本文主要翻译自下述GEE官方帮助 https://developers.google.com/earth-engine/guides/scale https://developers.google.com/earth-engine/guides/projections https://developers.google.com/earth-engine/guides/resample#resampling 1 尺度(scale) 尺度(scale)指像元分辨率.GEE中进行分析计算时以影像金字塔

作者:桂. 时间:2017-06-03  15:40:33 链接:http://www.cnblogs.com/xingshansi/p/6937576.html 前言 本文主要记录麦克风阵列的几个基本知识点,并简单介绍基本的波束合成方法:Delay and sum (DSB). 一.栅瓣效应 类似干涉仪中的phase-wrapping问题:传感器的距离超过半波长的距离. A-Beam Pattern 以线性阵列为例 输出为 对应的增益,也就是output,取频率为1KHz的数据: 有时候也用极

Pandas中的resample,重新采样,是对原样本重新处理的一个方法,是一个对常规时间序列数据重新采样和频率转换的便捷的方法. 降采样:高频数据到低频数据 升采样:低频数据到高频数据 主要函数:resample()(pandas对象都会有这个方法) resample方法的参数 参数 说明 freq 表示重采样频率,例如‘M’.‘5min’,Second(15) how=’mean’ 用于产生聚合值的函数名或数组函数,例如‘mean’.‘ohlc’.np.max等,默认是‘mean’,其他常用

下方是pandas中resample方法的定义,帮助文档http://pandas.pydata.org/pandas-docs/stable/timeseries.html#resampling中有更加详细的解释. def resample(self, rule, how=None, axis=0, fill_method=None, closed=None, label=None, convention='start', kind=None, loffset=None, limit=None

周期由高频率转向低频率称为降采样:例如5分钟股票交易数据转换为日交易数据 相反,周期也可以由低频转向高频称为升采样 其他重采样:例如每周三(W-WED)转换为每周五(W-FRI) import pandas as pd import numpy as np # 创建一个时间戳序列 s = pd.Series(np.random.randn(5), index=pd.date_range('2016-04-01',periods=5,freq='M')) # 注意它给的起始时间,与输出的时间对比,

今天老板要处理一批带有时间序列的数据,源数据为1秒钟一行的csv数据,处理之后变成15分钟一行的数据. 源数据示例如下: time B00 B01 ... RollMean2.5 RollMean10 2018-05-31 09:44:39 15.212 5.071 ... 2.97 2.99 2018-05-31 09:44:40 17.202 4.047 ... 2.90 3.08 2018-05-31 09:44:41 10.137 4.055 ... 2.58 2.71 2018-05-

# 重采样 多索引 标准差 协方差 import pandas as pd import numpy as np import copy # 设置列对齐 pd.set_option("display.unicode.ambiguous_as_wide",True) pd.set_option("display.unicode.east_asian_width",True) data = pd.read_excel(r'C:\Users\lenovo\Desktop\

Two Sum 題目連結 官網題目說明: 解法: 從給定的一組值內找出第一組兩數相加剛好等於給定的目標值,暴力解很簡單(只會這樣= =),兩個迴圈,只要找到相加的值就跳出. /// <summary> /// 暴力解O(n) /// </summary> /// <param name="nums"></param> /// <param name="target"></param> /// &

题目链接:Path Sum II | LeetCode OJ Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example: Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11 13 4 / \ / \ 7 2 5 1 return [ [5,4,11,2],

题目链接:Path Sum | LeetCode OJ Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. For example: Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11

Sum of Consecutive Prime Numbers Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 20050   Accepted: 10989 Description Some positive integers can be represented by a sum of one or more consecutive prime numbers. How many such representatio

题目链接:Sum 嗯--不要在意--我发这篇博客只是为了保存一下杜教筛的板子的-- 你说你不会杜教筛?有一篇博客写的很好,看完应该就会了-- 这道题就是杜教筛板子题,也没什么好讲的-- 下面贴代码(不知道为什么我的常数就是大): #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<cmath> #define File(s) freo

You are given a binary tree in which each node contains an integer value. Find the number of paths that sum to a given value. The path does not need to start or end at the root or a leaf, but it must go downwards (traveling only from parent nodes to

Given a non-empty array containing only positive integers, find if the array can be partitioned into two subsets such that the sum of elements in both subsets is equal. Note: Both the array size and each of the array element will not exceed 100. Exam

Given an array which consists of non-negative integers and an integer m, you can split the array into m non-empty continuous subarrays. Write an algorithm to minimize the largest sum among these m subarrays. Note:Given m satisfies the following const

Find the sum of all left leaves in a given binary tree. Example: 3 / \ 9 20 / \ 15 7 There are two left leaves in the binary tree, with values 9 and 15 respectively. Return 24. 这道题让我们求一棵二叉树的所有左子叶的和,那么看到这道题我们知道这肯定是考二叉树的遍历问题,那么最简洁的写法肯定是用递归,由于我们只需要累加左子叶

Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target. Example: nums = [1, 2, 3] target = 4 The possible combination ways are: (1, 1, 1, 1) (1, 1, 2) (1,

Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example: Given a = 1 and b = 2, return 3. Credits:Special thanks to @fujiaozhu for adding this problem and creating all test cases. 这道题是CareerCup上的一道原题,难道

Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list -- whose elements may also be integers or other lists. Different from the previous question where weight

Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k. Example: Given matrix = [ [1, 0, 1], [0, -2, 3] ] k = 2 The answer is 2. Because the sum of rectangle [[0, 1], [