应用热惯量编制土壤水分图及土壤水分探测效果

利用可见一近红外多光谱扫描图象和热红外日、夜扫描图象可以生成土壤反照率图和土壤日夜温差图,再利用室內测定的少量土壤热惯量资料对室外同步测定的土壤反照率和日夜温差进行二元回归,可得二元回归方程。借助此回归方程和所生成的土壤反照率图和土壤温差图可以生成真实土壤热惯量图。再利用土壤热惯量对土壤水分的回归方程,可将真实土壤热惯量图变成土壤水分图。这种土壤水分图反映出的土壤水分含量误差范围为-4.18%至1.98%,误差绝对值平均数为1.84%。

COMPILATION OF SOIL MOISTURE MAP BY MEANS OF SOIL THERMAL INERTIA IMAGE

With the visible-infra-red multispectral scanned images and the scanned day and night thermal images,the soil albedo image and the day-night thermal image can be done.With a few soil thermal inertia data measured in laboratory,the corresponding soil albedo and day-night temperature difference were measured synchronously in fields,through dualistic regression,a dualistic cubic formula was obtained.Using this equation and the soil albedo image and the soil temperature difference image,a soil thermal inertia image was obtained.Then the soil thermal inertia image was transformed into a soil moisture map,with the aid of regressing the soil thermal inertia to the coil moisture.The error of the soil moisture map ranged from -4.18% to 1.98%,the mean absolute value of the errors was 1.85%.