Google Earth Engine(GEE)——当我们遇到色差问题应该如何处理？

var L8SR_collection = ee.ImageCollection("LANDSAT/LC08/C02/T1_L2"),
    roi = 
    /* color: #d63000 */
    /* shown: false */
    /* displayProperties: [
      {
        "type": "rectangle"
      }
    ] */
    ee.Geometry.Polygon(
        [[[35.656721917962024, -9.845627851094253],
          [35.656721917962024, -10.34249880734705],
          [36.4353779238214, -10.34249880734705],
          [36.4353779238214, -9.845627851094253]]], null, false),
    geometry_1 = /* color: #d63000 */ee.Geometry.Point([35.78712134946283, -9.929366325427338]),
    geometry_2 = /* color: #98ff00 */ee.Geometry.Point([36.311674920891406, -10.291949698399549]);
//**
Map.centerObject(roi,9.3) 
var empty = ee.Image().byte()
var outline = empty.paint({featureCollection:roi, color:1, width:1})
Map.addLayer (outline,{palette:'red'},'Boundary')

//===============================================================================\\
/*
                            1. 影像集合和筛选 (TOA & SR)
*/
//================================================================================\\
//** Timeframe
var start       = '2014-06-01' 
var end         = '2014-11-01'
var cloudcover  =  30
var cloudProperty = 'CLOUD_COVER_LAND'

//** 1. Dry
var drystart = 6
var dryend = 9

//** 2. Wet
var wetstart = 1
var wetend = 5

//============================================================================\\
/*
                          2.数据预处理 (TOA & SR)
*/
//=============================================================================\\
// 对Landsat Collection 2 SR图像进行缩放，并将云层掩码添加为波段。
function maskL8sr(image) {
  // 为不需要的像素制定蒙版（填充、云、云影）。
  var qaMask1 = image.select('QA_PIXEL').bitwiseAnd(parseInt('11111', 2)).eq(0)
    .rename('dilated');
  var qaMask2 = image.select('QA_PIXEL').bitwiseAnd(parseInt('11101', 2)).eq(0)
    .rename('not_dilated');

  // 将缩放系数应用于适当的波段。
  var getFactorImg = function(factorNames) {
    var factorList = image.toDictionary().select(factorNames).values();
    return ee.Image.constant(factorList);
  };
  var scaleImg = getFactorImg([
    'REFLECTANCE_MULT_BAND_.|TEMPERATURE_MULT_BAND_ST_B10']);
  var offsetImg = getFactorImg([
    'REFLECTANCE_ADD_BAND_.|TEMPERATURE_ADD_BAND_ST_B10']);
  var scaled = image.select('SR_B.|ST_B10').multiply(scaleImg).add(offsetImg);

  // 用按比例的波段替换原来的波段，并添加mask。
  return image.addBands(scaled, null, true).addBands([qaMask1, qaMask2]);
}

//** 波段选择
  //** Surface Reflectance
var l8_bands_sr =  ['SR_B1','SR_B2','SR_B3','SR_B4','SR_B5','SR_B6','SR_B7'];
var L8SR_new_names = ['SR_ULTRABLUE','SR_BLUE','SR_GREEN','SR_RED','SR_NIR','SR_SWIR1','SR_SWIR2'];

//============================================================================\\
/*
                      3. 应用函数到影像 (TOA & SR)
*/
//=============================================================================\\
var L8SR_1 = L8SR_collection.filterDate(start,end)
                          .filter(ee.Filter.lte(cloudProperty,cloudcover))
                          .sort(cloudProperty)
                          .filterBounds(geometry_1)
                          .map(maskL8sr)
                          .select(l8_bands_sr,L8SR_new_names)
                          .first()
                          //.clip(roi)

var L8SR_2 = L8SR_collection.filterDate(start,end)
                          .filter(ee.Filter.lte(cloudProperty,cloudcover))
                          .sort(cloudProperty)
                          .filterBounds(geometry_2)
                          .map(maskL8sr)
                          .select(l8_bands_sr,L8SR_new_names)
                          .first()
                          //.clip(roi)
                         

var collection = ee.ImageCollection([L8SR_1,L8SR_2])
var L8_SRMosaic = collection.median()

//============================================================================\\
/*
                      4. 可视化参数设定 (TOA & SR)
*/
//=============================================================================\\

//** Prefered band combination
var truecolor_SR = ['SR_RED','SR_GREEN','SR_BLUE']
var falsecolor_SR = ['SR_NIR','SR_SWIR1','SR_SWIR2']

var l8SR_visualization = {
                          bands: falsecolor_SR,
                          min: 0.05,
                          max: 0.39,
                       };

//============================================================================\\
/*
                      5. 添加图层到地图上
*/
//=============================================================================\\
Map.addLayer (L8_SRMosaic.clip(roi),l8SR_visualization,'L8 SR Mosaic'+start+'/'+end)