Table · dataset · 2025
i17 Delta Levees Centerlines 2007
Listed in California Open Data
In the Delta Anatomy Mapping Project, all levee anatomies were delineated using slope grids built from available 2007 Delta LIDAR data points.
Description
LIDAR data points were converted to digital elevation models and subsequently into slope grids. Thresholds were identified that capture the levee crown, levee landside, levee waterside, ramps and toe ditches.
Visual interpretations of slope thresholds were used in conjunction with heads-up digitizing to maintain smooth boundaries at a scale of 1:550. The delineation thresholds were derived from a combination of mapping scale, slope grid resolution and slope thresholds used for each anatomy classification. All anatomy has gone through internal quality control processes to ensure a minimum accuracy of +/- 3 feet.
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Anatomy data was further reviewed and tested by DWR for compliance with an interpretive mapping standard of 80% accuracy. Once the levee anatomy was created and accepted, isolation and export of the levee crown was used in conjucture with ET Geowizards to collapse the crown to a singular centerline which details the levee route. This data depicts the levee anatomy at the time of the LiDAR survey (2007) and are only accurate for that time.
Users should be aware that temporal changes may have occurred since this data set was created and some parts of this data may no longer represent actual surface conditions. Changes in some linework and attribution were performed by CA DWR Division of Engineering in September, 2018, and current version was posted to DWR GIS Atlas at that time
Links
Get the data
- Publisher page gis.data.cnra.ca.gov/datasets/f5d14c6660004c16a81d0212bd146366_0 ↗
documentation · download · from data ca gov
- ArcGIS GeoService utility.arcgis.com/usrsvcs/servers/f5d14c6660004c16a81d0212bd146366/rest/services… ↗
download · from data ca gov
- CSV gis.data.cnra.ca.gov/api/download/v1/items/f5d14c6660004c16a81d0212bd146366/csv?lay… ↗
download · from data ca gov
- Shapefile gis.data.cnra.ca.gov/api/download/v1/items/f5d14c6660004c16a81d0212bd146366/shapefi… ↗
download · from data ca gov
- GeoJSON gis.data.cnra.ca.gov/api/download/v1/items/f5d14c6660004c16a81d0212bd146366/geojson… ↗
download · from data ca gov
- KML gis.data.cnra.ca.gov/api/download/v1/items/f5d14c6660004c16a81d0212bd146366/kml?lay… ↗
download · from data ca gov
Where it is published
- California Open Data dataset page data.ca.gov/dataset/i17-delta-levees-centerlines-2007 ↗
landing page · from data ca gov
Catalogue records · 1
- CKAN API data.ca.gov/api/3/action/package_show?id=8c829a5c-0227-46bf-91fd-4a0d25c87… ↗
metadata API · from data ca gov
Topics
- Stated by source
- Natural Resources · Water
- From keywords
- Earth & Environmental Science
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| California Open Data | 8c829a5c-0227-46bf-91fd-4a0d25c87550 | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · data ca gov | connector:data_ca_gov@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · data ca gov | connector:data_ca_gov@1.0.0 | |
| concepts[topic].ckan_group:data_ca_gov:natural-resources | source · data ca gov | connector:data_ca_gov@1.0.0 | |
| concepts[topic].ckan_group:data_ca_gov:water | 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 |