CORRESPONDENCE - 75A SEXLINGER FARMHOUSE

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boundaries must be given for all properties regardless of their classifi- cation category or acreage. The verbal boundary description need not be complicated or long, but it must clearly describe (or show) the limits of the resources to ensure that a Federal agency, State historic preservation office, city planning office, planning agency, or property owner can identify the limits of a National Register property. A map drawn to a scale of at least 1 inch to 200 feet may be used in place of a verbal description. When using a map in place of a verbal description, note under the verbal boundary description that the boundaries are indicated on the accompanying map. The map must be clear and accurate. Be sure the map clearly indicates the boundaries of the property in rela- tionship to standing structures or buildings, natural features, or cultural features. Include a drawn scale and north arrow on the map. When the boundary is the same as a legally recorded boundary, refer to that legal description of the property in the verbal boundary description. Citation of the legal description (beyond parcel number or block and lot number) and deed book reference are optional. When natural or cul- tural features are used in defining boundaries, identify these features (such as street names, property lines, geographical features, or other lines of convenience) to designate the extent of the property. Begin at a fixed reference point and follow, the perim- eter of the property, including dimen- sions and directions, in the verbal boundary description. The verbal boundary description may refer to a large -scale map (such as 1 inch to 200 feet) which shows the property boundaries. large -scale maps that show streets, rights -of- ways, property lines, and building footprints are often available from the local planning agency or tax assessor's office. For large rural properties, a small -scale topographic map, such as a USGS map, may be used. If such a map is not available, draw a sketch map to scale (prefer- ably I inch to 200 feet) and show the location of the resources relative to the boundary and surrounding features. Include a north arrow, drawn scale, and date on the map. The verbal boundary description is followed by a justification of the selected boundaries. Explain how the boundaries were selected. clarify any issues that might raise questions, such as excluding portions of the historic property because of lost integrity. UNIVERSAL TRANSVERSE MERCATOR (UTM) REFERENCES Universal Transverse Mercator (UTM) references are required to indicate the location of the property. Generally, the UTM coordinates do not define the property boundaries, but provide precise locational infor- mation. Plot a single UTM reference on a 7.5 minute series USGS map for a small property; plot three or more UTM references that define the vertices of a polygon encompassing the area to be registered for properties over 10 acres. UTM references may also be used to define boundaries (for example, large rural properties lacking appropriate cultural or natural features to define boundaries). When UTM references define bound- aries, the references must correspond exactly with the property's bound- aries. For additional guidance, see National Register Bulletin: How to Complete the National Register Registra- tion Form and National Register Bulle- tin: Using the UTM Grid System to Record Historic Sites. GLOBAL POSITIONING SYSTEM (GPS) The Global Positioning System (GPS) technology now can be used to define boundaries for National Register properties. GPS technology records (digitizes) the location of lines, points, or polygons on the earth's surface using tnlateration from satellites orbiting the earth. The locational accuracy of the data varies between 2 and 5 meters (when using differential correction). Thus, districts and archeological sites can be digi- tized as polygons, and historic trains or roads, as lines. The result is a potential National Register boundary. With GPS, the UTM references are automatically calculated along with any other type of descriptive data, such as condition, materials, intru- sions, and integrity. Data from GPS is generally entered into a Geographic Information System (GIS). Using GIS, boundary data can be combined with data on cultural and natural features, such as roads, rivers, and land cover, to yield a composite map suitable for inclusion with the registration form.