Forecasting Daily Net Irrigation Requirement
Maps Of India Using An ArcGIS Toolbar
Author(s)
A. Bandyopadhyay, K. Mahendra & N. S. Raghuwanshi
Abstract
Considering the vital importance of reference evapotranspiration (ETo) and net
irrigation requirement (NIR) forecasts, a toolbar named Arc DSS_ET was
developed to extend the capabilities of ESRI ArcGIS. The toolbar is capable of
reading the five day forecasted meteorological data from India Meteorological
Department (IMD) website for 75 stations all over India. An existing DSS_ET
model was linked to the toolbar for estimation of ETo and thereby calculation of
NIR for each station depending on the agro-ecological region (AER) in which it
is situated. The toolbar was used to read data from IMD website from 4th
November 2008 to 28th February 2009. These data were then used to estimate
point ETo and NIR values and to prepare five days’ forecasted maps of ETo and
NIR by kriging. Four stations, namely, Ambala, Gadag, Jalpaiguri, and Pune,
were selected to test the accuracy of forecasts. Most of the stations showed
similar accuracy trends with higher accuracy for shorter lead time. It was also
observed that the forecasts were slightly under predicted, but can be used up to
five days as the error in forecasts were within acceptable range. Forecasted ETo,
NIR, and rainfall were compared with the current day estimates and
measurements in terms of Mean Absolute Error (MAE) for all five lead times for
all the stations. Average MAE over AERs showed that error in ETo forecasts
were also within acceptable range. Forecast accuracy of rainfall and NIR were
found satisfactory except for mountaneous and coastal AERs 8, 15, 17, and 19
where frequent occurance of high variability rainfall was noticed.
Keywords: reference evapotranspiration, net irrigation requirement, forecasting,
ArcGIS toolbar, ArcObjects, agro-ecological region.
Keywords
reference evapotranspiration, net irrigation requirement, forecasting,
ArcGIS toolbar, ArcObjects, agro-ecological region.
Related Book
Other papers in this volume
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