Dane County (WI) 2003 Six-Inch Resolution Digital Orthophotography

Metadata also available as

Frequently-anticipated questions:


What does this data set describe?

    Title:
    Dane County (WI) 2003 Six-Inch Resolution Digital Orthophotography
    Abstract:
    Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The Fly Dane 2003 six-inch resolution digital orthophotos are a mosaicked raster data set derived from black and white aerial photographs. The aerial photography was acquired in the spring of 2003 at a scale of 1:10,000 (1"=833'). The aerial photographs were used to create 1"=100' scale digital orthophotos at six-inch ground resolution covering limitied areas in Dane County and consist of 26 one square mile tiles. See the Dane County Land Information Office website [<http://dc-web.co.dane.wi.us/lio/lio_home_page.htm>] for a graphic of the coverage area.

  1. How should this data set be cited?

    Dane County Land Information Office and Fly Dane Partnership, 2003, Dane County (WI) 2003 Six-Inch Resolution Digital Orthophotography: Dane County Land Information Office, Madison, WI.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -89.83909
    East_Bounding_Coordinate: -89.00840
    North_Bounding_Coordinate: 43.29414
    South_Bounding_Coordinate: 42.84499

  3. What does it look like?

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

    Beginning_Date: 15-Mar-2003
    Ending_Date: 29-Apr-2003
    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?

      Indirect_Spatial_Reference: None
      This is a Raster data set. It contains the following raster data types:
      • Dimensions, type pixel

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

      The map projection used is Lambert Conformal Conic.

      Projection parameters:
      Standard_Parallel: 43.230556
      Standard_Parallel: 42.908333
      Longitude_of_Central_Meridian: -89.422222
      Latitude_of_Projection_Origin: 41.75
      False_Easting: 247193.294400
      False_Northing: 0

      Planar coordinates are encoded using Row and Column
      Abscissae (x-coordinates) are specified to the nearest 0.5
      Ordinates (y-coordinates) are specified to the nearest 0.5
      Planar coordinates are specified in meters

      The horizontal datum used is User_Defined_Datum.
      The ellipsoid used is User_Defined_Spheriod.
      The semi-major axis of the ellipsoid used is 6378407.621.
      The flattening of the ellipsoid used is 1/298.269877.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    Each pixel in the digital image contains a value representing relative brightness or radiance(0-255 for this 8-bit imagery.) Each pixel represents a 1 square foot ground area.
    Entity_and_Attribute_Detail_Citation: Not available


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?

    Dane County Land Information Office
    c/o Fred Iausly
    Senior GIS Analyst
    Room 520; 210 Martin Luther King Jr. Blvd
    Madison, WI 53703
    USA

    (608) 266-4398 (voice)
    (608) 266-1242 (FAX)
    iausly@co.dane.wi.us

    Hours_of_Service: Normal Business Hours (8:00am - 4:30pm)
    Contact_Instructions:
    Additional Contact Persons: Tim Confare (Senior GIS Analyst) (608) 267-1598, Diann Danielsen (Land Information Office Manager) (608) 266-4942


Why was the data set created?

These data are used for a number of purposes including base mapping, selection of photo-identifiable features, registration and adjustment of other vector data sets, onscreen digitizing and as an image backdrop for mapping, exhibits and informational materials. The orthophotography, with the addition of supplemental photo control, supported the development of a more detailed digital terrain model (DTM) and 2-foot contours.


How was the data set created?

  1. From what previous works were the data drawn?

    Dane County (source 1 of 1)
    Dane County Land Information Office, Unknown, Dane County (WI) 2003 1:10000 Scale BW Aerial Photography.

