Land Surface Slope Sensitivity Rating for Wyoming

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: Land Surface Slope Sensitivity Rating for Wyoming

Abstract:

This dataset represents an aquifer sensitivity rating for land surface slope in the State of Wyoming. This dataset is specifically to be used within a DRASTIC-type aquifer sensitivity/vulnerability analysis. The dataset is in raster format, either 100 or 500 meter cell size.

For more details about this dataset, please refer to this report:

Hamerlinck, J.D. and Arneson, C.S., editors, 1998, Wyoming Ground-Water Vulnerability Assessment Handbook: Volume 1. Background, Model Development, and Aquifer Sensitivity Analysis: Spatial Data and Visualization Center Publication SDVC 98-01-1, University of Wyoming, Laramie, WY.

1. How should this data set be cited?

   Arneson, Christopher S. , 1998, Land Surface Slope Sensitivity Rating for Wyoming: UW Spatial Data and Visualization Center, Laramie, Wyoming.

   Online Links:

   • <URL:http://www.sdvc.uwyo.edu/clearinghouse/gw_vuln.html>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -111.26477012

   East_Bounding_Coordinate: -103.83670034

   North_Bounding_Coordinate: 44.99903411

   South_Bounding_Coordinate: 40.94837176

3. What does it look like?

   <URL:http://www.sdvc.uwyo.edu/images/slope_rt.gif> (gif)

   Slope Sensitivity Rating

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

   Calendar_Date: 1998

   Currentness_Reference: publication date

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

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

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

      The map projection used is Lambert Conformal Conic.

      Projection parameters:

      Standard_Parallel: 33

      Standard_Parallel: 45

      Longitude_of_Central_Meridian: -107.5

      Latitude_of_Projection_Origin: 41

      False_Easting: 0.00000

      False_Northing: 0.00000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1.0
      Ordinates (y-coordinates) are specified to the nearest 1.0
      Planar coordinates are specified in METERS

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS1980.
      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?

   Entity_and_Attribute_Overview: Values ranging from 1 to 10.

   Entity_and_Attribute_Detail_Citation: n/a

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Christopher S. Arneson

2. Who also contributed to the data set?

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

   SDVC Technical Coordinator
   Spatial Data and Visualization Center
   Box 4008 University Station
   Laramie, Wyoming 82071
   USA
   

   307-766-2532 (voice)
   n/a
   

   Hours_of_Service: 8:00 - 5:00 MST

This layer was developed specifically to aid in the creation of a Wyoming ground-water vulnerability to surface contamination study conducted at the Wyoming Water Resources Center. The DRASTIC-based model requires land surface slope as one of its parameters. This layer was specifically developed to aid in small-scale regional analysis within Wyoming.

1. From what previous works were the data drawn?

   dem (source 1 of 2)

   USGS, unknown, 3-arc-second (90m) Digital Elevation Model for Wyoming; <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/dem90m.html>.

   Type_of_Source_Media: digital

   Source_Scale_Denominator: 250000

   Source_Contribution: source of slope layer

   Slope (source 2 of 2)

   Arneson, C.S., 1998, Wyoming Land Surface Slope <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/slope.html>.

   Type_of_Source_Media: digital map

   Source_Scale_Denominator: 250000

   Source_Contribution: ratings are derived directly from Slope values

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

   Date: 1998 (process 1 of 1)

   Using the 100 and 500 meter resolution land Surface Slope datasets (Arneson, 1998; see link in Source Title above for related metadata) a series of rating equations were applied to make the datasets suitable for use in an additive-overlay type aquifer sensitivity model. The equations applied within ARC/INFO's GRID module were:

   Slope < 18 Rating = 5.5 + 4.5(0.19 * SIN(SLOPE + 7)) Slope >= 18 Rating = 10

   These rating equations defined by the Wyoming Water Resources Center produce a continuous curve similar to that outlined in EPA's DRASTIC manual (Aller et al. 1987). The curve begins at 1 and has a maximum value of 10. Calculations were done in ARC/INFO's GRID module at a 100 meter and 500 meter cell resolution.

   Citation

   Aller, L., Bennett, T., Lehr, J.J., Petty, R., and G. Hackett. 1987. DRASTC: A Standardized sytem for evaluating ground water pollution using hydrogeologic settings. U.S. Environmental Protection Agency. EPA/600/S2-87/035. Cincinati, OH.

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

1. How well have the observations been checked?

   See metadata for the source dataset, <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/dem90m.html>

2. How accurate are the geographic locations?

   See metadata for the source dataset, <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/dem90m.html>

3. How accurate are the heights or depths?

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

   All cells within the State of Wyoming are attributed.

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

   does not apply for raster data

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

Access_Constraints: none

Use_Constraints:

Updates to this dataset or the attached metadata may occur without notice, therefore this dataset may not be redistributed or repackaged in any form without the express written consent of the University of Wyoming Spatial Data and Visualization Center. Instead it is recommended that additional users download the most current version of the data from <http://www.sdvc.uwyo.edu/clearinghouse>.

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

   SDVC Technical coordinator
   UW Spatial Data and Visualization Center
   Box 4008 University Station
   Laramie, Wyoming 82071
   USA
   

   307-766-2532 (voice)
   n/a
   

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

3. What legal disclaimers am I supposed to read?

   The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate used described in this metadata document. The distributor makes no claims for the data's suitability for other purposes. It is strongly recommended that this data is directly acquired from the distributor described above and not indirectly through other sources which may have changed the data in some way.

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

     Data format:	ARCE (Arc/Info export) (version 7.0.4)
     Network links:	ftp.sdvc.uwyo.edu or <http://www.sdvc.uwyo.edu/clearinghouse>

   • Cost to order the data: No fees are required for downloading the data that is on-line.

Dates:

Last modified: Aug-1998

Metadata author:

Margo Berendsen
Box 4008 University Station
Laramie, Wyoming 82071
USA

307-766-2751 (voice)
meh@uwyo.edu

Metadata standard:

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