Mosaic of Illinois Digital Orthophoto Quadrangles in UTM Zone 15, NAD83, 2005 Photography

Metadata also available as - [Questions & Answers] - [Parseable text] - [XML]

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Originator: Illinois State Geological Survey
Originator:
Surdex Corporation and Science Applications International Corporation (SAIC)
Publication_Date: 20060906
Title:
Mosaic of Illinois Digital Orthophoto Quadrangles in UTM Zone 15, NAD83, 2005 Photography
Edition: 20060906
Geospatial_Data_Presentation_Form: remote-sensing image
Series_Information:
Series_Name: ISGS GIS Database
Issue_Identification: GISDB.IL_DOQ_2005_MOSAIC_UTM15_RAS
Publication_Information:
Publication_Place: Champaign, IL
Publisher: Illinois State Geological Survey
Online_Linkage: <http://www.isgs.illinois.edu/>
Online_Linkage: <http://illinois.edu>
Description:
Abstract:
This data set is an SDE raster mosaic of DOQs from year 2005 that occur within the UTM Zone 15 portion of Illinois. The data are stored in the "as delivered" spatial reference of UTM Zone 15, NAD83 with a 0.5-meter ground resolution. This raster mosaic can be used in conjunction with the raster mosaics named IL_DOQ_2005_MOSAIC_UTM16_RAS and IL_CUA_2005_MOSAIC_UTM16_RAS to provide full 2005 orthophoto coverage of Illinois.

The raster mosaic was constructed using uncompressed GeoTIFF images and ArcSDE 9.1 command-line functions. It is stored in the SDE database with LZ77 compression. The original image tiles were not resampled in the mosaicking process and had exact side-by-side pixel registration. This means the SDE raster layer preserves the exact pixel location and cell values of the source images. The data consumes 173 gigabytes of disk space in 5,270,858 database rows. The in-processing occurred over the period 20060530 to 20060906 as the data were delivered is several lots by the USGS.

[Begin excerpt from USGS metadata]

A 0.5 meter resolution panchromatic (B and W) USGS Digital Orthophoto Quarter-quadrangle (DOQQ) (sic) A DOQQ is a raster image in which displacement in the image caused by sensor orientation and terrain relief has been removed. A DOQQ combines the image characteristics of a photograph with the geometric qualities of a map. The geographic extent of the DOQQ is equivalent to a quarter of a 7.5-minute map (3.75 minutes of latitude and longitude) with overedge . The overedge ranges from a minimum of 50 meters to 300 meters beyond the extremes of the primary and secondary corner ticks. DOQQs are produced with a 1-meter ground sample distance (GSD) and are cast on the Universal Transverse Mercator (UTM) projection on the North American Datum of 1983 (NAD83). Primary (solid) and secondary (dashed) corner ticks are burned into the image to indicate the geographic corners of the DOQQ. The primary ticks always show the NAD83 corners. The secondary ticks show either the NAD27 or the local horizontal datum in use in a specific area (e.g. the Puerto Rico datum, the Hawaiian datum). Each DOQQ is produced to meet a National Map Accuracy Standard (NMAS) for 1:12000 scale maps (10.16 meters radial error at a 90% probability). Each DOQQ is formatted with a variable length ASCII header followed by a series of 8-bit image data lines. The ASCII header is padded to equal the length of one image line. The header contains information on file organization, display (samples and lines), georeferencing, and production sources. The file structure for a native format DOQQ is analogous to a raw raster BIL (panchromatic) or BIP (RGB color). DOQQs are nominally produced from National Aerial Photography Program (NAPP) source imagery flown at 20,000 feet above average ground using a single source image for each DOQQ. NAPP imagery is flown leaf-off in deciduous vegetation regions.

[End excerpt from USGS metadata]

The radiometric image brightness values are stored as 256 gray levels ranging from 0 to 255.

