帮我写一个用GEE计算年均NDVI和年均气温和年均降水的相关相关性分析的代码
时间: 2024-05-22 14:13:11 浏览: 139
GEE代码编程各类数据的NDVI计算波段方法.txt
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以下是一个用GEE计算年均NDVI和年均气温和年均降水的相关相关性分析的代码:
// Load MODIS NDVI, temperature, and precipitation datasets
var ndvi = ee.ImageCollection('MODIS/006/MOD13A1').select('NDVI');
var temp = ee.ImageCollection('MODIS/006/MOD11A2').select('LST_Day_1km');
var precip = ee.ImageCollection('UCSB-CHG/CHIRPS/DAILY').select('precipitation');
// Define the study area as a geometry
var studyArea = ee.Geometry.Rectangle([-125, 25, -65, 50]);
// Filter datasets by study area and date range
ndvi = ndvi.filterBounds(studyArea).filterDate('2000-01-01', '2020-12-31');
temp = temp.filterBounds(studyArea).filterDate('2000-01-01', '2020-12-31');
precip = precip.filterBounds(studyArea).filterDate('2000-01-01', '2020-12-31');
// Calculate annual mean NDVI, temperature, and precipitation
var annualNDVI = ndvi.mean().reduceResolution(ee.Reducer.mean(), false, 1000);
var annualTemp = temp.mean().reduceResolution(ee.Reducer.mean(), false, 1000);
var annualPrecip = precip.mean().reduceResolution(ee.Reducer.mean(), false, 1000);
// Add NDVI, temperature, and precipitation to a single image
var annualData = ee.Image.cat(annualNDVI, annualTemp, annualPrecip);
// Calculate the correlation matrix for the three variables
var correlation = annualData.reduceRegion({
reducer: ee.Reducer.corr(),
geometry: studyArea,
scale: 1000,
maxPixels: 1e13
});
// Print the correlation matrix
print(correlation);
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