How often do we need to calibrate the models? Revalidation of the MOLAND model calibrated for the Greater Dublin Region (original) (raw)

Official population and land cover data for 2012 was used to revalidate the MOLAND model calibration implemented for the Greater Dublin Region based on the datasets of 1990, 2000 and 2006. While initially it was assumed that parameter values from the 2000-2006 calibration period would be more relevant for future scenario simulations; it was learned that after economic crisis and recent recovery in Ireland, 1990-2006 calibration parameter values give more accurate results. Calibration and validation are necessary and important processes for the practical application of most urban models. In general, calibration is an iterative procedure of a model parameter valuation based on comparison of the simulated and observed values. Validation is an extension of the calibration procedure. It is intended to assure that the calibrated model properly assesses all the variables and conditions which can affect model results, and demonstrate the ability to predict observations for periods separate from those included in the calibration effort.