等值线的类型主要有等高线、等温线、等压线、等降水量线、等太阳辐射量线等,是某个地理要素(如海拔、温度、气压、降水量、太阳辐射量等)数值相同的各点的连线。通过对以等值线图为背景的试题的解答来考查学生的读图分析能力、综合推理能力与理论联系实际的能力等,是历年来高考考查的重点。在进行“等值线图”专题 The main types of isolines include contour lines, isotherms, isobaric lines, and other precipitation lines, and other solar radiation lines. It is a geographical element (such as altitude, temperature, pressure, precipitation, solar radiation, etc.). ) The connection of points with the same value. Through examination of the questions on the background of isoline graphs to examine students’ ability of reading graph analysis, comprehensive reasoning ability and the ability to connect theory with practice, etc., it is the focus of the college entrance examination over the years. In the “contour map” topic