2007 Digital Elevation Contours

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Bohannan-Huston, Inc.

Publication_Date: 20080902

Publication_Time: Unknown

Title: NCTCOG 17 County Contours

Edition: 2008

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: NCTCOG 17 County Contours

Issue_Identification: 2008

Publication_Information:

Publication_Place: Albuquerque, NM

Publisher: Bohannan-Huston, Inc.

Online_Linkage: none

Description:

Abstract:

This contour dataset represents a digital surface project covering 17 counties in north central Texas. The contour data are indicated by lines which depict elevations at pre-determined 2.0 foot intervals. The digital surface was developed by autocorrelating elevations from a fixed 8.0 foot ground sample distance. Contours are generalized and smoothed to reduce the number of vertices.

Purpose:

This contour representation, ordered by the North Central Texas Council of Governments (NCTCOG), is intended to aid in planning and engineering studies. It is not intended to furnish measurements accurate enough for engineering design work.

Supplemental_Information:

Neither North Central Texas Council of Governments (NCTCOG), nor Bohannan-Huston, Inc. (BHI) assumes liability for misuse of the data. Data should be used at the scale for which they were intended. No warranty, expressed, or implied, is made by the NCTCOG nor BHI regarding the utility of the data on any other system, nor shall the act of distribution constitute such warranty.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20070222

Beginning_Time: 113531

Ending_Date: 20080831

Ending_Time: 113541

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -98.580350

East_Bounding_Coordinate: -95.806409

North_Bounding_Coordinate: 33.476192

South_Bounding_Coordinate: 31.771103

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: vectorBaseMapsEarthCover

Theme:

Theme_Keyword_Thesaurus: USGS Enterprise Web Thesaurus

Theme_Keyword: contour

Theme_Keyword: elevation

Theme_Keyword: topography

Theme_Keyword: surface

Theme_Keyword: hypsography

Theme_Keyword: DSM/DEM

Theme_Keyword: remote sensing

Place:

Place_Keyword_Thesaurus: Geographic Names Information System

Place_Keyword: US

Place_Keyword: Texas

Access_Constraints: None.

Use_Constraints: None.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Bohannan-Huston, Inc.

Contact_Person: Dennis Sandin

Contact_Position: Senior Vice President & Managing Principal

Contact_Address:

Address_Type: mailing and physical address

Address: 7500 Jefferson St NE

Address: Courtyard I

City: Albuquerque

State_or_Province: NM

Postal_Code: 87109-4335

Country: USA

Contact_Voice_Telephone: 505-798-7925

Contact_Facsimile_Telephone: 505-798-7932

Contact_Electronic_Mail_Address: dsandin@bhinc.com

Hours_of_Service: 8-5 M-Th 8-4:30 F (GMT -7)

Contact_Instructions:

Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.

Data_Set_Credit:

the North Central Texas Council of Governments (NCTCOG) generously funded the creation of the entire dataset.

Security_Information:

Security_Classification_System: United States Department of Defense

Security_Classification: Unclassified

Security_Handling_Description: None.

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.0.1324

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Source stereo images are collected at an elevation of no more than 5500 feet above ground. theoretical design of the photogrammetric flight indicate a vertical accuracy will be achieved for an ASPRS vertical supporting 2.0' contour intervals. Contours have been generalized and smoothed which may slightly affect attributed elevation accuracy for the positional sample.

Logical_Consistency_Report:

Horizontal accuracy of all ground control identified in the contour data shows a displacement of not more than 1.5' (one and a half feet).

Completeness_Report:

Aerotriangulation results for all raw imagery was checked for horizontal accuracy. Digital auto-correlated elevations correspond to the accuracy of the aerotriangulation. NSSDA validation indicates a vertical RMSE of .54' yielding a 95% confidence of 1.06 feet vertical on the digital surface model from where the contours were generated. Subsequent contour generalizing and smoothing will affect the overall positional accuracy of the contours.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process (elevation data, aerotriangulation control and methods, camera calibration, and source imagery parameters).

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 1.5

Horizontal_Positional_Accuracy_Explanation:

Control points that were used to aerotriangulate the positions of the images at time of exposure were identified in the orthorectified images and found to be displaced not more than 1.5 feet. All other ground features therefore should not be displaced from their true locations by more than an average of 1.5 feet.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Bohannan-Huston, Inc

Publication_Date: Unpublished Material

Title: NCTCOG 17 County Contours

Geospatial_Data_Presentation_Form: vector digital data

Source_Scale_Denominator: 12700

Type_of_Source_Media: disc

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20070222

Beginning_Time: 113531

Ending_Date: 20080830

Ending_Time: 113541

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: IMAGE

Source_Contribution:

Raw image data was captured using an Intergraph Digital Mapping Camera (DMC) having a focal length of 120mm, an effective charge coupled device (CCD) array size of 168mm across track (left to right) by 95mm along track (top to bottom), and a pixel size in its panchromatic band of 12 by 12 microns.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Bohannan-Huston, Inc.

