How to find min and max pixel value of an index?

Question

I tried computing NDVI min and max trying this code but failed.

var ndvimin = NDVI.reduce(ee.Reducer.min());
print(ndvimin, 'NDVI min');

Help will be aprreciated.

Answer 1

Try using .reduceRegion() and specifying the region of interest:

var NDVI = ee.Image('assetID') // specify the image of interest
var roi = ee.Geometry.Polygon([[-98,44], [-96,44], [-96,46], [-98,46], [-98,44]]) // specify your region of interest

var minMaxValues = NDVI.reduceRegion({reducer: ee.Reducer.minMax(),
                                 geometry: roi 
                                 })

print('minMaxValues', minMaxValues);