marsh_veg_test_polygons_2026

THIS IS METADATA FROM THE ORIGINAL LAYER - This dataset represents salt marsh communities in the Northeast Atlantic coast. The classification was produced using National Agriculture Imagery Program (NAIP) multispectral imagery for areas where no DEM was available to complete the full classification. This dataset combined with "Tidal Marsh Vegetation Classification, DEM, Northeast U.S." provides a contiguous classification of tidal marsh cover types from coastal Maine to Virginia. The six distinct cover/community types identified are: 1. High marsh: Area flooded during spring tides related to the lunar cycle and dominated by Spartina patens, Distichlis spicata, Juncus gerardii, and short form Spartina alterniflora. Other species include Juncus roemerianus, Scirpus pungens, Scirpus robustus, Limonium nashii, Aster tenuifolius, and Triglochin maritima. 2. Low marsh:Area flooded regularly by daily tides and dominated by tall form Spartina alterniflora. 3. Salt pools/pannes:Depressed, bare areas with sparse vegetation cover and extremely high soil salinities. Generally, pools retain water between high tides while pannes do not. 5. Phragmites australis: A species of considerable management interest due to the invasive nature of an introduced form, especially in marshes with freshwater input, upland development, and/or increased nutrients. 6. Mudflat: Exposed muddy areas free of vegetation. 7. Open water (bordering cover type): Channels and bays leading to open ocean. Detailed zone descriptions, accuracy estimates for each cover type, and data limitation details are provided at https://nalcc.databasin.org/documents/documents/53ff96d6c2814d43aa92dc4948aa7d64/. For more information about the development of this layer please contact Mo Correll at [e-mail]. "Tidal Marsh Vegetation Classification, DEM, 3m, Northeast U.S.", "Tidal Marsh Vegetation Classification, no DEM, 3m, Northeast U.S.", and "DEM Difference in Tidal Marsh Vegetation Classification, 3m, Northeast U.S." are products of the Saltmarsh Habitat and Avian Research Program (www.tidalmarshbirds.org).本元数据源自原始图层——本数据集表征东北大西洋沿岸的盐沼群落。针对缺乏数字高程模型（DEM, Digital Elevation Model）以完成完整分类的区域，本分类基于美国国家农业影像计划（NAIP, National Agriculture Imagery Program）的多光谱影像生成。 本数据集与《美国东北部潮汐沼泽植被分类、数字高程模型》数据集结合后，可实现从缅因州沿海至弗吉尼亚州的潮汐沼泽覆盖类型连续分类。 本次识别出6种独立的覆盖/群落类型，分别为： 1. 高潮盐沼：仅在与月相周期相关的春潮期间被淹没，优势物种为Spartina patens、Distichlis spicata、Juncus gerardii及矮型Spartina alterniflora，伴生种包括Juncus roemerianus、Scirpus pungens、Scirpus robustus、Limonium nashii、Aster tenuifolius与Triglochin maritima。 2. 低潮盐沼：每日受潮汐周期性淹没，优势物种为高型Spartina alterniflora。 3. 盐池/盐洼：地势低洼的裸地区域，植被覆盖稀疏，土壤盐度极高。通常盐池在高潮位间隙会留存积水，而盐洼则无积水留存。 5. 澳大利亚芦苇（Phragmites australis）：该物种因引入种群具有入侵性而备受管理关注，尤其在存在淡水输入、高地开发或养分富集的沼泽生境中。 6. 泥滩：裸露的无植被覆盖的泥质区域。 7. 开阔水域（毗邻覆盖类型）：指通向外海的航道与海湾。 各覆盖类型的详细分区描述、精度评估结果及数据局限性详情，请参阅：https://nalcc.databasin.org/documents/documents/53ff96d6c2814d43aa92dc4948aa7d64/。 如需了解本图层的开发详情，请联系莫·科雷尔，邮箱：[e-mail]。 《美国东北部3米分辨率潮汐沼泽植被分类、数字高程模型》《美国东北部3米分辨率无DEM潮汐沼泽植被分类》及《美国东北部3米分辨率潮汐沼泽植被分类数字高程模型差值》均为盐沼栖息地与鸟类研究项目（Saltmarsh Habitat and Avian Research Program，www.tidalmarshbirds.org）的产出成果。