Building Structures (2-D) (Feature Service)

This dataset consists of 2-dimensional roof outlines ("roofprints") for all buildings larger than 150 square feet for all of Massachusetts. MassGIS manages the layer and updates the data from newer aerial imagery as it becomes available. The features were initially interpreted by a contractor (Rolta) for the entire Commonwealth using color, 30 cm. DigitalGlobe ortho images obtained in 2011 and 2012, supplemented with LiDAR (Light Detection And Ranging) data collected from 2002 to 2011 for the eastern half of the state. In 2019, MassGIS refreshed the data to a baseline of 2016 and continues to update features using newer aerial imagery that allows MassGIS staff to remove, modify and add structures to keep up with more current ground conditions. Structures from the original compilation that are removed are stored in an "archive" feature class for edit tracking and historical purposes. Also in 2019, MassGIS replaced the polygons in Boston with data from the city. In March 2021, the layer was updated with 2017 and 2018 structure review edits along with the first data edits compiled atop spring 2019 imagery. In July 2021, MassGIS completed the statewide update based on 2019 imagery. In September 2022, MassGIS completed the statewide update based on 2021 imagery. MassGIS made further edits based on 2021 imagery during 2023. In December 2025, MassGIS made edits on portions of Cape Cod using spring 2025 imagery. See full metadata. Map service is also available.本数据集包含马萨诸塞州全域所有面积大于150平方英尺的建筑的二维屋顶轮廓（roofprints）。马萨诸塞州地理空间信息系统（MassGIS）负责管理该数据集图层，并会在获取新的航空影像后及时更新数据。 该数据集的要素最初由承包商Rolta为整个马萨诸塞州解译完成，解译时采用2011至2012年获取的30厘米分辨率彩色DigitalGlobe正射影像，并辅以该州东部区域2002至2011年采集的激光雷达（LiDAR，Light Detection And Ranging）数据。 2019年，MassGIS将数据基准更新至2016年，并持续通过新获取的航空影像更新要素，工作人员可借此移除、修改或新增建筑要素，以贴合最新实地现状。原始整合数据中被移除的建筑要素会被存储于"archive"（存档）要素类中，用于编辑追踪与历史留存。 同年（2019年），MassGIS将波士顿区域的多边形要素替换为该市官方提供的数据。2021年3月，该图层基于2017与2018年的建筑要素审核编辑结果，以及基于2019年春季影像生成的首批数据编辑内容完成更新。2021年7月，MassGIS基于2019年航空影像完成全州范围数据更新；2022年9月，其又基于2021年航空影像完成全州范围数据更新。2023年，MassGIS基于2021年航空影像开展了额外编辑工作。2025年12月，MassGIS基于2025年春季影像对科德角部分区域的要素进行了编辑。 完整元数据请参阅官方文档，该图层同时提供地图服务。