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Last modified
1/25/2010 6:45:31 PM
Creation date
10/5/2006 12:23:57 AM
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Title
Specifications for Photogrammetric Services for Floodplain Studies in Colorado
Date
8/1/1982
Prepared By
CWCB
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />, <br /> <br />rock outcrops, or they may be set in the top of <br />concrete extending into the ground to the frost-line <br />depth, but not less than 36", as shown in Exhibit 2. <br />All monuments shall be set and referenced as described <br />in Exhibits 2 and 3. <br /> <br />K. Control Markers. All permanent and semi-permanent <br />control markers used for mapping instrument surveys <br />shall be shown and their respective elevations labeled <br />on the map. A summary listing showing northing, <br />easting, elevation, and a brief description of all <br />control markers and monuments is required. (See <br />Exhibit 3.) <br /> <br />L. Cross Sections. All field-surveyed and dig i tized cross <br />sectlons shall meet the following vertical tolerance as <br />related to ,true elevations: <br /> <br />1. All spot elevation points shall be wi thin + 0.5'. <br /> <br />2. The horizontal position of the cross-section data <br />points shall be referenced in such a manner that <br />their location can be reestablished within + 5.0'. <br /> <br />3. The cross-section alignment shall be shown on <br />finished mylar maps by a 0.005" scribed line with a <br />dot at the terminal points. The respective <br />horizontal coordinate values shall also be given on <br />the map. <br /> <br />4. Exhibit 1 prescribes the procedure for obta,ining <br />cross-section data. <br /> <br />M. Map Type. The CWCB will specify whether the final <br />maps wlll be line maps showing contours and topographic <br />features or maps showing contours with a photographic <br />background. <br /> <br />N. Photogra hic-Background Ma s. When photographic- <br />ac groun mapplnq lS specl led, the maps shall be <br />developed by either conventional rectification methods <br />or by orthogonal projection (orthophoto). <br /> <br />1. General. All photographic maps shall be clear and <br />free from chemicals, stains, blemishes, uneven <br />spots, air bells, light fog, oil streaks, creases, <br />scratches, and other defects which would interfere <br />with their use or in any way decrease their <br />usefulness. The final maps shall be on material <br />capable of being inked, erased, and reinked on <br /> <br />-4- <br />
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