fillingqgisvisualisation
I am looking to replicate black & white maps in QGis, using hatching patterns and greyscales to indicate different categories of a continuous variable (example below).
It is possible/straightforward to do so in QGis? At first sight I only see color gradients and symbol fills.
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You could try the "New symbology" button (top right on the layer properties panel), then the "Change" button (middle left, under the preview) and then two angled "Line pattern fill".
Another solution : SVG Symbols, cf. Is there a SVG symbol library for qgis?
You don't need a base/initial symbol in this case. Just remove it! You only need two symbols on the same level of the symbology tree.
You can use drag and drop to rearrange the styles:
If you rearrange them as shown in the picture, you can delete the initial one.
Best Answer
It is very straightforward - but you won't get a set of automatic styles for each level. Under 'style', in 'symbol layer type', select a 'line pattern fill':
Add more symbol layers (the green + button in the image above) with line layers at different angles to get crosshatching:
To replicate the map you showed as an example, you'll want to do a 'graduated' symbol type instead of 'single symbol', and do a custom fill for each graduated level.