2017 CA DWR Lidar DEM: Sacramento Delta, CA
Data Set (DS) | OCM Partners (OCMP)GUID: gov.noaa.nmfs.inport:65520 | Updated: January 10, 2024 | Published / External
Summary
Short Citation
OCM Partners, 2024: 2017 CA DWR Lidar DEM: Sacramento Delta, CA, https://www.fisheries.noaa.gov/inport/item/65520.
Full Citation Examples
Dataset Description: The CA Central Valley Lidar 2016 D16 Mod 002: CA Sacramento Delta Lidar 2017 D16 lidar project called for the planning, acquisition, processing, and production of derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.35 meters. Project specifications were based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2
Ground Conditions: Lidar was collected from December 9, 2017 through January 21, 2018 by Woolpert, while no snow was on the ground and rivers were at or below normal levels. Saturated or partially flooded farm fields were identified following data acquisition. Through technical guidance discussions with USGS and the California Department of Water, it was determined such areas shall not be considered hydrologic features. Intermittently, partially flooded, irregular, and apparently non-agricultural fields were treated as hydrologic features. In all cases, best professional judgement was used in determination of treatment. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, Woolpert established 35 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area. An additional 143 independent accuracy checkpoints (75 NVA points and 68 VVA points), were collected and used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.
In addition to these bare earth Digital Elevation Model (DEM) data, the lidar point data that these DEM data were created from, are also available. These data are available for custom download at the link provided in the URL section of this metadata record.
Distribution Information
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Create custom data files by choosing data area, map projection, file format, etc. A new metadata will be produced to reflect your request using this record as a base.
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GeoTIFF
Bulk download of data files in the original coordinate system.
None
Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.
Controlled Theme Keywords
COASTAL ELEVATION, elevation, SEAFLOOR TOPOGRAPHY, TERRAIN ELEVATION
Child Items
No Child Items for this record.
Contact Information
Point of Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov
Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov
Extents
-122.150072394° W,
-121.184315346° E,
38.6011303521° N,
37.6107102588° S
2017-12-09 - 2018-01-21
Item Identification
Title: | 2017 CA DWR Lidar DEM: Sacramento Delta, CA |
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Short Name: | ca2017_sac_dem_m9368_metadata |
Status: | Completed |
Creation Date: | 2017 |
Publication Date: | 2019-06-03 |
Abstract: |
Dataset Description: The CA Central Valley Lidar 2016 D16 Mod 002: CA Sacramento Delta Lidar 2017 D16 lidar project called for the planning, acquisition, processing, and production of derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.35 meters. Project specifications were based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2 Ground Conditions: Lidar was collected from December 9, 2017 through January 21, 2018 by Woolpert, while no snow was on the ground and rivers were at or below normal levels. Saturated or partially flooded farm fields were identified following data acquisition. Through technical guidance discussions with USGS and the California Department of Water, it was determined such areas shall not be considered hydrologic features. Intermittently, partially flooded, irregular, and apparently non-agricultural fields were treated as hydrologic features. In all cases, best professional judgement was used in determination of treatment. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, Woolpert established 35 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area. An additional 143 independent accuracy checkpoints (75 NVA points and 68 VVA points), were collected and used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. In addition to these bare earth Digital Elevation Model (DEM) data, the lidar point data that these DEM data were created from, are also available. These data are available for custom download at the link provided in the URL section of this metadata record. |
Purpose: |
Data was collected to be used for the following: terrain mapping, conservation planning and design, support of easement/land stewardship programs, support of special emphasis programs, support of soil projects, fill gaps in existing lidar, water resource management. |
Supplemental Information: |
USGS Contract No. G16PC00022 Task Order No. G16PD01047 (Mod 002). CONTRACTOR: Woolpert Raster File Type = IMG Bit Depth/Pixel Type = 32-bit float Raster Cell Size = 0.5 Meter Interpolation or Re-sampling Technique = Triangulated Irregular Network Required Vertical Accuracy = 19.6 cm NVA |
