电脑桌面
添加小米粒文库到电脑桌面
安装后可以在桌面快捷访问

试验七ENVI软件介绍

试验七ENVI软件介绍_第1页
1/10
试验七ENVI软件介绍_第2页
2/10
试验七ENVI软件介绍_第3页
3/10
实验七ENVI 软件介绍目的:初步认识遥感数字图像处理软件ENVI ,了解 ENVI 的组成;掌握TM 、ETM+ 数据的ENVI 读取;认识ENVI 的数据文件;掌握辐射亮度和反射率的计算。实验原理:关于头文件的解读, 传感器记录的数据, 遥感的基本物理量, 辐射亮度与DN 值之间的关系。Use Landsat TM calibration to convert Landsat TM or ETM digital numbers to radiance or exoatmospheric reflectance (reflectance above the atmosphere) using published post-launch gains and offsets (see http://landsat7.usgs.gov/cpf/cpf.php and http://edcftp.cr.usgs.gov/pub/metadata/satellite/landsat7.tar.gz). The spectral radiance (Ll) is calculated using the following equation: where QCAL is the calibrated and quantized scaled radiance in units of digital numbers, LMINl is the spectral radiance at QCAL = 0, LMAXl is the spectral radiance at QCAL = QCALMAX, and QCALMAX is the range of the rescaled radiance in digital numbers. LMINl and LMAXl are derived from tables provided in the Landsat Technical Notes (August 1986) with the information provided through the TM Calibration Parameters dialog in ENVI. QCALMAX is 255 for all TM data and 127 for all MSS data except Band 4 (0.8 to 1.1 mm), which is 63 for certain time periods (data acquired before February 1, 1979 for Landsat 1-3 and processed before October 22, 1982). The resulting radiance (Ll) is in units of watts per square meter per steradian per micrometer (W/(m2*sr*mm)). The exoatmospheric reflectance (rp) is calculated using the following equation: where Ll is the spectral radiance, d is the Earth-Sun distance in astronomical units, ESUNl is the mean solar exoatmospheric irradiance, and qs is the solar zenith angle in degrees. ESUNl is derived from tables provided in the Landsat Technical Notes (August 1986). The resulting reflecta...

1、当您付费下载文档后,您只拥有了使用权限,并不意味着购买了版权,文档只能用于自身使用,不得用于其他商业用途(如 [转卖]进行直接盈利或[编辑后售卖]进行间接盈利)。
2、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。
3、如文档内容存在违规,或者侵犯商业秘密、侵犯著作权等,请点击“违规举报”。

碎片内容

试验七ENVI软件介绍

确认删除?
VIP
微信客服
  • 扫码咨询
会员Q群
  • 会员专属群点击这里加入QQ群
客服邮箱
回到顶部