Ship detection script for Sentinel hub, forked from custom-script hub.

ship-detection.js

//VERSION=3
// Ship detection with S1 and S2
// Original source: https://custom-scripts.sentinel-hub.com/custom-scripts/data-fusion/ship_detection_s1_s2/script.js
// Original author: Monja B. Šebela
// Fork author: Pontus J. Karlsson

function setup() {
  return {
  	input: [
   	 {datasource: "S2L1C", bands:["B02", "B03", "B04", "B08"], mosaicking: "ORBIT"},
   	 {datasource: "S1GRD", bands:["VV", "VH"], mosaicking: "ORBIT"}
  	],
  	output: [
   	 { id: "default", bands: 3, sampleType: SampleType.AUTO }
  	]
  };
}

function evaluatePixel(samples, inputData, inputMetadata, customData, outputMetadata) {
 var S2L1C = samples.S2L1C[0]
 var S1GRD = samples.S1GRD[0]

 if (S1GRD == undefined || S2L1C == undefined) {
   return {
     default: [1,1,1]
   }
 }
 
 let ndwi = (S2L1C.B03 - S2L1C.B08) / (S2L1C.B03 + S2L1C.B08)
 
 if ((ndwi > 0.1) && ((S1GRD.VV > 0.3) || (S1GRD.VH > 0.3))) {
    return {
      default: [
        1,
        1,
        1
      ]
    }
 } else if (ndwi > 0.1){
    return {
      default: [
        (4 * S2L1C.B04) - 0.2, 
        (4 * S2L1C.B03) - 0.2, 
        (5 * S2L1C.B02) - 0.2
      ]
    }
 } else {
    return {
      default: [
        (4 * S2L1C.B04) - 0.2, 
        (4 * S2L1C.B03) - 0.2, 
        (4 * S2L1C.B02) - 0.2
      ]
    }
 }
}