added simple panchromatic script

Author: azlinszkysinergise

sentinel-2/sentinel-2.md

@@ -156,6 +156,7 @@ Dedicated to supplying data for [Copernicus services](https://www.esa.int/Our_Ac
  - [Aesthetic Neon](/sentinel-2/aesthetic-neon) - Aesthetic visualization for urban and dry (desert) areas
  - [Total Ozone Column over Antarctica snow](/sentinel-2/ozone_column_over_snow)
  - [BRDF normalisation](/sentinel-2/brdf)
+ - [Simple Panchromatic](/sentinel-2/simple_panchromatic) - Create a simple greyscale visualization by averaging the 10m true color and NIR bands
 
 #### Scripts including machine learning techniques (eo-learn)
 

sentinel-2/simple_panchromatic/img/nairobi.jpg

@@ -0,0 +1,32 @@
+---
+title: Sentinel-2 Simple Panchromatic
+parent: sentinel-2
+layout: script
+nav_exclude: true
+scripts:
+- - Sentinel-2
+  - script.js
+- - Sentinel-2 Quarterly Cloudless Mosaics
+  - script_mosaics.js
+examples:
+- zoom: '14'
+  lat: '42.76703'
+  lng: '36.823'
+  datasetId: S2L2A
+  fromTime: '2025-03-03T00:00:00.000Z'
+  toTime: '2025-03-03T23:59:59.999Z'
+  platform:
+  - CDSE
+  - EOB
+  evalscripturl: https://custom-scripts.sentinel-hub.com/custom-scripts/sentinel-2\simple_panchromatic\script.js
+---
+
+## General description of the script
+
+This script is for creating a simple panchromatic greyscale visualization from Sentinel-2. It simulates the way a panchromatic band works by taking the average of bands 2 (Red), 3 (Green), 4 (Blue), and 8 (wide-band near infrared). The suggested use is for backgrounds in a scene compare, or as an input for pansharpening of lower resolution bands. The script also works for quarterly cloudless mosaics.
+
+## Description of representative images
+
+This scene is a Sentinel-2 image of Nairobi, Kenya
+
+!['Sentinel-2 simple panchromatic image of Nairobi, Kenya on 3 March 2025'](.\img\nairobi.jpg)

sentinel-2/simple_panchromatic/index.md

@@ -0,0 +1,20 @@
+//VERSION=3
+//Simple Panchromatic visualization of Sentinel-2 data, using the mean of the band intensities for Red, Green, Blue and Near Infrared
+//By András Zlinszky, Sinergise - with help from GitHub Copilot
+//https://bsky.app/profile/azlinszky.bsky.social
+
+function setup() {
+    return {
+      input: ["B01", "B02", "B03", "B08", "dataMask"],
+      output: { bands: 4 }
+    };
+  }
+  
+  const gain = 2.5;
+  
+  function evaluatePixel(sample) {
+    // Calculate the mean of the bands
+    let pan = (sample.B01 + sample.B02 + sample.B03 + sample.B08) / 4;
+  
+    return [gain * pan, gain * pan, gain * pan, sample.dataMask];
+  }

sentinel-2/simple_panchromatic/script.js

@@ -0,0 +1,20 @@
+//VERSION=3
+//Simple Panchromatic visualization of Sentinel-2 data, using the mean of the band intensities for Red, Green, Blue and Near Infrared
+//By András Zlinszky, Sinergise - with help from GitHub Copilot
+//https://bsky.app/profile/azlinszky.bsky.social
+
+function setup() {
+    return {
+      input: ["B01", "B02", "B03", "B08", "dataMask"],
+      output: { bands: 4 }
+    };
+  }
+  
+  const gain = 0.00025;
+  
+  function evaluatePixel(sample) {
+    // Calculate the mean of the bands
+    let pan = (sample.B01 + sample.B02 + sample.B03 + sample.B08) / 4;
+  
+    return [gain * pan, gain * pan, gain * pan, sample.dataMask];
+  }