Building Footprints 2021 Yavapai County

The Buildings 2021 originally started using prior 2019 data and updated it for 2021. These building footprints are outlines of physical structures in Yavapai County. The outlines were extracted three sources; Lidar Level 1 USGS 3DEP September 2021 flights. Other data supplement from City of Prescott Lidar footprints, some Overheld digitizing using November 2021 Vexcel imagery, and using County Assessor Salvaged account data to look for buildings that have been removed. This is the first year the County Assessor Salvaged account data was added to the workflow to evaluate missing structures or to delete existing footprints. Prior 2019 building footprints were collected from the NAIP Imagery extracted from the June/July 2019. This feature class contains building footprints from three data sources:</p><p>LIDAR-derived building footprints from 2021<br><br>City of Prescott building footprints from 2020</p><p>Yavapai County building footprints from 2019</p><p>To create this feature class, a GIS specialist combined data from the three sources listed above.</p><p>The visibility scale for this feature class ranges from 1:5,000,000 (min) to 1:5,000 (max)<span>.</span></p><p></p><p><span>Elevated objects such as roof outlines in aerial imagery may appear displaced with respect to the base of the structure. The orthophotos are spatial referenced by the data collector therefore orthophotos could be off much as +/- 12 feet. Elevated features like tops of buildings are not rectified to their true horizontal position. This offset of the tops of buildings appears as building lean. While the intent of orthophotos is to look straight down, virtually all the displayed orthophoto locations are photographed at some angle. This data is not accurate to survey standards. This product is for informational purposes and may not have been prepared for, or be suitable for legal, engineering, or surveying purposes.2021年建筑数据集（Buildings 2021）最初基于2019年的历史数据构建，并于2021年完成更新。本数据集涵盖亚瓦派县（Yavapai County）内实体建筑的物理轮廓数据。该建筑轮廓数据源自三类数据源：其一为2021年9月美国地质调查局（USGS）3DEP项目的一级激光雷达（Lidar Level 1）飞行采集数据；其余补充数据包括普雷斯科特市（City of Prescott）的激光雷达建筑轮廓数据、2021年11月基于Vexcel影像完成的部分叠加数字化成果，以及县评估员办公室的已注销建筑账户数据（County Assessor Salvaged account data），用于识别已拆除的建筑。这是首次将县评估员已注销建筑账户数据纳入数据处理流程，用于核验缺失的建筑或删除已失效的建筑轮廓。 2019年版的建筑轮廓数据则依托2019年6-7月采集的美国农业航空影像计划（National Agriculture Imagery Program, NAIP）影像提取得到。本要素类（feature class）包含三类数据源的建筑轮廓数据： 1. 2021年激光雷达衍生建筑轮廓数据 2. 2020年普雷斯科特市建筑轮廓数据 3. 2019年亚瓦派县建筑轮廓数据 本要素类由地理信息系统（GIS）专员整合上述三类数据源制作而成。本要素类的显示比例尺范围为最小1:5,000,000至最大1:5,000。 航空影像中的屋顶轮廓等高程物体，可能会相对于建筑基底出现位移偏差。本数据集所采用的正射影像（orthophoto）由数据采集者进行空间配准，因此其位置误差可达±12英尺。建筑顶部等高程特征未被校正至真实水平位置，这种顶部偏移会表现为建筑的倾斜视觉效果。尽管正射影像的采集初衷为垂直向下拍摄，但实际展示的所有正射影像均为一定角度下的拍摄成果。本数据未达到测绘规范精度要求。本数据集仅作信息参考用途，未为法律、工程或测绘相关用途专门编制，亦不适用于此类场景。