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ATtide installs easily onto any PC running a modern 64-bit version of Windows. It comes with sample files and a demonstration video to enable a quick and painless learning process. Every copy sold is fully customised to client requirements. The basic package comes with Bureau Analyse and Bureau Predict (the other functions come as options).

  • Home page

    As every version of ATtide is custom-designed for your local ports and special requirements, your version would look different (different functions, logo, photo or map, etc.) to the screengrabs below. Notice the buttons for each of the main functions.

    ATtide is designed to be as simple and intuitive as possible, while retaining all the power of a full tidal analysis package (as used by major bureaus around the world). It is also designed to reduce the errors to an absolute minimum.

    AT Home

  • Bureau-quality tidal analysis

    The results of a tidal analysis are shown in the panel below right. This required only a few clicks of the mouse.

    AT Analysis

    The software automatically extracts Mean Higher High Water, Mean High Water, Mean Low Water, Mean Lower Low Water, Range, HAT, and LAT. All these values, along with the plots and output files (with predictions and residuals), significance tests, etc., is stored on the user’s hard drive. The values and filenames are shown in a dialog box below the plots.

  • Bureau-quality tidal predictions

    The prediction below required only the entry of an Amplitude/Phase file, a time, and a few time-related fields. Along with the predictions, the daily high and lows are automatically computed. The predictions (times and heights) and time series plots are stored to disk.


  • Sea level map from local tide gauge data

    From harmonics based on data from a set of tide gauges along the coast, ATtide does an interpolation out to about 20 km offshore (and up a canal in this case). Additional clicks of the “Interpolate” button advances time, so the tide can be seen to advance along the coast.


  • Tidal characteristics map from satellite altimeter-derived data

    ATtide contains harmonics from a global tidal model (based on satellite altimetry data). It uses these harmonics to create plots of a region (the particular region in this case was built-in at the request of the customer). The predictions from the same harmonics, for a specific site, and for a chosen one-month interval, are plotted below. This is a handy way to learn about the larger-scale features of the tide in the area.


  • Hydrographic tools

    This function gives a high-quality tidal prediction for a specified position and time. The position can be specified by any one of four ways:

    1. by clicking on a map (geotiff) 2. by importing from a connected GPS 3. by reading from a pre-existing NMEA file 4. by manually entering coordinates.

    The tidal harmonics can be read from a file based on local tide gauges or tidal model.

    In the results below, the map was clicked on (after zooming in), and the current time (from the PC clock) was used. Simple as that.


  • Data QA/QC

    The Data QA/QC takes the raw data from the tide gauge, and allows the user to quickly and easily eliminate spikes and gaps (of defined size), either automatically or manually.

    In the screengrab below, the software has automatically found the spikes (red dots), and the gap (green dot at each end) of a blue line). The “clean” data is shown as a black line below.

    AT Data QA QC

  • ROMSview

    ROMSview creates plots from the output files from the Regional Ocean Modelling System (ROMS). The plots can be of any of the ROMS variables (e.g. temperature), or velocity. The map view shown in the screengrab can be zoomed in by dragging a rubber band box (one such rectangle is shown). ROMSview creates animations from either the maps, or from a “time series” view of the selected variables. The time series can be from one of the pre-selected positions (in this case two are shown at the locations of current meters), or from any point in the model domain.

    ROMSview makes it easy to draw a “transect”, (or “curtain”) view of the 3D data along a line selected by clicking on two or more points.

    The slider bar along the bottom changes the displayed time forward or back.For the time series or animation, a subinterval (or single point) of the total time can be selected using the slider.

    Additional functions, such as statistical computations or other forms of plots can be added upon request.

    AT ROMSview