Improving county access to high-resolution imagery

作者：琳达·达菲（Linda Duffy）

作为订阅者HxGN Content Program通过华盛顿州，农村Jefferson Countyin the United States benefits from access to the most current high-resolution aerial imagery available. Highly useful decision-support tools are created by overlaying the imagery with detailed county-wide GIS data. The insights obtained from combining information lead to more-informed analysis, faster approval processes and better services to internal and external customers.

Unique county characteristics

Jefferson County encompasses a diverse geographic area, which presents special challenges for government administrators. Located on the Olympic Peninsula, the coastline along the Pacific Ocean forms the western border of the county, while the eastern section includes four small towns, a shipping port, several islands, farmland and an active naval facility. In between West Jefferson County and East Jefferson County lies Olympic National Park and Olympic National Forest, managed by the federal government. In total, about 31,000 residents are dispersed over 5,654 square kilometres.

Due to the varied terrain and long distance from the county seat of Port Townsend in the east to the Pacific coast in the west, onsite inspections can be time consuming and expensive, causing delays in building permit approvals, infrastructure planning and environmental protection efforts. Government and private users both benefit fromup-to-date aerial imagery因为它提供了感兴趣领域及其周围的详细信息和reduces the need for in-person field visits.

“借助空中图像，我们可以看到结构，附属建筑和自然特征，当与轮廓结合使用时，我们可以从办公室做出很多决定，”Jefferson County Central Services的GIS分析师/制图师Kevin Hitchcock说。“在像我们这样的农村社区中，在线地图用于各种活动，例如规划新的发展以及评估对溪流和湿地的影响。公共土地记录数据库还包括该县每个物业的销售历史记录和其他信息，从而轻松进行研究而无需离开办公室。”

Improved basemap

In 2015, counties and municipalities throughout the State of Washington were approached to assess their interest in成本分配以获得高分辨率的航空影像of the entire state. A certain level of participation from local jurisdictions was necessary to make it cost effective. In Jefferson County, department managers and administrative staff agreed that signing up would be beneficial. Ultimately the county entered into a three-year contract toreceive imagery through the HxGN Content Program.

HXGN内容计划收集了美国，欧洲部分地区和加拿大人口稠密地区的投机现成的矫正图像，以创建可供客户使用的数据库。目标是获取cloud-free 30-centimetre resolution, 4-band imagery over less populated areas, and 15-cm resolution over metro areas with a population greater than 50,000. In 2017, Jefferson County received30-cm resolution aerial imagery，对2011年通过国家农业图像计划（NAIP）获得的1米基台的欢迎更新。

杰斐逊县中心的目标Services GIS team is to develop and maintain an effective countywide resource that serves the needs of government agencies and the public. Historical and current imagery and GIS data layers are available for viewing and printing through an Esri ArcGIS web application. An imagery map service hosted byValtus，六边形的一部分，允bob体育报道许用户将内容作为图层添加到任何GIS Webmap。公众可以下载现有的ShapeFiles，例如税收包裹，但不能下载实际图像。政府雇员有权下载图像以创建衍生产品并进行分析。bob综合app下载

Benefits to the community

Jefferson County has created auser-friendly GISthat contains a broad range of information. The online map archive includesrich data layers such as zoning, fire districts, school districts, roads, emergency services, and channel migration zones overlaid on the high-resolution imagery.

在县内，空间和地图信息的经常用户包括环境卫生部门，公共工程，社区发展和评估员。紧急响应者（例如警察和消防员）得到了地址点层的帮助，以查明最快的方式来吸引有需要的人，而私营部门的工程师可以更轻松地设计化粪池系统analysing online data. For shoreline properties, developers check for extra regulatory restrictions to ensure compliance with proximity to shoreline and erosion concerns.

“通过HXGN内容程序访问高分辨率的航空影像，使您可以更轻松地在周围地形的详细和更广泛的背景下可视化感兴趣的领域，”says Hitchcock.“We save time and money by completing our work with online tools. As we continue to explore the applications, there will probably be a desire for even higher resolution to support better decision making.”