New York Natural Heritage Program 200804 vector digital data http://www1.usgs.gov/vip/sahi/sahiaa.zip New York Natural Heritage Program 200805 document: technical report http://www.usgs.gov/core_science_systems/csas/vip/parks/sahi.html doi:10.5066/F7DF6P62 This shapefile depicts locations of the 17 accuracy assessment points and 6 reference points that were field sampled to assess thematic accuracy of the 2006 revised preliminary vegetation map of Sagamore Hill National Historic Site. The 17 accuracy assessment points are a subset of the 20 destination points initially selected for accuracy assessment. To identify the locations of accuracy assessment points that were field sampled to assess thematic accuracy of the Sagamore Hill National Historic Site vegetation association map. 20061018 ground condition Complete None planned Sagamore Hill National Historic Site and environs -73.503276 -73.489649 40.887510 40.883965 none thematic accuracy assessment vegetation community classification vegetation association map National Park Service National Park Service Theme Category Thesaurus Vegetation Biology ISO 19115 Topic Category biota none Sagamore Hill National Historic Site New York Oyster Bay, New York National Park System Unit Name Thesaurus Sagamore Hill National Historic Site National Park System Unit Code Thesaurus SAHI None Standardized National Vegetation Classification System vegetation classification alliance community association Kingdom Plantae none none New York Natural Heritage Program Greg Edinger Chief Ecologist mailing and physical address

625 Broadway, 5th floor

Albany New York 12233-4757 USA (518) 402-8947 (518) 402-8925 gjedinge@gw.dec.state.ny.us http://www1.usgs.gov/vip/sahi/sahiaa.pdf Locations of thematic accuracy assessment sites; low resolution for web browsing. PDF New York Natural Heritage Program Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350 New York Natural Heritage Program 200804 vector digital data This shapefile depicts locations of the 20 points selected for assessing thematic accuracy of the 2006 preliminary vegetation map of Sagamore Hill National Historic Site. ESRI point geometry. Each accuracy assessment point is represented by one point in the shapefile. All points fall within vegetation association polygons. The number and distribution of sampling points was determined according to the USGS/NPS Vegetation Mapping protocols. A stratified random sampling approach was used, distributing the sampling effort across the preliminary vegetation association map. In the preliminary vegetation association map, polygons were occasionally attributed with up to three choices for vegetation association. The first choice vegetation association was used in all cases to determine the sampling schema as outlined below. In the stratified random sampling approach, the recommended number of samples per association varies according to the rarity of the vegetation association, both in terms of number of polygons and polygon size. All of the vegetation associations in SAHI fall into the scenario for very rare associations, defined as having fewer than five polygons and occupying less than 50 hectares of the total area. In this scenario, it is recommended that one sampling point be assigned to each polygon. Before selecting accuracy assessment points, a minus fifteen (-15) meter buffer was applied to the polygons to try to eliminate potential estimated GPS error associated with the edges of the vegetation class polygons. No sample points were placed within this transition zone. In a few cases, when the polygon was too small or too narrow to support a 15-meter transition zone, the entire polygon was used as the sample point with the exact location left to the discretion of the ecologist collecting the field data. With the exception of the polygon-centroid points described above, the Generate Random Points tool in Hawth's Analysis Tools in ArcGIS 9.2 was used to determine the locations of accuracy assessment points in each polygon. In total, 20 accuracy assessment destination points were generated for field sampling. On October 18, 2006 NY Natural Heritage Chief Ecologist Greg Edinger attempted to navigate to as many of the destination accuracy assessment points as possible using a Magellan SporTrak GPS unit. The datum on the GPS unit was set to North American 1983 (Conus) and the coordinate system was set to Universal Transverse Mercator (UTM) zone 18. In most cases, three vectors (i.e., bearing and distance) were used to get within 10 meters of destination points for open communities, or 20 meters for forested communities, while remaining entirely within the target polygon as best as possible. These cut-off levels were selected based on the plot size recommended for those types. Accuracy assessment data were collected digitally in the field using an iPAQ hand-held computer with data entry software (NY Natural Heritage Hand-Held Database - HHDB) and imported to the NY Natural Heritage Field Form Database (FFDB). A total of 17 accuracy assessment points and 6 reference observation points were sampled. 200610 Vector Entity point 23 Universal Transverse Mercator 18 0.999600 -75.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000001 0.000001 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 sahi_veg_aa_sampled_2006 Shapefile attribute table New York Natural Heritage Program FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. AA_Obs_Cod Unique identification code assigned to the field-sampled accuracy assessment point New York Natural Heritage Program SAHI.1 SAHI.23 Opt2 Field used to identify reference observation points New York Natural Heritage Program [Field is blank] Point is not a reference observation point New York Natural Heritage Program reference point Point is a reference observation point New York Natural Heritage Program aa_dest Unique identification code. New York Natural Heritage Program Textual identification code. USGS/CSS/Core Science Analytics and Synthesis USGS-NPS Vegetation Characterization Program Coordinator mailing and physical address

Denver Federal Center, Building 810, MS 302

Denver Colorado 80225 (303) 202-4220 303-202-4219 gs-b-npsveg@usgs.gov Downloadable Data The U.S. Geological Survey and the National Park Service shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics (if available) are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. Any related graphics (if available) are intended to aid the data user in acquiring relevant data; it is not approriate to use the related graphics as data. The U.S. Geological Survey and the National Park Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from an U.S. Geological Survey and National Park Service servers and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. Mention of trade names or commercial products in this metadata report does not constitute endorsement or recommendation for use by the U. S. Department of the Interior, U. S. Geological Survey and National Park Service. HTML http://www.usgs.gov/core_science_systems/csas/vip/parks/sahi.html Internet Access None 200804 20100615 USGS/CSS/Core Science Analytics and Synthesis USGS-NPS Vegetation Characterization Program Coordinator mailing and physical address

Denver Federal Center, Building 810, MS 302

Denver Colorado 80225 (303) 202-4220 303-202-4219 gs-b-npsveg@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999 http://www.usgs.gov/core_science_systems/csas/metadata/index.html