On Wed, Dec 18, 2019 at 2:08 PM Clifford Snow <[email protected]> wrote: > > How should eelgrass[1] be tagged? I see that wetland=reedbed [2] has been > used in tidal areas mainly in Europe but also in the US but they are two > different plants.
Perhaps wetland_class=emergent or wetland_class=aquatic_bed? (How does the eelgrass grow in the area you're considering?) Thus saith 'Classification of Wetlands and Deepwater Habitats of the United States' (https://www.fws.gov/wetlands/documents/classwet/index.html): https://www.fws.gov/wetlands/documents/classwet/emergent.htm : Definition. The Emergent Wetland Class is characterized by erect, rooted, herbaceous hydrophytes, excluding mosses and lichens. This vegetation is present for most of the growing season in most years. These wetlands are usually dominated by perennial plants. All water regimes are included except subtidal and irregularly exposed. https://www.fws.gov/wetlands/documents/classwet/aquatic.htm Definition. The Class Aquatic Bed includes wetlands and deepwater habitats dominated by plants that grow principally on or below the surface of the water for most of the growing season in most years. Water regimes include subtidal, irregularly exposed, regularly flooded, permanently flooded, intermittently exposed, semipermanently flooded, and seasonally flooded. Aquatic beds further divide into algal (e.g., kelp, rockweed, stoneword), moss (e.g. Fisseidens, Fontinalis), rooted vascular (Zostera would fall in this category), and floating vascular (duckweed, water lettuce, water hyacinth, water-nut (Trapa), water fern (Salvinia), bladderwort, and so on). Rooted vascular aquatic beds occur in marine, estuarine, riverine, lacustrine and palustrine systems Some species, such as the water lily Nuphar luteum, are hard to classify between 'aquatic bed' and 'emergent', since it usually grows as lily pads, but occasionally stands erect above the water surface. Some of the eelgrasses have the same difficulty in classifying. The categories are always going to be fuzzy around the edges. USFWS would therefore label your eelgrass bed - if I understand correctly what you're trying to label - as "Marine, subtidal, aquatic bed, rooted vascular" while a typical reedbed might be "palustrine, emergent wetland, persistent, dominant vegetation Phragmites spp." and a typical alder meadow near me could be "palustrine, scrub-shrub wetland, broad-leaved deciduous, predominant plant Alnus spp." I have Absolutely No Idea how to fit a classification scheme like Cowardin's into a 'folksonomy' like OSM's. -- 73 de ke9tv/2, Kevin _______________________________________________ Tagging mailing list [email protected] https://lists.openstreetmap.org/listinfo/tagging
