Nautical charts . sftr 32 35 36 34 Mat 24 37 sft. 26 s ft 24 36 FIG. 20. PORTION OF CHART OF PONCE HARBOR, SCALE 1-20000, TO SHOWSELECTION OF SOUNDINGS FROM ORIGINAL SURVEY GIVEN BELOW. FIG. 21, HYDROGRAPHIC SURVEY OF SAME PORTION OF PONCE HARBOR, REDUCEDTO ONE-HALF SCALE OF ORIGINAL SHEET. (65) PREPARATION OF INFORMATION FOR CHARTS. Chart schemes. Before commencing the prepara-tion of a chart it is necessary to arrange a definite schemefor it, and the usefulness of the chart will dependmaterially on this preliminary plan, in which mustbe outlined its scale, size, limits, and features to berep
Nautical charts . sftr 32 35 36 34 Mat 24 37 sft. 26 s ft 24 36 FIG. 20. PORTION OF CHART OF PONCE HARBOR, SCALE 1-20000, TO SHOWSELECTION OF SOUNDINGS FROM ORIGINAL SURVEY GIVEN BELOW. FIG. 21, HYDROGRAPHIC SURVEY OF SAME PORTION OF PONCE HARBOR, REDUCEDTO ONE-HALF SCALE OF ORIGINAL SHEET. (65) PREPARATION OF INFORMATION FOR CHARTS. Chart schemes. Before commencing the prepara-tion of a chart it is necessary to arrange a definite schemefor it, and the usefulness of the chart will dependmaterially on this preliminary plan, in which mustbe outlined its scale, size, limits, and features to berepresented. New charts have sometimes been pre-pared simply to fit the surveys as they progressed orto fill immediate or local requirements. It is, however,desirable that general plans for series or groups ofcharts be made, and with changing needs, information,and conditions it is sometimes necessary that existingschemes be modified. Compilation of information. Considerable work mustusually be done to get the field records in shape forthe published chart. The soundings must be plottedand the characteristic depths selected. Only a part ofthe soundings that are made can be shown on
Size: 1947px × 1283px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookp, booksubjectnauticalcharts
