  Map.addLayer(ndvi, {palette: '000000, 00FF00', min: 0, max:.0});  //compare the ndvi in 0000 and 0000  var collection = ee.ImageCollection('LANDSAT/LE00/C00/T0_0DAY_NDVI');  //filter for the year 0000  var filtered0000 = collection.filterDate('0000-00-00', '0000-00-00')  //filter for the year 0000  var filtered0000 = collection.filterDate('0000-00-00', '0000-00-00');  //identify the median pixel value per year for 0000 and 0000   var ndvi0000 = filtered0000.median();  var ndvi0000 = filtered0000.median();  //subtract the 0000 ndvi values from the 0000 ndvi values  var difference = ndvi0000.subtract(ndvi0000).clip(geometry);  