[ Introduction Mapsheets Region All of BC or Pests Questions ]
This web site contains the Forest Health Network aerial detection survey coverages for British Columbia. These "pest" coverages are stored as an ArcInfo coverage format and are converted to an ArcInfo export file (.e00) format for FTP purposes. The coverages can be selected in three different ways: by mapsheet, by region, or for the whole of BC.
Select a method for retrieval: There a four different ways of finding the desired pest type and year. The methods are by Mapsheet, Region, All of BC, and by pest.
Aerial detection surveys are conducted to detect and monitor
annual, visible vegetation damage primarily caused by insects. Aerial
detection surveys are intended to detect new activity, to monitor the
trend of ongoing activity, to provide general location information, and
to subjectively rate levels of defoliation. Manually mapping such activity
has quantitative and locator accuracy limitations and does not maintain
the accuracy standards as most data found in GIS databases.
Briefly, aerial detection pest surveys are generally carried out
from fixed wing aircraft where observers manually sketch each infestation
site onto 1:100000 or 1:250000 scale basemaps. The observers sketch infestation
sites by drawing polygons around the outer perimeter of the infested area
on the map. Ground checks and other sampling methods are carried out to
evaluate the subjective ratings. Often very small polygons are represented
by a single point. Then using visual observations, the observer subjectively,
based on many years of past experience, records the defoliation severity
or mortality of each polygon. Sketch maps are then digitized using Arc
Info.
[description file] [sample map] [top]
[description file] [sample
map] [top]
[description file] [sample map] [top]
Pests:
Two-year spruce budworm
Western balsam bark beetle
Western Blackheaded budworm
Douglas-fir beetle
Douglas-fir tussock moth
False hemlock looper
Forest tent caterpillar
Hemlock sawfly
Large aspen Tortrix
Mountain pine beetle
Northern tent caterpillar
Spruce beetle
Spruce budworm (Eastern)
Western hemlock looper
Western spruce budworm
[description file] [sample map] [top]
Pacific Forestry Centre
506 West Burnside Avenue
Victoria British Columbia
Canada V8Z 1M5
Phone: (250) 363-0600
Fax: (250) 363-6006