January 2016
Intermediate to advanced
308 pages
6h 35m
English
Content preview from Mastering OpenLayers 3Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Creating a raster calculator
Now that we are familiar with some of the most useful canvas manipulation methods, let's take a look at a renderer that is independent of any image manipulation. There is a very useful source object in the library that can take multiple sources as input and create a new image based on the provided operations. In this example, called ch07_rastcalc, we will use the ol.source.Raster class to build a basic RasterCalculator function.
Raster 101
To understand the limitations of raster manipulation in OpenLayers 3 or, basically, any web mapping application, we should discuss how rasters work in GIS. If you are familiar with the concept, you can skip this part. If not, this section can give you some basic, but valuable, information, ...
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