Topographic maps and sketch mapping . ( b) Intersection. ^ (c) Offset Pig. 59.—Methods of Locating Details. cases it is unnecessary to actually measure the offset, as anexperienced mapper can estimate it with sufficient accuracy. Students should understand that in the process of roadmapping both the traversing and the location of details are LOCATION OF DETAILS 105 carried on simultaneously and the details are mapped infrom each set-up as the traverse is run. In order that themapping may proceed rapidly and in a systematic way whichwill eliminate blunders the following procedure should befollo
Topographic maps and sketch mapping . ( b) Intersection. ^ (c) Offset Pig. 59.—Methods of Locating Details. cases it is unnecessary to actually measure the offset, as anexperienced mapper can estimate it with sufficient accuracy. Students should understand that in the process of roadmapping both the traversing and the location of details are LOCATION OF DETAILS 105 carried on simultaneously and the details are mapped infrom each set-up as the traverse is run. In order that themapping may proceed rapidly and in a systematic way whichwill eliminate blunders the following procedure should befollowed: 1. Set up the board at the initial point selected for thefirst set-up, turn the board so that its edges are north andsouth, and by means of a compass or watch draw a northpointer for the map. 2. Select a point on the board to represent the initial orstarting point which the board is set up over. In selectingthis point estimate where it had best be placed so that themap will not run off the edges of the paper. 3. While the mapper is doing this, o
Size: 1901px × 1315px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectcartogr, bookyear1920
