如何估算焦点

Question

希望您一切都好！ 我正在尝试使用聚焦函数求和栅格值来求和一个核圆，但是刚刚发现帽子中没有class Timer { // Automatically starts the timer constructor(name = 'Benchmark') { this.NS_PER_SEC = 1e9; this.MS_PER_NS = 1e-6 this.name = name; this.startTime = process.hrtime(); } // returns the time in ms since instantiation // can be called multiple times runtimeMs() { const diff = process.hrtime(this.startTime); return (diff[0] * this.NS_PER_SEC + diff[1]) * this.MS_PER_NS; } // retuns a string: the time in ms since instantiation runtimeMsStr() { return `${this.name} took ${this.runtimeMs()} milliseconds`; } }，正如我所期望的那样。 相反，我发现了focus_ *：最大值，最小值，平均值，中位数和众数，估计值。 有没有求和函数的原因吗？ 怎么可能得到这个估计？ 预先感谢。

Answer 1

您可以使用“ image.reduceNeighborhood（）”选项，请参见此处（https://developers.google.com/earth-engine/reducers_reduce_neighborhood）

// Compute sum over round kernel
var result = imgage.reduceNeighborhood({
  reducer: ee.Reducer.sum(),
  kernel: ee.Kernel.circle(7),
});