--- layout: example.html title: Raster Source shortdesc: Demonstrates pixelwise operations with a raster source. docs: >

This example uses a `ol/source/Raster` to generate data based on another source. The raster source accepts any number of input sources (tile or image based) and runs a pipeline of operations on the input pixels. The return from the final operation is used as the data for the output source.

In this case, a single tiled source of imagery is used as input. For each pixel, the Vegetation Greenness Index (VGI) is calculated from the input pixels. A second operation colors those pixels based on a threshold value (values above the threshold are green and those below are transparent).

tags: "raster, pixel, maptiler" resources: - https://unpkg.com/d3@4.12.0/build/d3.js cloak: - key: get_your_own_D6rA4zTHduk6KOKTXzGB value: Get your own API key at https://www.maptiler.com/cloud/ ---