Dane County (WI) 1995 One-Meter Resolution Digital Orthophotography

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Frequently-anticipated questions:


What does this data set describe?

    Title:
    Dane County (WI) 1995 One-Meter Resolution Digital Orthophotography
    Abstract:
    The orthophotos are a raster data set derived from 1:31,680 scale aerial photography that was flown in the spring of 1995. It was flown to provide full 1-meter coverage of the county, replacing the 2-meter USGS digital orthophoto quarterquad mapping that covered only part of the county. The data are divided into 35 township-based data sets.

  1. How should this data set be cited?

    Dane County Land Information Office, Dane County (WI) 1995 One-Meter Resolution Digital Orthophotography: Dane County Land Information Office, Madison, WI.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -89.846253
    East_Bounding_Coordinate: -88.988509
    North_Bounding_Coordinate: 43.310493
    South_Bounding_Coordinate: 42.841087

  3. What does it look like?

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

    Calendar_Date: 30-Apr-1995
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: raster digital data

  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.

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

      The map projection used is Lambert Conformal Conic.

      Projection parameters:
      Standard_Parallel: 42.908333
      Standard_Parallel: 43.230556
      Longitude_of_Central_Meridian: -89.422222
      Latitude_of_Projection_Origin: 41.750000
      False_Easting: 811000.000044
      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.001063
      Ordinates (y-coordinates) are specified to the nearest 0.001063
      Planar coordinates are specified in survey feet

      The horizontal datum used is D_User_Defined.
      The ellipsoid used is User_Defined_Spheroid.
      The semi-major axis of the ellipsoid used is 6378407.621000.
      The flattening of the ellipsoid used is 1/298.269877.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    The attribute information found in this dataset was collected by the Dane County Land Information Office (LIO).
    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 application, exhibits and informational materials. The development of the orthophotography, also resulted in the production of a Digital Terrain Model (DTM), road centerline file, drainage vectors and 10-foot contours.


How was the data set created?

  1. From what previous works were the data drawn?

    Dane County (source 1 of 1)
    Southwestern Wisconsin Seven-County Digital Ortho Consortium, Dane County Digital Orthophoto Project: Dane County Land Information Office, Madison, Wisconsin.

    Source_Scale_Denominator: 4800
    Source_Contribution:
    Ayres Associates, Madison, WI, under contract to Dane County, WI, provided the 1995 aerial photos, and subsequent digital orthophotography and related products.

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

    (process 1 of 1)
    Forty-four photo control points were established across Dane County, including additional control derived from USGS 7.5 minute quadrangle maps. In the spring of 1995, black and white aerial photos were taken of Dane County at a photo scale of 1:31,680 and a flight altitude of 15,840 feet. Photo diapositives were digitally scanned at 15 microns and photogrammetrically processed to produce the final imagery and products.

    Person who carried out this activity:

    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
  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 orthophoto project was designed to meet National Map Accuracy Standards at 1:4,800 scale. Forty-four control points were targeted in an X or T configuration. Control station positions were developed to First Order FGDC classification standards and specifications whenever possible. The horizontal positional accuracy is approximately 10 feet.

  3. How accurate are the heights or depths?

    Forty-four control points were targeted in an X or T configuration. Control station positions were developed to First Order FGDC classification standards whenever possible. Supplemental vertical control was derived from USGS 7.5 minute quadrangle map. The vertical positional accuracy is approximately 5 feet.

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

    The digital images cover all of Dane County, WI, and are divided up by township with no gaps or omissions.

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

    Each pixel in the digital image contains a value representing relative brightness. Each pixel represents 1 meter on the ground. This imagery is a raster data set.


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. <URL:http://www.co.dane.wi.us/lio/gis/licenseaggreement.pdf>

  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?

    Txxx00D9 (xxx refers to the numeric town and range designation. For example 506 = T05N R06E - Town of Perry.)

  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 there from.

  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 for non-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: 12-Apr-2004

Metadata author:
Dane County Land Information Office
c/o Fred Iausly
Senior GIS Analyst
Room 520; 210 Martin Luther King Jr. Blvd
Madison, WI 53709
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 Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:


Generated by mp version 2.7.33 on Mon Apr 12 15:53:19 2004