Hemlock Distribution Maps
- HF-ID: R2003-01
- Category: Research Files
- Creator: Orwig, D.A., Foster, D.R.
- Associated Person: Hall, J.
- Date: 1990-1993
- Location: Central Massachusetts
- Media: Paper
- Contents:
- 24 topo maps with hand drawn hemlock cover delineation [aerial photographs used in delineation were returned to UMass]. 24 maps.
- Keywords: hemlock, hemlock woolly adelgid
- Abstract:
- Using aerial photographs, we documented hemlock distribution throughout central Massachusetts and subsampled 123 stands to examine the spatial pattern of HWA and its impact on tree vigor and mortality since its arrival in 1989.
- To produce a map of hemlock distribution contemporaneous with the arrival of HWA in 1989, we manually interpreted color infrared (CIR) photographic overlays (1:40,000) taken on several dates in March or April of 1990–1993. All stands greater than 1.3 ha and estimated to contain at least 10% hemlock cover were delineated onto acetate overlays, transferred to USGS 7.5 minute topographic maps with the aid of a zoom transfer scope, and digitized into a GIS. The abundance of hemlock in each polygon was assigned to two broad cover classes: 10–50% hemlock and greater than 50% hemlock.
- Topographic map quadrangles:
- Athol, Barre, Belchertown, Bernardston, Easthampton, Greenfield, Hampden, Ludlow, Monson, Mt Holyoke, Mt Tom, North Brookfield, Northfield, Orange, Palmer, Shutesbury, Southbridge, Springfield North, Springfield South, Warren, West Springfield, Williamsburg, Winchendon, Winsor Dam
- Aerial photographs used (returned to UMass):
- 2033-127, 2033-129, 2033-131, 2033-133, 2033-135, 2033-137, 2033-139, 2033-141, 2033-144, 2033-146, 2033-148, 2033-150, 2033-152, 2033-26, 2033-28, 2033-30, 2033-32, 2033-34, 2033-36, 2033-38, 2033-40, 2033-42, 2033-44, 2033-46, 2033-48, 2033-53, 2033-55, 2033-57, 2033-59, 2033-61, 2033-63, 2033-65, 2033-67, 2033-69, 2033-71, 2033-73, 2036-127, 2036-129, 2036-131, 2036-133, 2036-135, 2036-137, 2036-139, 2036-141, 2036-143, 2036-145, 2036-147, 2036-152, 2036-154, 2036-156, 2036-158, 2036-160, 2036-162, 2036-164, 2036-166, 2036-168, 2036-170, 2036-172, 2036-53, 2036-55, 2036-57, 2036-59, 2036-61, 2036-63, 2036-65, 2036-67, 2036-69, 2036-71, 2036-73, 2036-75, 2039-11, 2039-13, 2039-15, 2039-17, 2039-19, 2039-21, 2039-23, 2039-3, 2039-5, 2039-7, 2039-74, 2039-76, 2039-78, 2039-80, 2039-82, 2039-84, 2039-86, 2039-88, 2039-9, 2039-90, 2039-92, 2039-94, 2041-111, 2041-113, 2041-115, 2041-117, 2041-119, 2041-121, 2041-123, 2041-125, 2041-127, 2042-39, 2042-41, 2042-43, 2042-45, 2042-47, 2042-49, 2042-50, 2043-25, 2043-27, 2043-29, 2045-25, 2045-26, 2045-28
- Related Items:
- Archives Location: Map Room, stack 5, drawer 16
- Access: Active