Excel · dataset · 2023
SF Bay Eelgrass (BCDC 2020)
Listed in California Open Data
This eelgrass layer includes the maximum extent of eelgrass beds that have been surveyed in the San Francisco Bay shown in green.
Description
It was created by merging the Bay-wide eelgrass surveys conducted by Merkel & Associates, Inc. (Merkel) in 2003, 2009, 2014, and a Richardson Bay survey conducted by Merkel in 2019.
Merkel has granted permission for public use of these data. These eelgrass surveys represent the best available data on comprehensive eelgrass extent throughout San Francisco Bay in 2021 and are developed using a combination of acoustic and aerial surveys and site-specific ground truthing. This layer may be used as a reference to determine potential direct and indirect impacts to eelgrass habitat from dredging projects.
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These data do not replace the need for site-specific eelgrass surveys. Data from the 2003, 2009, and 2014 eelgrass surveys and associated Merkel reports which include information on mapping methodology are available for download on the San Francisco Estuary Institute’s (SFEI) website . Methods for creating this layer are as follows: Downloaded the Merkel Baywide Eelgrass Surveys for 2003, 2009, and 2014 from SFEI and combined into a single layer.
Obtained original Richardson Bay 2019 eelgrass survey data from Merkel. Loaded all layers into ArcGIS Pro © ESRI and re-projected all data to the NAD 1983 UTM Zone 10N coordinate system. Ran union of both the SFEI and Richardson Bay 2019 layers.
Merged features to create one single attribute table for eelgrass cover from all survey years. Removed extraneous columns in the attribute table, recalculated area fields based on new extent, and applied symbology.
Links
Get the data
- Publisher page gis.data.cnra.ca.gov/datasets/BCDC::sf-bay-eelgrass-bcdc-2020 ↗
documentation · download · from data ca gov
- ArcGIS GeoService services2.arcgis.com/4Z9x989NrBVrvFwm/arcgis/rest/services/SF_eelgrass_BCDC_2020_si… ↗
download · from data ca gov
- CSV gis.data.cnra.ca.gov/api/download/v1/items/a228837905b345809c89e283556fe312/csv?lay… ↗
download · from data ca gov
- Shapefile gis.data.cnra.ca.gov/api/download/v1/items/a228837905b345809c89e283556fe312/shapefi… ↗
download · from data ca gov
- GeoJSON gis.data.cnra.ca.gov/api/download/v1/items/a228837905b345809c89e283556fe312/geojson… ↗
download · from data ca gov
- KML gis.data.cnra.ca.gov/api/download/v1/items/a228837905b345809c89e283556fe312/kml?lay… ↗
download · from data ca gov
- File Geodatabase gis.data.cnra.ca.gov/api/download/v1/items/a228837905b345809c89e283556fe312/filegdb… ↗
download · from data ca gov
- Feature Collection gis.data.cnra.ca.gov/api/download/v1/items/a228837905b345809c89e283556fe312/feature… ↗
download · from data ca gov
- Excel gis.data.cnra.ca.gov/api/download/v1/items/a228837905b345809c89e283556fe312/excel?l… ↗
download · from data ca gov
- GeoPackage gis.data.cnra.ca.gov/api/download/v1/items/a228837905b345809c89e283556fe312/geoPack… ↗
download · from data ca gov
- SQLite Geodatabase gis.data.cnra.ca.gov/api/download/v1/items/a228837905b345809c89e283556fe312/sqlite?… ↗
download · from data ca gov
Where it is published
- California Open Data dataset page data.ca.gov/dataset/sf-bay-eelgrass-bcdc-2020 ↗
landing page · from data ca gov
Catalogue records · 1
- CKAN API data.ca.gov/api/3/action/package_show?id=8bf06c71-357d-46ec-9e04-7162252b0… ↗
metadata API · from data ca gov
Topics
- Stated by source
- Natural Resources
- Inferred from text
- Tabular 65%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| California Open Data | 8bf06c71-357d-46ec-9e04-7162252b05a9 | 11 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · data ca gov | connector:data_ca_gov@1.0.0 | |
| concepts[modality].local:modality:tabular | enrichment · data ca gov | keyword-concept-rules@1.0.0 | title+description (65%) |
| concepts[topic].ckan_group:data_ca_gov:natural-resources | source · data ca gov | connector:data_ca_gov@1.0.0 | |
| created_date | source · data ca gov | connector:data_ca_gov@1.0.0 | |
| description | source · data ca gov | connector:data_ca_gov@1.0.0 | /notes |
| license_text | source · data ca gov | connector:data_ca_gov@1.0.0 | |
| publication_date | source · data ca gov | connector:data_ca_gov@1.0.0 | |
| title | source · data ca gov | connector:data_ca_gov@1.0.0 | /title |
| updated_date | source · data ca gov | connector:data_ca_gov@1.0.0 |