QUESTIONS

directions. However, the distance scale that applies to the whole map is exact only at the standard parallels, as shown in figure 9-26. Between the parallels the scale is a little too small; beyond them, it is a little too large. The discrepancy is small enough to be ignored in work of ordinary precision or less. For work of higher precision, there are correction factors that may be applied. The Lambert conformal conic projection is the base for the state coordinate systems devised by the Coast and Geodetic Survey for zones of limited north- south dimension and indefinite east-west dimension. For zones whose greater dimension is north-south, the Coast and Geodetic Survey uses the transverse Mercator projection. Q1. Q2. Q3. QUESTIONS Which one of the wingnuts, labeled A and B, in figure 9-27 permits a leveled plane table to be rotated in azimuth? Assume you are using three-point resection to plot the location of point P and the triangle of error is inside the main triangle formed by the three known points. Where in relation to the triangle of error is point P located? What point-location method can you use to run a traverse using a plane table? 9-23 Figure 9-27.-Cross section of a plane-table tripod head. Q4. Q5. Q6. Q7. Compute the missing column entries for point 5 in figure 9-8. Why is transverse Mercator projection the pre- ferred projection method for use with the mili- tary grid reference system ? Refer to figure 9-14. What is the complete desig- nation for the first full square east of meridian 168°W and south of the equator? Measured along any meridian, what is the ap- proximate distance in statute miles between 16°30’N latitude and 0°30f$ latitude ?