Publication_Date: Unpublished Material

Title: Digital Elevation Model

Geospatial_Data_Presentation_Form: raster digital data

Type_of_Source_Media: disc

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20070222

Beginning_Time: 113531

Ending_Date: 20080830

Ending_Time: 113541

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: DEM

Source_Contribution:

Elevation data derived from the same aerial photography, autocorrelated and filtered, was used as input to provide ground elevations for the orthorectification process.

Process_Step:

Process_Description:

Control panels were laid down and their positions recorded with static GPS. Positions were then corrected and network adjusted.

Process_Date: 2007

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Bohannan-Huston, Inc.

Contact_Person: Dennis Sandin

Contact_Position: Senior Vice President & Managing Principal

Contact_Address:

Address_Type: mailing and physical address

Address: 7500 Jefferson St NE

Address: Courtyard I

City: Albuquerque

State_or_Province: NM

Postal_Code: 87109-4335

Country: USA

Contact_Voice_Telephone: 505-798-7925

Contact_Facsimile_Telephone: 505-798-7932

Contact_Electronic_Mail_Address: dsandin@bhinc.com

Hours_of_Service: 8-5 M-Th 8-4:30 F (GMT -7)

Contact_Instructions:

Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.

Process_Step:

Process_Description:

Raw image data was captured using an Intergraph Digital Mapping Camera (DMC) having a focal length of 120mm, an effective charge coupled device (CCD) array size of 168mm across track (left to right) by 95mm along track (top to bottom), and a pixel size in its panchromatic band of 12 by 12 microns. Output images were created using post-processing software which removes lens distortion and pan-sharpens color data with a panchromatic image taken at the same instant. Each image had its histogram clipped to optimize contrast, and was sliced to reduce it from a 12 bit image (4096 values per band) to an 8 bit image (256 values per band).

Process_Date: 2007

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: 3001, Inc.

Contact_Address:

Address_Type: mailing and physical address

Address: 501 Robert Blvd

Address: Floor 2

City: Slidell

State_or_Province: LA

Postal_Code: 70458

Country: USA

Contact_Voice_Telephone: 985-661-3001

Contact_Facsimile_Telephone: 985-649-5082

Process_Step:

Process_Description:

Airborne GPS/IMU data were collected in flight as images were captured and post-processed and network adjusted.

Process_Date: 2007

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: 3001, Inc.

Contact_Address:

Address_Type: mailing and physical address

Address: 501 Robert Blvd

Address: Floor 2

City: Slidell

State_or_Province: LA

Postal_Code: 70458

Country: USA

Contact_Voice_Telephone: 985-661-3001

Contact_Facsimile_Telephone: 985-649-5082

Process_Step:

Process_Description:

Images were aerotriangulated to finalize their external orientation.

Process_Date: 2007

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Bohannan-Huston, Inc.

Contact_Person: Dennis Sandin

Contact_Position: Senior Vice President & Managing Principal

Contact_Address:

Address_Type: mailing and physical address

Address: 7500 Jefferson St NE

Address: Courtyard I

City: Albuquerque

State_or_Province: NM

Postal_Code: 87109-4335

Country: USA

Contact_Voice_Telephone: 505-798-7925

Contact_Facsimile_Telephone: 505-798-7932

Contact_Electronic_Mail_Address: dsandin@bhinc.com

Hours_of_Service: 8-5 M-Th 8-4:30 F (GMT -7)

Contact_Instructions:

Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.

Process_Step:

Process_Description:

Stereo images were processed to automatically generated a digital elevation model. Any non-man made structures and vegetation were removed from the digital surface model. MicroStation design files containing ground elevations were clipped to eliminate overlap between stereomodels and filtered to declassify points that constituted excessively small elevation spikes. The output was saved into four column text files containing each ground elevations coordinates and classification. Text files containing the points for each model were combined into long strips to eliminate spurious edge effects during filtering and processed both manually and via filters to declassify points coincident with structures, vegetation, water, and other features that did not constitute the surface of the ground. The output was saved into LiDAR binary format (.las). LiDAR binary format files were combined into larger sized tiles and an image showing the topography's hillshade was created for each in order to perform further review and classification in TerraScan.

Process_Date: 2007

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Bohannan-Huston, Inc.

