The Alaska daily empire., 1921-11-10
NEW BASE MAP OF ALASKA HAS
 BEEN PRINTED
Map Issued by Coast and Geodetic Survey - Has
 Valuable Information.

The U. s. Coast and Geodetic Sur vey of the Department of Commerce reports the completion of a new out line map of Alaska on the Lambert conformal comic projection, scale one five-millionths dimensions, TX 261a inches
 The map extends from the Arctic Ocean in the north to the state of Washington in the south, and in cludes all of the Aleutian Islands and I part of Eastern Siberia. It is in tended merely as base map to which may be added any kind of spe- cial information that may be desired For this reason, only national boun- daries. the adjacent Canadian prov inces and the names of q few or the important towns are given. The shoreline is compiled from the most recent Coast and Geodetic Survey Alaska and westward to Kodiak Island. the coastline is better repro scented than heretofore. The accum- llation of the yearly surveys in the extensive and largely unsurveyed waters of Alaska as here embodied, presents a dalineation of the coast line in more really true shape than heretofore and in this respect the map is more reliable than other ex- istipg maps of similar scale
 Tn addition to this feature, the employment of a more suitable sys- tenn of map projection adds to the general accuracy. On account of the predominating east and west extent of Alaska, the Lambert conformal comic projection with two standard parallels offers advantages over oth- CT projections formerly used in map ping this region. This is the system which came to prominent notice dur ing the World War and was employed by the allied forces in their military operations in France.
 The parallels employed as stand ards are the attitudes 5 and 6 de grees, and along these parallels the scale is true Between these parN- lels the scale becomes too small bN less than four-tenths of one per cent. which amount is ins ignificant Al Dixon entrance in Southeast Alaska, the former general chart of Alaska on poyconie projection was in CT TOT by as much as 10 per cent, due to a system of projection which was JnCnjt cd A tbq Ghann nf thn iO- volved In the new base map, the rrojection error in this locality is entirely eliminated The maximum error of scale of the Lambert pro jcction is only 1 34 per cent. This is in the latitude of Pt. Barrow in the this amount The same amount of error appears in latitude AS degrees. but this is considerably south of Al aska, which is the subject of the map. The polyconic projection had the effect of exaggerating areas in the most important part of Alaska whereas in the Lambert projection the maximum scale error is placed in the least important part of Alaska. and in amount is only one-sixth as large as in the polyconic projection
 For the measurement of distances and areas within the extent of the map, an accuracy is thus obtained that is well within the limits of craftsmanship, paper distortion and our knowledge of this region as a whole
 The selection of a suitable projec. tionz with conformal grid system of one degree units. makes the new outline map convenient base for the addition of special and useful in- formation The inclusion of the northwest part of the state of Wash ington serves as a connecting link with a similar Lambert conformal base map of the United States which has already been published on the samescale.