Draw contours for the following data using the grid method.

The following data of a piece of land showing spot heights at regular grid intervals was recorded.

A$1,$ A$2......$ A$5843\mathrm{.}92,847\mathrm{.}60,848\mathrm{.}44,847\mathrm{.}60,$ & $849\mathrm{.}20$

B$1,$ B$2......$ B$5848\mathrm{.}03,852\mathrm{.}01,854\mathrm{.}33,855\mathrm{.}64,$ & $854\mathrm{.}63$

C$1,$ C$2......$ C$5848\mathrm{.}51,854\mathrm{.}32,856\mathrm{.}72,858\mathrm{.}03,$ & $859\mathrm{.}34$

D$1,$ D$2......$ D$5849\mathrm{.}44,853\mathrm{.}23,854\mathrm{.}51,855\mathrm{.}24,$ & $862\mathrm{.}21$

E$1,$ E$2......$ E$5842\mathrm{.}23,839\mathrm{.}30,838\mathrm{.}32,849\mathrm{.}51,$ & $862\mathrm{.}83$

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Construct a grid of your own meaningful size and draw contours for the following sizes.

$$ i$.852$

$$ ii$.858$

iii. $848$