Contact_Person: Dennis Sandin

Contact_Position: Senior Vice President & Managing Principal

Contact_Address:

Address_Type: mailing and physical address

Address: 7500 Jefferson St NE

Address: Courtyard I

City: Albuquerque

State_or_Province: NM

Postal_Code: 87109-4335

Country: USA

Contact_Voice_Telephone: 505-798-7925

Contact_Facsimile_Telephone: 505-798-7932

Contact_Electronic_Mail_Address: dsandin@bhinc.com

Hours_of_Service: 8-5 M-Th 8-4:30 F (GMT -7)

Contact_Instructions:

Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.

Process_Step:

Process_Description:

Digital rough contours were generated at 2.0' intervals from the bare Earth autocorrelated surface model.

Process_Date: 2008

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Bohannan-Huston, Inc.

Contact_Person: Dennis Sandin

Contact_Position: Senior Vice President & Managing Principal

Contact_Address:

Address_Type: mailing and physical address

Address: 7500 Jefferson St NE

Address: Courtyard I

City: Albuquerque

State_or_Province: NM

Postal_Code: 87109-4335

Country: USA

Contact_Voice_Telephone: 505-798-7925

Contact_Facsimile_Telephone: 505-798-7932

Contact_Electronic_Mail_Address: dsandin@bhinc.com

Hours_of_Service: 8-5 M-Th 8-4:30 F (GMT -7)

Contact_Instructions:

Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.

Process_Step:

Process_Description:

Three-dimensional rough contours were generalized and smoothed to final presentation. Contours were flattened to 2d and attributed with elevation and typical fields.

Process_Date: 2008

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Bohannan-Huston, Inc.

Contact_Person: Dennis Sandin

Contact_Position: Senior Vice President & Managing Principal

Contact_Address:

Address_Type: mailing and physical address

Address: 7500 Jefferson St NE

Address: Courtyard I

City: Albuquerque

State_or_Province: NM

Postal_Code: 87109-4335

Country: USA

Contact_Voice_Telephone: 505-798-7925

Contact_Facsimile_Telephone: 505-798-7932

Contact_Electronic_Mail_Address: dsandin@bhinc.com

Hours_of_Service: 8-5 M-Th 8-4:30 F (GMT -7)

Contact_Instructions:

Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: C:\Documents and Settings\dsandin\Desktop\ACS_grid.xml

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation:

C:\Documents and Settings\dsandin\Desktop\draft_contour_metadata_v1.0.xml

Cloud_Cover: 0

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 2262

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert Conformal Conic

Lambert_Conformal_Conic:

Standard_Parallel: 32.133333

Standard_Parallel: 33.966667

Longitude_of_Central_Meridian: -98.500000

Latitude_of_Projection_Origin: 31.666667

False_Easting: 1968500.000000

False_Northing: 6561666.666667

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000000

Ordinate_Resolution: 0.000000

Planar_Distance_Units: survey feet

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988

Altitude_Distance_Units: feet

Altitude_Encoding_Method: Attribute values

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Elevation

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: GEODB_OID

Attribute:

Attribute_Label: OBJECTID

Attribute:

Attribute_Label: ID

Attribute:

Attribute_Label: COUNTY

Attribute:

Attribute_Label: SID_2005

Attribute:

Attribute_Label: SID_2007

Attribute:

Attribute_Label: CADTYPE

Attribute:

Attribute_Label: LEVEL

Attribute:

Attribute_Label: COLOR

Attribute:

Attribute_Label: LINEWT

Attribute:

Attribute_Label: LAYER

Attribute:

Attribute_Label: HANDLE

Attribute:

Attribute_Label: REFNAME

Attribute:

Attribute_Label: CLASS

Attribute:

Attribute_Label: LINETYPE

Attribute:

Attribute_Label: LTSCALE

Attribute:

Attribute_Label: WIDTH

Attribute:

Attribute_Label: THICKNESS

Attribute:

Attribute_Label: CADANGLE

Attribute:

Attribute_Label: CADMODEL

Attribute:

Attribute_Label: EXTX

Attribute:

Attribute_Label: EXTY

Attribute:

Attribute_Label: EXTZ

Attribute:

Attribute_Label: SCALEX

Attribute:

Attribute_Label: SCALEY

Attribute:

Attribute_Label: SCALEZ

Attribute:

Attribute_Label: QROTW

Attribute:

Attribute_Label: QROTX

Attribute:

Attribute_Label: QROTY

Attribute:

Attribute_Label: QROTZ

Attribute:

Attribute_Label: ELEVATION

Attribute:

Attribute_Label: FILLCOLOR

Attribute:

Attribute_Label: GGROUP

Attribute:

