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Summary
Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Spatial Info
Access Info
Distribution Info
URLs
Tech Environment
Data Quality
Lineage
Related Items
Catalog Details

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

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.

Distribution Information

  • 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.

  • GeoTIFF

    Bulk download of data files in the original coordinate system.

Access Constraints:

None

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.

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

Geographic Area 1

-122.150072394° W, -121.184315346° E, 38.6011303521° N, 37.6107102588° S

Time Frame 1
2017-12-09 - 2018-01-21

Item Identification

Title: 2017 CA DWR Lidar DEM: Sacramento Delta, CA
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
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
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
Global Change Master Directory (GCMD) Instrument Keywords
LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
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
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
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

CC ID: 1086962
Date Effective From: 2021
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

CC ID: 1086961
Date Effective From: 2021
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

CC ID: 1086963
Date Effective From: 2021
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

CC ID: 1086964
Date Effective From: 2021
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

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1296068
W° Bound: -122.150072394
E° Bound: -121.184315346
N° Bound: 38.6011303521
S° Bound: 37.6107102588

Extent Group 1 / Time Frame 1

CC ID: 1296067
Time Frame Type: Range
Start: 2017-12-09
End: 2018-01-21

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Reference Systems

Reference System 1

CC ID: 1296065

Coordinate Reference System

CRS Type: Projected
EPSG Code: EPSG:3717
EPSG Name: NAD83(NSRS2007) / UTM zone 10N
See Full Coordinate Reference System Information

Reference System 2

CC ID: 1296064

Coordinate Reference System

CRS Type: Vertical
EPSG Code: EPSG:6360
EPSG Name: NAVD88 height (ftUS)
See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
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

CC ID: 1086968
Start Date: 2021-09-20
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

CC ID: 1086969
Start Date: 2021-09-20
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

CC ID: 1086958
URL: https://coast.noaa.gov/
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

CC ID: 1086959
URL: https://coast.noaa.gov/dataviewer/
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

CC ID: 1087355
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8834/details/8834
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

CC ID: 1088266
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8834/supplemental/CA_Sacramento_Lidar_2017_B16_Lidar_Project_Report.pdf
Name: Lidar Project Report
URL Type:
Online Resource
File Resource Format: pdf
Description:

Link to the lidar project report.

URL 5

CC ID: 1088267
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8834/supplemental/CA_Sacramento_Lidar_2017_B16_Survey_Report.pdf
Name: Lidar Survey Report
URL Type:
Online Resource
File Resource Format: pdf
Description:

Link to the lidar survey report.

URL 6

CC ID: 1088268
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8834/supplemental/ca2017_sacra_m8834.kmz
Name: Dataset footprint
URL Type:
Online Resource
File Resource Format: kmz
Description:

Link to the dataset footprint.

URL 7

CC ID: 1088593
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8834/breaklines/
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.

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

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.

Sources

Data extent

CC ID: 1296056
Publish Date: 2019-06-03
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

CC ID: 1296057
Publish Date: 2019-06-03
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

CC ID: 1296058
Publish Date: 2019-06-03
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

CC ID: 1296059
Publish Date: 2019-06-03
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

CC ID: 1296060
Publish Date: 2019-06-03
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

CC ID: 1296061
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.

Process Date/Time: 2017-12-09 00:00:00

Process Step 2

CC ID: 1296062
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.

Process Date/Time: 2019-06-03 00:00:00

Process Step 3

CC ID: 1296063
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.

Process Date/Time: 2021-09-20 00:00:00
Process Contact: Office for Coastal Management (OCM)

Related Items

Item Type Relationship Type Title
Data Set (DS) Cross Reference 2017 CA DWR Lidar: Sacramento Delta, CA

Catalog Details

Catalog Item ID: 65520
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