Spectral Data
Both the spatial resolution, (i.e., pixel size) and spectral resolution (the width of the individual spectral wavebands over which plant response is measured) of spectral data, as well as the overall wavelength range examined (some sensors operate through the middle infrared region, some do not), can influence the ability to detect infested trees. Multispectral remotely sensed data types tend to have fewer, wider spectral wavebands and are operationally available from satellite platforms over a wide range of spatial resolution (< 1m to 30m). Landscape-scale hyperspectral data are less widely available and have a large number of very narrow wavebands. Because most available data sets are acquired from aircraft platforms, these data tend to have spatial resolution on the order of 6 to 20m. Handheld spectroradiometers with wavelength widths and numbers similar to hyperspectral sensors are often employed in the field and laboratory to study spectral response of canopy components.
- Prior Attempts to Use Spectral Imagery to Detect or Delineate Adelgid Infestations : There have been several prior studies related to the detection and classification of trees infested with invasive adelgids.
- Comparison of Hyperspectral Data for the Previsual Detection of Balsam Woolly Adelgid and Hemlock Woolly Adelgid Infestations : Our studies have used hyperspectral data collected at the branch level.
Encyclopedia ID: p3307
