Choosing coastline as landmark is an important automatic image-based method for satellite navigation.The method selects a specific area in the remote sensing image

detects the coastline in it

and matches it with the corresponding region of the standard global coastline template library.The calculated offset determines how to adjust the posture of the satellite.Considering the characteristics of the automatic image navigation process

we propose a method to detect land and sea boundary in infrared channel of remote sensing images.The method

which is based on level set

is initialized by the standard template library and is equipped with region-scalable fitting energy model.The experimental results indicate that our algorithm has advantages in efficiency

stability and accuracy.