Creating a Timelapse

var l8=ee.ImageCollection("LANDSAT/LC8_L1T_TOA")
// define the period
var years = ee.List.sequence(2018,2022,1)
print(years)

var l8names = ee.List(["B1","B2","B3","B4","B5","B6","B7","B8","B9","B10","B11","BQA"])

// bands
var l8Bands = ee.List(["b1","blue","green","red","nir","swir1","swir2","cir","tir1","tir2","pan","BQA"])

// Filter based on location
var l8images  = l8.filterBounds(Lagos)

// set cloud threshold
var cloud_thresh = 40;

// Functions
var cloudfunction = function(image){
  //use add the cloud likelihood band to the image
  var CloudScore = ee.Algorithms.Landsat.simpleCloudScore(image);
  //isolate the cloud likelihood band
  var quality = CloudScore.select('cloud');
  //get pixels above the threshold
  var cloud01 = quality.gt(cloud_thresh);
  //create a mask from high likelihood pixels
  var cloudmask = image.mask().and(cloud01.not());
  //mask those pixels from the image
  return image.updateMask(cloudmask);
};

// mask all clouds in the image collection
l8images = l8images.map(cloudfunction);

print(l8images);

// Change the bandnames
l8images = l8images.select(l8names,l8Bands);

print(l8images);

// Combine all data in single collection
var myCollection = ee.ImageCollection((l8images));

// Select the red, green an blue bands
var myCollection = myCollection.select(['red','green','blue'])


// calculate an image for every year
var yearlymap = ee.ImageCollection(years.map(function (y) {
      var image = myCollection.filter(ee.Filter.calendarRange(y, y, 'year'))
                              .median();
      return image.set('year', 2018)
                  .set('date', ee.Date.fromYMD(y,1,1))
                  .set('system:time_start',ee.Date.fromYMD(y,1,1));
}));

print(yearlymap)

// we need an 8-bit format
var coll4Video = yearlymap
  .map(function(image) {
    return image.multiply(512).uint8();   // need to make it 8-bit
  });
  
// export the video to the drive
Export.video.toDrive({
    collection: coll4Video,
    description: "Lagosvid" , 
    scale: 30,
    framesPerSecond: 2,
    region: Lagos
});