idl获取影像面积

在使用envi中的band_math时需要将两张图像设置为相同的行和列，改程序解决了该问题(In use of envi band_math need two images set to the same rows and columns, change the program to solve the problem)

利用idl写的根据遥感影像自动匹配的自动校正，调用envi自带函数envi_auto_tie_points_doit envi_register_doit(Use of remote sensing image idl write according to automatic matching of automatic correction, call envi bring their own function： envi_auto_tie_points_doit envi_register_doit)

IDL编程技术一书，主要介绍了IDL语言基本规则与语法，是一本入门的基础书籍(IDL programming techniques the book, mainly introduce the basic rules of the IDL language and grammar is the basis of a book entry)

这些代码主要是IDL语言源码，主要功能：初始化ENVI,定标,大气校正,融合,镶嵌,裁剪,分类(监督+非监督),面向对象特征提取,结束ENVI(These codes are mainly IDL language source code, the main functions: initialization, ENVI, calibration, atmospheric correction, fusion, mosaic, cutting, classification (supervision + non supervision), object oriented feature extraction, ending ENVI)

可评价影像融合质量，信息熵、标准差、相关系数等(Evaluable image fusion quality, information entropy, etc.)

说明：  idl调用envi函数实现对地表温度的反演(IDL calls envi function to realize the inversion of surface temperature)

说明：  idl读取nc文件，并按照经纬度提取nc文件中的变量，写入txt(IDL extract NC file)

关于遥感影像分类和变化检测的一本外文数据，其特色在于用IDL实现了很多经典算法，很值得借鉴！(Foreign language data on a remote sensing image classification and change detection, which feature IDL achieve many classical algorithm, it is worth learning!)

说明：  IDL读取txt，txt第一列是纬度，第二列是经度，第三列是DN值， 坐标转行列号 ，并以图像的形式输出(IDL reads TXT. The first column of TXT is latitude, the second column is longitude, and the third column is DN value. The coordinate turns the line and column number and outputs it in the form of image)

说明：  利用二分法模型，利用NDVI提取置信区间计算植被覆盖度(Calculation of vegetation coverage by dichotomy)