LEMMA Team Detail
 | Heather May Database Administrator/GIS Analyst Dept. of Forest Ecosystems and Society Oregon State University | Mailing address: Department of Forest Ecosystems & Society Phone:Oregon State University 321 Richardson Hall Corvallis, OR 97331 (541) 750-7347 Email: |
Educational Background
B.S., 2001 (computer and information science), University of Oregon, Eugene, OR
B.S., 2001 (environmental studies), University of Oregon, Eugene, OR
Research Interests
Heather is interested in all aspects of natural resource management, and she enjoys using her technical skills to assist in the compilation and analysis of environmental data. Specific interests include: Modeling ecosystem processes at various scales; Developing large-scale database management systems; Using design patterns and object-oriented development techniques to build robust and flexible software applications.
Biography
Heather has been a database administrator and GIS analyst on the LEMMA team since 2006. She spends most of her time developing and managing the database that contains input data for the GNN models, but she also processes spatial data layers and has been designing and implementing systems for documentation. From 2001-2006 she worked as a database administrator and field technician for Dorena Genetic Resource Center, which is a Forest Service research station that specializes in breeding tree populations that are naturally resistant to invasive pathogens. In her free time, Heather likes practicing yoga; exploring the outdoors on foot, ski, or bicycle; and watching movies.
Other Publications and Reports
| Grossmann, EB, JL Ohmann, J Kagan, HK May, MJ Gregory. Submitted. Mapping ecological systems with a random forest model: tradeoffs between errors and bias. USGS GAP Bulletin. | |
 | Grossmann, EB, JL Ohmann, MJ Gregory, HK May. 2009. Nationwide Forest Imputation Study (NaFIS) - Western Team final report. Final Report of the Nationwide Forest Imputation Study (NaFIS). |
| Grossmann, EB, J Kagan, JL Ohmann, HK May, MJ Gregory, C Tobalske. 2008. Final report on land cover mapping methods, map zones 2 and 7, Pacific Northwest ReGAP. Institute for Natural Resources, Oregon State University, Corvallis, OR. |
| May, HK, JS Conery. 2003. FOREST: A System for Developing and Evaluating Ecosystem Simulation Models. Proceedings from Summer Computer Simulation Conference: Montreal, Quebec; July 2003. |
Presentations
 | Grossmann, EB, JL Ohmann, MJ Gregory, HK May. 2009. Gradients or hierarchies? Which assumptions make a better map?. US Regional Association of the International Association of Landscape Ecology Annual Meeting: Snowbird, UT; April 2009. |
| Grossmann, EB, JL Ohmann, MJ Gregory, HK May. 2009. Regional vegetation mapping: Making sense of the methods. Workshop on remote sensing for land managers: Redding, CA; June 2009. |
| Grossmann, EB, JL Ohmann, MJ Gregory, HK May. 2009. Bringing our best data into conservation and restoration planning. California Klamath-Siskiyou Fire Learning Network Workshop: Weaverville, CA; July 2009. |
| Grossmann, EB, JL Ohmann, MJ Gregory, HK May. 2009. Regional vegetation - methods behind the maps: Gradient Nearest Neighbor and random forest modeling. Information Sharing Workshop, Bureau of Land Management: Salem, OR; April 2009. |
| Gregory, MJ, JL Ohmann, EB Grossmann, HK May. 2008. Spatial scaling effects of inventory reference data on nearest neighbor model predictions. Forest Inventory and Analysis Symposium: Park City, UT; October 2008. |
| Gregory, MJ, JL Ohmann, HK May, EB Grossmann, KB Pierce Jr., TM Holt, JS Fried. 2008. Recent advances and applications of nearest neighbors methods for regional-scale forest vegetation modeling. Department of Forest Science Seminar: Corvallis, OR; April 2008. |
