GOES-19 MCMIPM Series ABI Level 2 Cloud and Moisture Imagery Mesoscale

 // Demonstrates displaying GOES-19 Mesoscale images. 
 // Band names. 
 var 
  
 BLUE 
  
 = 
  
 'CMI_C01' 
 ; 
 var 
  
 RED 
  
 = 
  
 'CMI_C02' 
 ; 
 var 
  
 VEGGIE 
  
 = 
  
 'CMI_C03' 
 ; 
 var 
  
 GREEN 
  
 = 
  
 'GREEN' 
 ; 
 /** 
 * Properly scales an MCMIPM image. 
 * 
 * @param {ee.Image} image An unaltered MCMIPM image. 
 * @return {ee.Image} 
 */ 
 var 
  
 applyScaleAndOffset 
  
 = 
  
 function 
 ( 
 image 
 ) 
  
 { 
  
 var 
  
 names 
  
 = 
  
 image 
 . 
 select 
 ( 
 'CMI_C..' 
 ). 
 bandNames 
 (); 
  
 // Scale the radiance bands using the image's metadata. 
  
 var 
  
 scales 
  
 = 
  
 names 
 . 
 map 
 ( 
 function 
 ( 
 name 
 ) 
  
 { 
  
 return 
  
 image 
 . 
 getNumber 
 ( 
 ee 
 . 
 String 
 ( 
 name 
 ). 
 cat 
 ( 
 '_scale' 
 )); 
  
 }); 
  
 var 
  
 offsets 
  
 = 
  
 names 
 . 
 map 
 ( 
 function 
 ( 
 name 
 ) 
  
 { 
  
 return 
  
 image 
 . 
 getNumber 
 ( 
 ee 
 . 
 String 
 ( 
 name 
 ). 
 cat 
 ( 
 '_offset' 
 )); 
  
 }); 
  
 var 
  
 scaled 
  
 = 
  
 image 
 . 
 select 
 ( 
 'CMI_C..' 
 ) 
  
 . 
 multiply 
 ( 
 ee 
 . 
 Image 
 . 
 constant 
 ( 
 scales 
 )) 
  
 . 
 add 
 ( 
 ee 
 . 
 Image 
 . 
 constant 
 ( 
 offsets 
 )); 
  
 return 
  
 image 
 . 
 addBands 
 ({ 
 srcImg 
 : 
  
 scaled 
 , 
  
 overwrite 
 : 
  
 true 
 }); 
 }; 
 /** 
 * Computes and adds a green radiance band to a MCMIPM image. 
 * 
 * The image must already have been properly scaled via applyScaleAndOffset. 
 * 
 * For more information on computing the green band, see: 
 *   https://doi.org/10.1029/2018EA000379 
 * 
 * @param {ee.Image} image An image to add a green radiance band to. It 
 *     must be the result of the applyScaleAndOffset function. 
 * @return {ee.Image} 
 */ 
 var 
  
 addGreenBand 
  
 = 
  
 function 
 ( 
 image 
 ) 
  
 { 
  
 function 
  
 toBandExpression 
 ( 
 bandName 
 ) 
  
 { 
  
 return 
  
 'b(\'' 
  
 + 
  
 bandName 
  
 + 
  
 '\')' 
 ; 
  
 } 
  
 var 
  
 B_BLUE 
  
 = 
  
 toBandExpression 
 ( 
 BLUE 
 ); 
  
 var 
  
 B_RED 
  
 = 
  
 toBandExpression 
 ( 
 RED 
 ); 
  
 var 
  
 B_VEGGIE 
  
 = 
  
 toBandExpression 
 ( 
 VEGGIE 
 ); 
  
 // Green = 0.45 * Red + 0.10 * NIR + 0.45 * Blue 
  
 var 
  
 GREEN_EXPR 
  
 = 
  
 GREEN 
  
 + 
  
 ' = 0.45 * ' 
  
 + 
  
 B_RED 
  
 + 
  
 ' + 0.10 * ' 
  
 + 
  
 B_VEGGIE 
  
 + 
  
 ' + 0.45 * ' 
  
 + 
  
 B_BLUE 
 ; 
  
 var 
  
 green 
  
 = 
  
 image 
 . 
 expression 
 ( 
 GREEN_EXPR 
 ). 
 select 
 ( 
 GREEN 
 ); 
  
 return 
  
 image 
 . 
 addBands 
 ( 
 green 
 ); 
 }; 
 var 
  
 COLLECTION 
  
 = 
  
 'NOAA/GOES/19/MCMIPM' 
 ; 
 // Select a subset of the collection, correct the values, and add a green band. 
 var 
  
 START 
  
 = 
  
 ee 
 . 
 Date 
 ( 
 '2025-04-07T20:40:00' 
 ); 
 var 
  
 END 
  
 = 
  
 START 
 . 
 advance 
 ( 
 10 
 , 
  
 'minutes' 
 ); 
 var 
  
 collection 
  
 = 
  
 ee 
 . 
 ImageCollection 
 ( 
 COLLECTION 
 ) 
  
 . 
 filterDate 
 ( 
 START 
 , 
  
 END 
 ) 
  
 . 
 map 
 ( 
 applyScaleAndOffset 
 ) 
  
 . 
 map 
 ( 
 addGreenBand 
 ); 
 // Separates the two domains. 
 var 
  
 domain1_col 
  
 = 
  
 collection 
 . 
 filter 
 ( 
 'domain == 1' 
 ); 
 var 
  
 domain2_col 
  
 = 
  
 collection 
 . 
 filter 
 ( 
 'domain == 2' 
 ); 
 // Note that there are 20 assets, 10 in each domain. 
 var 
  
 size 
  
 = 
  
 ee 
 . 
 String 
 ( 
 'sizes: collection = ' 
 ). 
 cat 
 ( 
 collection 
 . 
 size 
 ()); 
 var 
  
 size1 
  
 = 
  
 ee 
 . 
 String 
 ( 
 'domain1 = ' 
 ). 
 cat 
 ( 
 domain1_col 
 . 
 size 
 ()); 
 var 
  
 size2 
  
 = 
  
 ee 
 . 
 String 
 ( 
 'domain2 = ' 
 ). 
 cat 
 ( 
 domain2_col 
 . 
 size 
 ()); 
 print 
 ( 
 size 
 . 
 cat 
 ( 
 '  →  ' 
 ). 
 cat 
 ( 
 size1 
 ). 
 cat 
 ( 
 ' and ' 
 ). 
 cat 
 ( 
 size2 
 )); 
 // Visualization parameters. 
 var 
  
 goesRgbViz 
  
 = 
  
 { 
  
 bands 
 : 
  
 [ 
 RED 
 , 
  
 GREEN 
 , 
  
 BLUE 
 ], 
  
 min 
 : 
  
 0.0 
 , 
  
 max 
 : 
  
 0.38 
 , 
  
 gamma 
 : 
  
 1.3 
  
 }; 
 // Displays a sample image from domain 1 and 2. 
 Map 
 . 
 addLayer 
 ( 
 domain1_col 
 . 
 first 
 (), 
  
 goesRgbViz 
 , 
  
 'Domain 1' 
 ); 
 Map 
 . 
 addLayer 
 ( 
 domain2_col 
 . 
 first 
 (), 
  
 goesRgbViz 
 , 
  
 'Domain 2' 
 ); 
 Map 
 . 
 setCenter 
 ( 
 - 
 86 
 , 
  
 39 
 , 
  
 5 
 );