NAIP

Map.setCenter(-115.695528, 33.354435, 16.5); 
var dataset = ee.ImageCollection('USDA/NAIP/DOQQ')
                  .filter(ee.Filter.date('2015-01-01', '2019-12-31'));
var trueColor = dataset.select(['R', 'G', 'B']);

var red = dataset.select(['R']).median();
var nir = dataset.select(['N']).median();
var ndvi = nir.subtract(red).divide(nir.add(red)).rename('NDVI');
var ndviVis = {min:-0.15,max:0.35};
Map.addLayer(ndvi,ndviVis,'NDVI');
var ndvi = ndvi.visualize(ndviVis);
Export.image.toDrive({
  image: ndvi,
  description: 'ndviForSite',
  scale: 1});

var trueColorVis = {
  min: 40.0,
  max: 185.0,
};
var trueColorImage = trueColor.median();
Map.addLayer(trueColorImage, trueColorVis, 'True Color');
var trueColorImage = trueColorImage.visualize(trueColorVis);
Export.image.toDrive({
  image: trueColorImage,
  description: 'trueColorImage',
  crs: 'EPSG:3395',
  scale: 1});