Keywords
Theme Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Science Keywords |
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
|
Global Change Master Directory (GCMD) Science Keywords |
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > SEAFLOOR TOPOGRAPHY
|
Global Change Master Directory (GCMD) Science Keywords |
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
|
ISO 19115 Topic Category |
elevation
|
UNCONTROLLED | |
None | DEM |
Spatial Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Location Keywords |
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
|
Global Change Master Directory (GCMD) Location Keywords |
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CALIFORNIA
|
Global Change Master Directory (GCMD) Location Keywords |
VERTICAL LOCATION > LAND SURFACE
|
Global Change Master Directory (GCMD) Location Keywords |
VERTICAL LOCATION > SEA FLOOR
|
Instrument Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Instrument Keywords |
LIDAR > Light Detection and Ranging
|
Platform Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Platform Keywords |
Airplane > Airplane
|
Global Change Master Directory (GCMD) Platform Keywords |
DEM > Digital Elevation Model
|
Physical Location
Organization: | Office for Coastal Management |
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City: | Charleston |
State/Province: | SC |
Data Set Information
Data Set Scope Code: | Data Set |
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Data Set Type: | Elevation |
Maintenance Frequency: | None Planned |
Data Presentation Form: | Model (digital) |
Distribution Liability: |
Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners. |
Data Set Credit: | Woolpert, CA Dept. of Water Resources (CA DWR) |
Support Roles
Data Steward
Date Effective From: | 2021 |
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Date Effective To: | |
Contact (Organization): | NOAA Office for Coastal Management (NOAA/OCM) |
Address: |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address: | coastal.info@noaa.gov |
Phone: | (843) 740-1202 |
URL: | https://coast.noaa.gov |
Distributor
Date Effective From: | 2021 |
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Date Effective To: | |
Contact (Organization): | NOAA Office for Coastal Management (NOAA/OCM) |
Address: |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address: | coastal.info@noaa.gov |
Phone: | (843) 740-1202 |
URL: | https://coast.noaa.gov |
Metadata Contact
Date Effective From: | 2021 |
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Date Effective To: | |
Contact (Organization): | NOAA Office for Coastal Management (NOAA/OCM) |
Address: |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address: | coastal.info@noaa.gov |
Phone: | (843) 740-1202 |
URL: | https://coast.noaa.gov |
Point of Contact
Date Effective From: | 2021 |
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Date Effective To: | |
Contact (Organization): | NOAA Office for Coastal Management (NOAA/OCM) |
Address: |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address: | coastal.info@noaa.gov |
Phone: | (843) 740-1202 |
URL: | https://coast.noaa.gov |
Extents
Currentness Reference: | Ground Condition |
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Extent Group 1
Extent Group 1 / Geographic Area 1
W° Bound: | -122.150072394 | |
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E° Bound: | -121.184315346 | |
N° Bound: | 38.6011303521 | |
S° Bound: | 37.6107102588 |
Extent Group 1 / Time Frame 1
Time Frame Type: | Range |
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Start: | 2017-12-09 |
End: | 2018-01-21 |
Spatial Information
Spatial Representation
Representations Used
Grid: | Yes |
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Reference Systems
Reference System 1
Coordinate Reference System |
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Reference System 2
Coordinate Reference System |
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Access Information
Security Class: | Unclassified |
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Data Access Procedure: |
Data is available online for bulk and custom downloads. |
Data Access Constraints: |
None |
Data Use Constraints: |
Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. |
Distribution Information
Distribution 1
Start Date: | 2021-09-20 |
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End Date: | Present |
Download URL: | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9368/details/9368 |
Distributor: | NOAA Office for Coastal Management (NOAA/OCM) (2021 - Present) |
File Name: | Customized Download |
Description: |
Create custom data files by choosing data area, map projection, file format, etc. A new metadata will be produced to reflect your request using this record as a base. |
File Type (Deprecated): | Zip |
Compression: | Zip |
Distribution 2
Start Date: | 2021-09-20 |
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End Date: | Present |
