OLS : Record


Main Title Use of quality control procedures to assess errors in measuring forest canopy condition /
Author Cline, Steven P.; Burkman, W. G.; Geron, C. D.
CORP Author Corvallis Environmental Research Lab., OR. ;NSI Technology Services Corp., Corvallis, OR.
Publisher U.S. Environmental Protection Agency, Environmental Research Laboratory,
Place Published Corvallis, OR (200 SW 35th St., Corvallis 97333) :
Year Published 1989
Report Number EPA/600/D-89/105; ERL-COR-1050D
Stock Number PB90-113770
OCLC Number 45131789
Subjects Damage assessment; Pine trees; Forest trees; Air pollution; Maple trees; Measurement; Quality control; Field tests; Laboratories; Errors; Ratings; Acidification; Photographs; Mortality; Transparence; Acid precipitation; Forest Response Program; Tree canopy
Library   Call Number Additional Info Location Date Modified
NTIS PB90-113770 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
Collation 19 pages ; 28 cm
Abstract Quality control data collected during the measurement of ponderosa pine canopy cover and sugar maple crown damage was analyzed. Measurement precision (root mean square of differences in replicate measurements) of pine canopy cover was high (+or-2.6-4.0%) was similar for field replicates and laboratory replicates digitized with the same and different f-stops. In contrast, significant systematic errors can be introduced during certain analyses of hemispherical photographs. Measurement precision (frequency of remeasurement within +or- 1 class) of maple crown ratings was high (74-95%), due mainly to crew training prior to data collection. Precision was highest for branch dieback and foliage transparency and when remeasurements were done by the same crew. The following procedures are recommended: implement training prior to data collection, use consistent methods and reference materials to control measurement errors during data collection, and include methods and quality control data for a basis for evaluating data quality for comparability.
Notes "Paper presented at the 'Effetcs of Air Pollution on Western Forests' Symposium (82nd AWMA Annual Meeting in Anaheim, CA, June 29-30, 1989.). Includes bibliographical references. "EPA/600/D-89/105"--Cover. Microfiche.
Supplementary Notes Presented at the Effects of Air Pollution on Western Forests Symposium, Air and Waste Management Association Annual Meeting (82nd), Anaheim, CA., June 25-30, 1989. Prepared in cooperation with NSI Technology Services Corp., Corvallis, OR.
Author Added Ent
Burkman, William G.;
Geron, Chris D.
Corporate Au Added Ent United States. Environmental Protection Agency. ; Corvallis Environmental Research Laboratory. ; NSI Technology Services Corporation.
PUB Date Free Form {1989}
NTIS Prices PC A03/MF A01
BIB Level m
OCLC Time Stamp 20001006132428
Cataloging Source OCLC/T
Language eng
Origin OCLC
OCLC Rec Leader 01393nam 2200313Ka 45020