publications by year

Selected Publications

My CV can be found here, my Google Scholar page is here and my Research Gate page is here. Links to directly downloadable papers are provided when possible - these are for individual use only; links to journals are also provided, but might not be available to users without campus library access. All papers are available upon request.

Sunday
Jul312005

Landscape metrics in freshwater research and management

Kearns et al. 2005. Landscape Ecology. A portion of the study area around San Jose, CAWe quantified landscape composition and configuration for subwatershed areas upstream of individual sampling sites, reducing the number of metrics based on: (1) sensitivity to changes in extent and (2) redundancy, as determined by a multivariate factor analysis.

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Thursday
Jun302005

Support vector machines for predicting distribution of Sudden Oak Death in California

Guo, et al. 2005. Ecological Modeling. Predicted area of SOD risk in northern CaliforniaWe present an alternative method to conventional environmental niche modeling approaches by developing support vector machines (SVMs), which are the new generation of machine learning algorithms used to find optimal separability between classes within datasets, to predict the potential distribution of Sudden Oak Death in California.

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Wednesday
Jun292005

Decadal changes in a Pacific estuary

Byrd et al. 2005. GIScience and Remote Sensing. We used historic aerial photographs with manual and automated image classification techniques to discern decadal-scale changes to salt marshes in Elkhorn Slough, California caused by off-farm sedimentation from 1971 to 2001. Change detection identified a process of plant succession that led to arroyo willow encroachment into pickleweed marsh.

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Tuesday
May312005

Mapping oak mortality using high res CIR imagery

Kelly, et al. 2004. Photogrammetric Engineering and Remote Sensing. Supervised, unsupervised, and “hybrid” classification methods were evaluated for their accuracy in discriminating dead and dying tree crowns from bare areas and the surrounding forest mosaic utilizing 1-m ADAR imagery covering both tanoak/redwood forest and mixed hardwood stands. In both study areas the hybrid classifier significantly outperformed the other methods.

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Friday
Dec312004

Geospatial informatics for management of Sudden Oak Death

Kelly, et al. 2004. Photogrammetric Engineering and Remote Sensing. For a geographer viewing the early days of the SOD epidemic, there were several intriguing spatial aspects on which a monitoring system could be built, including: 1) disease impact was clearly visible at multiple spatial scales, making remote sensing useful in the monitoring process; 2) disease spread and consequent mortality were patchy at landscape scales, making spatial analysis useful; 3) the disease appeared to be spatially regulated, making accurate spatial data collected using GPS and maintained and mapped using GIS critical; and 4) public awareness and concern about the disease were high, and public participation was needed in the monitoring/tracking process, making webGIS and cartography immediately useful tools for information distribution and management assistance.

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Friday
Dec312004

Interpretation of scale in paired quadrat variance methods

Guo and Kelly. 2004. Journal of Vegetation Science. Previous interpretations of the variance plot of paired quadrat variance method (PQV) have been incomplete; and in this study was to clarify the interpretation of PQV, and to shed additional light on how different quadrat variance methods can be used, in concert, to measure scale in transect data.

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Sunday
Oct312004

Beetles and wood decay in coast live oaks

Švihra, et al. 2004. Journal of Aboriculture. Attacks by the oak ambrosia beetle (Monothrum scutellare) accelerated and increased the amount of wood decay in stems of downed coast live oak (Quercus agrifolia) trees.

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Saturday
Oct302004

Ranching in California's oak rangelands

Wacker and Kelly. 2004. Rangelands. We found that oak rangelands in the rapidly growing, exurban areas of western El Dorado County have undergone numerous changes in the last 50 years.

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Thursday
Sep302004

Mitigation-related changes in vernal pool edaphic settings

Wacker and Kelly. 2004. Wetlands Ecology and Management. We analyzed past mitigation practices in two rapidly growing counties in California’s Great Central Valley to determine if mitigation procedures are re-arranging the vernal pool landscape by substituting more common or less ecologically significant pool types (as defined by soil type and geomorphology) for rarer or ecologically richer pool types.

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Monday
Jul262004

Mapping diseased oak trees using ADAR imagery

Kelly and Liu. 2004. Geocarto International. We investigated the ability of high spatial-resolution 4-band imagery (Airborne Digital Acquisition and Registration - ADAR) to discern moisture stress in trees affected by Sudden Oak Death (SOD). The results suggest an inability to automate mapping of moisture stress in oaks using ADAR imagery, and limited success in using methods that require extensive field data.

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