    Source_Scale_Denominator: 20000
    Source_Contribution:
    The photo diapositives were digitally scanned at 15 microns and photogrammetrically processed to produce the final imagery and products. (Fly Dane AT Report, Ayres Associates)

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

    Date: 2003 (process 1 of 1)
    In the spring of 2003, over 75 black and white photos were taken at a photo scale of 1:10,000 and a flight altitude of 5,000 feet above terrain. The photo diapositives were digitally scanned at 15 microns and photogrammetrically processed and tone balanced to produce the final imagery and products. (Fly Dane AT Report, Ayres Associates)

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


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

  1. How well have the observations been checked?

    None

  2. How accurate are the geographic locations?

    The data set meets the National Map Accuracy Standards for the scale 1:1,200. The horizontal accuracy is +/- 3 feet for well defined points, at a ninety percent confidence level. (Fly Dane Accuracy Report, Ayres Associates)

  3. How accurate are the heights or depths?

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

    The Fly Dane six-inch digital images cover limited areas of Dane County, WI, and are divided into 26 one square mile tiles. For a graphic on the coverage area, see the Dane County Land Information website [URL: <http://dc-web.co.dane.wi.us/lio/lio_home_page.htm>]

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

    This image is a mosaicked raster data set. Each pixel in the digital image contains a value representing relative brightness or radiance (0 - 255 for this 8-bit imagery.) Each pixel represents thirty-six square inches of ground area.


How can someone get a copy of the data set?

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

Access_Constraints: Data is copyright and licensed for use.
Use_Constraints:
Refer to the License Agreement for Dane County Digital Geographic Data Sets.

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

    Dane County Land Information Office
    c/o Fred Iausly
    Senior GIS Analyst
    Room 520; 210 Martin Luther King Jr. Blvd
    Madison, WI 53703
    USA

    (608) 266-4398 (voice)
    (608) 266-1242 (FAX)
    iausly@co.dane.wi.us

    Hours_of_Service: Normal Business Hours (8:00am - 4:30pm)
    Contact_Instructions:
    Additional Contact Persons:: Tim Confare (Senior GIS Analyst) (608) 267-1598, Diann Danielsen (Land Information Office Manager) (608) 266-4942
  2. What's the catalog number I need to order this data set?

    SxxxttICD9 (xxx refers to the numeric town and range designation. For example 506 = T05N R06E - Town of Perry. tt refers to the tile 1 thru 36 within the town.)See <URL:http://dc-web.co.dane.wi.us/lio/orthoproducts.asp> for more information on product coverage and tile description.

  3. What legal disclaimers am I supposed to read?

    The burden for determining 'fitness for use' rests entirely upon the requester/Licensee. Dane County and its co-producers will not be liable in any way for accuracy of the data or for uses other than intended. Dane County assumes no responsibility whatsoever for direct, indirect, special, consequential, exemplary or other damages. Licensee agrees to indemnify, hold harmless and defend Dane County, its employees, agents, representatives and co-producers from any claims, damages, liabilities and expenses arising from Licensee's use of licensed data sets or products derived therefrom.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    An additional cost of $30/hour for staff time plus computer time and media charges is assessed fornon-standard datasets or non-standard data file formats. Prices are subject to change without notice. Fill out the License Agreement for Dane County Digital Geographic Data Sets providing licensing information and custom data requested. See Price/Product list for more information. Mail, fax or phone in the data request. A signed license agreement must be received before data can be released. All requests will be invoiced following delivery of the data.


Who wrote the metadata?

Dates:
Last modified: 06-Aug-2003
Last Reviewed: Aug-2003

Metadata author:
Dane County Land Information Office
c/o Fred Iausly
Senior GIS Analyst
Room 520; 210 Martin Luther King Jr. Blvd
Madison, WI 53703
USA

(608) 266-4398 (voice)
(608) 266-1242 (FAX)
iausly@co.dane.wi.us

Hours_of_Service: Normal Business Hours (8::00am - 4::30pm)
Contact_Instructions:
Additional Contact Persons:: Tim Confare (Senior GIS Analyst) (608) 267-1598, Diann Danielsen (Land Information Office Manager) (608) 266-4942
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.7.33 on Fri Dec 12 14:21:14 2003