https://github.com/elzup/calc-vpd

VPD (Vapor Pressure Deficit) function
https://github.com/elzup/calc-vpd

agriculture iot science vpd

Last synced: 4 months ago
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VPD (Vapor Pressure Deficit) function

• Host: GitHub
• URL: https://github.com/elzup/calc-vpd
• Owner: elzup
• License: mit
• Created: 2018-06-29T01:36:04.000Z (about 8 years ago)
• Default Branch: main
• Last Pushed: 2025-07-25T18:13:51.000Z (11 months ago)
• Last Synced: 2025-07-26T01:01:35.521Z (11 months ago)
• Topics: agriculture, iot, science, vpd
• Language: JavaScript
• Homepage:
• Size: 1.01 MB
• Stars: 0
• Watchers: 2
• Forks: 1
• Open Issues: 12
• Metadata Files:
  • Readme: readme.md
  • License: license

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README

          
# calc-vpd

![Node.js CI](https://github.com/elzup/calc-vpd/workflows/Node.js%20CI/badge.svg)

[![tested with jest](https://img.shields.io/badge/tested_with-jest-99424f.svg)](https://github.com/facebook/jest)

> VPD (Vapor Pressure Deficit) function

- 水蒸気圧 = 6.1078 \* 10 ^ ((7.5 - 気温 / (気温 + 237.3)))

- 飽和水蒸気量 = 217 - 水蒸気圧 / (気温 + 273.15)

- 飽差 = (100 - 相対湿度) \* 飽和水蒸気量 / 100

参考: http://bigbearfarm.blog.fc2.com/blog-entry-306.html

## Install

```

$ npm install calc-vpd

```

## Usage

```js

const calcVpd = require('calc-vpd')

calcVpd({ tmp: 29.2, hmd: 76.5 })

//=> {

//     "swv": 29.080252344,

//     "vp": 40.518038231,

//     "vpd": 6.833859301,

//   }

```

## API

### `calcVpd(input)`

#### input

Type: `{ tmp: number, hmd: number }`

tmp: 気温

hmd: 湿度

#### output

Type: `{ swv: number, vp: number, vpd number }`


vp: 水蒸気圧,

swv: 飽和水蒸気量,

vpd: 飽差

## License

MIT © [elzup](https://elzup.com)