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COPERNICUS MARINE ENVIRONMENT MONITORING SERVICE COPERNICUS Marine Environment Monitoring Service Viewer User Guide Reference: CMEMS-CIS-UM-VIEW Validated by: R. de Dianous Document release number: 1.1 Date: 11 May 2016 Contributors : T. Tan

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  • COPERNICUS MARINE ENVIRONMENT MONITORING SERVICE

    COPERNICUS Marine Environment Monitoring Service

    Viewer User Guide

    Reference: CMEMS-CIS-UM-VIEW

    Validated by: R. de Dianous Document release number: 1.1 Date: 11 May 2016

    Contributors : T. Tan

  • CMEMS-CIS Copernicus Marine Service

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    CHANGE RECORD

    Issue Date § Description of Change Author

    1.0 20 Nov 15 All First version of document T. Tan (CLS) R. de Dianous (CLS)

    1.1 11 May16 III.3 Update of document T. Tan (CLS)

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    TABLE OF CONTENTS

    I Introduction ...................................................................................................................................................... 5

    II Basic Data Viewing .......................................................................................................................................... 6

    II.1 Selecting product(s) ...................................................................................................................................... 6

    II.2 Getting product information ....................................................................................................................... 6

    II.3 Selecting a different dataset and variable ................................................................................................... 7

    II.4 Selecting time and depth .............................................................................................................................. 8

    III Advanced Data Viewing ............................................................................................................................... 9

    III.1 Changing the data style .............................................................................................................................. 9 III.1.1 Changing the colour palette .............................................................................................................. 9 III.1.2 Changing the scale ........................................................................................................................... 11

    III.2 Exploring the data further ....................................................................................................................... 13 III.2.1 Moving around the map .................................................................................................................. 13 III.2.2 Getting detailed information about a point ................................................................................... 14 III.2.3 Plotting a transect ............................................................................................................................ 15 III.2.4 Changing the background map and the projection ...................................................................... 15 III.2.5 Animating your data ........................................................................................................................ 16

    III.3 Sharing your data...................................................................................................................................... 16

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    LIST OF FIGURES

    FIGURE 1: VIEWER GENERAL INTERFACE ........................................................................................ 5

    FIGURE 2: PRODUCT/DATASET DETAILS .......................................................................................... 6

    FIGURE 3: DATASET SELECTION ........................................................................................................ 7

    FIGURE 4: VARIABLE SELECTION ....................................................................................................... 7

    FIGURE 5: TIME AND DEPTH SELECTION .......................................................................................... 8

    FIGURE 6: COLOUR PALETTE.............................................................................................................. 9

    FIGURE 7: NUMBER OF BANDS FOR COLOUR PALETTE ............................................................... 10

    FIGURE 8: BOXFILL FEATURE ........................................................................................................... 10

    FIGURE 9: OPACITY OF LAYER ......................................................................................................... 11

    FIGURE 10: COLOUR PALETTE - SCALE SELECTION ..................................................................... 11

    FIGURE 11: COLOUR PALETTE - SCALE ADJUSTMENT ................................................................. 12

    FIGURE 12: COLOUR PALETTE – AUTO ADJUST SCALE ............................................................... 12

    FIGURE 13: COLOUR PALETTE - SCALE TYPE SELECTION .......................................................... 13

    FIGURE 14: COLOUR PALETTE - SCALE LOCK................................................................................ 13

    FIGURE 15: EXPLORING THE MAP (MOVE, ZOOM...) ...................................................................... 14

    FIGURE 16: DETAILED INFORMATIONS ............................................................................................ 14

    FIGURE 17: PLOTTING TRANSECT ................................................................................................... 15

    FIGURE 18: SELECT BACKGROUND MAP AND PROJECTION ....................................................... 15

    FIGURE 19: ANIMATIONS.................................................................................................................... 16

    FIGURE 20: SHARE PLOTS ................................................................................................................. 16

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    I INTRODUCTION

    The Copernicus Marine Environment Monitoring Service (CMEMS) Viewer is the entry point for visualising oceanographic data. It is directly linked to the catalogue website. This user guide explains the main features of the Viewer and explains how to use them. The following images show example screens when using the Viewer:

    Figure 1: Viewer general interface

    CMEMS Viewer is based on Godiva2 web client implemented by University of Reading. You can find more information regarding the Godiva2 web client and ncWMS on Reading e-Science Centre Wiki

    http://www.resc.rdg.ac.uk/trac/ncWMS/wiki/GodivaTwoUserGuide

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    II BASIC DATA VIEWING

    II.1 Selecting product(s)

    Currently, product selection is only available through the CMEMS catalogue. To select a product click on “ONLINE CATALOGUE” of the CMEMS main page. Select your desired product from the catalogue and click on “MORE INFO”. Then click on the “VIEW PRODUCT” button of the product. This will return you to the Viewer of your product selected.

    To return to the catalogue and select another product, click on the “BACK TO SEARCH" button. It returns on your previous searching. Then select another product and proceed as define at the bottom, to view the product selected.

    The list of all the products selected is created on the left side of the windows, in “MY CART” section.

    II.2 Getting product information

    Clicking on the product information button will bring up a window containing information about the product. The exact information shown will vary from provider to provider, but typical information includes data provenance, relevant copyright information, accuracy, etc.

