 2007 ). This integration has the benefit of improving the overall accuracy of
produced thematic maps based on classification of remote sensing imagery. The
percentage of this improvement based essentially on the used classifier (Heinl et al.
2009 ).
Climatic data (e.g., precipitation) was gathered for the climatic stations that
existed in the major governorates within the ERB: Aleppo, Arraqqa, and Deir
Azzour, during the temporal period of the study. These were obtained from the
General Organization for Meteorology in Damascus. These data were useful for
radiometric normalization using (iMAD) (see Chap. 5.2.3 ) . Ancillary data for the
entire water basin of the Euphrates is also included, as well as the agricultural
calendar.
References
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