| CPC G01C 15/06 (2013.01) [G01C 11/00 (2013.01); G01C 11/04 (2013.01); G01C 11/06 (2013.01); G06T 7/80 (2017.01)] | 2 Claims |
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1. A target for aerial survey transformable to hand-fan shape, the target comprising:
a central axis;
a first identification marker with one end connected to the central axis, and having a first length outwards;
a second identification marker with one end connected to the central axis, and having a second length outwards, the second identification marker disposed on the first identification marker;
a third identification marker with one end connected to the central axis, and having a third length outwards, the third identification marker disposed on the second identification marker, and the third length is shorter than the second length;
a casing element having a fourth length outward which is same or longer than the first length, and configured to encase the first identification marker, the second identification marker and the third identification marker, wherein the first identification marker, the second identification marker and the third identification marker are configured to be fixed with respect to a vertical axis of the central axis and encased by the casing element; and
a binder being disposed at an opposite end to the central axis and configured to fix the first identification marker, the second identification marker and the third identification marker by being moved outwards from the central axis, wherein after moving the binder toward the central axis and opening the casing element, the first identification marker, the second identification marker and the third identification marker in the casing element are capable to be unfolded,
wherein the second length is shorter than the first length,
the first identification marker includes a plurality of first unit areas having a predetermined angle therebetween with respect to the central axis, and
the plurality of first unit areas has an overlap between adjacent first unit areas,
wherein some of the plurality of first unit areas have a first protrusion extending in a upward direction, and the remaining first unit areas have a second protrusion extending in a downward direction,
when the first unit areas are unfolded around the central axis, the overlap between the adjacent first unit areas is maintained by coupling of the first protrusion and the second protrusion,
wherein the upward direction of the first protrusion and the downward direction of the second protrusion are opposite to each other,
wherein at least some of the plurality of first unit areas include both the first protrusion and the second protrusion, the first protrusion is disposed on one side of the first unit area, and the second protrusion is disposed on the other side of the first unit area,
wherein the upward direction of the first protrusion is an upward direction, and the downward direction of the second protrusion is a downward direction,
wherein a first magnet is provided on one side of two first unit areas disposed at an edge among the plurality of first unit areas,
wherein when the first unit areas are unfolded or folded around the central axis, an unfolded state or a folded state is maintained by a contact of the two first unit areas on which the first magnet is provided,
wherein a guide rod is integrally formed with the first magnet of at least one of the two first unit areas,
wherein the second identification marker includes a plurality of second unit areas having a predetermined angle therebetween with respect to the central axis, and
the plurality of second unit areas has an overlap between adjacent second unit areas,
wherein some of the plurality of second unit areas have a third protrusion extending in the upward direction, and the remaining second unit areas have a fourth protrusion extending in the downward direction,
when the second unit areas are unfolded around the central axis, the overlap between the adjacent second unit areas is maintained by coupling of the third protrusion and the fourth protrusion,
wherein at least some of the plurality of second unit areas include both the third protrusion and the fourth protrusion, the third protrusion is disposed on one side of the second unit area, and the fourth protrusion is disposed on the other side of the second unit area,
wherein a second magnet is provided on one side of two second unit areas disposed at an edge among the plurality of second unit areas,
wherein when the second unit areas are unfolded or folded around the central axis, an unfolded state or a folded state is maintained by a contact of the two second unit areas on which the second magnet is provided,
wherein the guide rod is integrally formed further with the second magnet of at least one of the two second unit areas,
wherein the third identification marker includes a plurality of third unit areas having a predetermined angle therebetween with respect to the central axis, and
the plurality of third unit areas has an overlap between adjacent third unit areas,
wherein some of the plurality of third unit areas have a fifth protrusion extending in the upward direction, and the remaining third unit areas have a sixth protrusion extending in the downward direction,
when the third unit areas are unfolded around the central axis, the overlap between the adjacent third unit areas is maintained by coupling of the fifth protrusion and the sixth protrusion,
wherein at least some of the plurality of third unit areas include both the fifth protrusion and the sixth protrusion, the fifth protrusion is disposed on one side of the third unit area, and the sixth protrusion is disposed on the other side of the third unit area,
wherein a third magnet is provided on one side of two third unit areas disposed at an edge among the plurality of third unit areas,
wherein when the third unit areas are unfolded or folded around the central axis, an unfolded state or a folded state is maintained by a contact of the two third unit areas on which the third magnet is provided,
wherein the guide rod is integrally formed further with the third magnet of at least one of the two third unit areas,
wherein the first identification marker, the second identification and the third identification marker are configured to be attached to the guide rod, and the first identification marker, the second identification and the third identification marker are further configured to be unfolded around the central axis in a clockwise direction or a counterclockwise direction with respect to the guide rod,
wherein the first identification marker is further configured to be unfolded for a first altitude of an aerial target, the second identification marker is further configured to be unfolded for a second altitude of the aerial target, and the third identification marker is further configured to be unfolded for a third altitude of the aerial target,
wherein the first altitude is higher than the second altitude, and the second altitude is higher than the third altitude,
wherein surfaces of the unfolded first identification marker, the unfolded second identification marker, and the unfolded third identification marker are configured to have a predetermined color pattern with at least two colors such that a circle divided into four and each area is colored in white or black,
wherein the second identification marker includes a plurality of second unit areas having a predetermined angle therebetween with respect to the central axis, and the plurality of second unit areas has an overlap between adjacent second unit areas,
wherein the plurality of first unit areas has no side-to-side connection with the adjacent first unit areas,
wherein a guide rod is provided on one side of two first unit areas disposed at an edge among the plurality of first unit areas, and one side of one unit area of the second identification marker is connected to the guide rod,
wherein the first unit areas increase in width from the central axis outwards,
wherein an outer periphery of the first unit areas is curved,
wherein the first length is 50 cm, the second length is 30 cm, and the third length is 15 cm,
wherein a height of the first identification marker, the second identification marker and the third identification marker are 1 cm.
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