A device and methods of placing the device for indicating tidal water depth is described. The device having a body in a vertical orientation, with a top, bottom, and at least one viewing surface, with a measurement scale of numerals and marks displayed on the at least one viewing surface, where the numerals increase in value in a direction from the bottom towards the top of the body.

An optical fiber sensing system according to the present disclosure includes: an optical fiber (11) configured to sense water pressure change caused by an event that has occurred in an observation region, the optical fiber being disposed in water; a reception unit (20) configured to receive a light signal from the optical fiber (11); and an identification unit (30) configured to detect distribution of water pressure and time fluctuation of water pressure in the observation region based on a pattern of the light signal, and to identify an event that has occurred in the observation region based on the detection result.

The present specification relates to image capture. More specifically, it relates to selective image capture for sensor carrying devices or floats deployed, for example, on the open sea. In one form, data is generated on the sensor carrying devices or floats by an on-board Inertial Measurement Unit (IMU) and is used to automatically predict the wave motion of the sea. These predictions are then used to determine an acceptable set of motion parameters that are used to trigger the on-board camera(s). The camera(s) then capture images. One consideration is that images captured at or near the peak of a wave crest with minimal pitch and roll will contain fewer obstructions (such as other waves). Such images provide a view further into the horizon to, for example, monitor maritime sea traffic and other phenomenon. Therefore, the likelihood of capturing interesting objects such as ships, boats, garbage, birds, . . . etc. is increased. These images may then be further processed and/or transmitted in a variety of manners.

Various examples are provided for systems and methods for geodesy in shallow water. In one example, a method includes obtaining, from a sensor module, a position of a superstructure of a moored device. At least one measurement corresponding to a heading, a pitch, or a roll of the superstructure can be obtained from the sensor module. An estimated position of an anchor, ballast, or other seafloor marker of the moored device can be determined based on the position of the superstructure and at least one corrected heading associated with the at least one measurement. The at least one corrected heading can be determined by applying a magnetic declination correction to the at least one measurement.

The present application relates to a method for selecting a wave height threshold, based on a target location, original wave height samples are acquired, and a wave height threshold interval are obtained; combined with wave height threshold and based on GPD and specified return period, a design wave height Hs.sub.i,j corresponding to each threshold within the wave height threshold interval is calculated according to the sample wave height values which are greater that the threshold; a difference is calculated to obtain a stable threshold interval, and a threshold within the stable threshold interval is selected as a reasonable threshold for design wave height estimation. In this method, the stability of estimated values can be determined directly and objectively to realize wave height threshold selection.

The invention relates to an apparatus for the calibration of a thermometer in situ, wherein the apparatus has a temperature sensor (S) for determining a temperature (T); wherein a reference element (K) is provided for calibrating the temperature sensor (S); wherein the reference element (K) at least partially comprises a ferroelectric material (D), which experiences a phase transformation at at least one predetermined temperature (T.sub.Ph) in a temperature range relevant for calibrating the temperature sensor (S).

A method and a device for determining and displaying a flyaway distance for a rotorcraft in the event of an engine of the rotorcraft failing, and while taking account of the height of waves being overflown by the rotorcraft. The method includes a first determination for determining a flyaway distance of the rotorcraft in the event of a failure of an engine and under current flying conditions, a second determination for determining a maximum altitude of the waves being overflown by the rotorcraft and displaying the flyaway distance and the maximum altitude on a display instrument of the rotorcraft indicating the relative height of the rotorcraft or else its altitude. A safety margin is preferably added to the maximum altitude of the waves, or else to the flyaway distance of the rotorcraft.

A method of determining the draft of a vessel comprising the steps of: measuring the draft of the vessel using at least one optical imaging device to provide optical draft measurement data; measuring the draft of the vessel using elevation data provided by at least one GNSS or GPS device so as to provide elevation draft measurement data; and using the elevation draft measurement data and the optical draft measurement data to determine the draft of the vessel.

A platform, system, method, and computer readable media is provided which is configured for monitoring water level height of one or more bodies of water. In a version the system generally comprises one or more of the following components: (a) a plurality of sensor nodes, each sensor node associated with a predetermined geographical location near water, wherein each sensor node comprises: (i) a detector configured to collect environmental data pertaining to changes in water surface height; and (ii) a telemetry module configured to wirelessly transmit the environmental data collected by the detector; (b) a gateway device configured to receive and route the environmental data, the gateway device comprising a gateway device processor and non-transitory computer readable storage media encoded with a computer program including instructions executable by the gateway device processor to create a gateway device application comprising: (i) a software module configured to receive the environmental data; (ii) a software module configured to apply an algorithm to the environmental data to parse, clean and aggregate environmental data; (iii) a software module configured to wirelessly transmit the environmental data; (c) a cloud based platform configured to support real-time stream processing of sensor node environmental data, the cloud based platform comprising one or more cloud based servers comprising a cloud server processor and non-transitory computer readable storage media encoded with a computer program including instructions executable by the cloud server processor to create a server application comprising: (i) a software module configured to receive the environmental data; (ii) a software module configured to apply an algorithm to the environmental data to determine an environmental trend or condition; (iii) a software module configured to generate an environmental data report comprising environmental trend or condition; and (iv) a software module configured to transmit the environmental data report when certain environmental data parameters exceed predefined thresholds in the form of an alert; and (d) a device comprising a report processor configured to provide a report application comprising a software module configured to receive and display the environmental date report.

A flood prediction system for predicting a flood depth of a flood prediction location on land that will be flooded by waves includes a prediction formula generator to select, based on maximum wave heights of the waves at observation positions on water and a flood depth of each land-based area that will be flooded by the waves, at least one of the observation positions in order to predict the flood depth of the flood prediction location within a land-based area and to generate a prediction formula for predicting the flood depth of the flood prediction location, and a flood depth predictor to acquire, from a sensor, a maximum wave height measurement value of the observation position selected by the prediction formula generator and to predict the flood depth of the flood prediction location by using the prediction formula.