imagery for forest r&d general requirements –sub-crown spatial resolution –fine spectral...
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Imagery for Forest R&D
• General requirements– Sub-crown spatial resolution– Fine spectral resolution (~10nm FWHM)– Season– Image collection coincident with field data
collection– Accurate ground control and radiometric
corrections
Potential NAFE Projects
• Three objectives:1. Forest water use
2. Productivity prediction – catchment-scale soil water holding capacity
3. The condition of crowns that are severely affected by agents that reduce crown visibility in images
Forestry: Water Use
• Forest water use an important issue– Post fire– Pasture to plantations– Effects on streamflow/groundwater
• Canopy transpiration rate• High resolution thermal imagery - midday• Field site near Mt.Gambier (SA)
– Blue gum (E.globulus) – Calibrate models to sap flow sensor data
• Calibration of imagery?
Forestry: Productivity Prediction
• Plantation productivity prediction at catchment scale– Current work focuses on recharge and discharge areas,
break of slope– Maximum benefit requires understanding of catchment-
specific hydrological processes
• Images to calibrate/validate catchment-scale soil water holding capacity prediction models– Point samples and temporal prediction
• Imagery requirements – moderate resolution radar?• Subcatchments of the S.W. Goulburn-Broken
Forestry: Invisible Crowns
• Several damaging agents increase crown transparency
• Essigella californica aphid defoliates crowns– Reduces crown visibility
• Increased light penetration causes higher vigour of understorey vegetation– Pixels over the most affected trees have high NIR
• High resolution lidar and hyperspectral imagery• Field study area in Carabost, southern NSW
(P.radiata).