Hydrology

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?

   Inc, WorldView Solutions , October 2006, Hydrology.

   Online Links:

   • \\wvs1\Clients\Accomack\Current\Data\AccomackGIS_old.gdb

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -76.005373

   East_Bounding_Coordinate: -75.369934

   North_Bounding_Coordinate: 38.021734

   South_Bounding_Coordinate: 37.472484

3. What does it look like?

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

   Calendar_Date: March 2002

   Currentness_Reference: ground condition

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):

      • String (3105)

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

      The map projection used is Lambert Conformal Conic.

      Projection parameters:

      Standard_Parallel: 36.766667

      Standard_Parallel: 37.966667

      Longitude_of_Central_Meridian: -78.500000

      Latitude_of_Projection_Origin: 36.333333

      False_Easting: 11482916.666667

      False_Northing: 3280833.333333

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000095
      Ordinates (y-coordinates) are specified to the nearest 0.000095
      Planar coordinates are specified in survey feet

      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.
      

      Vertical_Coordinate_System_Definition:

      Altitude_System_Definition:

      Altitude_Resolution: 0.000003

      Altitude_Encoding_Method:

      Explicit elevation coordinate included with horizontal coordinates

7. How does the data set describe geographic features?

   Hydrology

   OBJECTID_1

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   Shape

   Feature geometry. (Source: ESRI)

   Coordinates defining the features.

   SHAPE_Length

   Length of feature in internal units. (Source: ESRI)

   Positive real numbers that are automatically generated.

   Shape_Length

   Length of feature in internal units. (Source: ESRI)

   Positive real numbers that are automatically generated.

   SHAPE

   Feature geometry. (Source: ESRI)

   Coordinates defining the features.

   LABEL

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • WorldView Solutions Inc

2. Who also contributed to the data set?

3. To whom should users address questions about the data?
   Tom Brockenbrough
   Accomack County Department of Planning
   GIS Coordinator
   23282 Courthouse Avenue
   Accomac, VA 23301
   USA
   

   757.787.5797 (voice)
   757.789.3116 (FAX)
   tbrockenbrough@co.accomack.va.us
   

   Hours_of_Service: 9am - 5pm, M-F

Why was the data set created?

Provide vector format depiction of streams and rivers.

How was the data set created?

1. From what previous works were the data drawn?

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

   Date: April 2002 (process 1 of 5)

   Acquired Virginia Base Mapping Project 2002 Aerial Photography from Accomack County.

   Person who carried out this activity:
   

   WorldView Solutions
   c/o Jamie Christensen
   Lead Project Coordinator
   101 South 15th Street - Suite 104
   Richmond, VA 23219
   

   804.915.7628 (voice)
   804.545.0792 (FAX)
   jamie@worldviewgis.com
   

   Hours_of_Service: 8-5, M-F

   Date: May 2002 (process 2 of 5)

   Digitized planimetric feature layer boundaries, using known features on 2002 VBMP Aerial Photos.

   Date: July 2002 (process 3 of 5)

   Cleaned and applied topology rules to digitzed planimetric features.

   Date: August 2002 (process 4 of 5)

   Where applicable, applied attributes categorizing and organizing planimetric features.

   (process 5 of 5)

   Dataset copied.

   Data sources used in this process:

   • \\WVS1\Clients\Accomack\Current\Data\Planimetrics.mdb

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 observations, including topology?

How can someone get a copy of the data set?

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

Access_Constraints:

Access is granted on a case-by-case basis by the Accomack County Department of Planning.

Use_Constraints:

Data is for planning purposes only - data should not be used without the express permission of the Accomack County Department of Planning.

1. Who distributes the data set? (Distributor 1 of 1)
   Accomack County Department of Planning
   c/o Tom Brockenbrough
   GIS Coordinator
   23282 Courthouse Avenue
   Accomac, VA 23301
   USA
   

   757.787.5797 (voice)
   757.789.3116 (FAX)
   tbrockenbrough@co.accomack.va.us
   

   Contact_Instructions:

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

   Downloadable Data

3. What legal disclaimers am I supposed to read?

4. How can I download or order the data?

Who wrote the metadata?

Dates:

Last modified: 04-Apr-2007

Metadata author:

Accomack County Department of Planning
c/o Tom Brockenbrough
GIS Coordinator
23282 Courthouse Avenue
Accomac, VA 23301
USA

757-787-5797 (voice)
757.789.3116 (FAX)
tbrockenbrough@co.accomack.va.us

Contact_Instructions:

tbrockenbrough@co.accomack.va.us Tom Brockenbrough

GIS Coordinator

Accomack County Department of Planning

P.O. Box 686

23282 Courthouse Avenue

Accomac, VA 23301

757.787.5797

fax

Metadata standard:

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

Metadata extensions used:

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