Download URL: | https://noaa-nos-coastal-lidar-pds.s3.us-east-1.amazonaws.com/dem/CA_Sacramento_DEM_2017_9368/index.html |
Distributor: | NOAA Office for Coastal Management (NOAA/OCM) (2021 - Present) |
File Name: | Bulk Download |
Description: |
Bulk download of data files in the original coordinate system. |
File Type (Deprecated): | GeoTIFF |
Distribution Format: | GeoTIFF |
URLs
URL 1
URL: | https://coast.noaa.gov/ |
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Name: | NOAA's Office for Coastal Management (OCM) website |
URL Type: |
Online Resource
|
File Resource Format: | HTML |
Description: |
Information on the NOAA Office for Coastal Management (OCM) |
URL 2
URL: | https://coast.noaa.gov/dataviewer/ |
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Name: | NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV) |
URL Type: |
Online Resource
|
File Resource Format: | HTML |
Description: |
The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer. |
URL 3
URL: | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8834/details/8834 |
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Name: | Custom Point Download |
URL Type: |
Online Resource
|
File Resource Format: | Zip |
Description: |
Link to custom download, from the Data Access Viewer (DAV), the lidar point data from which these raster Digital Elevation Model (DEM) data were created. |
URL 4
URL: | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8834/supplemental/CA_Sacramento_Lidar_2017_B16_Lidar_Project_Report.pdf |
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Name: | Lidar Project Report |
URL Type: |
Online Resource
|
File Resource Format: | |
Description: |
Link to the lidar project report. |
URL 5
URL: | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8834/supplemental/CA_Sacramento_Lidar_2017_B16_Survey_Report.pdf |
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Name: | Lidar Survey Report |
URL Type: |
Online Resource
|
File Resource Format: | |
Description: |
Link to the lidar survey report. |
URL 6
URL: | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8834/supplemental/ca2017_sacra_m8834.kmz |
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Name: | Dataset footprint |
URL Type: |
Online Resource
|
File Resource Format: | kmz |
Description: |
Link to the dataset footprint. |
URL 7
URL: | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8834/breaklines/ |
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Name: | Hydro Breaklines |
URL Type: |
Online Resource
|
File Resource Format: | Zip |
Description: |
Link to the hydro breaklines. |
Technical Environment
Description: |
Microsoft Windows 10 Version 1607 (Build 14393.2189); ArcMap 10.3; ArcCatalog 10.3; TerraScan ver. 17; TerraModeler ver. 17; Geocue 2017.2.20.0. |
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Data Quality
Vertical Positional Accuracy: |
The project specifications require the accuracy (ACCz) of the derived DEM be calculated and reported in two ways: 1. The required NVA is: 19.6 cm at a 95% confidence level, derived according to NSSDA, i.e., based on RMSE of 10 cm in non-vegetated land cover classes. This is a required accuracy. The NVA was tested with 68 checkpoints located in non-vegetated areas. 2. Vegetated Vertical Accuracy (VVA): VVA shall be reported for vegetated land cover classes. The target VVA is: 29.4 cm at the 95th percentile, derived according to ASPRS Guidelines, Vertical Accuracy Reporting for Lidar Data, i.e., based on the 95th percentile error in all vegetated land cover classes combined. This is a target accuracy. The VVA was tested with 68 checkpoints located in vegetated areas. The checkpoints were distributed throughout the project area and were surveyed using GPS techniques. See survey report for additional survey methodologies. AccuracyZ has been tested to meet 19.6 cm or better Non-Vegetated Vertical Accuracy at 95% confidence level using RMSE(z) x 1.9600 as defined by the National Standard for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASRPS Guidelines. Tested 0.099 meters NVA at a 95% confidence level using RMSE(z) 0.051 x 1.9600 as defined by the National Standard for Spatial Data Accuracy (NSSDA). The NVA of the DEM was calculated using 75 independent checkpoints located in non-vegetated land cover categories. Tested 0.289 meters VVA was calculated using 68 checkpoints located in vegetated land cover categories at the 95th percentile, derived according to ASPRS Guidelines, Vertical Accuracy Reporting for Lidar Data. Tested against the DEM. VVA Errors larger than 95th percentile include: Point 3001, Easting 576285.632, Northing 4229651.745, Z-Error 0.386 Meters Point 3039_A, Easting 613532.538, Northing 4217704.581, Z-Error 0.313 Meters Point 3044, Easting 636454.834, Northing 4187011.525, Z-Error 0.301 Meters |
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Completeness Report: |
