| At present,the method of manual visual judgment is used in remote sensing investigation on saline soil of arable land in Xinjiang.It can be described as: with the investigation on soil as the basis,the hazard of saline soil to crops as the interpretation key,the depth of ground water as the dynamic symbol,to make comprehensive interpretation and judgment.The relevant interpretation indexes are the indexes of crop seedling missing,crop growth vigor,features of geographical landscape,depth of ground water,etc.The results of this method have been approved by many experts in the field,which proves that manual visual judgment is suitable in arid saline areas in Xinjiang.However,whether it is adaptable to other regions needs further study. |