Ranch Orthorectified Photomosaic FAQ Metadata

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Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How should this data set be cited?

   USDA-FSA Aerial Photography Field Office, 20051223, lyjo_ranch_2005_clip.tif: USDA FSA Aerial Photography Field Office, Salt Lake City, Utah.

   Online Links:

   • <http://biology.usgs.gov/npsveg/ftp/vegmapping/lyjo/lyjoortho.zip>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -99.317134

   East_Bounding_Coordinate: -98.557295

   North_Bounding_Coordinate: 30.566041

   South_Bounding_Coordinate: 30.121458

   Description_of_Geographic_Extent: Lyndon B. Johnson National Historical Park

3. What does it look like?

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

   Calendar_Date: 2005

   Currentness_Reference: Majority years of Photography Dates.

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: Gillespie, TX

      This is a Raster data set. It contains the following raster data types:
      • Dimensions 5501 x 7501 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: 14

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996

      Longitude_of_Central_Meridian: -99.0

      Latitude_of_Projection_Origin: 0.0

      False_Easting: 500000

      False_Northing: 0.0

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 1.000000
      Ordinates (y-coordinates) are specified to the nearest 1.000000
      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.
      The flattening of the ellipsoid used is 1/298.257.
      

7. How does the data set describe geographic features?

   Band_1

   Raster (Source: ESRI)

   ObjectID

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   Value

   Internal feature number. (Source: ESRI)

   None.

   Count

   Internal feature number. (Source: ESRI)

   None.

   Band_2

   Raster (Source: ESRI)

   ObjectID

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   Value

   Internal feature number. (Source: ESRI)

   None.

   Count

   Internal feature number. (Source: ESRI)

   None.

   Band_3

   Raster (Source: ESRI)

   ObjectID

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   Value

   Internal feature number. (Source: ESRI)

   None.

   Count

   Internal feature number. (Source: ESRI)

   None.

   Entity_and_Attribute_Overview:

   24-bit pixels, 3 band color (RGB) represent brightness values 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)
   • USDA-FSA Aerial Photography Field Office

2. Who also contributed to the data set?

3. To whom should users address questions about the data?
   USDA-FSA Aerial Photography Field Office
   2222 West 2300 South
   Salt Lake City, Utah 84119-2020
   USA
   

   800-973-3500 (voice)
   801-975-3529 (FAX)
   

Why was the data set created?

Imagery is used to meet USDA program requirements including conservation planning and soil survey. The interim product is a compressed mosaic. Users should be aware that the interim compressed mosaic may contain defects and have horizontal accuracy less than the specified tolerances.

How was the data set created?

1. From what previous works were the data drawn?

   MrSID compressed image (source 1 of 1)

   Aerial Photography Field Office, 20051223, Gillespie, TX.

   Type_of_Source_Media: CD

   Source_Scale_Denominator: 40000

   Source_Contribution: Mosaicked County Image

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

   Date: 23-Dec-2005 (process 1 of 2)

   Imagery was flown with Leica ADS40 digital sensors to capture 0.9m raw data. Raw data is then downloaded using Leica GPro software into 12 bit TIFF format. The raw TIFF imagery is then georeferenced and reprojected using GPS/INS 200Hz exterior orientation information (x/y/z/o/p/k) to allow stereo viewable imagery. This stereo viewable imagery is processed with the GPro/LPS automatic point matching algorithm to determine common match points every 2000 pixels across the imagery strip and 333 pixels along strip. This pattern includes dual rows of line ties to the adjacent line of imagery. The resulting point data is imported in Leica ORIMA and used to perform a full bundle adjustment of the imagery point data. Any blunders are removed, and weak areas are manually supplemented to ensure good coverage of points. Once the point data is cleaned and point coverage is acceptable vertical control points from the prior generation MDOQQ's are introduced in the corners and center of the block being adjusted. This control is used to perform any datum shift (x/y/z and rotation) to ensure the new adjusted imagery fits the existing MDOQQ reference imagery. The output from this bundle adjustment process is revised exterior orientation data for the sensor with any GPS/INS, datum, and sensor calibration errors modeled and compensated for. Using this revised EO data orthorectified image strips are created using the USGS DEM. The 10m DEM is used where available and 30m DEM is used elsewhere. The orthorectified strips are overlaid over the existing MDOQQ compressed files to ensure accuracy is met by a visual inspection and manually measuring features. Once the accuracy of the orthorectified image strips are validated the strips are processed with a NWG proprietary dodging package that compensates for the bi-directional reflectance function that is caused by the sun's position relative to the image area. This compensated imagery is then imported into Inpho's OrthoVista 4.0 package which is used for the final radiometric balance, mosaic, and DOQQ sheet creation. These final DOQQ sheets contain a 300m minimum buffer. These final DOQQ tiles are edge inspected to the existing MDOQQ sheets for accuracy validation. The final DOQQ tiles are then organized into directories based on the USDA provided county lists. A visual inspection is performed of the entire county to ensure all tiles are present and the radiometric quality of the county looks good. If the radiometric quality is acceptable the county is compressed to MG3 format using Lizard Tech's GeoExpress v5.0 with a compression factor of 15 and 9 overview levels. Once this compression is complete manual reviewing is performed to ensure satisfactory results. The associated CCM shapefile is created using ESRI ArcView 9.0 with the latest service packs.

   Date: Unknown (process 2 of 2)

   Metadata imported.

   Data sources used in this process:

   • C:\Projects\nps\LYJO\NAIP\2005\imagery\compliance_fsa\naip_1-1_2n_s_tx171_2005_1.sid.xml

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?

   FSA Digital Orthophoto Specs.

3. How accurate are the heights or depths?

   N/A 2d only

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

   None

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, The Originator asks to be credited in derived products.

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?

   Downloadable Data

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?
   • Availability in digital form:

     Data format:	HTML
     Network links:	<http://biology.usgs.gov/npsveg/lyjo/index.html>

   • Cost to order the data: None

   • Availability in digital form:

     Data format:	Natural Color in format Compressed County Mosaic Size: 0.000
     Network links:	None
     Media you can order:	CD (format ISO 9660)

   • Cost to order the data: Contact the Aerial Photography Field Office for more information

Who wrote the metadata?

Dates:

Last modified: 25-Jan-2007
Last Reviewed: 02-Jun-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:

• <http://www.nbii.gov/portal/server.pt/community/fgdc_metadata/255>