ndvi calculation

A strange problem arises in the calculation of the date:If the current date is February 29 of a leap year, then for the current date + N years, then the corresponding date becomes February 28. But this does not accord with our common sense, according to common sense, when only 28 days, time should be postponed one day, become March 1.For example, the following SQL band is used to calculate this year's birthday date:SelectName,birthday,now (), Date_add

Label:ALTER FUNCTION [dbo]. [Getage] (@birthday DATETIME)RETURNS NVARCHAR (20)AsBEGINDECLARE @startDatetime DATETIMESET @startDatetime = @birthdayIF (@birthday is not NULLand ISDATE (@birthday) = 1)BEGINDECLARE @age NVARCHAR (20),@y INT,@m INT,@d INT,@now DATETIMESET @now = GETDATE ()SET @y = DATEDIFF (month, @birthday, GETDATE ())/12--set @m = DATEDIFF (month, @birthday, GETDATE ()) --Calculation monthSET @startDatetime = DATEADD (year,DATEDIFF (D, @

Label:days of difference between #两日期/time:to_days (end_time)-to_days (start_time)number of seconds between #两日期/time:SELECT Unix_timestamp (end_time)-Unix_timestamp (start_time);Time difference between #两日期/time score:SELECT sec_to_time (Unix_timestamp (end_time)-Unix_timestamp (start_time));The best way is to directly use the "+", "-" calculation, the current version is supported. For example: SELECT * FROM table_name WHERE Logindate Instance: Sele

usually means that the IO device is experiencing a bottleneck. As we all know, the process of sleep state does not need the CPU, even if all the CPU is idle, the process of sleep is not running, so the number of sleep process is definitely not suitable for measuring CPU load, Linux put uninterruptible The sleep process's calculation of load average directly overturns the original meaning of load average. So on the Linux system, the load average this

This article reprinted to http://blog.sunnyxx.com/2015/05/17/cell-height-calculation/I'm the preface .This article is a summary of what I and our team have recently UITableViewCell using autolayout automatic height calculation and uitableview sliding optimization.We are also maintaining an open source extension, UITableView+FDTemplateLayoutCell so that the height of computing this thing has never been easie

ImportJava.util.Scanner; Public classMoney { Public Static voidMain (string[] args) {Scanner Scanner=NewScanner (system.in); System.out.println ("Please enter calculation method: 1. Simple interest Calculation 2. Compounding 3. Principal calculation 4. Stock term calculation 5. Interest rate

Transferred from: http://blog.sunnyxx.com/2015/05/17/cell-height-calculation/I'm the preface.This article is a summary of what I and our team have recently UITableViewCell using autolayout automatic height calculation and uitableview sliding optimization.We are also maintaining an open source extension, UITableView+FDTemplateLayoutCell so that the height of computing this thing has never been easier, but al

I. Loss of precision in floating-point calculationsProbably a lot of friends with programming experience are not familiar with this problem: no matter what programming language you use, when you use floating-point data for accurate calculations, you may encounter errors in the calculation results. Take a look at the following example.This is an example of a result error when using floating-point data for precise calculations, written in Java, omitted.

Beijing personal income tax calculation method For items such as "Five insurances and one gold" that should be borne by individuals whose income is reduced by the amount received each month, and the remaining balance after the fee of 2000 yuan is deducted, It is the taxable income. Amount of personal income tax payable = amount of taxable income * applicable tax rate-deduction of quick calculation Taxabl

The built-in load calculation tool for Revit MEP is based on the US ASHRAE load calculation standard using thermal balance method (HB) and Radiation Time series (RTS) for load calculations. The tool can automatically identify the building model information, read the area of the building components, volume and other data and calculate. Basic settings 1.1. LocationLocation information is used to

Python implements VSM-based cosine Similarity CalculationIn the case of entity alignment and attribute value decision in the building phase of the knowledge graph, determining whether an article is your favorite article, and comparing the similarity of the two articles, it involves the knowledge of Vector Space Model (VSM) and Cosine similarity calculation.This article describes the theoretical knowledge of VSM and Cosine similarity first, then uses the example of Ruan Yifeng's great god for exp

C-written second-rate calculation four mixed operation projectDevelopment language: C languageDevelopment tools: Visual Studio 2017Finishing Time: August 2, 2017Source code: 500 lines;Development method: C language Multi-file mode developmentImplementation function: Write four mixed expression in file (no matter how long ...) ), press run to produce results.Four mixed operation expressions such as:(19+67) *33-45/5+17*52+39/3+ ....Significance: At the

This article is a summary of what I and our team have recently UITableViewCell using autolayout automatic height calculation and uitableview sliding optimization.We are also maintaining an open source extension, UITableView+FDTemplateLayoutCell so that the height of computing this thing has never been easier, but also by a lot of stars support, GitHub link please poke meIn this summary you can read: Mechanism of UITableView height

Network checksum Calculation 1. Preface Checksum calculation is the basic function of NAT and content modification. After performing these operations, you must modify the checksum in the Data header. 2. 16-bit checksum Calculation 2.1 Basic Principles The IP, ICMP, IGMP, TCP, UDP, and other protocols have the same checksum algorithm. The data streams are regarded

Hello, everyone. You are welcome to watch the cass9.1 video course produced by Lao Wang's documents of work. I am the lecturer of this lesson for nine days. The attachment of our tutorial is also shared. Please note that it is in the measurement space. Contact information of the nine-day instructor Click here to consult our nine-day instructor! Earthwork calculation plays an important role in earthwork and is an important part of engineering desig

Differential line impedance models are similar to single-ended lines, with the biggest difference being that the differential line impedance model has one more parameter S1, the distance between the differential impedance lines (note the distance between the center points of the line).1.edge-coupled Surface microstrip 1 bScope of application: The differential impedance calculation of the outer barrier welding (pre-weld). This model is more

Calculation Description: The calculation rule refers to the calculation between the other "participant type members", the rule calculation must be solved in case the handler is not empty, and the individual "contributor type members" are executed in ordinal order.Calculation algorithm: Set (lowest weight), intersection

Change to: http://www.mahaixiang.cn/jjjq/833.htmlBaidu auction backstage can only set keyword bids, meaning the highest price paid per click. In fact, the same keyword price per click is not necessarily the same. The following small tape you understand the price of the auction click Calculation method.The price per click is calculated as:Spot Click Price Calculation formulaFor example, the search term "flow

From: http://blog.csdn.net/samxx8/article/details/7691868 Similar distances (the smaller the distance, the greater the value) Advantages Disadvantages Range of values Pearsoncorrelation similar to calculating the covariance of two matrices Unaffected by high user ratings or low habits 1. A similar distance cannot be calculated if two items have a similar number less than 2. [You can use the item similar number of thresholds to solve.] The inte

1. Test PurposeTest the performance of dry and aggregate reports on the same hardware and web containers, comparing performance differences in grouping, sorting, filtering, linking, ranking in reports, and their performance in concurrency scenarios. During the test, the dry report will use the built-in calculation engine of the report tool, which uses the built-in calculation engine of the integrated calcul