landsat_LST_video

var utils = require('users/gena/packages:utils');
var text = require('users/gena/packages:text');
var bounds = ee.Geometry.Rectangle([-125.216751,38.420277,-117.132287,48.953600], null, true);

var T_K = ee.List.sequence(0, 38).map(function(n) { // .sequence: number of years from starting year to present
  var start = ee.Date('1982-01-01').advance(n, 'year'); // Starting date
  var end = start.advance(1, 'year'); // Step by each iteration
/////////////////////////////////////////////////////////
//// LST Landsat 4 Kelvin
////////////////////////////////////////////////////////
var Thermal_L4 = ee.ImageCollection("LANDSAT/LT04/C01/T1_SR")
                .filterDate(start, end).filterBounds(bounds)
                .select('B6').map(function(img) {
                   var mask = img.lt(15000);
                   return img.updateMask(mask).multiply(0.1).rename('T_K');
                   }).max();
//print(Thermal_L4, 'T l4');

//Map.addLayer(Thermal_L4, vis_therm, 'thermal L4');
/////////////////////////////////////////////////////////
//// LST Landsat 5 Kelvin
////////////////////////////////////////////////////////
var Thermal_L5 = ee.ImageCollection("LANDSAT/LT05/C01/T1_SR")
                .filterDate(start, end).filterBounds(bounds)
                .select('B6').map(function(img) {
                   var mask = img.lt(15000);
                   return img.updateMask(mask).multiply(0.1).rename('T_K');
                   }).max();
//print(Thermal_L5, 'T l5');
//Map.addLayer(Thermal_L5, vis_therm, 'thermal L5');
/////////////////////////////////////////////////////////
//// LST Landsat 7 Kelvin
////////////////////////////////////////////////////////
var Thermal_L7 = ee.ImageCollection("LANDSAT/LE07/C01/T1_SR")
                .filterDate(start, end).filterBounds(bounds)
                .select('B6').map(function(img) {
                   return img.multiply(0.1).rename('T_K');
                   }).max();
//print(Thermal_L7, 'T l7');
//Map.addLayer(Thermal_L7, vis_therm, 'thermal L7');
/////////////////////////////////////////////////////////
//// LST Landsat 8 Kelvin
////////////////////////////////////////////////////////
var Thermal_L8 = ee.ImageCollection("LANDSAT/LC08/C01/T1_SR")
                .filterDate(start, end).filterBounds(bounds)
                .select('B10').map(function(img) {
                   return img.multiply(0.1).rename('T_K');
                   }).max();
//print(Thermal_L8, 'T l8');
//Map.addLayer(Thermal_L8, vis_therm, 'thermal L8');
//var Thermal_landsat = ee.ImageCollection([Thermal_L4, Thermal_L5,Thermal_L7,Thermal_L8]).max();
//print(Thermal_landsat, 'Thermal_landsat');
 //return Thermal_landsat;
 // get fire power in kW/m2
var Thermal_landsat = Thermal_L4.addBands(Thermal_L5).addBands(Thermal_L7).addBands(Thermal_L8);
 return Thermal_landsat.reduce(ee.Reducer.max()).pow(4).multiply(5.670374419e-8).multiply(0.924).set('system:time_start',start);
 //return frp;
});

T_K = ee.ImageCollection(T_K);
print(T_K,'FRP/A');

//var vis_therm = {min: 273.15, max: 400, palette: ['blue', 
//'cyan','white', 'green','yellow','orange','red']};
/*
var vis_therm = {
  min: 273.15,
  max: 400.0,
  palette: [
    '0602ff', '235cb1', '307ef3', '269db1', '30c8e2', '32d3ef', '3ae237',
    'b5e22e', 'd6e21f', 'fff705', 'ffd611', 'ffb613', 'ff8b13', 'ff6e08',
    'ff500d', 'ff0000', 'de0101', 'c21301'
  ],
};
*/
var vis_therm = {
  min: 0,
  max: 700,
  palette: [
    'black', 'cyan', 'green', 'yellow', 'red'
  ]};  
//Map.addLayer(ee.Image(T_K.get(1)), vis_therm, 'thermal L8');
Map.addLayer(T_K, vis_therm, 'thermal L8');

/////////////////////////////////////////////////////
////////// animation parameters
/////////////////////////////////////////////////////
var animation =  T_K.map(function(image){
  var start = ee.Date(image.get('system:time_start'));
  var end = ee.Date('1996-01-01');
  var label = start.format('YYYY');
  
  return image.visualize(vis_therm).clip(bounds).set({label: label});
});

// annotate
var annotations = [
  {
    position: 'left', offset: '1%', margin: '1%', property: 'label', scale: Map.getScale()*2
  }
]

animation = animation.map(function(image) {
  return text.annotateImage(image, {}, bounds, annotations)
})


// Define GIF visualization parameters.
var gifParams = {
  'region': bounds,
  'dimensions': 300,
  
  'framesPerSecond': 2
};

// Print the GIF URL to the console.
print(animation.getVideoThumbURL(gifParams));