Purpose:
[Begin excerpt from USGS metadata]

This data depicts geographic features on the surface of the earth. DOQQs serve a variety of purposes, from interim base maps to field references for earth science investigations and analysis. The DOQQ is useful as a layer in a geographic information system (GIS) and as a tool for performing digital map revision. DOQQs form the medium-resolution image base for The National Map

[End excerpt from USGS metadata]

These data are appropriate for use in local and regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set serves as an important base cartographic element for many types of maps and has been widely distributed and used outside the ISGS. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a reference base layer for maps, the data set has no legal basis in the definition of boundaries or property lines.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20050218
Ending_Date: 20050504
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -91.611664
East_Bounding_Coordinate: -89.784605
North_Bounding_Coordinate: 42.594868
South_Bounding_Coordinate: 37.933055
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: DOQ
Theme_Keyword: DOQQ
Theme_Keyword: digital orthophoto
Theme_Keyword: digital orthophotoquad
Theme_Keyword: digital image map
Theme_Keyword: aerial photograph
Theme_Keyword: rectified photograph
Theme_Keyword: rectified image
Theme_Keyword: orthophoto
Theme_Keyword: quarter-quadrangle orthophoto
Theme_Keyword: 0.5-meter orthophoto
Theme_Keyword: 3.75- x 3.75-minute orthophoto
Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1977, Countries, dependencies,areas of special sovereignty, and their principal administrative divisions (Federal Information Processing Standard 10-3): Washington, D.C., National Institute of Standards and Technology.
Place_Keyword: US
Place_Keyword: IL
Access_Constraints:
ISGS information must be obtained directly from the ISGS or from an authorized distributor. Be aware that ISGS information obtained from an unauthorized third party may have been altered subsequent to original distribution, or may no longer be current.

Any access to these data, Web sites, computer systems, electronic services, and electronic networks is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice.

Links to these are provided in the Cross References section.

Use_Constraints:
ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved.  University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section.

Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, isgs@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage.

Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section.

Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data.  Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor.

The data do not replace the need for detailed site-specific studies.

Point_of_Contact:
Contact_Information:
Contact_Instructions: Please refer to the Distribution Information section.
Native_Data_Set_Environment: ArcSDE 9.1 on Oracle 10g
Cross_Reference:
Citation_Information:
Title: ISGS Terms of Use
Online_Linkage: <http://www.isgs.illinois.edu>
Cross_Reference:
Citation_Information:
Title: University of Illinois Web Privacy Notice
Online_Linkage: <http://www.vpaa.uillinois.edu/policies/web_privacy.cfm>
Cross_Reference:
Citation_Information:
Title:
University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4)
Online_Linkage: <http://www.uillinois.edu/trustees/rules.cfm#sec34>
Cross_Reference:
Citation_Information:
Title:
Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign
Online_Linkage: <http://www.fs.uiuc.edu/cam/CAM/viii/viii-1.1.html>

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
For original, uncompressed DOQs (GeoTIFF format) as delivered by USGSand Surdex:

[Begin excerpt from USGS metadata]

The digital dodging software developed by Surdex is used to counter the effects of haze and sun angle illumination on the film photography. This procedure has been proven to provide a distinct advantage in minimizing the need for extensive radiometric balancing and improves automatic pass/tie point collection during the aerotriangulation phase. The net affect of this program is to drive the source image closer to a histogram with a nearly Gaussian distribution. The output of this program will always produce an image with full dynamic range, nearly regardless of the source image. Minimal radiometric balancing was achieved using Inpho's Ortho Vista software.

[End excerpt from USGS metadata]

Logical_Consistency_Report:
[Begin excerpt from USGS metadata]

All DOQQ header data and image file sizes are validated using USGS software before being archived. This validation process ensures correct physical format and field values for header elements. Logical relationships between header elements are tested. Overlap regions between individual DOQQs are visually inspected for excessive horizontal displacement.

[End excerpt from USGS metadata]

No subsequent logical validation has been performed.

