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How can I get the max or min value of one image? I don't know what's the function is in GEE. I have to use this for vegetation coverage For example: [1,2,3, 4,5,6, 7,8,9] max:9;min:1

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Are you looking for something like this?

var geometry = ee.Geometry.Polygon(
    [[[-121.52324218749999, 37.901687004454395],
      [-121.46831054687499, 37.42335315973017],
      [-120.86406249999999, 37.46696534545472],
      [-120.89702148437499, 37.98832531444019]]]);

var modis = ee.ImageCollection("MODIS/MCD43A4_NDVI")
var modis_filtered = modis.filterDate("2010-01-01","2010-04-01").median().clip(geometry)

print(modis_filtered.reduceRegion({
      reducer: ee.Reducer.min(),
      geometry: geometry,
      scale : 250
      }))

More info can be found here

  • Thank you for your help! Honestly, I used Landsat to caculate NDVI, but I think they are the same. – jianjianhahaha Sep 25 '18 at 3:36
  • This is just an example - you can perform the reduce operation on any ee.Image, or ee.ImageCollection whether it be landsat, modis, seneinel, or others. Try substituting your image instead of the modis_filtered variable and examine the results. – kash Sep 25 '18 at 3:40

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