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Short Citation:
OCM Partners, 2022: 2004 Coastal California IfSAR: Digital Elevation Model (DEM),

Item Identification

Title: 2004 Coastal California IfSAR: Digital Elevation Model (DEM)
Short Name: nextmap_coast_ca_dtm
Status: Completed
Publication Date: 2004-06-15

Intermap DEMs populate its data store. The DEM products are generated using Intermap's STAR technology

(Interferometric Synthetic Aperture Radar). The system is mounted in an aircraft.

The Digital Terrain Model (DTM) data product was derived from the Digital Surface Model (DSM) using Intermap's

proprietory algorithm.

The DTM data for 7.5-minute by 7.5-minute units correspond to the USGS 1:24,000 scale topographic quadrangle map

series for areas in the United States and throughout the world. Each 7.5-minute by 7.5-minute DSM is comprised of

elevations at 5 meter postings. Each tile provides full coverage with overlap into adjacent tiles. Data for locations

above 56 degrees North/South are licensed in 7.5-minute by 15-minute tiles.

Original contact information:

Contact Org: NOAA Office for Coastal Management (OCM)

Phone: 843-740-1202



The DTMs are used as a fundamental layer of information in Geographic Information Systems (GIS) and Spatial

Information Decision Support Systems (DSS). A number of the priority layers of spatial information recognized by the

National Spatial Data Infrastructure may be derived from Intermap Technologies DEMs, including elevation, hydrography,

slope, aspect, and shoreline delineation.



Supplemental Information:



Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category imageryBaseMapsEarthCover
MEL_Scientific-Engineering_Field_Thesaurus Cartography
MEL_Scientific-Engineering_Field_Thesaurus DEM
MEL_Scientific-Engineering_Field_Thesaurus DSM
MEL_Scientific-Engineering_Field_Thesaurus DTM
MEL_Scientific-Engineering_Field_Thesaurus Elevation
MEL_Scientific-Engineering_Field_Thesaurus Geodesy
MEL_Scientific-Engineering_Field_Thesaurus Geography
MEL_Scientific-Engineering_Field_Thesaurus GEOSAR
MEL_Scientific-Engineering_Field_Thesaurus height
MEL_Scientific-Engineering_Field_Thesaurus Hypsography
MEL_Scientific-Engineering_Field_Thesaurus IFSAR
MEL_Scientific-Engineering_Field_Thesaurus IFSARE
MEL_Scientific-Engineering_Field_Thesaurus INSAR
MEL_Scientific-Engineering_Field_Thesaurus Interferometric
MEL_Scientific-Engineering_Field_Thesaurus Mapping
MEL_Scientific-Engineering_Field_Thesaurus ORI
MEL_Scientific-Engineering_Field_Thesaurus Photogrammetry
MEL_Scientific-Engineering_Field_Thesaurus Radar
MEL_Scientific-Engineering_Field_Thesaurus Remote
MEL_Scientific-Engineering_Field_Thesaurus SAR
MEL_Scientific-Engineering_Field_Thesaurus Sensing
MEL_Scientific-Engineering_Field_Thesaurus Stereophotogrammetry
MEL_Scientific-Engineering_Field_Thesaurus Topography

Temporal Keywords

Thesaurus Keyword
None 2004

Spatial Keywords

Thesaurus Keyword
None California
None US

Stratum Keywords

Thesaurus Keyword
MEL_Environmental_Domain_Thesaurus Earth
MEL_Environmental_Domain_Thesaurus First
MEL_Environmental_Domain_Thesaurus Ground
MEL_Environmental_Domain_Thesaurus Surface
MEL_Environmental_Domain_Thesaurus Terrain

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Note:


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 it's partners.

Data Set Credit: This data was produced by Intermap Technologies Inc.

Support Roles

Data Steward

CC ID: 662823
Date Effective From: 2004-06-15
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: 662825
Date Effective From: 2004-06-15
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: 662826
Date Effective From: 2004-06-15
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: 662824
Date Effective From: 2004-06-15
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: The above dates refer to the time of field data acquisition and therefore reflect ground conditions at that time.

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 662829
W° Bound: -124.656
E° Bound: -120.306
N° Bound: 42.055
S° Bound: 34.921

Extent Group 1 / Time Frame 1

CC ID: 662828
Time Frame Type: Range
Start: 2004-01-01
End: 2004-12-31

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Grid Representation 1

CC ID: 662817
Dimension Count: 2
Cell Geometry: Area
Transformation Parameters Available?: No

Axis Dimension 1

Dimension Type: Row
Size: 3001

Axis Dimension 2

Dimension Type: Column
Size: 3001

Access Information

Security Class: Unclassified
Data Access Procedure:

This data is under an End User License Agreement and is distributed by the Originator once the requestor contacts

the Office for Coastal Management at the above email address or telephone number.;

Data Access Constraints:


Data Use Constraints:

End User License Agreement



CC ID: 720914
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 662863
Activity Date/Time: 2017-11-03

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 662862
Activity Date/Time: 2017-11-14

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

Activity Log 3

CC ID: 718421
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 720913
Activity Date/Time: 2018-02-13

Partial upload to move data access links to Distribution Info.

Technical Environment


This data is delivered on interoperable media with metadata. The data set was developed on

a Microsoft Windows system using Intermap's propriatory Interferometric Editing System (IES).

Data Quality


Calculation of the digital elevation model is described in the Intermap Technologies Core Product

Handbook User's Guide. <URL:>

Horizontal Positional Accuracy:

All data products are 2 meters RMSE or better in areas of unobstructed flat ground.

Vertical Positional Accuracy:

1 meter RMSE or better in areas of unobstructed flat ground.

Completeness Report:

Coverage maps are provided for each acquisition.


Conceptual Consistency:



Process Steps

Process Step 1

CC ID: 662815

This DEM data product was derived using Intermap Technologies airborne interferometric SAR data

acquisition system. The flying height is 32,000 feet Above Mean Sea Level. The primary look direction is West. Areas of

missing data are interpolated using continuous curvature spline over non-data areas. Most incidences of non-data areas

are due to radar shadow and layover due to steep terrain. Radar shadow is a factor of the local topography. It is often

found in mountainous regions and the urban canyons of built-up areas. Occurrences of non-data areas within a DEM are

dependent on the look direction of the radar. Significant bodies of water are assigned an elevation which corresponds to

the shoreline. Areas of null data are assigned the value -10000.

Process Date/Time: 2005-03-22 00:00:00

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity 5 meter posting grid cell

Catalog Details

Catalog Item ID: 49440
GUID: gov.noaa.nmfs.inport:49440
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:13+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2018-02-13
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-02-13
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-02-13