摘要
文文在对ＮＯＡＡ－ＡＶＨＲＲ像元畸变特点分析和ＩＢ格式中的定位数据质量评价基础上，确定ＩＢ格式中的定位数据。尽管绝对精度很差，但相对精度较好，可以用来进行像元的相对定位，确定像元的大小和形状，在此基础上，提出了ＮＯＡＡ－ＡＶＨＲＲ像元畸变校正方法。校正后的图像经多项式纠正后，多时相复合和与辅助数据相复合的效果很好，误差为半个像元级。
There are different methods for geometric correction of NOAA AVHRRdata,but these methods pay less attention to the accuracy, or are technical complex,almost unsuitable for most users.When combining AVHRR data with other highresolution satellite data,or with precise ancillary data,it is necessary to develop aaccurate geometric correction method,which should be easy to use for non- profes-sional users.After analyzing the pixel shape and size of AVHRR data along scan line andevaluating the quality of geographic data within NOAA AVHRR 1B data set,it isclear that the geographic data have a very high accuracy for identify the pixel sizeand shape.The proposed method has two steps.The first step is the correction of distortedpixel.The separate program performs the distortion correction,applying the geog-raphic data of AVHRR 1B data set to assign the value of each pixel of the desiredoutput geographical area with given pixel size,and doing logical judgment for un- assigned pixels.The second step is the conventional polynomial transformation.An application of this method is presented,in which AVHRR data are integra- ted over multi-temporal data and 1∶50,000 river map with half-pixel accuracy.
出处
《环境遥感》
CSCD
1994年第4期287-295,T001,共10页
关键词
像元畸变校正
遥感
卫星数据
几何纠正
误差
Geometric Correction,NOAA AVHRR 1B Dataset,Distorted Pixel correction
