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Layer: Morphological_Features (ID:2)

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Name: Morphological_Features

Display Field: GeoClass

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: During October-November 2018 and July 2019, high-resolution acoustic and photographic data to identify and map sediment grain size fractions and texture of the UCR sediment bed in the AOIs was collected as described in the Phase 3 Sediment Facies Mapping Quality Assurance Project Plan (QAPP). The general workflow is as follows (see Figure 1-1 in accompanying technical memorandum for more information):Raw field data were acquired at AOIs as described in the Phase 3 Sediment Facies Mapping QAPP.Field data were processed for each AOI to create a bathymetry DEM (from MBES data), an acoustic backscatter mosaic (from MBES data), and sediment bed composition data (from underwater imagery).Postprocessed MBES data were spatially and statistically analyzed to produce terrain and texture statistics from bathymetry and acoustic backscatter, respectively. During segmentation, grid cells with similar terrain and texture statistics are grouped together to create polygon objects, which allows analysis to be performed using an object-based approach rather than a pixel-based approach.During classification, objects are related to ground reference data to develop a relationship between backscatter/bathymetry statistics and sediment bed composition. Ground reference data, which describes sediment composition or bed characteristics at point locations, was prepared from interpreted underwater imagery.After developing the classification relationship, a reserved subset of ground reference data are used to perform an accuracy assessment to validate the classification. The classification step is repeated using different approaches until a classification is produced that passes the accuracy assessment.The classification is then applied to backscatter and bathymetry data to produce a polygon dataset showing percent of sediment grain size fractions (mud, sand, gravel, boulders/cobbles). The polygons provide the framework for mapping any combination of sediment textures.A project-specific sediment classification system defining surface sediment facies (sediment bed types) was developed as a sediment texture triangle. The sediment classification system, which is described in the next section, was tailored to UCR conditions and to support development of a sediment sampling campaign.The sediment classification system was applied to the sediment composition polygons at each AOI to produce draft surface sediment bed facies maps to be used to support the design of subsequent sediment sampling studies.INTERIM DATA NOT APPROVED BY EPA.

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Supported query Formats: JSON, geoJSON, PBF

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Object ID Field: FID

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Type ID Field: GeoClass

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Last Edit Date: 9/17/2024 5:13:34 PM

Schema Last Edit Date: 9/17/2024 5:13:34 PM

Data Last Edit Date: 9/17/2024 5:13:34 PM

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