等量线 meaning in Chinese

equal volume contour
equality line
isobar
isocontour
isograd
isogram
isoline

Noise exposure forecast contour
飞机噪音预测等量线
Image of noise exposure forecast contours for new chek lap kok airport and old kai tak airport
图表：赤角新机场及启德机场的噪音预测等量线
In order to scientisfic classification , according to four diffierent standards , the classifications of thematic maps form were put forword . visual effect scheme including line form , image form and three - dimensional form . map layout scheme including main unit form and multi - unit form . scheme of generalization degree of contents , it contains analytical form and integrated form including compound form and synthetic form . scheme of conetnet framework and means of representation
为科学分类，依据4种不同标志，提出了专题地图4种分类方案：视觉感受方案：线划图型、影像图型和立体图型；图面结构方案：主单元和多单元图型；内容概括程度方案：综合与分析图型，其中综合图型又分组合型与合成型；内容结你与表示方法方案：等量线图型、向量线图型、统计图型、分布图图型、类型图图型和区划图图型。