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Short Citation:
OCM Partners, 2023: 2011 FEMA Lidar DEM: Modoc, California, https://www.fisheries.noaa.gov/inport/item/61272.

Item Identification

Title: 2011 FEMA Lidar DEM: Modoc, California
Status: Completed
Publication Date: 2012-02-10
Abstract:

Digital Mapping Inc. collected lidar data for the Federal Emergency Management Agency (FEMA) in Region 9, Modoc, CA. This bare earth digital elevation model (DEM) dataset encompasses 21 square miles, while the lidar point cloud from which this DEM was derived covers a total of 43 square miles (linked to in the Related Items section, below). Nominal pulse spacing of collection was <1 m.

Purpose:

Terrain data is used to represent the topography of a watershed and/or floodplain environment and to extract useful information for hydraulic and hydrologic models. (Source: FEMA Guidelines and Specifications, Appendix N)

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 > BATHYMETRY > COASTAL BATHYMETRY
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category
elevation
UNCONTROLLED
FEMA NFIP Topic Category Breaklines
FEMA NFIP Topic Category Digital Terrain Model
FEMA NFIP Topic Category Elevation Data
FEMA NFIP Topic Category Land Surface
FEMA NFIP Topic Category LIDAR
FEMA NFIP Topic Category Topography

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
VERTICAL LOCATION > LAND SURFACE
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > SEA FLOOR
UNCONTROLLED
Geographic Names Information System COMMUNITY Modoc County
Geographic Names Information System COUNT-FIPS 049
Geographic Names Information System COUNTY Modoc
Geographic Names Information System FEMA-CID 060192
Geographic Names Information System Region 09
Geographic Names Information System STATE CA

Instrument Keywords

Thesaurus Keyword
UNCONTROLLED
Global Change Master Directory (GCMD) Instrument Keywords Earth Remote Sensing Instruments > Active Remote Sensing > Profilers/Sounders > Lidar/Laser Sounders > LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
AIRCRAFT

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)
Entity Attribute Detail Citation:

Appendix N of FEMA Guidelines and Specifications for FEMA Flood Hazard Mapping Partners contains a detailed description of the data themes and references to other relevant information.

Distribution Liability:

No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty.

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: FEMA, Digital Mapping Inc. for the BakerAECOM, LLC

Support Roles

Data Steward

CC ID: 940135
Date Effective From: 2020
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: 940134
Date Effective From: 2020
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: 940136
Date Effective From: 2020
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: 940137
Date Effective From: 2020
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: 1154566
W° Bound: -120.58570417
E° Bound: -120.44318533
N° Bound: 41.51813209
S° Bound: 41.3914362

Extent Group 1 / Time Frame 1

CC ID: 1154565
Time Frame Type: Discrete
Start: 2011-05-04

Spatial Information

Spatial Resolution

Horizontal Distance: 10.0 Meter

Spatial Representation

Representations Used

Grid: No
Vector: No
Text / Table: No
TIN: No
Stereo Model: No
Video: No

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for bulk or 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: 940138
Start Date: 2020-07-27
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9163
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2020 - Present)
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base.

File Type: Zip
Compression: Zip

Distribution 2

CC ID: 940139
Start Date: 2020-07-27
End Date: Present
Download URL: https://coast.noaa.gov/htdata/raster5/elevation/FEMA_modoc_CA_DEM_2011_9163/
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2020 - Present)
File Name: Bulk Download
Description:

Bulk download of data files in original coordinates and datums.

File Type: GeoTIFF

URLs

URL 1

CC ID: 940140
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 2

CC ID: 940141
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9162/supplemental/extent_Modoc_CA_m9162.kmz
Name: Browse graphic
URL Type:
Browse Graphic
File Resource Format: KML
Description:

This graphic displays the footprint for this lidar data set.

URL 3

CC ID: 940142
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9162/supplemental/BakerAECOM_LiDAR_Modoc_Final_QAQC_Report.pdf
Name: Dataset report
URL Type:
Online Resource
File Resource Format: PDF
Description:

Link to data set report.

URL 4

CC ID: 940143
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9162/supplemental/Modoc_Final_Report.pdf
Name: Dataset report
URL Type:
Online Resource
File Resource Format: PDF
Description:

Link to data set report.

Technical Environment

Description:

GeoCue, TerraScan, TerraMatch, MicroStation, DashMap, Windows XP

Data Quality

Horizontal Positional Accuracy:

Quantitative value: , Test that produced the valued:

Vertical Positional Accuracy:

Modoc tested 0.449 ft (13.69 centimeters) Fundamental Vertical Accuracy at 95% confidence level in open terrain using RMSEz x 1.9600. The Modoc FVA value passes the minimum requirement of 24.5 centimeters.

