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I'm making a geological map using QGIS but I don't know how to draw a limestone lithology in QGIS.

To draw other lithologies I combine lines and dots in the best possible way but that is very limited.

Is there a fill pattern library that I can use to do this?

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    Can you provide an example of how it should look? – Alexandre Neto Oct 15 '15 at 20:36
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I downloaded the USGS lithologic patterns from the Univeristy of Otago. At the same time, I installed inkscape software to work with these patterns.

Steps to use these patterns in QGIS: - Open USGS's patterns file in Inkscape -> Select the pattern you want to use -> File: export as a PNG image. I recommend a minimun size of 1125x900 (1500ppp). Don't forget to press 'Export'.

Before converting the PNG image to svg file, crop the borders using any image/photo editor. Otherwise, you will get as a fill pattern a grid of boxes containing the pattern. Now you have a PNG image, go to imagen.online-convert.com/es/convertir-a-svg and convert your png image to svg file. I don't know why but if you save your file as svg in Inkscape you can't use it in QGIS.

Now with your pattern as a svg file, open QGIS, go to 'Options' -> system -> add a new svg path to the folder where you saved your files. Accept. Select a polygon layer and select 'properties' -> style -> select a svg fill. Your folder should appear on the list. Select the pattern you want to use.

About the policy, USGS says that you just have to mention them: "Suggested citation U.S. Geological Survey, 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization (PostScript Implementation): U.S. Geological Survey Techniques and Methods 11-A2 [pubs.usgs.gov/tm/2006/11A02/]."

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  • I followed this and it worked as described. However, is there any way to remove the border around the svg? Using those USGS patterns, and setting as a svg fill in QGIS, you get a grid of of boxes containing the pattern. – rhys Oct 8 '17 at 11:59
  • You are right, I forgot to explain this. I've just updated it. I hope you can make it. – GisAmateur Oct 13 '17 at 15:59
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Look into the using the SVG fill symbol layer type in QGIS, to use a repeating SVG pattern of your choice.

The USGS lithologic patterns have already been converted to SVG and are available from the University of Otago here with a description on how to edit them. A similar starting point to making patterns would be to look at the BGS area ornaments.

I'm not sure what the policy is on reuse of these sources.

We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

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I also downloaded the USGS lithologic patterns from the Univeristy of Otago. I pulled out the pattern section from the Inkscape template document and used a script to split the xml into individual svg patterns. I ran them through "SVG Cleaner" and opened in Inkscape to make sure the rotations and spacings were correct, and saved as plain svg. I then made a batch with the stroke color (or fill where required) as a parameter so they can be attributed to any color in QGIS. you can find all the patterns here:

https://github.com/cecgeology/USGS-FGDC

There is also a QGIS workspace that shows all the patterns (and some blanks for future expansion)

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