2.1.1 Geography


This section provides a brief description of characteristics and errors associated with the geographical datasets used for the hydrological and other modelling in the Namoi subregion related to the (i) digital elevation model, (ii) surface watercourses, (iii) vegetation height and (iv) land use datasets.

Descriptions of input climate data are also provided for (i) precipitation (P), (ii) maximum and minimum air temperature (Tmax and Tmin) and (iii) net solar radiation (Rn). To characterise errors of the data, the long-term (1980 to 2009) monthly values were calculated along with mean of the root mean square error (RMSE) values. Results showed relative errors of 56%, 1.8% and 7.5% in P, Tmax and Tmin, respectively.

The basic geographic data for the Namoi subregion were reported in companion product 1.1 (Welsh et al., 2014). Details of the source data and methods are provided in Section about observed data. Spatial analyses specific to the Namoi subregion undertaken for some of the meteorological datasets to characterise the errors are presented in Section All these datasets were used directly or indirectly as input to the surface water and groundwater models.

Last updated:
6 December 2018
Thumbnail of the Namoi subregion

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