Landsat7_ETM遥感影像L2全球数据(USGS)

美国陆地卫星7 号(Landsat-7 ) 于1999 年4 月15 日由美国航空航天局(NASA) 发射升空，其携带的主要传感器为增强型主题成像仪( ETM+ ) 。
Landsat-7 除了在空间分辨率和光谱特性等方面保持了与Landsat-5 的基本一致外，又增加了许多新的特性，因而受到了各国用户的普遍重视和欢迎。自发射升空至今，已为用户提供了大量高质量的图像数据。Landsat-7每16 天扫瞄同一地区，即其16天覆盖全球一次。
Landsat ETM+影像数据包括8个波段（波段设计），band1-band5和band7的空间分辨率为30米，band6的空间分辨率为60米，band8的空间分辨率为15米，南北的扫描范围大约为170km，东西的扫描范围大约为183km。

Landsat-7 was launched by the National Aeronautics and Space Administration (NASA) on April 15, 1999, with its primary on-board sensor being the Enhanced Thematic Mapper Plus (ETM+).
While maintaining basic consistency with Landsat-5 in terms of spatial resolution and spectral characteristics, Landsat-7 has added numerous new features, thus gaining widespread attention and favor from users worldwide. Since its launch, it has provided users with a large volume of high-quality image data. Landsat-7 scans the same area every 16 days, meaning it covers the entire globe once every 16 days.
Landsat ETM+ image data includes 8 bands (as per the band design). The spatial resolution of band1 to band5 and band7 is 30 meters, that of band6 is 60 meters, and that of band8 is 15 meters. The scanning range is approximately 170 km in the north-south direction and 183 km in the east-west direction.