1991 Study Units - Final Data Aggregation

1994 Study Units - Summer 1998 Data Aggregation

Ancillary GIS data for 1991/94 NAWQA ground water sampling sites

This page contains various coverages and tables pertaining to ancillary data for ground water sampling sites in the NAWQA study units that began in 1991. As of October 1998, some of the ancillary data layers (excluding land use) also contain sites in study units that began in 1994.

• Ground water sampling sites (coverages)
• Ancillary data for sampling station buffers (500 meters and 1000 meters)
  • Land use (coverages || summary tables)
  • Population (summary tables)
  • Soils (summary tables)
  • Climate (summary tables)
  • Nutrients (summary tables)
• Ancillary data for sampling stations
  • Soils, terrain, hydrologic, climate, and land-cover characteristics data from Dave Wolock (summary tables)

COVERAGES

Ground water sampling sites

• Sites used for 1998-99 overlays

  This coverage was supplied by Curtis Price on October 6, 1998. This is a single coverage of ALL FY91 and FY94 sites (7,143 stations of all types) included in the netsite and site files as of that date. The INFO file called sites.net shows which stations are in each network.

  • Metadata - not available
  • Point data file (.5 MB file)

• Sites used for 1997-98 overlays

  We tried to get all of the ground water sampling sites by selecting stations from the national synthesis data base according to:

  • Station-type = ground water or spring (C802 = "SP" or C802 = "GW") or
  • Station is in a ground water network (SUCODE = "LUS" or "SUS" or "SPR" or "FPS" or "SPC")

  This resulted in a data set of 2992 ground water sampling locations.

  To analyze a particular network, select the group of appropriate station ids (STAIDs) for that network.

  The locations of the ground water sampling stations are available as "points" and as "regions" (buffers around the points).

  • Metadata
    • POINT - Html format|| Text format
    • REGION (500- and 1000-meter buffers around sites) - Html format|| Text format
  • Point data file (.1 MB file)
  • Region (buffers) data file (5 MB file)

Land use

The main theme of each coverage is land use updated with 1990 population data. The land use information is supplemented with look up tables that have land use codes within each well buffer, county codes within each well buffer, and county weighting factors. These coverages are the basis for the land use summary table listed under "Ancillary Data."

• Metadata - Html format|| Text format
• Data files (ARC format)
  • All study units: 500 meter buffers (60 MB tar file)|| 1000 meter buffers (61 MB tar file)
  • CNBR only: 500 meter buffers (1.6 MB tar file)|| 1000 meter buffers (1.6 MB tar file)

ANCILLARY DATA FOR SAMPLING STATION BUFFERS (500 meters and 1000 meters)

Land use *

The summary table of land use within well buffers was prepared using the coverages available above.

• Metadata - Html format|| Text format
• Data files
  • INFO files: 500 meter buffer (1.8 MB)|| 1000 meter buffer (1.8 MB)
  • RDB files: 500 meter buffer (.8 MB)|| 1000 meter buffer (.8 MB)

* I had to process the land use and population data by study unit because the coverages containing land use updated by population are organized by study unit. (That is, there is no national coverage of land use and population.)

Population *

• Metadata - Html format|| Text format
• Data files
  • INFO files: 500 meter buffer (.4 MB)|| 1000 meter buffer (.4 MB)
  • RDB files: 500 meter buffer (.2 MB)|| 1000 meter buffer (.2 MB)

* I had to process the land use and population data by study unit because the coverages containing land use updated by population are organized by study unit. (That is, there is no national coverage of land use and population.)

Soils

• Hydrologic group
  • Metadata - Html format|| Text format
  • Data files
    • INFO files: 500 meter buffer (1.4 MB)|| 1000 meter buffer (1.4 MB)
    • RDB files: 500 meter buffer (.8 MB)|| 1000 meter buffer (.8 MB)

• Slope, water table depth, depth to bedrock, permeability, available water capacity, bulk density, organic matter content, soil erodibility group, soil loss tolerance factor, wind erodibility group, and soil texture
  • Metadata - Html format|| Text format
  • Data files
    • INFO files: 500 meter buffer (4.1 MB)|| 1000 meter buffer (4.1 MB)
    • RDB files: 500 meter buffer (1.7 MB)|| 1000 meter buffer (1.7 MB)

Climate

• Temperature and precipitation (1951-80)
  • Metadata - Html format|| Text format
  • Data files
    • INFO files: 500 meter buffer (.5 MB)|| 1000 meter buffer (.5 MB)
    • RDB files: 500 meter buffer (.3 MB)|| 1000 meter buffer (.3 MB)

Nutrients

• Fertilizer, manure, and atmospheric deposition nitrogen loading apportioned by land use within 500 meter buffer around sampling location
  • Metadata - Html format|| Text format
  • Data files
    • RDB file containing fertilizer and manure data (.1 MB)
    • RDB file containing atmospheric deposition data (.5 MB)
• Residual Nitrogen from Fertilizer and Manure (1990-93)
  
  • Metadata - Html format|| Text format
  • Data file - not to be distributed. See metadata.

ANCILLARY DATA FOR SAMPLING STATIONS

• Soils, terrain, hydrologic, climate, and land-cover characteristics data from Dave Wolock
  • Metadata - No formal metadata available. See text file. Data is for all FY91/FY94 NAWQA sites.
  • Data files
    • INFO file (3.4 MB)
    • RDB file (1.7 MB)