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Rule-Based Classification
This example shows how to perform a single classification of pools and roofs through rule-based classification.
This project is called “Rule_based_classification” and uses the Top Down operators TA_Baatz_Segmenter and Dummy Top Down, and the Bottom Up operator Generic Bottom Up.
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Step-by-step
Start InterIMAGE, click on File, New Project, and type the fields according to the following:
Now insert three nodes, namely pools, roofs and background. All these three nodes will have the Top Down operator TA_Baatz_Segmenter, as shown below.
All nodes, including node Scene, will have the Bottom Up operator Generic Bottom Up, with the following rule:
To classify, one can use the attribute ratio for band 1, as follows:
- pools
- ratio(band 1) < 0.3
- roofs
- ratio(band 1) > 0.4
- background
- ratio(band 1) >= 0.3 AND ratio(band 1) < = 0.4
Then one inserts these rules in the three nodes, by clicking in TopDown Decision Rule. Note: Select the option No Merge, as the Lower-level Rule for all Top Down nodes.
After inserting the rules and starting the project, the resulting classification will look as follows: