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Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...will sooner or later fall into disuse../ On all recent French maps the name of the projection appears in the margin. This is excellent practice and should be followed at all times. As different projections have different distinctive properties, this feature is of no small value and may serve as a guide to an intelligible appreciation of the map. In the accompanying plate (No. I),22 North Atlantic Ocean on a Lambert oonformal conic projection, a number of great circles are plotted in red in order that their departure from a straight line on this projection may be shown. Great-circle Courses.--A great-circle course from Cape Hatteras to the English Channel, which falls within the limits of the two standard parallels, indicates a departure of only 15.6 nautical miles from a straight line on the map, in a total distance of about 3,200 nautical miles. The departure of this line on a polyconic projection is given as 40 miles in Lieut. Pillsbury's Charts and Chart Making. Distances.--The computed distance irom Pittsburgh to Constantinople is 5,277 statute miles. The distance between these points as measured by the graphic scale on the map without applying the scale factor is 5,258 statute miles, a resulting error of less than four-tenths of 1 per cent in this long distance. By applying the scale factor true results may be obtained, though it is hardly worth while to work for closer results when errors of printing and paper distortion frequently exceed the above percentage. The parallels selected as standards for the map are 36 and 54 north latitude. The coordinates for the construction of a projection with these parallels as standards are given on page 85. CONSTRUCTION OF A LAMBERT CONFORMAL CONIC PROJECTION FOR A MAP OF THE UNITED STATES. The...
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Reseña del editor
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...will sooner or later fall into disuse../ On all recent French maps the name of the projection appears in the margin. This is excellent practice and should be followed at all times. As different projections have different distinctive properties, this feature is of no small value and may serve as a guide to an intelligible appreciation of the map. In the accompanying plate (No. I),22 North Atlantic Ocean on a Lambert oonformal conic projection, a number of great circles are plotted in red in order that their departure from a straight line on this projection may be shown. Great-circle Courses.--A great-circle course from Cape Hatteras to the English Channel, which falls within the limits of the two standard parallels, indicates a departure of only 15.6 nautical miles from a straight line on the map, in a total distance of about 3,200 nautical miles. The departure of this line on a polyconic projection is given as 40 miles in Lieut. Pillsbury's Charts and Chart Making. Distances.--The computed distance irom Pittsburgh to Constantinople is 5,277 statute miles. The distance between these points as measured by the graphic scale on the map without applying the scale factor is 5,258 statute miles, a resulting error of less than four-tenths of 1 per cent in this long distance. By applying the scale factor true results may be obtained, though it is hardly worth while to work for closer results when errors of printing and paper distortion frequently exceed the above percentage. The parallels selected as standards for the map are 36 and 54 north latitude. The coordinates for the construction of a projection with these parallels as standards are given on page 85. CONSTRUCTION OF A LAMBERT CONFORMAL CONIC PROJECTION FOR A MAP OF THE UNITED STATES. The...
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