Fundamental Vertical Accuracy (FVA) is defined as “The value by which vertical accuracy can be equitably assessed and compared among datasets. The FVA is determined with vertical checkpoints located only in open terrain, where there is a very high probability that the sensor will have detected the ground surface.” (FEMA Procedure Memorandum No. 61‐ Standards for LiDAR and Other High Quality Digital topography, September, 27, 2010, Page 6) The twenty‐five (25) points are to be evenly distributed throughout the project area. See QA/QC Report for more details.

Conceptual Consistency:

The Terrain data are consistent with the Elevation dataset. A comparison of profile plots with the flow vector data confirms that flow vectors are correctly drawn. Flood hazard boundaries do not extend beyond the ExternalBoundary, if exists.

Data Management

Have Resources for Management of these Data Been Identified?: Yes
Approximate Percentage of Budget for these Data Devoted to Data Management: Unknown
Do these Data Comply with the Data Access Directive?: Yes
Actual or Planned Long-Term Data Archive Location: NCEI-CO
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

Data is backed up to tape and to cloud storage.

Lineage

Sources

LIDAR Data

CC ID: 1154561
Contact Role Type: Originator
Contact Type: Organization
Contact Name: Digital Mapping Inc
Publish Date: 2012-02-10
Extent Type: Discrete
Extent Start Date/Time: 2011-05-04
Source Contribution:

Digital Mapping Inc.

Process Steps

Process Step 1

CC ID: 1154562
Description:

1-Acqusition:

Modoc LIDAR acquisition consisted of 26 flight lines with 2 cross flights. Alturas Airport was flown for the airport calibration. Two base stations were used for the project. The LIDAR misson was flown in 05/04/2011.

ALTM Gemini was used as the LIDAR scanner. LIDAR flight settings were:

Altitude (m): 1200

System PRF (kHz): 70

Scan Freq (Hz): 39

Scan Angle +/-: 17

Desired Res (m): 0.804

PPM^2: 1.55

2-Processing:

LIDAR data were processed and fit to the ground using DASHMap, GeoCue, TerraScan and TerraMatch softwares. All the data were calibrated to determine and eliminate systematic biases that might occur within the hardware of the ALTM Gemini system. A total of 11 aerial targets were surveyed and used to fit the LIDAR data to the ground. Ground point were removed from the top of bridges. LAS tiles that touch processing limit are classified however QA\QC of the ground points were done to the data which were within processing limit. LAS tiles are classified into 6 classes:

1 processed, but unclassified

2 bare-earth ground

7 noise

9 water

10 ignored

11 withheld

3-Breaklines:

Breaklines were compiled for streams, lakes, ponds and man-made features -bridges, culverts- that constrict or control the flow of water in 3D data collection mode from LIDAR data. Breaklines were not collected for the areas outside the processing limit.

Ponds and lakes are collected as polygons. They have constant elevation and they have elevation values less than the surrounding ground points.

For dry streams and streams narrower than 50 feet single stream breaklines were collected. For streams wider than 50 feet edges of the streams were collected along with stream centerline. The project area was relatively flat which made it some of the streams having single elevation across. Stream breaklines were broken at culverts and not broken at bridges.

Culvert breaklines snap to stream endpoints on both sides and have the same elevation as the stream breakline at the snapping location.

Top and bottom of the bridge breaklines were collected.

Breaklines are delivered as ESRI geodatabase file format. Topology rules were applied to the breaklines. Breaklines snap to each other, split at intersections, not self-intersect or overlap each other.

4-Low Confidence Areas:

Areas that may not meet the data accuracy requirements due to heavy vegetation were compiled as 2D polygon. Special effort was given to minimize these areas.

Ground points were tried to be classified from dense vegetation areas where possible using manual techniques.

Process Step 2

CC ID: 1154563
Description:

NOAA Office for Coastal Management (OCM) received 1 bare earth raster DEM file in geotiff format. The data were in California State Plane Zone 1 (NAD83), international feet coordinates and NAVD88 (Geoid03) elevations in international feet, at 10 ft spacing. OCM copied the raster files to https for Digital Coast storage and provisioning purposes.

Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 61272
GUID: gov.noaa.nmfs.inport:61272
Metadata Record Created By: Blake Waring
Metadata Record Created: 2020-07-27 14:18+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
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