Mosaic of Illinois National Agriculture Imagery Program (NAIP) Orthoimagery in UTM Zone 15, NAD83, 2004 Photography

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Frequently-anticipated questions:


What does this data set describe?

Title:
Mosaic of Illinois National Agriculture Imagery Program (NAIP) Orthoimagery in UTM Zone 15, NAD83, 2004 Photography
Abstract:
This data set is an ArcSDE raster mosaic of orthorectified color (3-band) aerial imagery for the UTM Zone 15 portion of the state of Illinois, collected as part of the National Agriculture Imagery Program (NAIP). The data are stored in the "as delivered" spatial reference of UTM Zone 15, NAD83 with a 2-meter ground resolution.

The originator of the input image tiles is the USDA-FSA-APFO Aerial Photography Field Office.

The mosaic was constructed using georeferenced GeoTIFFs with ArcCatalog 9.1, ArcSDE 9.1 and Oracle 10g. They are stored in the SDE database with LZ77 (non-lossy) compression and exact pixel registration to the original images. Individual quarter-quadrangle image tiles overlapped with each other. The overlap areas were overwritten as additional tiles were mosaicked. The raster consumes 40 gigabytes in the SDE database and has 1.1 million database rows.

If viewed in ArcMap, the best rendering (i.e. most true to actual wavelength data) can be obtained by setting the symbology to use a maximum-minimum stretch (or no stretch). Do not set the display to use any kind of histogram function - this attempts to read every row from the database and will freeze your software.

[Begin excerpt from original metadata]

NAIP acquires digital ortho imagery during the agricultural growing seasons in the continental U.S. A primary goal of the NAIP program is to enable availabilty of ortho imagery within a year of acquisition. NAIP provides two main products: 1 meter ground sample distance (GSD) ortho imagery rectified to a horizontal accuracy of within +/- 3 meters of reference digital ortho quarter quads (DOQQS) from the National Digital Ortho Program (NDOP); and, 2 meter GSD ortho imagery rectified to within +/- 20 meters of reference DOQQs. The tiling format of NAIP imagery is based on a 3.75' x 3.75' quarter quadrangle with a 360 meter buffer on all four sides. NAIP quarter quads are rectified to the UTM coordinate system NAD83. NAIP imagery can obtain as much as 10% cloud cover per tile.

[End excerpt from original metadata]

  1. How should this data set be cited?

    Illinois State Geological Survey, and USDA-FSA-APFO Aerial Photography Field Office, 20070129, Mosaic of Illinois National Agriculture Imagery Program (NAIP) Orthoimagery in UTM Zone 15, NAD83, 2004 Photography: ISGS GIS Database IL_NAIP_2004_MOSAIC_UTM15_RAS, Illinois State Geological Survey, Champaign, IL.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -91.613073
    East_Bounding_Coordinate: -89.784782
    North_Bounding_Coordinate: 42.594869
    South_Bounding_Coordinate: 37.933145

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 2004
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: remote-sensing image

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 257122 x 71056 x 1, type Pixel

    2. What coordinate system is used to represent geographic features?

      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 coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 2.000000
      Ordinates (y-coordinates) are specified to the nearest 2.000000
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    [Begin excerpt from original metadata]

    24-bit pixels, 3 band color(RGB) values 0 - 255.

    [End excerpt from original metadata]

    Entity_and_Attribute_Detail_Citation: None.


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Contact_Instructions: Please refer to the Distribution Information section.


Why was the data set created?

This raster can serve a variety of purposes, from interim maps to field references for earth science investigations and analysis. It is a useful GIS layer for comparison of gross changes in ground condition over time, and revision of digital line graphs and topographic maps.

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 can serve as an important base cartographic element for many types of maps. 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.

[Begin excerpt from original metadata]

The 2 meter GSD NAIP is intended as a source for current digital imagery in USDA Field Service Center GIS and for other programs that require imagery acquired during the agricultural growing season where high horizontal accuracy is not required.

[End excerpt from original metadata]


How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    USDA-FSA-APFO Aerial Photography Field Office, 2005, Collection of NAIP image tiles for Illinois, 2004 photography:.

    Other_Citation_Details:
    The collection included 4163 2-meter resolution, georeferenced, color (3-band) GeoTIFF images, 970 of which are in UTM Zone 15 in Illinois.
    Type_of_Source_Media: DLT

  2. How were the data generated, processed, and modified?

    (process 1 of 1)
    No processing steps were included in the original metadata.

    Person who carried out this activity:

  3. What similar or related data should the user be aware of?

    , USDA NAIP Website.

    Online Links:

    , ISGS Terms of Use.

    Online Links:

    , University of Illinois Web Privacy Notice.

    Online Links:

    , University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4).

    Online Links:

    , Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    [Begin excerpt from original metadata]

    No report.

    [End excerpt from original metadata]

    For SDE mosaic developed by ISGS:

    If viewed in ArcMap, the best rendering (i.e. most true to actual wavelength data) can be obtained by setting the symbology to use a maximum-minimum stretch (or no stretch). Do not set the display to use any kind of histogram function - this attempts to read every row from the database and will freeze your software.

  2. How accurate are the geographic locations?

    [Begin excerpt from original metadata]

    The positional accuracy for the digital data is tested by visual comparison to a data source with a higher order of accuracy.

    [End excerpt from original metadata]

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Regarding data "as delivered" by USDA: No information.

    Regarding mosaic as subsequently processed by ISGS: All areas of the UTM Zone 15 portion of Illinois are represented. Overlapping edges of adjacent image tiles were eliminated in the mosaicking process.

  5. How consistent are the relationships among the observations, including topology?

    [Begin excerpt from original metadata]

    NAIP 3.75 minute tile file names are based on the USGS quadrangle naming convention.

    [End excerpt from original metadata]


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

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.

  1. Who distributes the data set? (Distributor 1 of 1)

    Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
    615 East Peabody Drive
    Champaign, Illinois 61820
    USA

    217-333-4747 (voice)
    isgs@isgs.illinois.edu

    Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    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.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    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.


Who wrote the metadata?

Dates:
Last modified: 24-Feb-2009
Metadata author:

Contact_Instructions: Please refer to the Distribution Information section.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Illinois Natural Resources Geospatial Data Clearinghouse

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