Download NDVI - MODIS

ndvi_modis_gee.js

//google earth engine (GEE) modis - ndvi downlod

var us_extent = ... // create a geometry for the extent of your study area (such as the US). You can draw a rectangle in GEE.
function clp(img) {
  return img.clip(us_extent)
}
var dataset = ee.ImageCollection('MODIS/061/MOD13A3').filter(ee.Filter.date('2000-01-01', '2021-01-01'));

var clippedVIIRS = dataset.map(clp);

var ndvi = clippedVIIRS.select('NDVI').mean();

var projection = ndvi.projection().getInfo();

Map.addLayer(ndvi, { min: 0, max: 9000}, 'NDVI');

Export.image.toDrive({
    image: ndvi,
    folder:'ndvis_us_2000_to_2020',
    description: '2020',
    crs: projection.crs,
    region:us_extent,
    scale:1000
});