Marine technology

BS ISO 21851:2020 pdf free.Marine technology — Ocean observation systems — Design criteria of ocean hydro-meteorological observation systems reuse and interaction.
6.3 Instrument status display
It shall be possible to visually display the real-time status of the instrument, i.e. whether each
instrument is functioning properly.
6.4 Data display
The data of hydrology-meteorological parameters, such as salinity, wave period, wave height, temperature, water level, current speed, flow direction, flow rate, wind speed, wind direction, humidity, air pressure and rainfall shall be displayed in real time in a list. Detailed functional specifications shall be as follows.
1. It can display one or more parameter data in real time.
2. The list can be sorted by ascending/descending order of parameter initials and ascending! descending order of para meter values.
3. It can display or hide one or more parameter data in the list, according to the parameter name.
6.5 Graphic display
The graphic display shall provide the corresponding hydro-meteorological data In real time, in the form of a line chart, a vertical profile (optional), a vertical section (optional) and a temperature-salinity characteristic diagram (optional).
1. Linear chart
The data of temperature. wave period, wave height, water level, precipitation, barometric pressure, salinity, humidity and other parameters are displayed by linear chart. Detailed functional specifications shall be as follows.
1) It can display one or more parameter data in real time.
2) After selecting any point on the line chart, it can display the parameter name of the point and the corresponding detailed parameter data of the point, and the data annotation function is provided.
3) It is possible to display global and local information by shrinking, zooming in and dragging, and one or more parameter data can be displayed or hidden according to the parameter name.
2. Vertical profile (optional)
The change in temperature or salinity with depth or time is displayed by vertical profile, as well as the variation of wind speed or air pressure with height or time. Detailed function specifications should be as follows.
1) The temperature or salinity parameter data can be displayed in real time.
2) After selecting any point on the vertical profile, the parameter name of the point and the detailed parameter data corresponding to the point can be displayed and the data annotation function is provided.
3) It is possible to display global and local information by shrinking, zooming in and dragging.
3. Vertical section (optional)
The physical distribution of temperature or salinity varying with longitude, latitude or depth and the distribution of pressure isobars varying with longitude, latitude or height are shown in the form of vertical profiles. Detailed functional specifications should be as follows.
1) It can display temperature, salinity or barometric parameter data in real time.
2) After selecting any point on the vertical section, the parameter name of the point and the detailed parameter data corresponding to the point can be displayed and the data labelling function is provided.
3) It is possible to display global and local information by shrinking, zooming in and dragging, and to display or hide temperature or salinity parameter data according to the parameter name.
4. Temperature-salinity characteristic diagram (optional)
The relationship between temperature and salinity parameters is shown in the form of temperature-salinity charts. Detailed functional specifications should be as follows.
1) The temperature and salinity parameter data can be displayed in real time.
2) After selecting any point on the temperature-salinity characteristic diagram, it can display the parameter name of the point and the corresponding detailed parameter data of the point, and the data labelling function is provided.
3) It is possible to display global and local information by shrinking, zooming in and dragging.
6.6 Comprehensive query
The lunction module shall be able to query hydro-meteorological parameter data and to display the query results in the form of a list, linear chart, vertical profile (optional), vertical section (optional) and temperature-salinity characteristic diagram (optional). Lists, linear charts, vertical profiles, vertical sections, and temperature-salinity characteristic diagrams shall have the following functions in addition to the functions required for the data display and graphic display sections.
1. List
It can query and display the data with the specified time range as the query condition.
2. Linear chart
It can query and display the data under the query condition by specifying certain parameters or specifying the time range as the query condition.
3. Vertical profile (optional)
It can query and display the data under the query condition by the specified depth range, or the specified time range as the query condition.
4. Vertical section (optional)
It can query and display the data under the query condition by the specified depth range, the specified latitude and longitude range, or the specified time range as the query condition.
5. Temperature-salinity characteristic diagram (optional)
It can query and display the data under the query condition with the specified time range as the query condition.
6.7 Statistic analysis
The function module shall be able to conduct a mathematical analysis of salinity, wave period, wave height, wave direction, temperature, water level, current speed, flow direction, wind speed, wind direction, humidity, pressure, and precipitation, i.e. to calculate the average value, variance, standard deviation, period, and maximum and minimum, as well as daily cumulative, monthly cumulative or annual cumulative values of the above parameter data. Detailed functional specifications shall be as follows.
1. One or more parameters of any Ol-IM-CVI can be selected, and the parameters are mathematically analyzed from the spatial category.
2. One or more parameters in any time period or curve segment can be selected, and the parameters are mathematically analyzed from the time category.
3. The function module can set the average, variance, standard deviation, period, maximum and minimum values, and daily cumulant, monthly cumulant or annual cumulant thresholds, and can provide an early warning when values greater than or less than the thresholds prompt.
The calculation analysis results shall be displayed in four forms: list, linear chart, histogram, and rose diagram. The list and linear chart shall meet the functional requirements of data display (4), graphic display (), and comprehensive query (). The detailed functional specifications of the histogram and rose diagram shall be as follows.
a. Histogram
Display of the daily precipitation, monthly precipitation, and water flow statistics in the form of a histogram. The detailed functional specifications shall be as follows.
1) After selecting any point on the histogram, the parameter name of the point and the detailed parameter data corresponding to the point can be displayed, and the data labelling function is provided.
2) It is possible to display global and local information by shrinking, zooming in and dragging, and can display or hide one or more parameter data according to parameter names.
3) It can query, calculate and display the data under the query condition by specifying certain parameters or specifying the time range as the query condition.
b. Rose diagram
The statistical results of average wind speed, wind direction frequency, current speed and flow direction frequency are displayed in the form of a rose graph. The detailed functional specifications shall be as follows.
1) After selecting any point on the rose diagram, the parameter name of the point and the detailed parameter data corresponding to the point can be displayed, and the data labelling function is provided.
2) It is possible to display global and local information by shrinking, zooming in and dragging.BS ISO 21851 pdf download.Marine technology