    Figure 2: Product/dataset details

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    II.3 Selecting a different dataset and variable

    Clicking on the dropdown list titled “Dataset" will reveal the available datasets to view in the current product:

    Figure 3: Dataset selection

    Clicking the button titled “Variable" will bring up a list of available variables to plot. Clicking a variable name will plot it in the main window:

    Figure 4: Variable selection

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    II.4 Selecting time and depth

    If a variable has a time or a depth axis associated with it, the Time and Depth/Elevation selectors will become available. These are simple drop-down lists. Note that the date and time are selected separately and the available times may depend on the selected date.

    Figure 5: Time and Depth selection

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    III ADVANCED DATA VIEWING

    III.1 Changing the data style

    III.1.1 Changing the colour palette

    To change the colour palette used to plot the data, click (only one click) on the main colour bar. This will bring up a dialog box which allows further refinement of the palette settings. This is shown in figure, below:

    Figure 6: Colour palette

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    A colour palette can be chosen by simply clicking on the desired colour bar.

    However, it should be noted that if a different number of colour bands is required, this should be chosen prior to selection of the palette.

    Click the close button to cancel palette selection.

    Figure 7: Number of bands for colour palette

    The data layer can be represented by boxfill or contour way. Boxfill option selected will show all the color of the graph cells. “Contour” option shows the color lines level.

    Figure 8: Boxfill feature

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    The opacity of the data layer can be changed by using the opacity selection box and choosing the desired option. Note that changing the opacity does not require communication with the data server and so this is a near-instantaneous operation.

    Figure 9: Opacity of Layer

    III.1.2 Changing the scale

    To adjust the upper and lower limits of the scale, new values can be entered into the scale limits boxes. Once entered, a new value can be accepted by either pressing the return key, or by clicking outside the box.

    Figure 10: Colour palette - scale selection

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    Figure 11: Colour palette - scale adjustment

    The scale limits can also be automatically adjusted by clicking the auto-palette button.

    Figure 12: Colour palette – auto adjust scale

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    The scaling can be set to linear (default) or logarithmic scaling by selecting the appropriate option from the drop-down box. Note that logarithmic scaling cannot be selected if either of the scale limits ≤ 0.

    Figure 13: Colour palette - scale type selection

    By clicking the lock scale button, the scale will become locked. This means that if you change to a different variable, the same scale will be used. This will also disable the scale entry boxes, the auto-scale button, and the linear/logarithmic selector. Click again to unlock.

    Figure 14: Colour palette - scale lock

    III.2 Exploring the data further

    III.2.1 Moving around the map

    To move around the map there are several options. The movement and zoom buttons on the navigational panel can be clicked to move. If the hand tool is selected (it is selected by default and this is indicated by an orange background) clicking the mouse and dragging will move around the map, and adjusting the scroll wheel will zoom in and out. Additionally, if the shift key is held down, a rectangle can be drawn on the screen by clicking and dragging. This will cause the map to zoom to the specified rectangle. Note that the map has a number of preset zoom levels, and so may not zoom to precisely fit the drawn rectangle.

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    Figure 15: Exploring the map (move, zoom...)

    III.2.2 Getting detailed information about a point

    With the hand tool selected, clicking on a data field will bring up further information about the data. This will include the precise location of the click, and where this corresponds to in the data (i.e. the nearest point with data), and of course the value of the field at that point. If appropriate this will also include links to time series or vertical profile plots. Clicking these links will allow the user to view a plot. In the case of a time series plot, the user will first be prompted to enter a time range. By default this range will cover the entire span of the data.

    Figure 16: Detailed informations

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    III.2.3 Plotting a transect

    To plot a transect of the data field currently being viewed, first select the transect tool. By clicking points on the map, a transect line can be drawn. To end the line, double-click the final point. This will cause a transect plot to be displayed over the map.

    Figure 17: Plotting Transect

    III.2.4 Changing the background map and the projection

    The background layer selection menu can be accessed by clicking the “+" button. This allows the user to select a different background map. By selecting a background map with a different projection (e.g. North Polar Stereographic), all data will be reprojected and plotted.

    Figure 18: Select background map and projection

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    III.2.5 Animating your data

    By clicking the animation button, a dialog box will appear allowing the user to specify the time range, number of frames, and frame rate for an animation. It should be noted that the selected palette and scale range will be used for each frame of the animation, so please ensure that the range is wide enough to plot all data within the time period. Animation generation can be very slow, and the speed will depend on both the amount of data needed, and the speed of the server which hosts the data.

    Figure 19: Animations

    III.3 Sharing your data

    Below the map there are several links which will facilitate the sharing of data. “Open in Google Earth" downloads a KML file which can be downloaded and used to view the data in Google Earth. KML is a standard format which can be shared with users of Google Earth. The “Permalink" provides a hyperlink which can be used to return to the current state of the data (i.e. dataset, variable, palette, zoom, etc.). This hyperlink is located in the URL Bar.

    The “Export to PNG" link provides a downloadable PNG image with a plot of the data. This image contains the plot alongside all the pertinent information about it in a compact layout which can be included in publications (this is subject to any copyright restrictions on the data). To save the map on your hard drive, all you have to do is a right click and then select “Save picture as…” from the contextual menu.

    Figure 20: Share plots

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    End of document