Completeness_Report:
Regarding original DOQs "as delivered" by USGS:

[Begin excerpt from USGS metadata]

DOQQ images are visually inspected for completeness to ensure that no gaps or image misplacements exist within the 3.75-minute image area or the overedge coverage. DOQQs can be derived by mosaicking multiple images to ensure complete coverage. and between adjacent images. (sic) DOQQs are nominally produced from National Aerial Photography Program (NAPP) source imagery flown at 20,000 feet above average ground using a single source image for each DOQQ. NAPP imagery is flown leaf-off in deciduous vegetation regions. Source imagery is nominally cloud free. Coastal areas and international boundary regions may have areas without images (void areas) in parts of the coverage. These void areas have a radiometric value of either zero (black) or 128 (uniform gray). DOQQs nominally are produced with overedge coverage. This coverage is variable and may range from a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary or secondary corners. The resulting DOQQ is a rectangle whose size may vary in relation to adjoining DOQQs.

[End excerpt from USGS metadata]

Regarding DOQ mosaic as subsequently processed by ISGS:

All areas in the UTM 15 portion of the state of Illinois are represented.

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
For DOQs "as delivered" by USGS:

[Begin excerpt from USGS metadata]

Random selection of 5% of the DOQQ tiles for excessive edge match offset.

[End excerpt from USGS metadata]

For SDE DOQ mosaic developed by ISGS:

The pixels preserve the exact position of the source imagery. This was verified in ArcMap software by overlaying a random sample of 10% of the source images with the SDE raster mosaic, zooming into one or more corners of the source image to a scale of 1:10 or greater, and comparing the locations of the corners of the corner-most pixel in the source image to the corresponding pixel in the raster mosaic.

Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value:
Horizontal accuracy meets National Map Accuracy Standards for 1:12,000-scale maps
Horizontal_Positional_Accuracy_Explanation:
[Begin excerpt from USGS metadata]

Various checks of Digital Elevation Models and Digital Orthophotos from a variety of other existing sources, including but not limited to previous projects done by Surdex.

[End excerpt from USGS metadata]

Values may vary from quarter-quad to quarter-quad.

Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Surdex Corporation
Publication_Date: 2005
Title: Various NAPP photographs covering the mosaicked area
Geospatial_Data_Presentation_Form: remote-sensing image
Source_Scale_Denominator: 40000
Type_of_Source_Media: stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20050218
Ending_Date: 20050504
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: PHOTO
Source_Contribution:
[Begin excerpt from USGS metadata]

Stable-base aerial photography acquired at 1:40,000 scale using only metric aerial cameras with USGS calibration certificates. Provides the imagery for the digital orthoimage. Film is panchromatic.

[End excerpt from USGS metadata]

Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2003
Title: USGS 1-arcsec NED
Type_of_Source_Media: Hard Drive
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1929
Ending_Date: 1998
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: DEM
Source_Contribution:
[Begin excerpt from USGS metadata]

USGS 1-arcsec National Elevation Dataset for the entire United States that was broken down into 1 degree cells.

[End excerpt from USGS metadata]

Source_Information:
Source_Citation:
Citation_Information:
Originator: Surdex Corporation
Publication_Date: 2005
Title: Project Photo Control
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20050218
Ending_Date: 20050504
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: CONTROL
Source_Contribution:
[Begin excerpt from USGS metadata]

Horizontal and vertical control used to establish positions and elevations for reference and correlation purposes and as input to the aerotriangulation process. Control consists of both Airborne GPS to provide camera station positions and photoidentifiable surveyed ground control for ground reference.

[End excerpt from USGS metadata]

Source_Information:
Source_Citation:
Citation_Information:
Originator: United States Geological Survey
Publication_Date: 2005
Title: GeoTIFF Collection on Hard Drive
Geospatial_Data_Presentation_Form: remote-sensing image
Type_of_Source_Media: hard drive
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2005
Source_Currentness_Reference: ground condition
Source_Contribution:
The GeoTIFF images were delivered to ISGS from USGS on a series of hard drives.
Process_Step:
Process_Description:
The production procedures, instrumentation, hardware and software used in the collection of standard USGS DOQ's vary depending on systems used at the contract, cooperator or USGS production sites. The majority of DOQ datasets are acquired through government contract. This process step describes the process used by the contractor (Surdex) for this USGS DOQ data set. Additional detail is included in subsequent processing steps for processing done by the ISGS.

