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明确了航空相片土壤判读的理论依据之后,需要进一步探讨在航空相片上识辨土壤所根据的具体指标,以及进行土壤判读时应该遵循的原则。在“土壤航测制图的工作方法”一文(载本刊1964年第2期)中,曾分别对裸露土壤、覆盖了自然植被的土壤和生长了作物的土壤如何进行判读,做了简略的叙述。概括起来,在航空相片上判读各种土壤的方法不外乎直接判读和间接判读二种。直接判读法所依据的标志称为直接判读标志,间接判读法所依据的标志称为间接判读标志。
After clarifying the theoretical basis for soil interpretation of aerial photos, we need to further explore the specific indicators on which soil can be identified on aeronautical photographs and the principles to be followed when conducting soil interpretation. In “Working Methods of Soil Mapping” (contained in the journal Issue 2 of 1964), a brief account was made of how bare soil, soils covered with natural vegetation, and soils growing crops, respectively, have been interpreted. To summarize, there are no more than two ways of interpreting various kinds of soil in aerial photographs: direct interpretation and indirect interpretation. Direct interpretation of the law is based on the mark known as the direct interpretation of the mark, the indirect interpretation of the law is based on the mark known as indirect interpretation mark.