Development Intensity Zones

The Development Intensity Zones (DIZ) geography as a block group-based assessment of existing development, largely formed from two analysis dimensions—density and proximity. Zones are classified from least to greatest development intensity. https://github.com/dvrpc/development-intensity-zones/blob/main/images/image.png Protected zones are within block group-based geographies but are removed from density and proximity index calculations. DIZ also uses the presence of structures (i.e. housing units, commercial and industrial square footage) to calculate these indices. The DIZ covers the 9-county DVRPC region, along with surrounding counties for greater context beyond the region. The DIZ can be used for a variety of purposes. It provides simple classifications of the region’s areas by which data can be summed and analyzed. It can be used for policy applications, such as incentivizing where future growth or investment goes based on smart growth principles. It’s important to note that the DIZ classifications are based on the current presence of development, largely using housing units for residential intensity and commercial square feet for non-residential intensity. This captures used space and space with potential for use (vacant space) and the presence of infrastructure to build buildings, but if one’s analysis is more suited for the presence of people, other metrics such as population, households, and employment may be more appropriate. If future growth in development is desirable for one’s analysis, the DIZ does not capture that. For more information, see Methodology. Version 1 release Sept. 2023开发强度分区（Development Intensity Zones, DIZ）地理数据集是一款基于街区组（block group）的既有开发状况评估工具，其构建主要依托开发密度与空间邻近性两大分析维度，分区按开发强度从低到高进行分级。https://github.com/dvrpc/development-intensity-zones/blob/main/images/image.png 受保护分区属于基于街区组的地理范围，但不计入密度与邻近性指数的计算流程。开发强度分区还通过建筑设施的存在情况——即住宅单元、商业与工业用地建筑面积——来计算上述指数。该数据集覆盖特拉华谷区域规划委员会（Delaware Valley Regional Planning Commission, DVRPC）所辖的9个郡，并纳入周边郡域以拓展区域外的分析语境。 开发强度分区可应用于多种场景：其通过对区域地块的简易分级，支持数据的汇总与分析工作；亦可服务于政策制定场景，例如依据精明增长（smart growth）原则，引导未来开发布局与投资方向。需特别说明的是，开发强度分区的分级基于当前既有开发状况，其中住宅开发强度以住宅单元数量为核心指标，非住宅开发强度则以商业建筑面积为核心依据。该数据集涵盖已使用空间、潜在可使用空间（即空置空间）以及可用于建筑建设的基础设施存在情况；但若分析目标聚焦于人口分布状况，则采用人口数、家庭户数与就业岗位等指标会更为合适。若分析需求涉及未来开发增长预测，则开发强度分区数据集无法提供相关信息。更多细节可参考《方法论》文档。该数据集V1版本于2023年9月发布。