归一化植被指数测量技术研究

归一化植被指数是反映农作物长势和营养信息的重要参数之一，根据该参数，可以知道不同季节的农作物对氮的需求量，对合理施用氮肥具有重要的指导作用．本文提出了一种由四个专门设计的光电探测器，直接得到归一化植被指数的测量方法，理论上证明了经过标定的测量装置无须现场校正就可得出归一化植被指数．实验结果表明，该测量技术能准确反映植物的颜色特征，与地物光谱仪测试结果不重合度小于5％．

A Measuring Technology for Normalized Difference Vegetation Index

Normalized Difference Vegetation Index (NDVI) is one of the important parameters that reflect the way crop is growing and nourishment information, the in-season fertilizer nitrogen requirement for crop can be known by it, it has been provided with a significant guidance for logical application of N fertilization. In this paper a novel method that can measure NDVI directly by four special photoelectric detectors is proposed and proved (in theory) the measure device by demarcated can get NDVI and not need calibration at scene. The result of experiment indicated the novel measurement can reflect the color characteristic of plant exactly. Compared with surface feature ASD FR2500 spectrum, the coincident of measure result below 5%.