摘要
在假定GMS-4地球静止卫星所发定位网格数据的精度满足要求的基础上,通过数学原理分析、改变二维插值顺序、比较插值结果与实际分布等手段,对比分析了利用线性和非线性插值方法给每一个象点定位的结果。发现非线性插值所得结果明显优于线性插值,更加符合实际情况。线性插值的误差在经度方向上较小,可以忽略,但是在纬度方向的误差,即经度误差极为明显。在星下点的左上部,误差由东南向西北迅速增大。有相当一部分地区内经度误差大于2个象点;最大误差在475°N,90°E处,大于4个象点。
Supposing the accuracy of the grid data for navigation sent by the geostationary satellite GMS-4 is acceptable, location methods are analysed and compared by means of mathematic principle, the sequence of 2-dimension interpolation, and the effect of location. It is discovered that non-linear interpolation have an advantage over the linear interpolation. Error produced along the longitude from linear interpolation is small so that it is reasonable to omit it. But the error along the latitude is very obvious. In the region between 90 ° -120 ° E, and 0 ° -50 ° N error increases from southeast to northwest. This error is greater than 2 pixels in most of the area. The maximum is greater than 4 pixels, located at 47.5 ° N, 90 ° E.
出处
《高原气象》
CSCD
北大核心
1993年第4期392-399,共8页
Plateau Meteorology
关键词
卫星云图
象点
定位
误差
Satellite cloud picture
Pixel
Location
Error
Non-linearity.
