NAWQA GIS ancillary data: Enhanced National Land Cover Data 1992 (NLCDe 92) for 500-m buffers around ground water sampling sites

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Metadata:

Identification_Information:

Citation:
Citation_Information:
Originator: Hitt, Kerie J.
Publication_Date: 20080612
Title:
NAWQA GIS ancillary data: Enhanced National Land Cover Data 1992 (NLCDe 92) for 500-m buffers around ground water sampling sites
Online_Linkage: <http://water.usgs.gov/nawqa-only/gw.html>

Description:
Abstract:

This data set consists of NLCDe 92 land use percentages for 500-meter buffers around NAWQA ground water sampling sites. The land use data is from the 30-m NLCDe 92. The sampling sites are from the NAWQA data warehouse.
Purpose:

This is one of the ancillary GIS data layers developed to characterize NAWQA sampling sites for national synthesis of water-quality data.
Supplemental_Information:

The NLCDe 92 input data set did not include Alaska and Hawaii, so sites in Cook and Oahu have "no data." Some sites in Puget Sound fall in Canada and do not have NLCDe 92 data.
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 1991
Single_Date/Time:
Calendar_Date: 2001

Currentness_Reference:
The data set is intended to represent conditions for the early 1990's to late 1990's.
Status:
Progress: Complete
Maintenance_and_Update_Frequency:
NAWQA sampling sites are added as their locations become available.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -125
East_Bounding_Coordinate: -66
North_Bounding_Coordinate: 50
South_Bounding_Coordinate: 24

Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Ground water
Theme_Keyword: Land use
Theme_Keyword: Land cover
Theme_Keyword: NLCD
Theme_Keyword: NLCDe 92
Theme_Keyword: MRLC
Theme_Keyword: National land cover data
Theme_Keyword: Water quality

Access_Constraints: The data set is for internal USGS access only.

Use_Constraints: The data set is for internal USGS use only.

Data_Quality_Information:

Logical_Consistency_Report: none
Completeness_Report: none

Lineage:

Source_Information:
Source_Citation:
Citation_Information:
Originator: Naomi Nakagaki
Originator: Curtis V. Price
Originator: James A. Falcone
Originator: Kerie J. Hitt
Originator: Barbara C. Ruddy
Publication_Date: 200711
Title: Enhanced National Land Cover Data 1992 (NLCDe 92)
Edition: 2005
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Sacramento, CA
Publisher: U.S. Geological Survey
Online_Linkage: <http://water.usgs.gov/lookup/getspatial?nlcde92>
Type_of_Source_Media: digital files
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1986
Ending_Date: 1995
Source_Currentness_Reference: Publication date
Source_Citation_Abbreviation: NLCDe 92
Source_Contribution:

This source provided land cover representative of the 1990s. NLCDe 92 is the nationally-consistent source of mapped land cover used by the USGS National Water-Quality Assessment Program to analyze data collected during the first decade of sampling from 1991-2001. This 30-meter resolution digital data set was developed by overlaying USGS's original satellite imagery-based 1992 National Land Cover Data ("NLCD 92") with selected classifications from USGS's aerial-photograph-based Land Use and Land Cover (LULC) data of the 1970s to mid-1980s. The LULC data were combined with NLCD 92 because the LULC data are accepted as a better source of information for certain land cover types that are difficult to interpret from satellite imagery alone.
NLCDe 92 has a 25-category land-cover classification scheme and is available as 30-meter resolution raster data. The land cover was clipped to the conterminous United States boundary and medium resolution shoreline. 
NLCDe 92 LANDCOVER CODES AND DESCRIPTIONS
-----------------------------------------------
11   Open Water
12   Perennial Ice/Snow
21   Low Intensity Residential
22   High Intensity Residential
23   Commercial/Industrial/Transportation
25   LULC Residential
26   NLCD/LULC Forested Residential
31   Bare Rock/Sand/Clay
32   Quarries/Strip Mines/Gravel Pits
33   Transitional
41   Deciduous Forest
42   Evergreen Forest
43   Mixed Forest
51   Shrubland
61   Orchards/Vineyards/Other
62   LULC Orchards/Vineyards/Other
71   Grasslands/Herbaceous
72   LULC Tundra
81   Pasture/Hay
82   Row Crops
83   Small Grains
84   Fallow
85   Urban/Recreational Grasses
91   Woody Wetlands
92   Emergent Herbaceous Wetlands
99   Missing Data *
* added classification to fill in null data values
Source_Information:
Source_Citation:
Citation_Information:
Originator: Jo Ann Gronberg
Publication_Date: 20050907
Title:
GRID CO1990G -- 30-meter resolution grid of 1990 county boundaries
Type_of_Source_Media: digital files
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2005
Source_Currentness_Reference: Publication date of county boundary data
Source_Citation_Abbreviation: CO1990g
Source_Contribution:
30-m grid of county boundaries with FIPS codes, generated from 100K county polygon coverage (COUNTY100) with medium resolution shoreline from NOAA used for clipping NLCDe 92.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Curtis Price
Originator: Jessica Thompson
Publication_Date: 20080429
Title: NAWQA sampling points (NAWQAPT)
Edition: April 2008
Geospatial_Data_Presentation_Form: vector digital data
Type_of_Source_Media: digital files
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20080429
Source_Currentness_Reference: current
Source_Citation_Abbreviation: NAWQAPT
Source_Contribution:
The location of all of the NAWQA sampling sites as of publication date.
Process_Step:
Process_Date: 200805
Process_Description:

