The National Resources Inventory (NRI) is a scientifically-designed, longitudinal panel survey of the Nation's soil, water, and related resources designed to assess conditions and trends every five years. The NRI is conducted by the Natural Resources Conservation Service (NRCS), an agency of the U.S. Department of Agriculture (USDA), in cooperation with the Iowa State University (ISU) Statistical Laboratory. The 1997 NRI contains data on nonfederal lands and water areas within the 48 conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands. The 1997 NRI provides results that are nationally consistent for all nonfederal lands for four points in time - 1982, 1987, 1992, and 1997. The NRI is linked to U. S. Department of Agriculture's Soil Conservation Service's extensive Soil Interpretations Records database to provide additional soils information. Soil component and layer files may be linked to the NRI point table "NRIPTR" identifier.
This NRI tabular data set was compiled in order to simplify pesticide risk assesment and to provide a common data set upon which to perform analysis for all stakeholders.
This data set follows similiarly to the 1997 (revised December 2000) National Resources Inventory data set produced by the U.S. Department of Agriculture, Natural Resources Conservation Service. It does not contain all the attribute data tables in the original source NRI tabular data base issued by the NRCS. Rather, it is a portion thereof, consisting only of those tables most useful for performing pesticide risk assesments. To obtain the entire original source NRI tabular or spatial data sets, visit the following web site: http://www.nrcs.usda.gov/technical/NRI/.
ground condition
The NRI database is a statistical database. The data do not come in a summarized or aggregated form. Users of the database decide which portions of the data are needed, and how to aggregate and summarize the data most effectively. The data must be aggregated to develop meaningful statistics and analyses. To use the individual sample point data as other than a part of the statistical database is inappropriate; for example, it is a misuse to use the NRI database to attempt to identify a specific farm and field where certain conservation actions should be initiated. Tabulations made from the NRI database are estimates. These tabulations produce estimates rather than facts because they are based upon sample data derived from a survey - rather than data coming from a census, or complete measurement. Each estimate has some degree of statistical uncertainty associated with it; this statistical uncertainty affects analyses of the data and interpretation of results. All data summaries and analyses must take into account the database weights (expansion factors) and at least some type of geographical factors.
897-B Harrison Street, S.E.
1997 National Resources Inventory, produced by the U.S. Department of Agriculture, Natural Resources Conservation Service.
Less than 1% of the point table recordid values did not match a spatial representation of its FIPS/MLRA/HUC, but some blanks do exist. Likewise, some spatial NRI polygons exist that do not have tabular information. This discrepancy may be explained by different spatial data sets used by NRCS and GeoStac, as well as by actual changes in counties or MLRA codes and boundaries.
Extracted the original source 1992 NRI tabular SOILS5 data sets produced by the USDA NRCS, and compiled those tables of interest for use with pesticide risk assesment.
Added layer and component tables for the four regions for which the 1992 NRI distributed data, and then appended all the regions into national S5_Layer and S5_Comp tables. Added STATSGO lookup tables to define fields.
Created Metadata
Internal feature number.
ESRI
This NRI tabular data base consists of the following tables: 1) Point: Data that are not year-specific. This table serves as the "master table" relative to the relational structure. This master table includes two required variables for any data summary: the sample point weights or expansion factors (xfact) and a geographical factor (fips, hydro, or mlra). Almost all data tabulations and analyses will require data from this master table and one or more of the other tables, often the table trend. To link Point data to SOILS5, use the NRIPTR identifier with the comp and layer tables. The comp and layer tables use fields referenced in STATSGO, so their respective lookup tables are included in the database. This metadata document does not define each of the possible field types or the data variables for tables. To learn more about the field types or possible data variables, users should refer to the original source publication, "A GUIDE FOR USERS OF 1997 NRI DATA FILES," published in 1997 (revised December 2000) by the US Department of Agriculture, Natural Resources Conservation Service. SOILS5 information was provided with the 1992 NRI database.
U.S. Department of Agriculture. 2000. Summary Report: 1997 National Resources Inventory (revised December 2000), Natural Resources Conservation Service, Washington, DC, and Statistical Laboratory, Iowa State University, Ames, Iowa, 89 pages. http://www.nrcs.usda.gov/technical/NRI/
1500 Research Parkway, Suite B223
None
Data can be downloaded from www.geostac.org with a registered user ID and password provided by the Spatial Sciences Laboratory.
Not Applicable
897-B Harrison Street, S.E.