Impervious Surface 2021

The Impervious Surface 2021 dataset is a collection of polygon features derived from Calgary Digital Aerial Survey mapping linework which have been determined as impervious. Impervious surfaces are defined as any material which will seal the soil surface, impede water infiltration, collect solar heat or deprive tree or vegetation roots of aeration. Impervious surfaces effect many aspects of our City, including storm run off volumes, pollutant concentrations and drainage. The City must understand and manage the amount of impervious surfaces carefully to ensure the ongoing health and vitality of the municipality and the environment. To learn more about other DAS products available, visit <a href="https://www.calgary.ca/maps/digital-aerial-survey.html">Digital Aerial Survey</a>

《不透水表面 2021 数据集》系由卡尔加里数字航空调查测绘线划生成的多边形要素集合，经鉴定均为不透水类型。所谓不透水表面，是指任何能够封闭土壤表面、阻碍水分渗透、聚集太阳能或剥夺树木或植被根系通风的物质。不透水表面会对城市诸多方面产生影响，包括暴雨径流量、污染物浓度以及排水系统。为确保市政及环境的持续健康与活力，城市必须谨慎理解和管控不透水表面的数量。欲了解更多可用的数字航空调查产品信息，请访问<a href="https://www.calgary.ca/maps/digital-aerial-survey.html">数字航空调查</a>。