| Grossmann, EB, JL Ohmann, J Kagan, KB Pierce Jr., HK May, MJ Gregory. 2008. Random forests and nearest neighbors: Methods for mapping the West Cascades of Oregon. US Regional Association of the International Association of Landscape Ecology Annual Meeting: Madison, WI; April 2008. |
| Grossmann, EB, JL Ohmann, MJ Gregory, HK May. 2008. Is the World a Gradient, or a Hierarchy of Thresholds? Imputing Forest Composition and Structure Variables in the Pacific Northwest. Forest Inventory and Analysis Symposium: Park City, UT; October 2008. |
| Ohmann, JL, M Moeur, M Hemstrom, T Burcsu, J Merzenich, MJ Gregory, HK May, EB Grossmann. 2008. Integrating forest inventory data, vegetation maps, and models of vegetation dynamics to support landscape analysis and planning: the IMAP story. Forest Inventory and Analysis Symposium: Park City, UT; October 2008. |
| Ohmann, JL, MJ Gregory, HK May, EB Grossmann. 2008. Gradient Nearest Neighbor (GNN) maps of forest vegetation: accuracy assessment and uncertainty. Interagency Mapping and Assessment Project (IMAP) Users' Group: Portland, OR; February 2008. | |
| Grossmann, EB, JL Ohmann, J Kagan, KB Pierce Jr., HK May, MJ Gregory. 2007. Models for ecological systems map building: random forest and gradient nearest neighbor. Which one works best?. National GAP Analysis Program Conference: Asheville, NC; September 2007. |
| Ohmann, JL, KB Pierce Jr., EB Grossmann, MJ Gregory, HK May, TM Holt. 2007. Current Vegetation Mapping in Western Oregon. Presented at: USFS Klamath Falls Ranger District: Klamath Falls, OR; June 2007. |
| Ohmann, JL, MJ Gregory, KB Pierce Jr., HK May, EB Grossmann. 2007. Seeing the forest and the trees: harnessing GIS to map forests of the Pacific Northwest. Keynote address to GIS Day: Corvallis, OR; November 2007. |
| Ohmann, JL, KB Pierce Jr., EB Grossmann, MJ Gregory, HK May, TM Holt. 2006. Mapping current vegetation in the Pacific Coast States with GNN, CART, and other tricks. Workshop and field tour with NF, ODF, TNC, and R6: Sycan Marsh Research Station, OR; September 2006. |
| Ohmann, JL, MJ Gregory, KB Pierce Jr., TM Holt, HK May. 2006. Mapping forest species and plant communities with Gradient Nearest Neighbor imputation. 2006 Nearest Neighbors Workshop - Meeting in the Middle: Minneapolis, MN; August 2006. |
| May, HK. 2005. Database development for the Port-Orford-cedar resistance breeding program. Port-Orford-cedar Technical Team Meeting: Hoopa, CA; June 2005. |
Posters
| Grossmann, EB, JL Ohmann, HK May, MJ Gregory. 2009. Mapping mountain hemlock and pinpointing ponderosa pine: Imputation mapping species distributions in Western Oregon. North American Forest Ecology Workshop: Logan, UT; June 2009. |
| Ohmann, JL, MJ Gregory, HK May, EB Grossmann, RE Kennedy, WB Cohen, Z Yang, E Pfaff, M Moeur. 2009. Spatial monitoring of disturbance and late-succesional forest dynamics in the Pacific Northwest. US Regional Association of the International Association of Landscape Ecology Annual Meeting: Snowbird, UT; April 2009. |
| Grossmann, EB, JL Ohmann, J Kagan, MJ Gregory, HK May. 2008. Context-dependent hierarchy of plant community predictors from the Oregon Coast Range to the eastern slopes of the Cascade Mountains. Ecological Society of America Annual Meeting: Milwaukee, WI; August 2008. |
| Ohmann, JL, MJ Gregory, JD Kline, RJ Alig, HK May, EB Grossmann. 2008. Implications of social and ecological gradients for conservation planning in large, multi-ownership, forested landscapes. US Regional Association of the International Association of Landscape Ecology Annual Meeting: Madison, WI; April 2008. | |
| Grossmann, EB, JL Ohmann, J Kagan, KB Pierce Jr., HK May, MJ Gregory. 2007. A tale of two techniques: Gradient Nearest Neighbor and random forest for mapping ecological systems in Oregon's Western Cascades. North American Forest Ecology Workshop: Vancouver, BC; June 2007. |