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Agroclimatic zoning of Azarbayjan-Sharghi province for rainfed almond using GIS Information layers preparation in GIS Digital elevation model(DEM) Digital elevation model(DEM) was prepared using topographic map.For this purpose Arc/Info software and a Digitizer were used. Considering zone 38 as a base zone the digited map converted to UTM project system. By exporting the layer prepared in Arc/Info to IDRISI software the format of the map was converted from vector to raster base.DEM of area is illustrated in Fig.(2-1) . Probability of annual precipitation greater than 250mm map Rainfall is very important in dryland farming so we prepared a coverage for it.First of all the best statistical distribution for rainfall data was determined using HYFA software, probability of occurrence annual precipitation greater than 250mm was calculated then for each station.Regression equation between elevation and POAP was calculated(Table(2-2)). Finally this equation was applied on DEM of area and obtained map was classified based on the following conditions (Fig.22): Areas in which POAP is more than 0.80 is known as the firs class. Areas in which POAP is between .60 to 0.80 is known as the second class. Areas in which POAP is between .40 to .60 is known as the third class. Areas in which POAP is less than 0.40 is known as the fourth class.  Table( 2-2): Correlation equations between studied parameters and elevation(m)
Probability of chilling occurrence map: Similar to precipitation layer after fitting a good statistical distribution to minimum temperature the PCO was calculated for each station.in order to draw geographical distribution of PCO and elavation was determined for the area(table(2-2)). Existing map was classified to 4 zones(Fig(2-3)) as following: Areas in which the PCO is less than 0.25 are known as the first class zone. Areas in which the PCO is between 0.25 to 0.50 are known as second class. Areas in which the PCO is between 0.50 to 0.75 are known as third class. Areas in which the PCO is more than 0.75 are known as fourth class.  |