Tile Extent shapefile

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?

Title: Tile extent

Abstract:

Represents the extent of a specific 2x2km tile that has usable LIDAR data.

Supplemental_Information:

See the source lidar GeoTIFF tile for more specific accuracy information.

1. How should this data set be cited?

   National Park Service South Florida/Caribbean Network Inventory and Monitoring Program, Spring 2006, tile extent

    

2. What geographic area does the data set cover?

   Dry Tortugas National Park

3. What does it look like?

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

   Calendar_Date: 22-Mar-2006

   Currentness_Reference: publication date

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

   Geospatial_Data_Presentation_Form: vector digital data

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

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • G-polygon (1616)

   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 coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000001
      Ordinates (y-coordinates) are specified to the nearest 0.000001
      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?

   extent_e298n2722

   FID

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   Shape

   Feature geometry. (Source: ESRI)

   Coordinates defining the features.

   ID

   Unique ID. (Source: NPS)

   GRIDCODE

   Elevation Value. (Source: NPS)

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • National Park Service South Florida/Caribbean Network Inventory and Monitoring Program

2. Who also contributed to the data set?

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

   National Park Service South Florida / Caribbean Network
   c/o Judd Patterson
   Research Assistant
   18001 Old Cutler Road, Suite 419
   Palmetto Bay, Florida 33157
   United States
   

   (305) 252-0347 (voice)
   (305) 253-0463 (FAX)
   

This shapefile was generated as an intermediate step while creating a series of USGS LIDAR maps. Its polygons represent specific regions of a 2x2km tile that have usable LIDAR data. All areas not covered by polygons correspond to areas of No Data on the LIDAR tile. This shapefile is particularly useful as an analysis mask within Spatial Analyst.

1. From what previous works were the data drawn?

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

   Date: February 2006 (process 1 of 3)

   The floating-point LIDAR data needs to be converted to an integer raster. This is done with the Int() command within the Raster Calculator.

   Person who carried out this activity:
   

   National Park Service South Florida / Caribbean Network
   c/o Judd Patterson
   Research Assistant
   18001 Old Cutler Road, Suite 419
   Palmetto Bay, Florida 33157
   United States
   

   (305) 252-0347 (voice)
   (305) 253-0463 (FAX)
   

   Date: February 2006 (process 2 of 3)

   Then the Raster to Feature command is used to convert the data into a vector shapefile.

   Date: February 2006 (process 3 of 3)

   An attribute query is run to locate polygons with a GRIDCODE value of -100. An edit session is started on the shapefile, the queried polygons are removed using the delete key, edits are saved, and the edit session is ended.

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

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?

   This layer is complete.

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

   This layer was generated from an existing lidar tile.

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)

   National Park Service South Florida / Caribbean Network
   18001 Old Cutler Road; Suite 419
   Miami, Florida 33157
   United States
   

   (305) 252-0347 (voice)
   (305) 253-0463 (FAX)
   

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

   Dry Tortugas National Park Digital Map Atlas DVD

3. What legal disclaimers am I supposed to read?

   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 are not legal documents and are not intended to be used as such.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	SHP (version March 2006) Shapefile Size: 0.511
     Media you can order:	DVD (format Standard DVD)

   • Cost to order the data: 0

   • Special instructions:

     Contact NPS for details.

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

   Call NPS for details.

Dates:

Last modified: 24-May-2006

Metadata author:

National Park Service South Florida / Caribbean Network
c/o Judd Patterson
Research Assistant
18001 Old Cutler Road; Suite 419
Miami, Florida 33157
United States

(305) 252-0347 (voice)
(305) 253-0463 (FAX)

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:

• <http://www.esri.com/metadata/esriprof80.html>