Waterline and Coastal Features 2025

Overview This feature service provides detailed line features representing various water-related structures and streams within the Cape Cod region, based on high-resolution aerial imagery acquired in spring 2025. The data reflects updates and new additions to an existing planimetric dataset with a high positional accuracy suitable for mapping at a 1:40,000 scale. Feature Layer Waterline Features: This primary layer includes multiple types of waterlines such as coastlines, streams (perennial and intermittent), canals, levees, dams, bridges, and various coastal structures like jetties, groins, and revetments. Each feature is cataloged with hydrological identifiers, flow direction, and detailed classification based on the USGS National Hydrography Dataset, supporting both cartographic and hydrological analyses. Geographic Coverage This dataset is specific to the Cape Cod area, Massachusetts, and covers coastal and inland waterline features as seen in the spring 2020 aerial imagery. Data Collection and Quality The data was produced by NV5 under the Cape Cod Commission's funding, utilizing 7.5 cm ground sample distance imagery collected under optimal conditions (leaf-off, snow-free, minimal atmospheric disturbances) between February and April 2025. The dataset ensures high horizontal positional accuracy (within 0.38 meters at 95% confidence), suitable for detailed environmental monitoring and planning. Applications Environmental and hydrological studies focused on coastal and stream features. Mapping and management of water resources and coastal infrastructure. Local government planning and conservation efforts in the Cape Cod region.概览 本要素服务基于2025年春季采集的高分辨率航空影像，提供科德角（Cape Cod）区域内各类涉水构筑物与溪流的详细线状要素。本数据集为现有平面测量数据集的更新与增补内容，具备较高的位置精度，可满足1:40000比例尺的制图需求。 要素图层：水线要素 本核心图层包含多类水线要素，涵盖海岸线、常年与季节性溪流、运河、堤防、水坝、桥梁，以及防波堤、丁坝、护岸等各类海岸构筑物。所有要素均配备水文标识符、流向信息，并依据美国地质调查局（USGS）国家水文数据集（USGS National Hydrography Dataset）完成详细分类，可同时支持制图与水文分析工作。 地理覆盖范围 本数据集仅限马萨诸塞州科德角区域，涵盖2020年春季航空影像中呈现的海岸与内陆水线要素。 数据采集与质量控制 本数据集由NV5公司在科德角委员会（Cape Cod Commission）资助下完成，采用2025年2月至4月期间采集的7.5厘米地面采样距离（Ground Sample Distance, GSD）影像，采集条件为最优状态：无叶期、无积雪、大气干扰极小。数据集的水平位置精度优异，在95%置信度下误差不超过0.38米，适用于精细化环境监测与规划工作。 应用场景 1. 聚焦海岸与溪流要素的环境及水文研究； 2. 水资源与海岸基础设施的测绘与管理； 3. 科德角区域的地方政府规划与生态保护工作。