A manual for analysis of hemispherical canopy photography
- Stanford Univ., CA (USA). Dept. of Biological Sciences
Hemispherical canopy photography involves taking photographs through a hemispherical (fisheye) lens pointed upward from beneath a plant canopy. The resulting photographs can be analyzed to determine the geometry of canopy openings and to calculate potential light penetration. This manual serves as a comprehensive guide to the program CANOPY{copyright}, a public domain microcomputer program for image analysis of hemispherical canopy photography. Included are discussions of theory, research applications, field methodology, hardware setup and operation, and software setup and operation. CANOPY enables video digitization of negatives, real-time display of positive images, interactive determination of a threshold to distinguish foliage from canopy openings, editing of photographs with poor exposure, rapid calculation of various measures of canopy geometry and indices of potential light penetration, and convenient output of results. A series of utility programs allow user specification of theoretical or empirical distributions of direct sunlight and diffuse skylight for a given site. 78 refs., 11 figs., 8 tabs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- Sponsoring Organization:
- DOE/MA
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7064866
- Report Number(s):
- LA-11733-M; ON: DE90014718
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
09 BIOMASS FUELS
090700 -- Biomass Fuels-- Resources-- (1990-)
54 ENVIRONMENTAL SCIENCES
540210* -- Environment
Terrestrial-- Basic Studies-- (1990-)
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
AGRICULTURE
C CODES
CANOPIES
COMPUTER CODES
COMPUTER OUTPUT DEVICES
COMPUTER-GRAPHICS DEVICES
COMPUTERS
DIGITAL COMPUTERS
DISPLAY DEVICES
DOCUMENT TYPES
ENVIRONMENTAL EFFECTS
FORESTS
GROUND COVER
IMAGE PROCESSING
INDUSTRY
LEAVES
MANUALS
MEASURING METHODS
MICROCOMPUTERS
MONITORING
PERSONAL COMPUTERS
PHOTOGRAPHY
PLANTS
PROCESSING
RADIATIONS
S CODES
SOLAR RADIATION
STELLAR RADIATION
TREES
WOOD PRODUCTS INDUSTRY
090700 -- Biomass Fuels-- Resources-- (1990-)
54 ENVIRONMENTAL SCIENCES
540210* -- Environment
Terrestrial-- Basic Studies-- (1990-)
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
AGRICULTURE
C CODES
CANOPIES
COMPUTER CODES
COMPUTER OUTPUT DEVICES
COMPUTER-GRAPHICS DEVICES
COMPUTERS
DIGITAL COMPUTERS
DISPLAY DEVICES
DOCUMENT TYPES
ENVIRONMENTAL EFFECTS
FORESTS
GROUND COVER
IMAGE PROCESSING
INDUSTRY
LEAVES
MANUALS
MEASURING METHODS
MICROCOMPUTERS
MONITORING
PERSONAL COMPUTERS
PHOTOGRAPHY
PLANTS
PROCESSING
RADIATIONS
S CODES
SOLAR RADIATION
STELLAR RADIATION
TREES
WOOD PRODUCTS INDUSTRY