2016 Shoreline Structure Inventory

The NH Shoreline Inventory Project is an effort to create, for the first time, an important baseline dataset to inform coastal shoreline management decisions. Interest in NH integrated shoreline management has increased over the past few years among multiple stakeholder groups as the region is experiencing continuing population growth and development, water quality stresses, sea-level rise, and intensifying coastal storms. Following the December 2014 NH Shoreline Management Conference, several data needs were identified to help advance integrated shoreline management and policy that promotes important assets like human health and safety, natural resources, economic development, cultural and historic resources, and recreation opportunities, among others. One important data need is a comprehensive, spatial inventory of engineered structures along the New Hampshire shoreline that could be combined and compared with existing high quality data about natural habitats like salt marshes, sandy beaches, and natural rocky shores. This integrated dataset would be used to gain a better quantitative understanding of the state of the NH coastal shoreline, including the proportion of the shoreline that is subject to manmade hardened structures. New Hampshire Shoreline Inventory Project provides baseline information about existing engineered shoreline structures, including total spatial extent and coarse level information about type of structure. It also integrates information about key coastal habitats, including salt marshes, sandy beaches, and rocky shores. The engineered structures were digitized at a scale of 1:1500 using the 2013 Coastal High Resolution True Color aerial photograph collected by the Piscataqua Region Estuaries Project on August 24, 2013 (1-foot resolution) and the 2010-2011 Regional Very High Resolution Aerial Photography (6-inch resolution) available on NH GRANIT. The inventory includes enough detail to serve as the baseline/screening dataset for a more site specific inventory, a shoreline vulnerability assessment, and to identify candidate sites for "soft/living shoreline" approaches. It serves as an information source for decision-makers as they consider development of a Comprehensive NH Shoreline Management Plan and involves key experts in the Coastal Zone in order to ensure that the product is useful and usable. In 2025, this layer was reviewed to revise any inaccuracies from the original 2016 layer.新罕布什尔州海岸线清查项目（NH Shoreline Inventory Project）首次构建了一套重要的基线数据集，为沿海海岸线管理决策提供参考依据。过去数年，由于该区域持续面临人口增长与开发、水质压力、海平面上升以及愈发强烈的沿海风暴侵袭，多利益相关方群体对新罕布什尔州综合海岸线管理的关注度不断提升。2014年12月新罕布什尔州海岸线管理会议后，多项数据需求被明确，以推动综合海岸线管理与政策制定，保护人类健康与安全、自然资源、经济发展、文化历史资源以及休闲机会等重要资产。其中一项关键数据需求是，针对新罕布什尔州海岸线沿线的人工构筑设施开展全面空间清查，以便与盐沼、沙滩、天然岩岸等天然栖息地的现有高质量数据进行整合与对比。这套整合后的数据集将用于更精准地量化分析新罕布什尔州沿海海岸线现状，包括受人工硬质构筑物影响的岸线比例。新罕布什尔州海岸线清查项目提供了现有人工岸线构筑物的基线信息，涵盖总空间范围以及构筑物类型的概览数据，同时整合了盐沼、沙滩、岩岸等关键沿海栖息地的相关信息。该人工构筑物数据以1:1500的比例尺进行数字化，所用数据源包括2013年8月24日由皮斯卡塔夸地区河口项目采集的2013年沿海高分辨率真彩色航空影像（分辨率为1英尺），以及可在NH GRANIT平台获取的2010-2011年区域超高分辨率航空摄影资料（分辨率为6英寸）。本次清查数据集具备足够细致的粒度，可作为更精细化的特定场地清查、海岸线脆弱性评估的基线/筛查数据集，同时可用于识别“软质/生态型岸线”修复方案的候选场地。本项目可为决策者制定《新罕布什尔州综合海岸线管理计划》提供信息支撑，并邀请沿海地带的核心专家参与，以确保成果具备实用性与易用性。2025年，研究团队对该数据图层进行了复核，修正了2016年原始图层中存在的各类误差。