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    Author(s): James A. WestfallMichael Hoppus
    Date: 2005
    Source: In: McRoberts, Ronald E.; Reams, Gregory A.; Van Deusen, Paul C.; McWilliams, William H.; Cieszewski, Chris J., eds. Proceedings of the fourth annual forest inventory and analysis symposium; Gen. Tech. Rep. NC-252. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Research Station. 193-197
    Publication Series: General Technical Report (GTR)
    Station: North Central Research Station
    PDF: View PDF  (476.19 KB)

    Description

    In the Northeast region, the USDA Forest Service Forest Inventory and Analysis (FIA) program utilizes stratified sampling techniques to improve the precision of population estimates. Recently, interpretation of aerial photographs was replaced with classified remotely sensed imagery to determine stratum weights and plot stratum assignments. However, stratum weights based on remotely sensed data depend on many factors, such as classification algorithm and image selection. County volume estimates and associated variances were calculated over a range of stratum weight scenarios and for various number of strata. Rates of change in estimated values and variances, and their effects on percent sampling error, were examined in relation to different strata configurations.

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    Citation

    Westfall, James A.; Hoppus, Michael. 2005. Sensitivity of FIA Volume Estimates to Changes in Stratum Weights and Number of Strata. In: McRoberts, Ronald E.; Reams, Gregory A.; Van Deusen, Paul C.; McWilliams, William H.; Cieszewski, Chris J., eds. Proceedings of the fourth annual forest inventory and analysis symposium; Gen. Tech. Rep. NC-252. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Research Station. 193-197

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