A method of measuring tides and inland water levels is provided. The method comprises a computer receiving a first measurement of an angle formed by a first ray comprising a vertical fixed piling and a second ray formed by a downward sloping ramp of known length, a lower end of the ramp contacting a surface of a dock float and the surface representing a plane contacting the fixed piling at a 90-degree angle at a first meeting point. The computer then calculates, based on the first measurement, based on the ramp length, and based on the 90-degree angle, a first distance from the first meeting point to a vertex of the angle. The computer later receives a second measurement of the angle, wherein the plane meets the piling at a second meeting point. The computer calculates a second distance and expressing a difference between two distances as tidal change.

A method of measuring tides and inland water levels is provided. The method comprises a computer receiving a first measurement of an angle formed by a first ray comprising a vertical fixed piling and a second ray formed by a downward sloping ramp of known length, a lower end of the ramp contacting a surface of a dock float and the surface representing a plane contacting the fixed piling at a 90-degree angle at a first meeting point. The computer then calculates, based on the first measurement, based on the ramp length, and based on the 90-degree angle, a first distance from the first meeting point to a vertex of the angle. The computer later receives a second measurement of the angle, wherein the plane meets the piling at a second meeting point. The computer calculates a second distance and expressing a difference between two distances as tidal change.

A method of measuring tides and inland water levels is provided. The method comprises a computer receiving a first measurement of an angle formed by a first ray comprising a vertical fixed piling and a second ray formed by a downward sloping ramp of known length, a lower end of the ramp contacting a surface of a dock float and the surface representing a plane contacting the fixed piling at a 90-degree angle at a first meeting point. The computer then calculates, based on the first measurement, based on the ramp length, and based on the 90-degree angle, a first distance from the first meeting point to a vertex of the angle. The computer later receives a second measurement of the angle, wherein the plane meets the piling at a second meeting point. The computer calculates a second distance and expressing a difference between two distances as tidal change.

A method of measuring tides and inland water levels is provided. The method comprises a computer receiving a first measurement of an angle formed by a first ray comprising a vertical fixed piling and a second ray formed by a downward sloping ramp of known length, a lower end of the ramp contacting a surface of a dock float and the surface representing a plane contacting the fixed piling at a 90-degree angle at a first meeting point. The computer then calculates, based on the first measurement, based on the ramp length, and based on the 90-degree angle, a first distance from the first meeting point to a vertex of the angle. The computer later receives a second measurement of the angle, wherein the plane meets the piling at a second meeting point. The computer calculates a second distance and expressing a difference between two distances as tidal change.

A distance measuring system for determining distance between a vehicle and an object includes a container that has a pair of slots. A vehicle is included that has a pair of forks and the pair of forks are selectively positioned between a lifted position and a lowered position. The vehicle is selectively driven toward the container having each of the forks extending into an associated one of the slots. In this way the vehicle may lift the container. A measuring unit is coupled to the forks and the measuring unit is in electrical communication with the vehicle. The measuring unit emits a first signal between the forks and the container to communicate a distance between the forks and the container to a driver. The measuring unit emits a second signal between the forks and the ground. In this way the measuring unit may communicate a height of the forks with respect to ground to the driver.

A three-dimensional measurement apparatus includes an image obtainer, a search unit, and a distance calculator. The image obtainer obtains, from an imaging device that creates a distance image where a distance value representing an imaging distance at each position within an imaging angle of view is given to a pixel at the position, the distance image. The search unit searches the distance image for a specific pixel whose distance value is a predetermined specific value. The distance calculator calculates an imaging distance of the specific pixel by referring to pixels positioned across the specific pixel.

A three-dimensional measurement apparatus includes an image obtainer, a search unit, and a distance calculator. The image obtainer obtains, from an imaging device that creates a distance image where a distance value representing an imaging distance at each position within an imaging angle of view is given to a pixel at the position, the distance image. The search unit searches the distance image for a specific pixel whose distance value is a predetermined specific value. The distance calculator calculates an imaging distance of the specific pixel by referring to pixels positioned across the specific pixel.

A survey mark for surveying a reference point situated, for example, on an object to be surveyed comprises a reflector object which has a spherical surface. The spherical surface of the reflector object has a diameter in a range of between 10 and 50 mm, preferably in a range of between 20 and 40 mm. In another aspect, a method for surveying an object to be surveyed is disclosed. The reflector object comprises at least one aiming point marking which protrudes outwardly from the spherical surface and which has a longitudinal axis (L) that passes through a central point of the reflector object.

A survey mark for surveying a reference point situated, for example, on an object to be surveyed comprises a reflector object which has a spherical surface. The spherical surface of the reflector object has a diameter in a range of between 10 and 50 mm, preferably in a range of between 20 and 40 mm. In another aspect, a method for surveying an object to be surveyed is disclosed. The reflector object comprises at least one aiming point marking which protrudes outwardly from the spherical surface and which has a longitudinal axis (L) that passes through a central point of the reflector object.