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Short Citation:
Office for Coastal Management, 2022: Humboldt Bay Orthoimages,

Item Identification

Title: Humboldt Bay Orthoimages
Short Name: 2009_humboldt_DMC
Status: Completed
Publication Date: 2009

This data set consists of 0.5-meter pixel resolution, four band orthoimages covering the Humboldt Bay area. An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. Each orthoimage provides imagery over a DOQQQ with a 100-meter image overlap between adjacent files. The projected coordinate system is UTM Zone 10 North with a NAD83 datum.


This data depicts geographic features on the surface of the earth. It was created to provide easily accessible geospatial data which is readily available to enhance the capability of Federal, State, and local emergency responders, as well as plan for homeland security efforts. This data also supports The National Map.




Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
Global Change Master Directory (GCMD) Science Keywords
Global Change Master Directory (GCMD) Instrument Keywords Earth Remote Sensing Instruments > Passive Remote Sensing > Photon/Optical Detectors > Cameras > CAMERAS
Global Change Master Directory (GCMD) Platform Keywords Aircraft > AIRCRAFT
ISO 19115 Topic Category imageryBaseMapsEarthCover
None 0.5 meter orthoimage
None four band orthophoto
None image map
None orthoimage
None orthophoto
None rectified image
None rectified photograph
None Remotely Sensed Imagery/Photos

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
None Bumboldt County
None California
None Pacific Ocean

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: Map (digital)
Entity Attribute Overview:

Four band orthoimagery is organized in four color bands or channels which represent the red, green, blue and near infrared portions of the spectrum. Each image pixel is assigned a quadruplet of numeric values, one for each color band. Numeric values range from 0 to 4095. Areas where data is incomplete due to lack of full image coverage are represented with the numeric value of 0.

Entity Attribute Detail Citation:

U.S. Department of the Interior, U.S. Geological Survey, 1996, Standards for Digital Orthophotos: Reston, VA.

Distribution Liability:

These photographs were obtained for use by the OCM during the course of its development of potential products to fulfill its statutory mission. Although OCM is making these photographs available to others who may find the photographs of value, OCM does not warrant, endorse, or recommend the use of these photographs for any given purpose. OCM is providing these photographs "as is," and OCM disclaims any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will OCM be liable to you or any third party for any direct, indirect, incidental, consequential, special, or exemplary damages or lost profits resulting from any use or misuse of these data.

Data Set Credit: Produced by Photo Science, Inc for the Office for Coastal Management of the National Oceanic and Atmospheric Administration

Support Roles

Data Steward

CC ID: 633061
Date Effective From: 2009
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


CC ID: 633063
Date Effective From: 2009
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 633064
Date Effective From: 2009
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Point of Contact

CC ID: 633062
Date Effective From: 2009
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 633067
W° Bound: -124.408105
E° Bound: -123.998331
N° Bound: 40.969971
S° Bound: 40.529959

Extent Group 1 / Time Frame 1

CC ID: 633066
Time Frame Type: Discrete
Start: 2009-06-27

Access Information

Security Class: Unclassified
Data Access Constraints:


Data Use Constraints:

Data set is not for use in litigation. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, NOAA, cannot assume liability for any damages, or misrepresentations, caused by any inaccuracies in the data, or as a result of data to be used on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. We request that you credit the National Oceanic and Atmospheric Administration (NOAA) when you use these photos in a report, publication, or presentation.

Distribution Information

Distribution 1

CC ID: 744332
Download URL:
File Name: Customized Download

Create custom data files by choosing area, map projection, file format, etc.

Distribution 2

CC ID: 744333
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 744335
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 633087
Activity Date/Time: 2016-05-23

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 633086
Activity Date/Time: 2017-11-14

Converted from FGDC Content Standard for Digital Geospatial Metadata (version FGDC-STD-001-1998) using '' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 717147
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 744334
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Technical Environment


ArcGIS 9.3.1; MicroStation v7; Z/I Imaging ISAT 5.3 and Orthopro 5.3

Data Quality


Radiometry is verified by visual inspection of the digital orthophoto. Slight systematic radiometric differences may exist between adjacent orthoimage files. These are due primarily to differences in source image capture dates and sun angles along flight lines. These differences can be observed in an image's general lightness or darkness when it is compared to adjacent orthoimage file coverages. Tonal balancing may be performed over a group of images during the mosaicking process which may serve to lighten or darken adjacent images for better color tone matching.

