September 2016
Beginner to intermediate
486 pages
10h 56m
English
book
Mastering QGIS - Second Edition
by Kurt Menke, GISP, Paolo Corti, Richard Smith Jr., GISP, Luigi Pirelli, John Van Hoesen, GISP
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Checking for geometry errors
Data (even from reputable sources) can contain geometry errors. These can often be tiny geometry errors that are not obvious, but which prevent geoprocessing tools from running or producing valid results. QGIS has tools that help you identify such errors.
The Check geometry validity tool (which can be found by navigating to Vector | Geometry Tools | Check Geometry Validity) takes an input vector layer that is loaded in the canvas, and scans the data for errors, such as geometric intersections. The errors can be displayed in a window, or the tool can output the results to a point layer. The resulting point layer will have an attribute describing the error. In the following screenshot, you can see that the tool has been ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.