Attribute_Label: LYRNAME

Attribute:

Attribute_Label: LYRNUM

Attribute:

Attribute_Label: LVLDESC

Attribute:

Attribute_Label: LYRCOLOR

Attribute:

Attribute_Label: LYRLINEWT

Attribute:

Attribute_Label: LYRLNTYPE

Attribute:

Attribute_Label: LYRFRZN

Attribute:

Attribute_Label: LYRLOCK

Attribute:

Attribute_Label: LYRON

Attribute:

Attribute_Label: LYRVPFRZN

Attribute:

Attribute_Label: LVLPLOT

Attribute:

Attribute_Label: LYRHANDLE

Attribute:

Attribute_Label: TXTVALUE

Attribute:

Attribute_Label: TXTMEMO

Attribute:

Attribute_Label: TXTHT

Attribute:

Attribute_Label: TXTROTATE

Attribute:

Attribute_Label: TXTWIDTH

Attribute:

Attribute_Label: TXTOBLIQUE

Attribute:

Attribute_Label: TXTGENTYPE

Attribute:

Attribute_Label: TXTJUST

Attribute:

Attribute_Label: VERTALIGN

Attribute:

Attribute_Label: TXTSTYLE

Attribute:

Attribute_Label: TXTFONT

Attribute:

Attribute_Label: TXTBOXHT

Attribute:

Attribute_Label: TXTBOXWD

Attribute:

Attribute_Label: TXTREFWD

Attribute:

Attribute_Label: TXTATTACH

Attribute:

Attribute_Label: TXTDIR

Attribute:

Attribute_Label: LNSPACE

Attribute:

Attribute_Label: SPACEFACT

Attribute:

Attribute_Label: DOCNAME

Attribute:

Attribute_Label: DOCPATH

Attribute:

Attribute_Label: DOCTYPE

Attribute:

Attribute_Label: DOCVER

Attribute:

Attribute_Label: XDLIST

Attribute:

Attribute_Label: SHAPE_LENG

Attribute:

Attribute_Label: SHAPE_AREA

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Overview_Description:

Entity_and_Attribute_Overview:

ELEVATION - contains NAVD 88 elevation information for interval in units of feet.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Shelley Broyles

Contact_Organization: North Central Texas Council of Governments

Contact_Position: GIS Analyst

Contact_Address:

Address_Type: mailing address

Address: P.O. Box 50888

City: Arlington

State_or_Province: TX

Postal_Code: 76005-5888

Country: USA

Contact_Address:

Address_Type: physical address

Address: Centerpoint Two

Address: 616 Six Flags Dr

City: Arlington

State_or_Province: TX

Postal_Code: 76011

Country: USA

Contact_Voice_Telephone: 817-695-9156

Contact_Facsimile_Telephone: 817-640-4428

Resource_Description:

These contours created from aerial photogrammetry from the year 2007 are available for purchase order over the Internet. They are in .shp format which is a de facto standard for most GIS software packages.

Distribution_Liability:

The North Central Texas Council of Governments (NCTCOG) provides these geographic data "as is" and makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. NCTCOG further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of Bohannan-Huston, Inc. (BHI) and served by NCTCOG, no warranty, expressed or implied, is made by NCTCOG or BHI regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall NCTCOG or BHI have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by NCTCOG.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: SHP

Format_Version_Number: 6.0

Format_Specification: ESRI ArcGIS SHP

Format_Information_Content: vector line

File_Decompression_Technique: no compression applied

Transfer_Size: 6Mb

Digital_Transfer_Option:

Offline_Option:

Offline_Media: DVD-ROM

Recording_Capacity:

Recording_Density: 4.7

Recording_Density_Units: Gigabytes

Recording_Format: ISO 9660 with Rock Ridge Extensions

Fees: Call for current prices

Ordering_Instructions: <https://marketplace.dfwmaps.com/Help>

Custom_Order_Process: <https://marketplace.dfwmaps.com/Help>

Available_Time_Period:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2008

Metadata_Reference_Information:

Metadata_Date: 20080908

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Dennis Sandin

Contact_Organization: Bohannan-Huston, Inc.

Contact_Position: Vice President

Contact_Address:

Address_Type: mailing and physical address

Address: 7500 Jefferson St NE

Address: Courtyard I

City: Albuquerque

State_or_Province: NM

Postal_Code: 87109-4335

Country: USA

Contact_Voice_Telephone: 505-798-7925

Contact_Facsimile_Telephone: 505-798-7932

Contact_Electronic_Mail_Address: dsandin@bhinc.com

Hours_of_Service: 8-5 M-Th 8-4:30 F (GMT -7)

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile