Google Earth Engine (GEE) - counts the image coverage of a certain place

Statistics on the coverage of a certain satellite image in a certain area.

Taking Shandong Province as an example, statistics on the total coverage of Landsat images in 2021 are as follows:

code

//研究区 
var roi = ee.FeatureCollection("users/sihaixiang/shandong").geometry();  
Map.centerObject(roi, 7);  
Map.addLayer(roi, {color:"black"}, "roi");  

//数据集
var l8 = ee.ImageCollection("LANDSAT/LC08/C01/T1_TOA");    
var Count = l8.filterDate('2021-1-1','2021-12-31')  
                  .filterBounds(roi)  
                  .select("B1")  
                  .reduce(ee.Reducer.count())
                  .clip(roi);  
var visParams = {  
      min:0,   
      max: 80,   
      palette: ["#28C9EC","#41CFDA","#5FD6C2","#84DFA3","#B4EC78","#D3F457","#F2FC33"]  
};  

Map.addLayer(Count, visParams, "Count");

exhibit