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Broken linear reclassification model

This is a model type which applies a reclassification on one map using a broken linear curve.

Classification model (single grid)

This a model type which 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.

Classification model (multiple grids)

This is a model type which performs a reclassification with more then one map as input using a classification table. For example a result map has to 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.

Direct effects

These are for example: the grazing by birds or land use management by mowing.

Effect chain Te effect chain describes the relationships between pressures, doses, environmental conditions and habitat suitability or damage or flood risk.

Indirect effects

These are all the effects via the environmental conditions.


This is used to structure your own project to your wishes. A folder can contain others folder or a group of scenarios. For example you can use a folder to structure you scenarios for different areas. This could be a folder including scenarios and models for the lake IJsselmeer and one for the Waddensea.


These can be used in the Formula-based calculation are all the PCRaster functions. This varies from a simple abstraction and multiplication to more complex neighborhood functions. 

Formula-based calculation model

This is a model type which allows 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).

Map contents

This can be used to view maps, compare values of multiple layers of maps and view and edit legends of maps. It is also possible to add a background map.

Meta information.

See Properties

Models are used to define response curves. There are four types of response curves (Model types):
1. Broken Linear Reclassification
2. Table Reclassification (single grid)
3. Table Reclassification (multiple grids)
4. Formula-based Calculation
Furthermore, there is a model tool to analyse the spatial statistic of a map:
5. Spatial Statistics
Other words for a model is knowledge rule or dose-effect function.
Learn more how to add models.

Nominal map This is a map with values which indicates classes. Examples are soil classes, ecotope classes or administrative classes. Values have no order. See for more information the manual of PCRaster


This is the map calculation tool used by HABITAT. PCRaster is developed by PCRaster Environmental Software/Faculty of Geographical Sciences, Utrecht University (Copyright ©1987-2003). PCRaster can be obtained from

Project is the basis of the HABITAT tool. It is like a word-document from the Word program of Microsoft or the mxd file from ArcGIS.

Project Explorer helps you to browse to the folders, scenarios and models. By double click you can open windows related to a scenario or model. With right click you can add folders, scenarios or models or you can start to run models. The Project Explorer also shows you if maps are available (yellbow cube infront of map) or if they do not exist (yet) with a yellow cube and red cross. It also indicates if HABITAT is calculating and what model or scenario is being calculated dark blue highlighted scenario or model. See picture of Project Explorer

Properties show the meta information and properties of the scenario, model or maps which is active in the Properties explorer area. You can enter here the composer of a model or project, references to documentation etc. See picture of Properties

Real map is a map with continuous data like for instance nutrient concentration, amount of rain, elevation, or wind speed. See for more information the manual of PCRaster


This is a map operations that takes input cell values and replaces them with new output cell values. For example, assigning a value of 1 to cells that have values of 1 to 50, 2 to cells that range from 51 to 100 and so on.

Response curves A response curve is a relation between a dose or condition and the response of a particular factor. This factor can be a species, group of species, damage to agriculture or houses, costs, or flood risks. This can be a simple X Y graph, a table or a formula (see also the section on 'Model types'. The curves are usually qualitative, though they can use quantitative information.
The measured or modelled dose or conditions is generally plotted on the X axis and the response (habitat suitability, costs, damage) is plotted on the Y axis.

Run or calculate.

You can run a:

  • Model,
  • Composite model
  • Folder or
  • Project (all composite models within a project).

Composite model includes a group of models (response curves and statistic analysis). It can be used to group models in order to structure your project. For example to 1) group models and to run it several times for different scenarios or 2) to group models related to the same issue (e.g. the habitat suitability for macrophytes). By grouping your models in a scenario, you can give the HABITAT tool the assignment to run all models within a specific scenario.

Spatial statistic

Spatial statistics is a model type that can calculate statistics of a whole map or a specified area.

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