Service Description: The bottom type map was used to make bottom classification maps that incorporated benthic community indicators. Organism density maps plot the total number of individuals per meter squared. The species diversity is the total number of species at any site. Combining the geological surface map with the OSI and organism density map produces the bottom classification map. Based on detailed mapping and analysis of the many biologic indicators measured or observed in our SPI analyses, e4 determined that the biologic parameters that best captured benthic community environments in the study region were OSI (in part because it incorporates so many key biologic indicators), aRPD, and overall species diversity. After detailed examinations of these parameters, we determined that OSI best and most simply captured all relevant information on the health of the benthic communities sampled in this study. In our final bottom classification maps, the key biologic indicator of OSI is shown overlain on our geologic and sediment-type maps. e4 created a final bottom classification map based on all of the data that we acquired. We examined the Bell et al. (2004) and Flood and Cerrato (2010) approaches. We found that their approach would not honor all of the data or accurately represent the sediment type. e4 made extensive use of its boring database throughout New York harbor. We improved the technique by combining the sediment classification and OSI results for benthic communities, producing an ata-glance association between benthic community stress, location in the harbor, and sediment type
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Description: e4 combined sub-bottom and side-scan datasets using manual and automatic data processes to characterize the type and extent of sediments throughout NY Harbor and the Lower Hudson River. e4 produced a map of the sediment types exhibited on the bottom surface of the harbor using sub-bottom results. These results were tied to grain size analyses from grab samples collected in the study area and to side-scan evidence of anthropogenic materials. In combination, these results provide a comprehensive picture of sediment type and environment within the study region. These geologic surface maps formed a basis of e4âs bottom classification maps in each area.
Copyright Text: New York City Department of Environmental Protection
Spatial Reference: 26918 (26918)
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Spatial Reference: 26918 (26918)
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