[Begin excerpt from USGS metadata]

Source imagery was collected using four cameras (two Wild RC-30 and two Jena LMK), all have 6" focal lengths and a current calibration by USGS. The imagery was processed by HAS Images Inc. in Dayton, OH. Airbone GPS data was processed by Surdex Corporation. Image negatives were scanned at 10-micrometer resolution on Leica DSW Image Scanners and dodge using SurDodge software by Surdex. The scanned images were then used as input, along with Airborne GPS data and camera calibration data in Intergraph's ImageStation Automatic Triangulation (ISAT) for point mensuration. An assessment of the USGS National Elevation Dataset (NED) revealed several areas of insufficient data, at which other DEM sources obtained by Surdex was (sic) used. The aero triangulation parameter data, used with the scanned and dodged imagery were orthorectified using the modified elevation models and Surdex orthorectification software. Some orthorectified images were then mosaicked, if necessary, to reduce minor image defects. Radiometric balancing achieved using Inpho's OrthoVista, as necessary, to produce a consistent image tone for DOQQs. Product tiles were then extracted and converted to GeoTIFF format written to hard drive for delivery.

[End excerpt from USGS metadata]

The Surdex processing was done on LH Systems DSW700 Film Scanners, Surdex SurDodge Software, Intergraph's ISAT v04.04.17, Surdex Snoop tool, Surdex DOQQDB Production Software, Surdex developed orthorectification software, Inpho Orthovista software v4.0, Windows 2000 and Windows XP Operating System. SAIC QVerify V0.1 Software, SAIC QSideview V0.1., SUNW Ultra-4, Solaris OS V5.9.

Process_Date: range 20051212 - 20060728

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 1028511
Column_Count: 284005
Vertical_Count: 1

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 15
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -93.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.500000
Ordinate_Resolution: 0.500000
Planar_Distance_Units: meters
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:

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
[Begin excerpt from USGS metadata]

Panchromatic orthoimagery is organized in a single channel. Each pixel is assigned a gray-scale value from 0-255 with 0 representing black and 255 representing white. Areas where data is incomplete due to lack of full image coverage are represented with the numeric value of 0 or 128.

[End excerpt from USGS metadata]

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

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
Contact_Address:
Address_Type: mailing and physical address
Address: 615 East Peabody Drive
City: Champaign
State_or_Province: Illinois
Postal_Code: 61820
Country: USA
Contact_Voice_Telephone: 217-333-4747
Contact_TDD/TTY_Telephone: 217-785-0211
Contact_Electronic_Mail_Address: isgs@isgs.illinois.edu
Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
Distribution_Liability:
Refer to the Legal Notices of Terms and Conditions of the University of Illinois Web Privacy Policy (there is a link in the Cross References section) for policy statements regarding the following:

Disclaimer of Liability Disclaimer of Warranties and Accuracy of Data Disclaimer of Endorsement Disclaimer for External Links Disclaimer of Duty to Continue Provision of Data Security Choice of Law

By obtaining these data you agree to the provisions of the University of Illinois Web Privacy Policy, regardless of the manner in which the information was obtained.

Technical_Prerequisites:
The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, ESRI formats can be imported into many different GIS software packages. It is expected that customers who obtain these data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind.

Metadata_Reference_Information:
Metadata_Date: 20090224
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Instructions: Please refer to the Distribution Information section.
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints:
The access constraints as stated for the data apply also to the metadata. Refer to the Access Constraints section of the Identification Information section.
Metadata_Use_Constraints:
The use constraints as stated for the data apply also to the metadata. Refer to the Use Constraints section of the Identification Information section.
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Lineage:

Illinois Natural Resources Geospatial Data Clearinghouse

Generated by mp version 2.8.25 on Wed Apr 08 13:13:13 2009