$($a$)$

Figure $7-16.($a$)$ For a grid survey, land is divided into a checkerboard and labeled. $($b$)$ All grid intersections are labeled. $($c$)$ Connect the elevations with curved lines or splines. $($d$)$ Completed contour map of grid survey.

Table $7-1.$ Grid survey field notes for the map in Figure $7-16$

$\backslash$table$[[$Station$,$Elev.,Station,Elev.,Station,Elev.$],[A-0+00,90\mathrm{.}0,C-0+00,87\mathrm{.}0,E-0+00,87\mathrm{.}0],[A-0+20,94\mathrm{.}0,C-0+20,92\mathrm{.}0,E-0+20,88\mathrm{.}0],[A-0+40,100\mathrm{.}0,C-0+40,96\mathrm{.}0,E-0+40,90\mathrm{.}0],[A-0+60,110\mathrm{.}0,C-0+60,100\mathrm{.}0,E-0+60,92\mathrm{.}5],[A-0+80,110\mathrm{.}0,C-0+80,100\mathrm{.}5,E-0+80,92\mathrm{.}5],[A-1+00,102\mathrm{.}0,C-1+00,96\mathrm{.}5,E-1+00,92\mathrm{.}0],[,,,,,],[B-0+00,90\mathrm{.}0,D-0+00,86\mathrm{.}5,F-0+00,87\mathrm{.}0],[B-0+20,93\mathrm{.}0,D-0+20,90\mathrm{.}0,F-0+20,88\mathrm{.}0],[B-0+40,97\mathrm{.}0,D-0+40,94\mathrm{.}0,F-0+40,88\mathrm{.}0],[B-0+60,105\mathrm{.}0,D-0+60,97\mathrm{.}0,F-0+60,88\mathrm{.}0],[B-0+80,100\mathrm{.}0,D-0+80,95\mathrm{.}0,F-0+80,87\mathrm{.}5],[B-1+00,96\mathrm{.}0,D-1+00,94\mathrm{.}5,F-1+00,85\mathrm{.}0]]$

$\%$

$n^{}$

vec$(o)+c$

@$+$

$$

$+-$

${}^{}$