ASTER系列数据下载方法

本系列的文章由知乎用户“Gooong”授权转载

 

数据概况

ASTER是美国NASA(宇航局)与日本METI(经贸及工业部)合作并有两国的科学界、工业界积极参与的项目。它是Terra卫星上的一种高级光学传感器,包括了从可见光到热红外共14个光谱通道,可以为多个相关的地球环境资源研究领域提供科学、实用的卫星数据。

Terra卫星(也被称为EOS-AM1卫星)于1999年12月18日发射升空,是EOS计划的第一颗卫星。Terra卫星上共有五种传感器,能同时采集地球大气、陆地、海洋和太阳能量平衡等信息:

  • 云与地球辐射能量系统CERES
  • 中分辨率成像光谱仪MODIS
  • 多角度成像光谱仪MISR
  • 先进星载热辐射与反射辐射计ASTER
  • 对流层污染测量仪MOPITT

TERRA卫星参数

所属国家 美国、日本、加拿大
设计寿命(年) 5
发射时间 1999-12-18
预计失效时间 2010-12-31
卫星重量(千克) 5190
轨道类型 近极地太阳同步轨道
轨道高度(千米) 705
轨道倾角(°) 98.2
运行周期(分钟) 98.1
每天绕地球圈数 15
降交点地方时 10:30
轨道重复周期(天) 16
传感器数量 5
下行速率(Mbps) 18.5

波段介绍

ASTER传感器有三个谱段:可见光近红外谱段、短波红外谱段和热红外谱段。可见光近红外波段有4个,短波红外有6个,热红外波段有5个,共15个波段。ASTER数据分辨率为15至90米,扫描幅宽为60千米。

卫星及传感器 波段数量 分辨率(米) 扫描幅宽(千米
卫星 传感器 全色 可见光 近红外 短波红外 热红外 雷达 最高 最低 垂直轨道方向
Terra ASTER VNIR 2 2 15 15 60
ASTER SWIR 6 30 30 60
ASTER TIR 5 90 90 60

ASTER传感器波段情况

波段编号 波段类型 波长范围(微米) 侧视角(°) 分辨率(米)
B1 可见光近红外波段 0.52~0.60 +/-24 15
B2 可见光近红外波段 0.63~0.69 +/-24 15
B3 可见光近红外波段 0.76~0.86 +/-24 15
立体后视 可见光近红外波段 0.76~0.86 +/-24 15
B4 短波红外 1.60~1.70 +/-8.55 30
B5 短波红外 2.145~2.185 +/-8.55 30
B6 短波红外 2.185~2.225 +/-8.55 30
B7 短波红外 2.235~2.285 +/-8.55 30
B8 短波红外 2.295~2.365 +/-8.55 30
B9 短波红外 2.360~2.430 +/-8.55 30
B10 热红外 8.125~8.475 +/-8.55 390
B11 热红外 8.475~8.825 +/-8.55 90
B12 热红外 8.925~9.275 +/-8.55 90
B13 热红外 10.25~10.95 +/-8.55 90
B14 热红外 10.95~11.65 +/-8.55 90

常用领域

  • 在科研领域,ASTER数据可被用于监测活火山的活动规律、监测海岸线的侵蚀和下沉状况、热带雨林地区的植被监测、海洋珊瑚、暗礁地图的测量、分析沿海地带的海平面温度变化、极地雪川、冰河以及云量的研究
  • 在应用领域,ASTER数据可被用于农作物估产、土壤质量调查、森林以及平原火灾的调查、野生动物生活环境的调查、地形图的制作、土地使用状况分类、城市发展动态监测、交通和运输路线调查、近海和近河地区的洪水监测、地质特征、地质特征分类、岩石记述学、岩石和土壤的界定、火山分布状况调查、水资源调查、石油泄漏以及其它污染的调查、大气环境监测、水污染监测及土壤污染分布调查。

下载方法

AsterWeb 网站列出了几个下载源,本文档介绍从USGS EarthExplorer下载数据的方法:

  1. 打开USUS EarthExplorer网站:https://earthexplorer.usgs.gov,需要在右上角进行用户注册或登录

小技巧

使用gmail或学校邮箱邮箱进行注册,收邮件可能会快一些

_images/EarthExplorer.png

  1. 左侧标签栏点击”Search Criteria”,选择合适的影像范围和时间,可以通过搜索地点或输入坐标来选择范围

_images/Select.png

  1. 影像时间和范围确定后,点击”DataSet”进入数据集选择菜单,在出现的数据列表中选择”Landsat”,并勾选自己想要下载的数据集

_images/DataSet.png

  1. 数据集确定后,点击”Result”,即可查看查询结果;若想根据云量等继续筛选影像,点击”Additional Criteria”设置筛选条件

_images/Result.png

  1. 查询结果如图所示,在每幅图像下点击下载符号即可进行下载

_images/Download.png

数据处理

ASTER数据格式主要为HDF,可使用ENVI软件打开

 

 

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吾爱地理 » ASTER系列数据下载方法
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