Gee: calculate the maximum and minimum values of pixels in the image area

GEE: Calculation image Max min pixel in region

Use GEE Count the maximum and minimum values of pixels in the specified area （ Such as DEM） when , Need to be used GEE Medium .regionReducer and reducer function .

min & max

Maximum ：ee.Reducer.max()
minimum value ：ee.Reducer.min()
Max min ：ee.Reducer.minMax()

Code implementation

Maximum

// Given area 
var CQ = 
    /* color: #98ff00 */
    /* shown: false */
    ee.Geometry.Polygon(
        [[[107.81231551184783, 29.581711188146137],
          [108.25176863684783, 30.49472925792531],
          [110.00958113684783, 31.173930341237376],
          [108.60333113684783, 31.922923346675326],
          [106.84551863684783, 30.418966567079185],
          [105.35137801184783, 30.418966567079185],
          [105.35137801184783, 29.428726935782418],
          [107.10919051184783, 28.89146956313381]]]);
          
// Choose a dataset , Choose here DEM
var DEM=ee.Image("CGIAR/SRTM90_V4");
// Statistical maximum 
var max=DEM.reduceRegion({
    
  reducer:ee.Reducer.max(),
  geometry:CQ,
  scale:90
});  
print(max) 

Output results ：

minimum value

// Given area 
var CQ = 
    /* color: #98ff00 */
    /* shown: false */
    ee.Geometry.Polygon(
        [[[107.81231551184783, 29.581711188146137],
          [108.25176863684783, 30.49472925792531],
          [110.00958113684783, 31.173930341237376],
          [108.60333113684783, 31.922923346675326],
          [106.84551863684783, 30.418966567079185],
          [105.35137801184783, 30.418966567079185],
          [105.35137801184783, 29.428726935782418],
          [107.10919051184783, 28.89146956313381]]]);
          
// Choose a dataset , Choose here DEM
var DEM=ee.Image("CGIAR/SRTM90_V4");
// Statistical maximum 
var min=DEM.reduceRegion({
    
  reducer:ee.Reducer.min(),
  geometry:CQ,
  scale:90
});  
print(min) 

Output results ：

Simultaneously calculate the maximum and minimum values

The maximum and maximum values of the region pixels can be obtained at the same time , as follows ：

// Given area 
var CQ = 
    /* color: #98ff00 */
    /* shown: false */
    ee.Geometry.Polygon(
        [[[107.81231551184783, 29.581711188146137],
          [108.25176863684783, 30.49472925792531],
          [110.00958113684783, 31.173930341237376],
          [108.60333113684783, 31.922923346675326],
          [106.84551863684783, 30.418966567079185],
          [105.35137801184783, 30.418966567079185],
          [105.35137801184783, 29.428726935782418],
          [107.10919051184783, 28.89146956313381]]]);
          
// Choose a dataset , Choose here DEM
var DEM=ee.Image("CGIAR/SRTM90_V4");
var maxmin=DEM.reduceRegion({
    
  reducer:ee.Reducer.minMax(),
  geometry:CQ,
  scale:90
});
print(maxmin)

Output results ：