中红外和热红外在测算水稻种植面积上的应用

在利用ＡＶＨＲＲ数据测算水稻种值面积中，对ＡＶＨＲＲ各通道数据进行统计特征分析和影象线性拉伸处理，发现其中红外（ＣＨ３）和热红外（ＣＨ４）通道信息量丰富，且在中红外和热红外拉伸影象上存在稻田的这温较旱地低－“稻区低温”现象。因此，在测算水稻种植面积时，半加了第３、４两通道－中红外和热红外通道。实际应用证明：增加两红外通道非常有助于水稻鉴别。

Estimation of rice planting area by virtue of NOAA/AVHRR thermal infrared data

Statistical analysis and image linear stretching have been performed for each AVHRR channel for rice planting area estimation. Besides two traditional crops monitoring channels 1 and 2, Channels 3 and 4 (thermal infrared) are employed in the study for the latter ones are also rich in information and their stretched images present lower brightness temperatures for rice than for rain fed fields. Results show that the additional channels are helpful to rice identification in combination of the traditional visible and near infrared channels.