The basic procedure was to create a 500-m radius circular buffer of NLCDe 92 land use around each NAWQA sampling site, then calculate what fraction of the total buffer is represented by each land use category within the buffer. Data processing occurs at 30 meters resolution.
The grid representing the 500-m buffer of land use around the site was created using GRID SELECTCIRCLE. The location of each site in NAWQAPT (xcoord and ycoord) forms the center of the buffer.
The land use fraction for each land use category (AREAF) is computed as the area of each land use in the buffer divided by the total area of the buffer. The land use percentage is AREAF * 100.
The NLCDe 92 by buffer was derived from the county/NLCDe 92 land use weight table (GWBUF_FIPSLU.AWT) by summing the area fractions (AREAF) by unique occurrences of Station id (AREAID) and land use (NLCDe 92). 
FREQUENCY GWBUF_FIPSLU.AWT GWBUF_NLCDE1
Frequency items: AREAID, NLCDE
Summary items: AREAF, AREAKM2
Processing routines are from the NAWQA area characterization toolbox.
Process_Step:
Process_Date: 200805
Process_Description:
Grouped the above results (multiple records for each AREAID) by AREAID. 
GROUP2ROW GWBUF_NLCDE1 GWBUF_NLCDE AREAID NLCDE LUPCT
NLCDe 92 numbers were multiplied by 100 and AREAF was multiplied by 100 and the name was changed to LUPCT (land use percent).
The file structure now is one record for each STAID.
Process_Step:
Process_Date: 20080612
Process_Description:

Processed NLCDe 92 using sites selected from NAWQAPT version 4/29/08. Instead of using all of the sites in NAWQAPT, only ground water (GW) sites were processed. The GW sites were selected using the GW network table and site TYPE as follows:
First obtain all of the sites in the GW networks contained in the GW network table (nawqapt.gwnetc): 
reselect nawqapt.net info keyfile nawqapt.gwnetc info sucode
reselect nawqapt points keyfile nawqapt.net info staid
Then go back to get any points not selected that are coded as Ground Water TYPE: 
asel nawqapt points TYPE = 'GW'
This resulted in 9051 sites.
Two sites needed for the Nutrients Circular were obtained from the Nutrients master data set: 
STAID 335914102430001
STAID 472522117054901
Of these 9053 sites, 93 fall in locations outside of the extent of NLCDe 92 in OAHU, COOK, and Canada (PUGT). Therefore these sites have no NLCDe 92 data. NLCDe 92 data now covers 8960 sites.
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:

The data set is referenced by AREAID, the station id of the NAWQA sampling site.
Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

The data set is organized by AREAID (station id).
The fields are: 
AREAID     NAWQA station id
NLCDE_11   Percent of 500-m buffer comprised of open water
NLCDE_12   Percent of 500-m buffer comprised of perennial ice/snow
NLCDE_21   Percent of 500-m buffer comprised of low-intensity residential
NLCDE_22   Percent of 500-m buffer comprised of high-intensity residential
NLCDE_23   Percent of 500-m buffer comprised of commercial/industrial/transportation
NLCDE_25   Percent of 500-m buffer comprised of LULC residential
NLCDE_26   Percent of 500-m buffer comprised of NLCD/LULC forested residential
NLCDE_31   Percent of 500-m buffer comprised of bare rock/sand/clay
NLCDE_32   Percent of 500-m buffer comprised of quarries/strip mines/gravel pits
NLCDE_33   Percent of 500-m buffer comprised of transitional
NLCDE_41   Percent of 500-m buffer comprised of deciduous forest
NLCDE_42   Percent of 500-m buffer comprised of evergreen forest
NLCDE_43   Percent of 500-m buffer comprised of mixed forest
NLCDE_51   Percent of 500-m buffer comprised of shrubland
NLCDE_61   Percent of 500-m buffer comprised of orchards/vineyards/other
NLCDE_62   Percent of 500-m buffer comprised of LULC orchards/vineyards/other
NLCDE_71   Percent of 500-m buffer comprised of grasslands/herbaceous
NLCDE_72   Percent of 500-m buffer comprised of LULC tundra
NLCDE_81   Percent of 500-m buffer comprised of pasture/hay
NLCDE_82   Percent of 500-m buffer comprised of row crops
NLCDE_83   Percent of 500-m buffer comprised of small grains
NLCDE_84   Percent of 500-m buffer comprised of fallow
NLCDE_85   Percent of 500-m buffer comprised of urban/recreational grasses
NLCDE_91   Percent of 500-m buffer comprised of woody wetlands
NLCDE_92   Percent of 500-m buffer comprised of emergent herbaceous wetlands
NLCDE_99   Percent of 500-m buffer comprised of "no land cover data"
SUM_LUPCT  Sum of the percents of all the land use categories (approx. 100)
Entity_and_Attribute_Detail_Citation: None

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Kerie Hitt
Contact_Organization: USGS NAWQA Nutrients National Synthesis
Contact_Address:
Address_Type: Mailing address
Address: 413 National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Electronic_Mail_Address: kjhitt@usgs.gov
Contact_Voice_Telephone: 703 648-6854
Contact_Instructions: Contact via email
Distribution_Liability:
USGS assumes no liability for the use of this data set.
Metadata_Reference_Information:
Metadata_Date: 20080612
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Kerie Hitt
Contact_Organization: USGS NAWQA Nutrients National Synthesis
Contact_Address:
Address_Type: Mailing address
Address: 413 National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Electronic_Mail_Address: kjhitt@usgs.gov
Contact_Voice_Telephone: 703 648-6854
Contact_Instructions: Contact via email
Metadata_Standard_Name: Content standards for digital geospatial metadata
Metadata_Standard_Version: FGDC-STD-001-1998


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