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--- interimage:examples:example4 [2011/08/15 19:22] – created rsilva
+++ interimage:examples:example4 [2011/08/16 20:59] (atual) – rsilva
@@ Linha 17: / Linha 17: @@
   * tijuca.tif
@@ Linha 33: / Linha 44: @@
 ===== Step by step =====
+  * Start InterIMAGE. Click on //File// -> //New Project// and fill the fields according to the following:
+{{interimage:examples:example4_1_2.png|New Project}}
+  * Check the //Default Image// checkbox and click the //Add// button. Click OK.
+  * Create a semantic net like this one:
+{{interimage:examples:example4_2.png|Semantic net}}
+  * Associate the //TA_Arithmetic// top-down operator to the //Vegetation// node. Set the operator parameters according to the image below. Make sure the //TopDown Multi-class// checkbox is checked.
+{{interimage:examples:example4_3.png|Selecting the operator}} -> {{interimage:examples:example4_4.png|Setting its parameters}}
+  * Save the project and execute the interpretation. You should obtain something like this:
+{{interimage:examples:example4_5.png|Analysis ready}}
+  * You can change the parameters values and re-execute the interpretation until you are satisfied with the result.
+  * Now, add a //Shadow// node.
+{{interimage:examples:example4_6.png|Semantic net}}
+  * Select the //Vegetation// node. Uncheck the //TopDown Multi-Class// checkbox and set its parameters according to the image below:
+{{interimage:examples:example4_7.png|Changing the parameters values}}
+  * Associate the //TA_Arithmetic// top-down operator to the //Shadow// node. Set the operator parameters according to the following:
+{{interimage:examples:example4_8.png|Selecting an operator}}
+  * Save the project and re-execute the interpretation.
+  * The aim of this step was to show how the reliability values affect the interpretation process. Basically, if two polygons are competing for the same image region, the one with the higher reliability value will prevail. In this case, we had this priority list: 1. //Shadow//, 2. //Vegetation// and 3. //Non-vegetation//.
+  * Now, try to change the reliability value of the //Vegetation// node to 0.5. Save the project and re-execute the interpretation. By doing it, we are taking the //Vegetation// class to the front of the list. Here is a comparison between the two results:
+{{interimage:examples:example4_9.png|Result with the first priority list}} -> {{interimage:examples:example4_10.png|Result with the second list}}
+  * Sometimes, it can be interesting to know how this decision process takes place. Let's see what happened to the original //Shadow// polygons by adding this information to the visualization window.
+  * Select the //Selection// tab and click the //Add// button. Fill the fields according to the image below then click //Save//.
+{{interimage:examples:example4_11.png|Adding a Selection layer}} -> {{interimage:examples:example4_12.png|Adding a Selection layer}}
+  * By using the visualization tools you can compare which //Shadow// regions remained and which were discarded.
+{{interimage:examples:example4_13.png|Comparing the polygons}}