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    Author(s): Ralph J. Croxton
    Date: 1966
    Source: Res. Paper PSW-RP-35. Berkeley, CA: Pacific Southwest Forest & Range Experiment Station, Forest Service, U. S. Department of Agriculture; 13 p
    Publication Series: Research Paper (RP)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (3.3 MB)

    Description

    Aerial color photographs were taken at two scales over ash stands in New York State that were infected with ash dieback. Three photo interpreters then attempted to distinguish ash trees from other hardwoods and classify their disease condition. The scale of 1:7,920 was too small to permit accurate identification, but accuracy at the scale 1:1,584 was fair (60 to 70 percent) and disease classification was good (77 to 80 percent). Errors in identifying other species as ash were too numerous. Frequency of attack by ash dieback was positively correlated to increased diameter at breast height.

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    Citation

    Croxton, Ralph J. 1966. Detection and classification of ash dieback on large-scale color aerial photographs. Res. Paper PSW-RP-35. Berkeley, CA: Pacific Southwest Forest & Range Experiment Station, Forest Service, U. S. Department of Agriculture; 13 p

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