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USGS:Biology arrow icon Biological Informatics Program arrow icon Vegetation Characterization Program arrow icon Appomattox Court House National Historical Park arrow icon Orthorectified Photomosaic Leaf-off FAQ Metadata

Orthorectified Photomosaic Leaf-off FAQ Metadata

Frequently-anticipated questions:

What does this data set describe?

Title:
Appomattox Court House National Historical Park Vegetation Mapping Project - Color Infrared Orthorectified Photomosaic Leaf-off
Abstract:
Orthorectified color infrared ERDAS IMAGINE image of Appomattox Courthouse National Historical Park and surrounding parcels. Produced from 42 color infrared photos taken December 18, 2000 in leaf-off conditions. Overall positional accuracy is 1.475 meters (Euclidean distance). This meets the Class 1 NMAS map accuracy standard.
  1. How should this data set be cited?

    North Carolina State University, Center for Earth Observation, 20010622, Appomattox Court House National Historical Park Color Infrared Orthorectified Photomosaic - Leaf-off (ERDAS IMAGINE .img and MrSID Formats).

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -78.8312
    East_Bounding_Coordinate: -78.7715
    North_Bounding_Coordinate: 37.4009
    South_Bounding_Coordinate: 37.3569
    Description_of_Geographic_Extent: Appomattox Courthouse National Historical Park and environs

  3. What does it look like?

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

    Calendar_Date: 18-Dec-2000
    Time_of_Day: 1300
    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 18095 x 19702 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: 17
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -81.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 0.173425
      Ordinates (y-coordinates) are specified to the nearest 0.173425
      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.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    Dataset consists of a raster 3 band color image, each pixel value is between 0-255.
    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)

    • North Carolina State University, Center for Earth Observation

  2. Who also contributed to the data set?

    Melani Harrell, NCSU-CEO

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

    Natural Resources Specialist
    Appomattox Courthouse National Historical Park
    Natural Resources Specialist
    Natural Resources Specialist
    Appomattox Courthouse National Historical Park
    Hwy. 24, P.O. Box 218
    Appomattox, Virginia 24522
    USA

    (804) 352-8987 ext. 28 (voice)
    (804) 352-8330 (FAX)
    Unknown

Why was the data set created?

The dataset was created for Appomattox Courthouse National Historical Park for use in natural resource management.

How was the data set created?

  1. From what previous works were the data drawn?

    aerial photos (source 1 of 1)
    Air Photographics, Inc, Unpublished Material, Aerial photographs of the Appomattox Courthouse National Historical Park.

    Type_of_Source_Media: color infrared aerial photographs
    Source_Scale_Denominator: 6000
    Source_Contribution: Aerial view of Appomattox Courthouse National Historical Park

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

    Date: Apr-2001 (process 1 of 1)
    The aerial photos (42 total) were used to create an orthorectified mosaic using ERDAS IMAGINE and ERDAS Orthobase. The photos were scanned at 600 dpi and imported into IMAGINE. They were then orthorectofied using four USGS DOQQ's and a USGS National Seamless Elevation DEM as reference. The DEM was resampled from 30 meters to 10 meters using ArcInfo 7.2.1. Each photo was entered into an Orthobase photo block and registered to its interior orientation. Tie points were applied and automatic tie points generated and control points were applied in the Orthobase Point Measurement Tool. Once a successful triangulation solution was reached in Orthobase, the orthorectified images were then mosaiced within IMAGINE to form one seamless basemap image for Appomattox Courthouse National Historical Park.

    Person who carried out this activity:

    North Carolina State University, Center for Earth Observation
    NCSU Campus Box 7106
    Raleigh, NC 27695-7106
    USA

    919-515-3430 (voice)
    919-515-3439 (FAX)

    Hours_of_Service: 9:30 am - 6:00 pm

  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?

  2. How accurate are the geographic locations?

    Overall positional accuracy is 1.475 meters (Euclidean distance). This meets the Class 1 NMAS map accuracy standard. Horizontal accuracy was found by assessing 39 points spread throughout the orthorectified image area. These points were identified on the basemap and then were found in the field where their coordinates were taken using a Trimble ProXRS with real time data correction. The field coordinates were then compared to the coordinates from the basemap in ArcView 3.2 to determine positional accuracy.

  3. How accurate are the heights or depths?

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

    Appomattox Courthouse National Historical Park

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

    none

How can someone get a copy of the data set?

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

Access_Constraints: none
Use_Constraints: none

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

    USGS/CSS/Core Science Analytics and Synthesis
    c/o USGS-NPS Vegetation Mapping Program Coordinator
    Denver Federal Center, Building 810, Room 8000, MS 302
    Denver, Colorado 80225

    (303) 202-4220 (voice)
    303-202-4219 (FAX)
    gs-b-npsveg@usgs.gov

  2. What's the catalog number I need to order this data set?

    Orthorectified 3 band color raster image of Appomattox Courthouse National Historical Park.

  3. What legal disclaimers am I supposed to read?

    The U.S. Geological Survey and the National Park Service shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics (if available) are not legal documents and are not intended to be used as such.

    The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. Any related graphics (if available) are intended to aid the data user in acquiring relevant data; it is not approriate to use the related graphics as data.

    The U.S. Geological Survey and the National Park Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from an U.S. Geological Survey and National Park Service servers and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. Mention of trade names or commercial products in this metadata report does not constitute endorsement or recommendation for use by the U. S. Department of the Interior, U. S. Geological Survey and National Park Service.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 22-Jun-2001
Last Reviewed: 12-May-2010
Metadata author:
USGS/CSS/Core Science Analytics and Synthesis
c/o USGS-NPS Vegetation Mapping Program Coordinator
Denver Federal Center, Building 810, Room 8000, MS 302
Denver, Colorado 80225

(303) 202-4220 (voice)
303-202-4219 (FAX)
gs-b-npsveg@usgs.gov

Metadata standard:
FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata (FGDC-STD-001.1-1999)
Metadata extensions used:

Generated by mp version 2.9.12 on Wed May 12 09:03:17 2010
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