As aerial remote sensing becoming a more and more important way for obtaining high resolution data, an effective method for evaluate the remote sensing task should be provided. The shadow map technology is a process by which shadows are added to 3D computer graphics. As the shadows can be treated as the blind spots of the remote sensors, so the shadow map technology was integrated to the evaluation method. It can show the blind spots of the planned task immediately to the user and is meaningful for aerial remote sensing. People can adjust the planned task according to the evaluated result to avoid wasting time and money.