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<br />\Name of Carto~ranhic Unit: <br /> <br />Defines the name of the USGS map sheet, followed by the state two-character <br />designator. The name is a string of up to 40 alph.mumeric characters. See <br />Appendix E for oversized map sheet naming convention. <br /> <br />Date of Qri~inal Source. Date of Revision: <br /> <br />Defines the year of the original digitization of the Flood Insurance Rate Map <br />followed by a comma and the year of the latest revision date if applicable. fhe <br />date may be a string of up to 10 alphanumeric characl:ers. <br /> <br />Revision Date Qualifier: <br /> <br />Qualifier to discriminate reV1S10n date if present. Code is: <br />R - Restudy, L - Limited Map Maintenance Progr.... (IlnoIP) , V - Revision under parts <br />65, 67, 70. <br /> <br />Scale of Source Material: <br /> <br />Defines the map scale. Usually 24000. <br /> <br />UTM Coordinate Zone: <br /> <br />Defines the zone in the ground planimetric reference system. Appendix C lists <br />the UTM coordinate zone codes. <br /> <br />Resolution: <br /> <br />Defines the true ground distance corresponding to one unit (0.001 inch at map <br />scale) in the file .internal coordinate system used i:o data collection. <br /> <br />Scale <br /> <br />Resolution <br /> <br />1:24,000 <br />1:25,000 <br />1:48,000 <br />1:62,500 <br /> <br />0.611'1 <br />0.6351'1 <br />1. 22M <br />1. 5871'1 <br /> <br />Map Proiection Parameters: <br /> <br />The optional DLG distribution format includes 15 fields reserved f01' map <br />proj ection parameters. These parameters are typically used as input for a <br />coordinate transformation package. <br /> <br />Yhen the ground coordinate system of a DLG is the Universal Transverse Mercator <br />system, as in the case for all DLGs digitized from 1:24,000-sca1e maps, only the <br />first two of the 15 parameter fields are used: <br /> <br />1. <br />2. <br />3-15. <br /> <br />Longitude of any point in UTM zone. <br />Latitude of any point in UTM zone. <br />Not used (-0). <br /> <br />Normally placed at the <br />center of the DLG cell. <br /> <br />10/93 <br /> <br />B <br /> <br /> <br />