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

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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

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Outline

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

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History

• Nusser and Goebel (EES, 1997)
• National Erosion Reconnaissanc Survey
  Anecdotal (SCS)
• National Inventory of Soil and Water
  Conservation Needs (CNI) Stratified area
  sample of segments (40,160,640 acres)
• CNI 38 Points within 160 Acre segments 1958
  Segments

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History (continued)

• National Resources Inventory Subsample of
• 1958 sample. Segment Acres for built
  up,
• farmsteads, water, streams. Three
  points per
• 160 acre segment, 70,000 segments.
• National Resources Inventory New sample in
• 13 Northern states. 321,000 National,
  44,000
• local segments. Three points per 160
  acres.
• NRI Subsample of 108,000 of 1982 sample.

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History (continued)

• NRI 300,000 segments (some
• retrospective 1987 data).
• 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.

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Data Collection

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

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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

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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)

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Geospatial Data for a County
County boundary
4-digit HUA boundary
Federal land in 92 97
97
Federal land in 97 only
Census water in 92 97
1
PSU (Segment)
3
92, 97
2
1
HUCCO id
92, 97
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Segment Sketch
1
2
Road
Urban 82, 87, 92, 97
Urban 97
3
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Combining Segment and Point Data

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

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Table 3. Coveruse and acres of imputed points representing segment data. Table 3. Coveruse and acres of imputed points representing segment data. Table 3. Coveruse and acres of imputed points representing segment data. Table 3. Coveruse and acres of imputed points representing segment data. Table 3. Coveruse and acres of imputed points representing segment data. Table 3. Coveruse and acres of imputed points representing segment data.
Imputed Point Imputed Point Imputed Point Imputed Point Imputed Point 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

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Table 4. Coveruse and acres of real points. Table 4. Coveruse and acres of real points. Table 4. Coveruse and acres of real points. Table 4. Coveruse and acres of real points.
Real Points Real Points 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

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Imputed Points

• Probability of selecting donor coveruse
• Imputed estimated total close to two-phase
  estimate Fuller (2003)

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1997 Data Set

• Set of points ratio adjusted probability
  weights
• Acres for HUCCOs match administrative
• Estimates close to those of previous years

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1982-1997 Gross-Change Table(Millions of Acres)

1982 1997 1997 1997 1997 1997
Cropland Developed Other NF land Water 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
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Annual NRI

• Subsamples of 1997 NRI
• Supplemented Panel Design
• Core Panel every year
• Rotate supplementary panels
• 4-10 years to complete rotation

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Annual NRI
Year Panel Panel Panel Panel Panel 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
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Annual NRI
Year Panel Panel Panel Panel Panel 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
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Generalized Least Squares

• Vector of year-panel means is y vector
• Vector of year means is ? vector
• Breidt and Fuller (JABES, 1999)

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Estimation for Annual NRI

• Example Impute 2000 for 2001 supplement
• Nearest Neighbor donor
• Direct estimates of large change

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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