Horizontal Positional Accuracy:

The horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process. The location of existing photoidentifiable ground control and aerotriangulation points were evaluated on the GeoTIFF image and compared with their ground values in order to determine an overall accuracy for each test block of orthoimages within the project. After image coordinate measurement was completed for each block, an RMSE for the diagonal error was calculated for the orthoimages within the block. This value is an estimate of the horizontal accuracy of the tile expressed in meters.; Quantitative Value: 0.948 meters, Test that produced the value: Federal Geographic Data Committee, 1998, Geospatial Positioning Accuracy Standard, Part 3, National Standard for Spatial Data Accuracy, FGDC-STD-007.3-1998

Completeness Report:

Orthoimages are visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images. These images are derived by mosaicking multiple images to ensure complete coverage. Source imagery is cloud free. Photography was flown during leaf-off in deciduous vegetation regions. Imagery along the eastern margin of the urban area coverage and falling outside of the urban area may contain some void areas. These void areas have a radiometric value of 0 (black).

Conceptual Consistency:

All GeoTIFF tagged data and image file sizes are validated using commercial GIS software to ensure proper loading before being archived. This validation procedure ensures correct physical format and field values for tagged elements. Seamlines and tile edges are visually inspected. Seamline mismatches are not corrected unless the overall displacement exceeds one meter.




CC ID: 633053
Contact Name: Photo Science, Inc.
Extent Type: Discrete
Extent Start Date/Time: 2009-09-01
Source Contribution:

Aerotriangulation provides the exterior orientation parameters (X, Y, Z, omega, phi, kappa) for input to the orthorectification process. | Type of Source Media: disc

Airborne GPS

CC ID: 633052
Contact Name: Photo Science, Inc.
Extent Type: Discrete
Extent Start Date/Time: 2009
Source Contribution:

Provides initial photo station positions to control aerotriangulation. | Type of Source Media: disc


CC ID: 633051
Contact Name: Photo Science, Inc.
Extent Type: Discrete
Extent Start Date/Time: 2009
Source Contribution:

Provides ground coordinates used as reference for ABGPS and quality check for Orthophotographs. | Type of Source Media: disc

Raw Frames

CC ID: 633050
Contact Name: Photo Science, Inc.
Extent Type: Discrete
Extent Start Date/Time: 2009-06-27
Source Contribution:

Source imagery for orthorectification process | Source Geospatial Form: remote-sensing image | Type of Source Media: disc

USGS 10m National Elevation Dataset

CC ID: 633054
Contact Name: U. S. Geological Survey
Publish Date: 2001-01-01
Extent Type: Range
Extent Start Date/Time: 1950
Extent End Date/Time: 1954
Source Contribution:

Used to provide ground elevations for orthorectification process. | Type of Source Media: CD-ROM

Process Steps

Process Step 1

CC ID: 633055

The rectification process requires, as input, a digital elevation model (DEM) gridded to user-specified bounds, a digital image file (PHOTO), and external orientation parameters for the aerial photograph which are typically derived from aerotriangulation (ATCONTROL). Four band imagery was collected at a flight elevation of 20,000 feet. Airborne GPS positions were computed by Photo Science, Inc. and used as control in the aerotriangulation process. The aerial images, AGPS data, ground check point data, and camera calibration data were used as inputs to the aerotriangulation process. ISAT 04.05 was used to perform block adjustments and generate exterior orientation parameters for each photo. The external orientation parameters were used to provide the geospatial control each photograph during orthorectification. Vertical control for the orthorectification process was obtained from existing USGS Digital Elevation Models (DEM). During the orthorectification process, elevation data were extracted and resampled to meet user-specified intervals and bounds. The orthorectified imagery is resampled to a 0.5 meter ground resolution with a ground extent of a DOQQQ, with 100-meter image overlap. Each DOQQQ orthoimage was generated from a mosaic created from multiple photographs. Orthoproduction was performed using the Intergraph Ortho Pro 4.4.18. Seamlines were Manually Generated and tone balanced between frames prior to cutting out into DOQQQ products. The orthorectified imagery is georeferenced to UTM zone 14, NAD83, meters. All orthoimages are individually inspected for content, misalignments along mosaic seamlines, and void areas. Source information was collected and verified manually during the production process.

Process Date/Time: 2009-01-01 00:00:00

Catalog Details

Catalog Item ID: 48395
GUID: gov.noaa.nmfs.inport:48395
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 14:46+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2018-03-13
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-03-13
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-03-13