http://www.nbii.gov/metadata/mdata/NASA/nasa_d_FEDGPS1293.xml Elizabeth M. Nel; NASA Goddard Space Flight Center, Forest Ecosystem Dynamics Project 1994 Maps and Data http://fedwww.gsfc.nasa.gov/ The Biospheric Sciences Branch (formerly Earth Resources Branch) within the Laboratory for Terrestrial Physics at NASA's Goddard Space Flight Center and associated University investigators are involved in a research program entitled Forest Ecosystem Dynamics (FED) which is fundamentally concerned with vegetation change of forest ecosystems at local to regional spatial scales (100 to 10,000 meters) and temporal scales ranging from monthly to decadal periods (10 to 100 years). The nature and extent of the impacts of these changes, as well as the feedbacks to global climate, may be addressed through modeling the interactions of the vegetation, soil, and energy components of the boreal ecosystem. The Howland Forest research site lies within the Northern Experimental Forest of International Paper. The natural stands in this boreal-northern hardwood transitional forest consist of spruce-hemlock-fir, aspen-birch, and hemlock-hardwood mixtures. The topography of the region varies from flat to gently rolling, with a maximum elevation change of less than 68 m within 10 km. Due to the region's glacial history, soil drainage classes within a small area may vary widely, from well drained to poorly drained. Consequently, an elaborate patchwork of forest communities has developed, supporting exceptional local species diversity. This data set is in ARC/INFO export format and contains Global Positioning Systems (GPS) ground control points in and around the International Paper Experimental Forest, Howland ME. The field measurements component of the FED project was initiated to acquire data which are needed to: * improve our understanding of vegetation, soil, and energy dynamics, and other biotic and abiotic processes within forested ecosystems so that the models can be parameterized, updated and modified; and to * acquire in situ field observations for comparison with model results and conceptual model refinement. 19931201 19931231 publication date Complete As needed The study site is located 56 km north of Bangor, Maine in Penobscot County (45 12'N, 68 44'W). The area is within the 7000 ha Northern Experimental Forest (NEF) owned by International Paper. -68.0 -68.0 45 45.0 ISO Topic Category ENVIRONMENT IMAGERY/BASE MAPS/EARTH COVER PLANNING CADASTRE GCMD Science Keywords EARTH SCIENCE > HUMAN DIMENSIONS > LAND USE/LAND COVER > LAND MANAGEMENT > GROUND CONTROL POINT SATELLITES GPS > GLOBAL POSITIONING SYSTEM FED > FOREST ECOSYSTEM DYNAMICS None Easting GIS Northing GCMD CONTINENT > NORTH AMERICA CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MAINE None Some coordinates are corrected to a greater positional accuracy than others. Darrel L. Williams TECHNICAL CONTACT Mailing and Physical Address

NASA's Goddard Space Flight Center

Mailstop 614.0

Greenbelt MD 21227 USA 301.614.6049 Darrel.L.Williams@nasa.gov UNIX Nel, E.M. and M.E. Jackson 1993 Publication Unpublished Report n/a Levine, E., K.J. Ranson, J.A. Smith, D.L. Williams, R.G. Knox, H.H. Shugart, D.L. Urban, and W.T. Lawrence Unknown Publication Ecological Modeling 65: 199-219 Information available at the FED website: http://fedwww.gsfc.nasa.gov/ Point features present. A Trimble roving receiver placed on the top of the cab of a pick-up truck and leveled was used to collect position information at selected sites (road intersections) across the FED project study area. The field collected data was differentially corrected using base files measured by a Trimble Community Base Station. The Community Base Station is run by the Forestry Department at the University of Maine, Orono (UMO). The base station was surveyed by the Surveying Engineering Department at UMO using classical geodetic methods. Trimble software was used to produce coordinates in Universal Transverse Mercator (UTM) WGS84. Coordinates were adjusted based on field notes. All points were collected during December 1993 and differentially corrected. GENERATE LIZEGPS_84 199501 1521 BUILD LIZEGPS_84 POINT 199501 1522 COPY LIZEGPS_84 /NET/FOREST/HOME/FED-GIS/GPS_GCP/LIZEGPS_84 199502 1524 LARA RENAME LIZEGPS_84 GPS_1293 199502 1731 LARA DOCUMENT GPS_1293 CREATE LARA 199502 1745 LARA PROJECTDEFINE COVER GPS_1293 199502 1836 Point Point 27 String Ring composed of chains Universal Transverse Mercator 19 0.9996 0 0 0 0 coordinate pair 40 40 meters World Geodetic System of 1984 6378137 298.25722210088 GPS_1293.PAT GPS differential correction information E. Nel AREA Degenerate area of point FED '0' number none PERIMETER Degenerate perimeter of point FED '0' number none GPS_1293# Internal feature number Computed Sequential unique positive integer number none GPS_1293-ID User-assigned feature number User-defined Integer number none CODE Site ID E. Nel Real numbers number none NUM_MEAS Number of GPS fixes at location E. Nel Real numbers number none Num_meas - Number of measurements used for differential correction. If num_meas is 180 or greater, the positional accuracy of the GPS coordinate is sub-meter. If num_meas is less than 180 but greater that 0, the positional accuracy is estimated at 10 meters based on Nels and Jackson, 1993. If num_meas is 0, the positional accuracy is estimated at 12 to 40 meters, based on published median error ranges. The following measurements are included: Site ID, Number of GPS Fixes at Location, Degenerate Area/Perimeter of Point Forest Ecosystem Dynamics Project, Biospheric Sciences Branch, Hydrospheric and Biospheric Sciences Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA KENNETH JON RANSON DATA CENTER CONTACT Mailing and Physical Address

NASA

Goddard Space Flight Center

Mailstop 614.4

Greenbelt MD 20771 USA 301-614-6650 301-614-6695 Kenneth.J.Ranson@nasa.gov None ARC/INFO No compression applied http://fedwww.gsfc.nasa.gov/gis_data/gps_1293.e00 FED Data: GPS ground control points and field site locations from 12/93 None 20090322 NASA (National Aeronautics and Space Administration)/GCMD (Goddard Space Flight Center) Mailing and Physical Address

Goddard Space Flight Center

Code 610.2

Greenbelt MD 20771 USA 301.614.6163 gsfc-gcmduso@mail.nasa.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998