Next Article in Journal
Information Theory Filters for Wavelet Packet Coefficient Selection with Application to Corrosion Type Identification from Acoustic Emission Signals
Next Article in Special Issue
Application of Composite Dictionary Multi-Atom Matching in Gear Fault Diagnosis
Previous Article in Journal
A Cabled Acoustic Telemetry System for Detecting and Tracking Juvenile Salmon: Part 2. Three-Dimensional Tracking and Passage Outcomes
Previous Article in Special Issue
Next Generation AT-Cut Quartz Crystal Sensing Devices
Article

Assessment of Acacia Koa Forest Health across Environmental Gradients in Hawai‘i Using Fine Resolution Remote Sensing and GIS

1
Charles Darwin Foundation, Puerto Ayora, Galapagos, Ecuador
2
Department of Natural Resources and Environmental Management, University of Hawai‘i at Mānoa, Honolulu, HI 96822, USA
*
Authors to whom correspondence should be addressed.
Sensors 2011, 11(6), 5677-5694; https://doi.org/10.3390/s110605677
Received: 25 April 2011 / Revised: 16 May 2011 / Accepted: 16 May 2011 / Published: 27 May 2011
(This article belongs to the Special Issue 10 Years Sensors - A Decade of Publishing)
Koa (Acacia koa) forests are found across broad environmental gradients in the Hawai‘ian Islands. Previous studies have identified koa forest health problems and dieback at the plot level, but landscape level patterns remain unstudied. The availability of high-resolution satellite images from the new GeoEye1 satellite offers the opportunity to conduct landscape-level assessments of forest health. The goal of this study was to develop integrated remote sensing and geographic information systems (GIS) methodologies to characterize the health of koa forests and model the spatial distribution and variability of koa forest dieback patterns across an elevation range of 600–1,000 m asl in the island of Kaua‘i, which correspond to gradients of temperature and rainfall ranging from 17–20 °C mean annual temperature and 750–1,500 mm mean annual precipitation. GeoEye1 satellite imagery of koa stands was analyzed using supervised classification techniques based on the analysis of 0.5-m pixel multispectral bands. There was clear differentiation of native koa forest from areas dominated by introduced tree species and differentiation of healthy koa stands from those exhibiting dieback symptoms. The area ratio of healthy koa to koa dieback corresponded linearly to changes in temperature across the environmental gradient, with koa dieback at higher relative abundance in warmer areas. A landscape-scale map of healthy koa forest and dieback distribution demonstrated both the general trend with elevation and the small-scale heterogeneity that exists within particular elevations. The application of these classification techniques with fine spatial resolution imagery can improve the accuracy of koa forest inventory and mapping across the islands of Hawai‘i. Such findings should also improve ecological restoration, conservation and silviculture of this important native tree species. View Full-Text
Keywords: forest health; dieback; Acacia koa; Hawaii; GeoEye; remote sensing; GIS forest health; dieback; Acacia koa; Hawaii; GeoEye; remote sensing; GIS
Show Figures

MDPI and ACS Style

Morales, R.M.; Idol, T.; Friday, J.B. Assessment of Acacia Koa Forest Health across Environmental Gradients in Hawai‘i Using Fine Resolution Remote Sensing and GIS. Sensors 2011, 11, 5677-5694. https://doi.org/10.3390/s110605677

AMA Style

Morales RM, Idol T, Friday JB. Assessment of Acacia Koa Forest Health across Environmental Gradients in Hawai‘i Using Fine Resolution Remote Sensing and GIS. Sensors. 2011; 11(6):5677-5694. https://doi.org/10.3390/s110605677

Chicago/Turabian Style

Morales, Rodolfo Martinez, Travis Idol, and James B. Friday 2011. "Assessment of Acacia Koa Forest Health across Environmental Gradients in Hawai‘i Using Fine Resolution Remote Sensing and GIS" Sensors 11, no. 6: 5677-5694. https://doi.org/10.3390/s110605677

Find Other Styles

Article Access Map by Country/Region

1
Only visits after 24 November 2015 are recorded.
Back to TopTop