November 2018
Beginner to intermediate
354 pages
6h 59m
English
Content preview from Hands-On Geospatial Analysis with R and QGIS
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Using field calculators for advanced field calculations
Sometimes, we want to select only those records that meet certain criteria for a particular field or fields or some other constraints. We can very easily select a part of the vector layer that meets our given criteria. In this case, we select a railway polyline from railway_polyline.shp:
- Load the railway_polyline.shp shapefile, which is a vector file of railway lines, railway platforms, and other features:
- Open the attribute table of railway_polyline.shp by right-clicking on it in the Layer panel.
- If we scroll down the attribute table, we'll see that there are only two fields and that ...
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