added new gifapar color script

Author: azlinszkysinergise

sentinel-3/OLCI_level_2_land/GIFAPAR_color/index.md

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+---
+title: 
+parent: OLCI_level_2_land
+grandparent: sentinel-3
+layout: script
+nav_exclude: true
+examples:
+- zoom: '9'
+  lat: '46.76527'
+  lng: '17.81158'
+  datasetId: S3OLCI_GIFAPAR
+  fromTime: '2024-09-03T00:00:00.000Z'
+  toTime: '2024-09-03T23:59:59.999Z'
+  platform:
+  - CDSE
+  evalscripturl: https://custom-scripts.sentinel-hub.com/custom-script/ssentinel-3/OLCI_level_2_land/GIFAPAR_color/script.js
+---
+
+
+## General description of the script
+
+This is a simple visualization of GIFAPAR with a green palette. GIFAPAR has values between zero and one
+
+

sentinel-3/OLCI_level_2_land/GIFAPAR_color/script.js

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+//Version=3
+// Simple green color ramp for GIFAPAR index
+// By András Zlinszky, Sinergise - with lots of help from GitHub Copilot
+
+function setup() {
+    return {
+      input: ["GIFAPAR", "dataMask"], 
+      output: [
+        { id: "default", bands: 4 },
+        { id: "index", bands: 1, sampleType: "FLOAT32" },
+        { id: "eobrowserStats", bands: 1, sampleType: "FLOAT32" },
+        { id: "dataMask", bands: 1 }
+      ]
+    };
+  }
+  
+  const ramp = [
+    [-0.5, 0x0c0c0c],
+    [-0.2, 0xbfbfbf],
+    [-0.1, 0xdbdbdb],
+    [0, 0xeaeaea],
+    [0.025, 0xfff9cc],
+    [0.05, 0xede8b5],
+    [0.075, 0xddd89b],
+    [0.1, 0xccc682],
+    [0.125, 0xbcb76b],
+    [0.15, 0xafc160],
+    [0.175, 0xa3cc59],
+    [0.2, 0x91bf51],
+    [0.25, 0x7fb247],
+    [0.3, 0x70a33f],
+    [0.35, 0x609635],
+    [0.4, 0x4f892d],
+    [0.45, 0x3f7c23],
+    [0.5, 0x306d1c],
+    [0.55, 0x216011],
+    [0.6, 0x0f540a],
+    [1, 0x004400]
+  ];
+  
+  let viz = new ColorRampVisualizer(ramp);
+  
+  function evaluatePixel(sample) {
+    let val = sample.GIFAPAR;
+    let ImgVals = viz.process(val); 
+    return {
+      default: ImgVals.concat(sample.dataMask),
+      index: [sample.dataMask == 1 ? sample.GIFAPAR : NaN], 
+      eobrowserStats: [sample.dataMask == 1 ? sample.GIFAPAR : NaN], 
+      dataMask: [sample.dataMask]
+    };
+  }