GLCM_humacao

// calculate texture
var calc_texture = function(scene, geometry){
  var kernel = ee.Kernel.circle({
    radius: 2, 
    units: 'pixels',
  });
  var cropped_scene = scene.clip(geometry).select('b4').glcmTexture({
    size: 2,
    kernel: kernel
  });
  var texture_scene = cropped_scene.select('b4_diss');
  return(texture_scene);
};

// set visual parameters
var textVizParams = {
  bands: ['b4_diss'],
  min: 0,
  max: 750
};

// apply texture functions
var ptero_0701 = calc_texture(pl070117, pterocarpus); // pre-storm
var ptero_0724 = calc_texture(pl072417, pterocarpus); // pre-storm
var ptero_0912 = calc_texture(pl0912, pterocarpus); // post-Irma
var ptero_0928 = calc_texture(pl0928, pterocarpus); // post-Maria
var ptero_1104 = calc_texture(pl1104, pterocarpus); // regrowth
var ptero_1122 = calc_texture(pl1122, pterocarpus); // pre-storm NDVI reached
var ptero_0118 = calc_texture(pl0118, pterocarpus); // secondary succession

// plot
Map.addLayer(ptero_0701, textVizParams, '070117');
Map.addLayer(ptero_0724, textVizParams, '072417');
Map.addLayer(ptero_0912, textVizParams, '0912');
Map.addLayer(ptero_0928, textVizParams, '0928');
Map.addLayer(ptero_1104, textVizParams, '1104');
Map.addLayer(ptero_1122, textVizParams, '1122');
Map.addLayer(ptero_0118, textVizParams, '0118');

// calculate differences
var pre_storm_diff = ptero_0724.subtract(ptero_0701);
var irma_diff = ptero_0912.subtract(ptero_0724);
var maria_diff = ptero_0928.subtract(ptero_0912);
var total_diff = ptero_0118.subtract(ptero_0724);

// plot differences
var diffParams = {
  bands: ['b4_diss'], 
  min: -250, 
  max: 250, 
  "palette":["efa500","0004e4", "efa500"]};
  
Map.addLayer(pre_storm_diff, diffParams, 'pre-storm');
Map.addLayer(irma_diff, diffParams, 'irma');
Map.addLayer(maria_diff, diffParams, 'maria');
Map.addLayer(total_diff, diffParams, 'regrowth');