Models are the actual grid processing tools. They are used to define response curves.
Adding a model can be done in two ways:
To change the name of the model, type a name in the Properties window, or change the name by clicking on the model in the project explorer.
Make a habit of filling in the Meta information of models in the Properties window.
There are 5 types of models:
Broken Linear Reclassificationis used to reclassify a map with a broken linear response curve.
It is usefull to model a gradual response on subjects like habitat suitability, damage or flood risk.
The Table Reclassification (single grid)applies a reclassification on one map using a classification table. For example, all values of the input map between 0 and 1 will be 0 in the result map, all values from 1 to 5 will be 0.5 and all values larger then 5 will be 1 in the result map.
The model Table Reclassification (multiple grids)performs a reclassification with more then one map as input using a classification table. For example a map has to be calculated taking into account the values of several maps. For example, if map1 has a cellvalue between 0 and 1 and map2 has a value of 10 then in the result map the cell should get the value 100.
Formula-based Calculationallows you to operate math, multivariate and neigborhoud functions on one or multiple grids. It also allows you to make queries (using the 'if-then-else' function). In fact all the functions from PCRaster can be used in this modeltype. For a description of the PCRaster functions we advise you to look in the PCRaster Manual.
The Spattial Statistics modeltype can be used to calculate the minimum, maximum, average, median, standard deviation of the whole map, a part of the map selected by zooming into a map or in subareas defined by an other map. Furthermore, it is possible to calculate the area of different classes of values, e.g. the habitat suitability between 0 - 0.8 and 0.8 and 1.
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