6. THE SMOOTH SHEET 



227 



complete, deficiencies at the junctions should 

 be noted for investigation when field work on 

 the project is resumed. 



6-74 Deficiencies of smooth sheets. — De- 

 ficiencies of smooth sheets fall in three gen- 

 eral categories: (1) Inadequate or inaccu- 

 rate field data (see 1-56) ; (2) unrecognized 

 or unresolved discrepancies; and (3) sub- 

 standard smooth plotting as evidenced by 

 inaccurate work or poor quality of drafting. 

 Some of these faults are traceable to lack of 

 training and careless supervision ; others re- 

 flect the aptitude of the smooth-plotter. In 

 order to produce a smooth sheet conforming 

 with Coast and Geodetic Survey standards, 

 the smooth-plotter must be thoroughly fa- 

 miliar with all the pertinent parts of this 

 manual. 



A list of the principal deficiencies of 

 smooth sheets received for verification is 

 furnished herewith. This is a partial list, 

 and the order of listing has no significance. 

 Smooth-plotters and supervisors should find 

 the list most useful in review of the smooth 

 sheet. 



(a) Positions have been incorrectly plotted 

 because the protractor was not properly ad- 

 justed or index corrections were not cor- 

 rectly applied. 



(b) Errors in recorded angles were not 

 detected and corrected. 



(c) Misidentification of signals was not 

 detected and corrected. 



(d) Positions of signals have been in- 

 correctly revised from sextant cuts. 



(e) Sounding line positions plotted from 

 weak fixes were not properly adjusted to 

 conform with supplementary information. 



(f) Soundings at inshore ends of lines 

 have been incorrectly spaced to conform with 

 change of speed or where the line began or 

 ended on an uneven interval. 



(g) Where clarification of congested areas 

 was required soundings were poorly or im- 

 properly selected. 



(h) Soundings were plotted at peaks, 

 deeps, and abrupt changes of gradient with- 

 out regard to recorded fractional sounding 

 intervals. 



(i) Soundings have been spaced at inter- 



vals which are excessively wide or unneces- 

 sarily close. 



(j) The high-water line has been inaccu- 

 rately transferred and various symbols care- 

 lessly drafted, particularly rock symbols. 



(k) Position numbers have been carelessly 

 placed and frequently obscured by soundings. 



(1) Thin black ink has been used produc- 

 ing a grey shoreline and faint colored inks 

 have been used for inking position numbers 

 or distance circles. Poor inks should be 

 discarded. 



(m) The plotter has failed to check depths 

 which appear erroneous or to investigate ex- 

 cessive differences at crossings. 



(n) Improper interpretation of fatho- 

 grams in areas of kelp or grass has not 

 been corrected by the plotter. 



(o) Shoreline has been transferred to the 

 smooth sheet from preliminary rather than 

 final photogrammetric manuscripts. 



(p) Two positions, hydrographic and topo- 

 graphic, have been shown on the smooth 

 sheet for an identical rock. 



6-75 Inspection of smooth sheet. — After 

 the smooth plotter has assured himself that 

 the survey has been correctly plotted in ev- 

 ery detail, the smooth sheet should be care- 

 fully inspected by the officer in charge of 

 processing and the chief of party. If avail- 

 able, the hydrographer should also inspect 

 the sheet. In the event that the chief of 

 party and the hydrographer have been trans- 

 ferred afar to other duties before the smooth 

 sheet is completed, the final inspection shall 

 be made by the new chief of party who shall 

 add a statement to the approval sheet in the 

 descriptive report (see 7-11) regarding his 

 inspection of the smooth sheet and accom- 

 panying records. 



6-76 Report on smooth plotting. — The 



plotter shall maintain a rough log of his 

 work as the plotting progresses in order that 

 he can write pertinent sections of the de- 

 scriptive report. See Chapter 7. When the 

 smooth sheet is plotted in a processing office, 

 the notes shall be compiled as an addendum 

 to the descriptive report (see 7-12). 



These notes should include all information 



