THE NATIONAL RESOURCES INVENTORY

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					 THE NATIONAL RESOURCES
       INVENTORY
               Wayne A. Fuller
         Sarah Nusser and Jeff Goebel

               Roles of Statistics
                       in
21st Century Monitoring and Assessment Systems

                   Denver
               September, 2004             1
The Natural Resources Inventory (NRI)
     A nationwide survey of non federal land
                 Conducted by
 Natural Resources Conservation Service (NRCS)
              Technical support by
             Iowa State University



                                            2
                Outline
History
1982-1997 National Resources Inventories
Estimation-imputed points
Annual Inventory




                                           3
                   History
Nusser and Goebel (EES, 1997)
1934 National Erosion Reconnaissanc
     Survey: Anecdotal (SCS)

1958 National Inventory of Soil and Water
     Conservation Needs (CNI): Stratified area
     sample of segments (40,160,640 acres)

1967 CNI: 38 Points within 160 Acre segments
     1958 Segments

                                                 4
          History (continued)
1977 National Resources Inventory: Subsample of
     1958 sample. Segment Acres for built up,
     farmsteads, water, streams. Three points per
     160 acre segment, 70,000 segments.

1982 National Resources Inventory: New sample in
     13 Northern states. 321,000 National, 44,000
     local segments. Three points per 160 acres.

1987 NRI: Subsample of 108,000 of 1982 sample.
                                                    5
         History (continued)
1992 NRI: 300,000 segments (some
     retrospective 1987 data).

1997 NRI: 300,000 segments. Three points
     per 160 acres.

2000-200? NRI: 70,000 segments per year, 40,000
     core every year. Subsamples of 1997 NRI.

                                                  6
           Data Collection
Photo – interpretation
     Segment acres of built-up, water
     Land coveruse of points
NRCS Field Offices
     Cropping practices
     Conservation Reserve Program (CRP)

                                          7
     Computer-Assisted Systems
• Large-scale client-server
  mobile data collection
  (1997)

• Integrated GPS functions
  in mobile computer (1999)

• Web-based survey
  services
   – Daily progress reports
     (1997)
   – On-line training (1998)
   – Data review system (2000)   8
              1982-1997 NRI
Longitudial survey. Almost same segments every
 year
External controls. Large Water, Federal
Combination of segment and point data
Complete easy-to-use databases



                                            9
      1992 – 1997 Estimation
         Sources of Data
Sample
      Segment
      Point
Auxiliary
      Large Water and Large Streams
      Federal and county area
      Administrative – CRP
      Hydrologic units (5000 HUCCOs)

                                       10
         Geospatial Data for a County
    County boundary
    4-digit HUA boundary

    Federal land in 92 & 97
    Federal land in 97 only
                                                   97
    Census water in 92 & 97       1
    PSU (Segment)                     3
                              2                    92, 97
1   HUCCO id




                                          92, 97
                                                        11
  Segment Sketch

       1

                   2


Road
           Urban          Urban

   3        97         82, 87, 92, 97




                                        12
Combining Segment and Point Data
  Table 1. Acres of segment coveruse by year.
                    Coveruse
            Urban       Roads      Total Acres
  1982        32          3             160
  1987        32          3             160
  1992        32          3             160
  1997        50          2             160
                                                 13
Table 2. Coveruse of real points.
                       Coveruse
           Point 1       Point 2    Point 3
1982       Pasture       Corn       Soybeans
1987       Pasture       Soybeans   Corn
1992       Pasture       Corn       Soybeans
1997       Pasture       Soybeans   Corn


                                               14
                Segment Data
          Urban      Roads             Total Acres
1982        32          3                 160
1987        32          3                 160
1992        32          3                 160
1997        50          2                 160




                      Point Data
            Point 1        Point 2    Point 3
   1982     Pasture        Corn       Soybeans
   1987     Pasture        Soybeans   Corn
   1992     Pasture        Corn       Soybeans
   1997     Pasture        Soybeans   Corn




                                                     15
Table 3. Coveruse and acres of imputed points representing
segment data.
                      Imputed Point
            No. 4        No. 5        No. 6        No. 7
1982        Urban      Soybeans       Roads       Roads
1987        Urban      Corn           Roads       Roads
1992        Urban      Soybeans       Roads       Roads
1997        Urban      Urban          Roads       Urban
Acres       32         17             2           1
                                                      16
                       Segment Data
           Urban           Roads            Total Acres
1982        32               3                 160
1987        32               3                 160
1992        32               3                 160
1997        50               2                 160

