Seasonal Trajectories PPI visualisation script

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      //VERSION=3

// This custom script visualises Seasonal Trajectories PPI

function setup() {
  return {
    input: ["PPI", "dataMask"],
    output: { bands: 4},
    mosaicking: Mosaicking.TILE
  }
}
const map =
[
  [0.0000, 0xFFFFE5],
  [0.3750, 0xF7FCB9],
  [0.7500, 0xD9F0A3],
  [1.1250, 0xADDD8E],
  [1.5000, 0x78C679],
  [1.8750, 0x41AB5D],
  [2.2500, 0x238443],
  [2.6250, 0x006837],
  [3.0000, 0x004529]
]

const visualizer = new ColorMapVisualizer(map);
//EvaluatePixel function
function evaluatePixel(samples) 
{
  for (let i = 0; i < samples.length; i++) 
  {
    let sample = samples[i];
    if (sample.dataMask == 1) 
    {
  return [visualizer.process(sample.PPI*0.0001)[0], visualizer.process(sample.PPI*0.0001)[1], visualizer.process(sample.PPI*0.0001)[2], sample.dataMask];
    }
  }
} 

General description of the script

This script visualises seasonal trajectories PPI . The Seasonal Trajectories PPI is derived through fitting a smoothing and gap filling function to the yearly time-series raw PPI values. The color map is adopted from https://github.com/jacobs-tim/copernicus-land-monitoring-service-hrvpp-colourmaps

Description of representative images

2020 late July seasonal trajectories PPI over Brăila Romania

Resources

• Data source

• Entry in public collections