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NEVADA GEOSPATICAL DATA BROWSER
Citation:
KEPNER, W. G., T. D. SAJWAJ, D. T. HEGGEM, D. F. BRADFORD, AND E. J. EVANSON. NEVADA GEOSPATICAL DATA BROWSER. U.S. Environmental Protection Agency, Washington, DC, EPA/600/C-05/005, 2005.
Impact/Purpose:
The primary objectives of this research are to:
Develop methodologies so that landscape indicator values generated from different sensors on different dates (but in the same areas) are comparable; differences in metric values result from landscape changes and not differences in the sensors;
Quantify relationships between landscape metrics generated from wall-to-wall spatial data and (1) specific parameters related to water resource conditions in different environmental settings across the US, including but not limited to nutrients, sediment, and benthic communities, and (2) multi-species habitat suitability;
Develop and validate multivariate models based on quantification studies;
Develop GIS/model assessment protocols and tools to characterize risk of nutrient and sediment TMDL exceedence;
Complete an initial draft (potentially web based) of a national landscape condition assessment.
This research directly supports long-term goals established in ORDs multiyear plans related to GPRA Goal 2 (Water) and GPRA Goal 4 (Healthy Communities and Ecosystems), although funding for this task comes from Goal 4. Relative to the GRPA Goal 2 multiyear plan, this research is intended to "provide tools to assess and diagnose impairment in aquatic systems and the sources of associated stressors." Relative to the Goal 4 Multiyear Plan this research is intended to (1) provide states and tribes with an ability to assess the condition of waterbodies in a scientifically defensible and representative way, while allowing for aggregation and assessment of trends at multiple scales, (2) assist Federal, State and Local managers in diagnosing the probable cause and forecasting future conditions in a scientifically defensible manner to protect and restore ecosystems, and (3) provide Federal, State and Local managers with a scientifically defensible way to assess current and future ecological conditions, and probable causes of impairments, and a way to evaluate alternative future management scenarios.
Description:
The Nevada Geospatial Data Browser was developed by the Landscape Ecology Branch of the U.S. Environmental Protection Agency (Las Vegas, NV) with the assistance and collaboration of the University of Idaho (Moscow, ID) and Lockheed-Martin Environmental Services Office (Las Vegas, NV). Its purpose is to centralize and distribute the geospatial data used to create the land cover, vertebrate habitat models and land stewardship data produced for the Nevada eco-regional component of the Southwest Regional GAP Analysis (SW ReGAP) project. It includes complete Geographic Information System (GIS) coverages and meta-data for the entire state of Nevada. The intent of Nevada Geospatial Data Browser is to 1) develop a central repository for the Nevada SWReGAP spatial data and 2) to provide a mechanism for public distribution of Nevada geospatial information to other researchers, public agencies, resource managers, non-governmental organizations, decision-makers, and user groups. The coverages are available for download and the meta-data include important information relative to acquisition, location, processing level, file size and format. The Gap Analysis Program (GAP) is a national inter-agency program that maps the distribution of plant communities and selected animal species and compares these distributions with land stewardship to identify biotic elements at potential risk of endangerment. GAP uses remote sensing (Landsat 7) and GIS technology to assemble and view large amounts of biological and land management data to identify areas (gaps) where conservation efforts may not be sufficient to maintain diversity of living natural resources. Historically, GAP has been conducted by individual states, however this has resulted in inconsistencies in mapped distributions of vegetation types and animal habitat across state lines because of differences in mapping and modeling protocols. This was further compounded from the lack of a national vegetation classification nomenclature. In response to these limitations, GAP embarked on a second-generation effort to conduct the program at a regional scale using 1) a vegetation classification scheme applicable across the U.S.; 2) ecoregional units as the basis for segmenting the landscape into manageable units; and 3) interagency investigator teams with land cover analysis and environmental protection expertise. The program's first formalized multi-state effort includes five Southwestern tates (i.e., Arizona, Colorado, Nevada, New Mexico, and Utah) which comprise nearly one-fifth of the conterminous United States.