---
title: Accuracy
description: "Closeness of agreement between a measured quantity value and a true quantity value of a measurand."
tags:
- core
- to be approved
- calval ingest
- WGCV
- WGISS
---

# Accuracy

## 1 Definition

Closeness of agreement between a measured quantity value and a true quantity value of a measurand.

### Notes
- In essence, Accuracy reflects how close measurements are to the accepted Value, while precision gauges the reliability and consistency of those measurements.

### Examples

### Sources
- BS ISO 5725-1

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## 2 Definition

Closeness of agreement between a measured quantity value and a true quantity value of a measurand.

### Notes

### Examples

### Sources

- VIM [ [RD18](https://www.bipm.org/en/publications/guides/vim.html) ], GUM [ [RD4](https://www.bipm.org/utils/common/documents/jcgm/JCGM_100_2008_E.pdf) ]
- Definitions used in other communities
- ACIX community
- [Community, not standard, definition]
- Used in the atmospheric correction community to represent the average difference between the modelled and measured quantities