Datasets contain complete coverage of tiles. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. There are no void areas or missing data. The DEM is of good quality and data passes Non-Vegetated and Vegetated Vertical Accuracy specifications. |
Conceptual Consistency: |
Data covers the entire area specified for this project. |
Lineage
Lineage Statement: |
This data set was downloaded from the CA DWR ftp site and processed to make it available for custom download from the Data Access Viewer (DAV) and for bulk download from https. |
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Sources
Data extent
Publish Date: | 2019-06-03 |
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Extent Type: | Discrete |
Extent Start Date/Time: | 2019-06-03 |
Source Contribution: |
The data extent was created in shapefile format. The shapefile was buffered by 100-meters. It was used in acquisition planning and to clip the final deliverable data. |
Hydro Breaklines
Publish Date: | 2019-06-03 |
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Extent Type: | Discrete |
Extent Start Date/Time: | 2019-06-03 |
Source Contribution: |
This dataset includes hydro breaklines collected as part of this task order. |
Lidar acquisition
Publish Date: | 2019-06-03 |
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Extent Type: | Range |
Extent Start Date/Time: | 2017-12-09 |
Extent End Date/Time: | 2018-01-21 |
Source Contribution: |
This dataset includes airborne lidar data point cloud data acquired as part of this task order. This data was used to create the required derivative lidar products. |
Survey Control Acquisition
Publish Date: | 2019-06-03 |
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Extent Type: | Range |
Extent Start Date/Time: | 2017-02-02 |
Extent End Date/Time: | 2017-02-14 |
Source Contribution: |
This dataset includes ground control and QA/QC checkpoints collected as part of this task order. These points were used in the calibration and accuracy testing of the lidar point cloud and DEM data. |
Tile index
Publish Date: | 2019-06-03 |
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Extent Type: | Discrete |
Extent Start Date/Time: | 2019-06-03 |
Source Contribution: |
The tile index was created in shapefile format. The tiles have a size of 1,500-meters x 1,500-meters. Tile names were derived from US National Grid. This index was used to create the tiled deliverables for this project. |
Process Steps
Process Step 1
Description: |
The data was developed based on a horizontal datum/projection of NAD83 (NSRS2007) UTM Zone 10 (EPSG 3717) meters, and a vertical datum of NAVD88 (GEOID12B), US survey feet. DEM data was delivered as ERDAS IMG files formatted to 1,706 individual 1,500-meter x 1,500-meter tiles. Product: 0.5-meter bare-earth raster digital elevation model (DEM) data tiles in ERDAS IMG format. Geographic Extent: Approximately 1,312 square miles across several counties in central California. |
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Process Date/Time: | 2017-12-09 00:00:00 |
Process Step 2
Description: |
Hydro-Flattened Digital Elevation Models (DEMs): Class 2 (ground) lidar points in conjunction with the hydro breaklines as well bridge breaklines were used to create a 0.5-meter hydro-flattened bare-earth raster DEM. Using automated scripting routines within ArcMap, an ERDAS IMG file was created for each tile. Each surface is reviewed using Global Mapper to check for any surface anomalies or incorrect elevations found within the surface. |
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Process Date/Time: | 2019-06-03 00:00:00 |
Process Step 3
Description: |
The NOAA Office for Coastal Management (OCM) downloaded 1706 ERDAS .img format files from this CA DWR ftp site: http://gisarchive.cnra.ca.gov/iso/ImageryBaseMapsLandCover/LIDAR/DeltaLIDAR2017/bare_earth/be_rasters/. The files were at a 0.5 m grid spacing. The data were in UTM Zone 10 (NSRS 2007), meters coordinates and in NAVD88 (Geoid12B) elevations in US survey feet. OCM assigned the appropriate EPSG codes (Horiz - 3717, Vert - 6360) and copied the raster files to https for Digital Coast storage and provisioning purposes. |
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Process Date/Time: | 2021-09-20 00:00:00 |
Process Contact: | Office for Coastal Management (OCM) |
Related Items
Item Type | Relationship Type | Title |
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Data Set (DS) | Cross Reference |
2017 CA DWR Lidar: Sacramento Delta, CA |
Catalog Details
Catalog Item ID: | 65520 |
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GUID: | gov.noaa.nmfs.inport:65520 |
Metadata Record Created By: | Rebecca Mataosky |
Metadata Record Created: | 2021-09-20 20:02+0000 |
Metadata Record Last Modified By: | Kirk Waters |
Metadata Record Last Modified: | 2024-01-10 19:19+0000 |
Metadata Record Published: | 2024-01-10 |
Owner Org: | OCMP |
Metadata Publication Status: | Published Externally |
Do Not Publish?: | N |
Metadata Last Review Date: | 2022-03-16 |
Metadata Review Frequency: | 1 Year |
Metadata Next Review Date: | 2023-03-16 |