![[QGIS screenshot showing a manufactured polygon to clip a river layer]](https://shallowsky.com//blog/images/screenshots/qgis/cliplayer.jpg)
The dataset I used for
mapping
fire perimeters
is huge: not surprising if it's all historic fires for the US.
Classifying it in QGIS gave a warning, and operations
were very slow. Here's how to clip a big dataset in QGIS to restrict it
to a smaller geographic area.
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