With the crop estimation for winter wheat in Tianjin City area as a model

this paper elucidates the Application feasibility of NOAA/AVHRR information to predict the crop in small and medium sized area. In data analysis

spectroscopic values obtained from water surface are used to correct atmospheric factors

and the geographic contour map is used to eliminate confused factors

thus the data tend to be stabilized. By utilizing the vegetation index and yield factor

some regression equations for forecast are suggested with the green values corrected according to different area and integrated temperature. Then

an accuracy of 95% for forecast may be obtained.