Indiana Code Title 36. Local Government § 36-7-3-4

Sec. 4.  (a) A municipality that does not have a sufficient survey and plat of its corporate territory may, by a resolution of its legislative body passed by a two-thirds ( 2/3 ) vote, order a survey and plat of the municipality.  When the survey and plat have been made, the legislative body may adopt them by a resolution passed by three-fourths ( 3/4 ) vote (as described in IC 36-1-8-14).  If a survey and plat of the municipality have already been made, without the order of the legislative body, it may adopt them by a resolution passed by a three-fourths ( 3/4 ) vote.

(b) The survey and plat are considered adopted by the municipality for all purposes if a certified copy of the resolution adopting the survey and plat is:

The copy of the resolution must include a statement of the names of the persons voting for and against it.