I am new to GEE and Javascript. I was looking for a solution to calculate the area of NDVI values above 0.2 from the years 1989 and 2018, and quantify vegetation loss. Is this possible? I have pasted the codes below. https://code.earthengine.google.com/48b9e089abdb51354c45333c7ea8b0f2
var MMR =
/* color: #d63000 */
/* displayProperties: [
{
"type": "rectangle"}
] */
ee.Geometry.Polygon(
[[[112.21780240632957, 30.2114140665558],
[112.21780240632957, 29.295784619630325],
[113.23403775789207, 29.295784619630325],
[113.23403775789207, 30.2114140665558]]], null, false);
// Load 1989 and 2010 Landsat5 annual composites.
var image1989 = ee.ImageCollection("LANDSAT/LT05/C01/T1").filterDate('1989-01-01','1989-12-31')
.filterBounds(MMR)
.median()
.clip(MMR);
var image2010 = ee.ImageCollection("LANDSAT/LT05/C01/T1").filterDate('2010-01-01','2010-12-31')
.filterBounds(MMR)
.median()
.clip(MMR);
// Compute NDVI the easy way.
var ndvi1989 = image1989.normalizedDifference(['B4', 'B3']);
var ndvi2010 = image2010.normalizedDifference(['B4', 'B3']);
// Compute the multi-band difference image.
var diff = ndvi1989.subtract(ndvi2010);
var NDVI_Palette = '00FF00, FFFF00, 000000';
Map.addLayer(ndvi1989.gte(0.2), {min: -0.3, max: 0.4, palette: NDVI_Palette}, "NDVI 1989");
Map.addLayer(ndvi2010.gte(0.2), {min: -0.3, max: 0.4, palette: NDVI_Palette}, "NDVI 2010");
Map.addLayer(diff, {min: -0.3, max: 0.4, palette: NDVI_Palette}, "Difference NDVI", false);
Map.centerObject(MMR, 9);