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<br />. If non-zero, the minor code which follows is a parameter requiring <br />special interpretation according to instructions given in the codes <br />for each category. <br /> <br />Minor Attribute Codes <br /> <br />The first digit of the minor code is normally zero. If non-zero, it is used as <br />a modifier to provide additional information. The remaining three digits are <br />normally used to indicate the cartographic interpretation to be applied to <br />specific elements. The type of element described by a particular code usually <br />can be determined from the range of value of the last three digits: <br /> <br />001 <br />100 <br />200 <br />300 <br />400 <br /> <br />099 <br />199 <br />299 <br />399 <br />499 <br /> <br />nodes <br />areas <br />lines <br />degenerate lines <br />codes which may be applied to any element type <br />(nodes, lines, areas, or points) <br />- general descriptive codes <br /> <br />601 <br /> <br />699 <br /> <br />The last three digits (and occasionally all four digits) also may be used as a <br />parameter code. Parameters are used when a minor code can legitimately assume <br />a range of values, such as a water elevation. The meaning of a parameter code <br />is indicated by the (non-zero) third digit of the major code. <br /> <br />Specifications <br /> <br />Specifications <br />subj ect areas: <br />format, <br /> <br />for DLG data will be <br />coordinate systems. <br /> <br />described by considering the following <br />cell size and extent, and distribution <br /> <br />Coordinate Svstems <br /> <br />The DLG data published by FEMA are expressed in the units of the respective <br />ground coordinate systems: that is, meters in the Universal Transverse Mercator <br />(UTM) system. <br /> <br />Cell Size and File Extent <br /> <br />In general the DLGs are stored and distributed in standard cells of 7.S-minutes <br />of latitude by 7.S-minutes of longitude. Non-standard quadrangles which have a <br />neatline extended to accommodate overedge information, (e. g. along national <br />boundaries or in coastal areas) are collected as multiple 7.S-minute units (see <br />Appendix E for overedge naming conventions). In Alaska, DLGs are stored in cells <br />varying from lO-minutes to 18-minutes of longitude, by 7.S-minutes of latitude, <br />depending on the latitude of the cell. <br /> <br />10/93 <br /> <br />S <br />