GIS Lesson 4 3: Categorized, Graduated and Rule Based Renderer for Polygons

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In this tutorial we will cover Categorized, Graduated and Rule Based Renderer for Polygons. We will use the field calculator to calculate the area of a polygon and use it for a graduated renderer with different color schemes.

The written version of this lesson can be found here:
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Will this only work with polygon data, and not point data?

learnbiology
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Until here, the tutorial was great. Now im stuck because "output field length" and "precision" is grey and not changeable. Also you obviously changed something at 7:12 and don't explain what. Therefore my attribute table looks different and QGIS kills itself when "graduating". Why would you change something so obviously and not explain it. Really annoying.

zockbrocken