改善县获得高分辨率图像

作者：琳达·达菲（Linda Duffy）

As a subscriber to theHxGN Content Programthrough the State of Washington, rural杰斐逊县在美国，从可用的最新高分辨率航空影像中受益。非常有用的决策支持工具是通过用详细的县范围内的GIS数据覆盖图像来创建的。通过组合信息获得的见解导致更有信息的分析，更快的批准流程以及为内部和外部客户提供更好的服务。

独特的县特征

杰斐逊县（Jefferson County）涵盖了一个多样化的地理区域，该地理区域为政府管理员带来了特殊挑战。太平洋沿线的海岸线位于奥林匹克半岛，形成了该县的西部边界，而东部地区包括四个小镇，一个运输港口，几个岛屿，农田和一个活跃的海军设施。在西杰斐逊县和东杰斐逊县之间，由联邦政府管理的奥林匹克国家公园和奥林匹克国家森林。总共约有31,000名居民分散了5,654平方公里。

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。

“With aerial imagery, we can see structures, outbuildings, and natural features, and when combined with contours, we can make a lot of determinations from the office,”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。”

改进的基础图

2015年，与华盛顿州各地的县和市政当局进行了评估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 to通过HXGN内容程序接收图像。

The HxGN Content Program collects speculative off-the-shelf orthorectified imagery of the US, parts of Europe, and populated areas of Canada to create a database available to customers. The goal is to acquire无云的30厘米分辨率，人口较少的区域的4波段图像，人口大于50,000的都会区和15厘米的决议。2017年，杰斐逊县收到30厘米分辨率的航空影像, a welcome update to its 1-metre basemap obtained in 2011 through the National Agriculture Imagery Program (NAIP).

The goal of Jefferson County Central 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 by瓦尔特斯, part of Hexagon, allows users to add the content as a layer to any GIS webmap. The public can download the existing shapefiles, such as tax parcels, but not the actual imagery. Government employees are authorised to download the imagery to create derivative products and to perform analysis.

Benefits to the community

杰斐逊县has created a用户友好的GISthat contains a broad range of information. The online map archive includes在高分辨率图像上覆盖的富裕数据层，例如分区，消防区，学区，道路，紧急服务和渠道迁移区域。

Within the county, frequent users of spatial and map information include the departments of Environmental Health, Public Works, Community Development and the Assessor. Emergency responders, such as police and firefighters, are aided by the address point layer to pinpoint the fastest way to reach someone in need, while engineers in the private sector can more easily design septic systems by分析在线数据。对于海岸线属性，开发人员检查是否有额外的监管限制，以确保符合与海岸线和侵蚀问题的距离。

“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，”希区柯克说。“我们通过在线工具完成工作来节省时间和金钱。当我们继续探索应用程序时，可能会有更高决议来支持更好的决策。”