FY-3D/MERSI-Ⅱ数据无缝拼接真彩色影像处理方法

doi:10.3969/j.issn.1673-503X.2023.03.019

摘要/Abstract

摘要：

针对我国极轨气象卫星风云三号D星搭载的第二代中分辨率光谱成像仪MERSI-Ⅱ(Medium Resolution Spectrum Imager-Ⅱ)数据提出一种宽幅真彩色影像图处理方法。该方法通过对MERSI-Ⅱ的3个250 m分辨率的可见光波段进行大气校正处理以及分段增强实现真彩色合成影像, 并基于像素加权融合方法和Wallis匀光方法实现了多轨道数据的无缝拼接处理。应用案例显示通过上述处理方法能够获得高质量的直观易解译的遥感监测影像, 并且有效地解决了极轨气象卫星单轨数据扫描幅宽限制的缺陷, 该方法有助于在突发事件的应急响应中发挥极轨卫星数据的监测服务作用。

关键词: 真彩色, 无缝拼接, 大气校正, 图像增强, 匀光

Abstract:

A wide true color image processing method was proposed for the second generational medium resolution spectrum imager (MERSI-Ⅱ) on board the Chinese Fengyun-3D (FY-3D) polar orbit meteorological satellite.Using this method, the true color-composed image was realized by atmospheric correction and segmented enhancement for the three 250 m resolution visible bands of MERSI-Ⅱ.Then the seamless mosaic of multi-track images was realized based on pixel weighted fusion method and Wallis dodging algorithm.The application cases show that this method can obtain high-quality and intuitive remote sensing monitoring images, and effectively solve the limitation of scanning width of polar-orbit meteorological satellite's single-track data.This method is helpful to use polar orbit satellite data in monitoring services during emergency response.

Key words: True color, Seamless mosaic, Atmospheric correction, Image enhancement, Dodging

中图分类号:

P407.8

何全军,张月维. FY-3D/MERSI-Ⅱ数据无缝拼接真彩色影像处理方法[J]. 气象与环境学报, 2023, 39(3): 161-168.

Quan-jun HE,Yue-wei ZHANG. Seamless mosaic true color image processing method for FY-3D/MERSI-Ⅱ data[J]. Journal of Meteorology and Environment, 2023, 39(3): 161-168.

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通道	臭氧吸收系数a_o	水汽吸收系数
通道	臭氧吸收系数a_o	a	b
1	0.01394	0.0	0.0
2	0.09677	0.0	0.0
3	0.06302	-5.60723	0.82018

亮度	范围
输入亮度	[0, 25]	[25, 55]	[55, 100]	[100, 255]
输出亮度	[0, 90]	[90, 140]	[140, 175]	[175, 255]

波段	标准差之差		平均值之差
波段	匀光前	匀光后	匀光前	匀光后
R	1.93	0.10	2.86	0.34
G	1.65	0.09	2.55	0.35
B	1.52	0.28	0.45	0.00

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