作者认为,等值线图的命题形式有以下几种:据等高(深)线来判断地形地势,进行工程选址、估算工程量以及合理布局农业等;据等(积)温线来判断区域气(积)温分布特征,进行原因分析、判断季节与南北半球、农业规划等;据等压线来判断区域气压水平分布状况,绘制风向、判断风速、进行天气预报 The author believes that the proposition form of the contour map has the following types: According to the contour (deep) line to determine the terrain and terrain, the project site selection, the project volume and the rational distribution of agriculture; judged from the (product) temperature line Regional gas (mass) temperature distribution characteristics, carry out cause analysis, judgment seasons, and northern and southern hemispheres, agricultural planning, etc.; according to the isobaric line to determine regional air pressure level distribution, draw wind direction, determine wind speed, and conduct weather forecast