Topographic surveying; including geographic, exploratory, and military mapping, with hints on camping, emergency surgery, and photography . Fig. 119.—Stereographic Equato- Fig. 120.—Stereographic Meridio- RiAL Projection. nal Projection. 3. Stereographic equatorial, meridional, and horizontal pro-jections. (Figs. 119, 120, and 121.). Fig. 121.—Stereographic Horizon-tal Projection. Fig. 122.—Lamberts Surkace-trieCentral Projection. Not all of these modes of map-platting find practical ap-plication. 4IO MAP CONSTRUCTION. Maps must comply with certain requirements: 1. They must be angle-true or c
Topographic surveying; including geographic, exploratory, and military mapping, with hints on camping, emergency surgery, and photography . Fig. 119.—Stereographic Equato- Fig. 120.—Stereographic Meridio- RiAL Projection. nal Projection. 3. Stereographic equatorial, meridional, and horizontal pro-jections. (Figs. 119, 120, and 121.). Fig. 121.—Stereographic Horizon-tal Projection. Fig. 122.—Lamberts Surkace-trieCentral Projection. Not all of these modes of map-platting find practical ap-plication. 4IO MAP CONSTRUCTION. Maps must comply with certain requirements: 1. They must be angle-true or conjormable; that is to say,parallels and meridians must intersect on the map at the sameangles as on the original. 2. They must be surface-true or equivalent; that is to say, theareas of given tracts on the original and on the map must agree. From the standpoint of practical cartography surface equiv-alence is most important, because geographic comparisonsrelate mostly to phenomena manifesting their unformity ordiversity over areally extended regions. From this last-namedrequirement arose especially Lamberts surface-true centralprojection, which departs from the perspective modes of plat-ting. It received its name from the fact that at all points ofequal zenith distance from the middle of the area representedthe distortio
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