                 Point Data
       Point 1        Point 2    Point 3
1982   Pasture        Corn       Soybeans
1987   Pasture        Soybeans   Corn
1992   Pasture        Corn       Soybeans
1997   Pasture        Soybeans   Corn


                                                Imputed Points
                                        No. 4      No. 5       No. 6   No. 7
                             1982       Urban    Soybeans      Roads   Roads
                             1987       Urban    Corn          Roads   Roads
                             1992       Urban    Soybeans      Roads   Roads
                             1997       Urban    Urban         Roads   Urban
                             Acres       32         17           2       1
                                                                               17
                         Segment Data
            Urban            Roads                 Total Acres
1982         32                3                      160
1987         32                3                      160
1992         32                3                      160
1997         50                2                      160

                  Point Data
        Point 1        Point 2       Point 3
1982    Pasture        Corn          Soybeans
1987    Pasture        Soybeans      Corn
1992    Pasture        Corn          Soybeans
1997    Pasture        Soybeans      Corn
Acres     36             36            36

                                                        Imputed Points
                                                No. 4      No. 5       No. 6   No. 7
                                  1982          Urban    Soybeans      Roads   Roads
                                  1987          Urban    Corn          Roads   Roads
                                  1992          Urban    Soybeans      Roads   Roads
                                  1997          Urban    Urban         Roads   Urban
                                  Acres          32         17           2       1
                                                                                       18
Table 4. Coveruse and acres of real points.
                      Real Points
           Point 1       Point 2        Point 3
1982       Pasture       Corn           Soybeans
1987       Pasture       Soybeans       Corn
1992       Pasture       Corn           Soybeans
1997       Pasture       Soybeans       Corn
Acres      36            36             36
                                                   19
            Imputed Points
Probability of selecting donor coveruse
Imputed estimated total close to two-phase
  estimate Fuller (2003)




                                             20
              1997 Data Set
Set of points – ratio adjusted probability weights
Acres for HUCCOs match administrative
Estimates close to those of previous years




                                               21
       1982-1997 Gross-Change Table
            (Millions of Acres)
1982                            1997
                                      Other Water &
                  Cropland Developed NF land Federal    Total
Cropland           350.3      7.0        62.1     1.5    421.0
Developed            0.2     72.7         0.3     0.0     73.2
Other NF land       25.7     18.5       950.7     6.8   1001.7
Water & Federal      0.8      0.0         3.6   443.8    448.2
Total              377.0     98.3      1016.7   452.1   1944.1


                                                         22
             Annual NRI
Subsamples of 1997 NRI
Supplemented Panel Design

    Core Panel every year
    Rotate supplementary panels
    4-10 years to complete rotation

                                      23
               Annual NRI
  Year               Panel
Observed Core 2001 2002 2003 2004   Remainder
 1997     X    X    X      X  X        X
 2000     X
 2001     X    X
 2002     X         X
 2003     X                X
 2004     X                   X
                                          24
               Annual NRI
  Year               Panel
Observed Core 2001 2002 2003 2004   Remainder
 1997     X    X    X      X  X        X
 2000     X
 2001     X    X              X
 2002     X         X
 2003     X                X
 2004     X                   X
                                          25
    Generalized Least Squares
Vector of year-panel means is “y” vector
Vector of year means is “” vector
   y  Xβ  e       Eee  V

               
   ˆ  XV 1X 1 XV 1y
   β

   Breidt and Fuller (JABES, 1999)

                                           26
    Estimation for Annual NRI
Example: Impute 2000 for 2001 supplement
        Nearest Neighbor donor
               0.25Y1997, R  0.75Y2001, R
     Y2000                                Y2000, D
               0.25Y1997, D  0.75Y2001, D
Direct estimates of large change



                                                      27
              Reasons for Success
Demand for information
Adaptability and improvement
      (i) Cost structure
     (ii) Data: erosion, urban, CRP, wetlands
    (iii) Collection and processing techniques
    (iv) Auxiliary information-Geostatistical
People and institutions

                                                 28

				
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