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intersect.html
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<title>Analysis - Intersect</title>
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<h1 id="top">Analysis Toolbox - Overlay Toolset - Intersect</h1>
<br>
<a href="../Analysis/">Back To The Analysis Toolbox</a><br>
<a href="..">Back To Homepage</a><br>
The <b>Intersect</b> tool in QGIS is very similiar tool to the one in the Analysis Toolbox,
To reach it go to the <b>Processing Toolbox</b>.
If you don't know how to open it, feel free to head over to the <a href="../Basics/processing.html">Introduction To The Processing Toolbox</a>.<br>
After opening the processing toolbox we can either search or go to the <b>Vector Overlay</b> tools with the QGIS marker,
there we can find the <b><a href="https://docs.qgis.org/2.18/en/docs/user_manual/processing_algs/qgis/vector_overlay_tools.html?highlight=intersection#intersection">Intersection</a></b> tool,
It should be there and also in the <b>Vector Panel -> Geprocessing Tools -> Difference</b>, both locations are shown below.<br>
</br><img src="img/intersect_db0.PNG" height=300px width=445px/></br>
</br><img src="img/intersect_db1.PNG" height=510px width=470px/></br></br>
The Intersection window should now open, i wanted to get the intersction between the purple <i>training 1 polygon</i> layer and the orange <i>polygon</i> layer<br>
</br><img src="img/intersect_db2.PNG" height=566px width=814px/></br></br>
</br><img src="img/intersect_db3.PNG" height=378px width=867px/></br></br>
If i only want to use some of my fields in the new layer then i have to decide which of my layers will be the <i>Input</i> and which the <i>Overlay</i>. <br>
</br><img src="img/intersect_db4.PNG" height=567px width=816px/></br></br>
The output can be saved to a new layer in many different options, I chose to use a temporary layer, you can use a file or PostGIS\Geopackage table.<br>
</br><img src="img/intersect_db5.PNG" height=569px width=817px/></br></br>
My output looks like this, with three distinct polygons (the middle one is selected).<br>
</br><img src="img/intersect_db6.PNG" height=250px width=250/></br></br>
And thats it, Simple and easy to use, and now you know how to do that in Open Source.
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