52 LAWS OF MARYLAND. [CH. 13

(f) "Structure" means any object or thing constructed,
erected, placed or installed above the surface of the ground,
including, but without limitation, buildings, fences, derricks,
hay stacks, poles, wires, towers and smoke-stacks;

(g) "Tree" means any object of natural growth;

59. Airport Hazards Not in Public Interest. It is hereby
found and declared that an airport hazard endangers the
lives and property of users of airports and of occupants of
land in its vicinity, and also in effect reduces the size of the
area available for the landing, taking-off and maneuvering of
aircraft, thus tending to destroy or impair the utility of the
airport and the public investment therein, and it is therefore
in the interest of the public health, public safety, or general
welfare that political subdivisions of the State be authorized
to adopt zoning regulations, as hereinafter provided in this
sub-title, or to acquire interests in property, by purchase,
grant, lease or condemnation, as hereinafter in this sub-title
provided, in order to eliminate airport hazards.

60. Adoption of Airport Zoning Regulations.

(1) For the purposes and reasons mentioned in Section 59
of this sub-title, every political subdivision may adopt, revise,
administer and enforce, under the police power, and in the
manner and upon the conditions hereinafter prescribed, air-
port zoning regulations for any airport within its corporate
limits, or outside its corporate limits to the extent, in the
manner and under the conditions provided in sub-paragraph
(4) of this Section 60, which regulations shall divide the area
surrounding the airport into districts of such number, shape
and area as may be deemed best suited to carry out the pur-
poses of this sub-title; and within such districts it may regu-
late and restrict the height of structures or trees and the
purposes for which land may be used. All such regulations
shall be uniform throughout each district, but the regulations
in one district may differ from those in other districts. In
establishing districts or in adopting or revising any such air-
port zoning regulations, the political subdivision shall reason-
ably consider, among other things, the character of the flying
operations conducted or expected to be conducted at the air-
port, the nature of the terrain, the height of existing structures
and trees above the level of the airport, the possibility of
lowering or removing existing structures or trees, and the
views of the agency of the Federal government charged with
the fostering of civil aeronautics as to the aerial approaches
necessary to safe flying operations at the airport.