Page History

...

The Magnifier button in the toolbar toggles the magnifier tool on and off. Unlike Zoom, this is a purely graphical enlargement of the plot. It is usedmainly to inspect small text such as contour labels. The magnifying glass can be moved and resized using the mouse, and the magnification scale on its left-hand side can also be adjusted.

Image Modified

Animation Steps

...

Use the Zoom tools to enlarge the European area and use the Area tool to select a region over Europe. Click Ok to save your selection - your choices will now be updated in the Geographic View editor. Click Apply in the Geographical View editor to save everything. Plot your data in this view to confirm that the area and projection are as desired.

Image Added

Linking the Coastlines icon with the Geographic View Icon

...

Create a new Macro icon and edit it. This time we see a code editor, custom-built for the Macro language. The editor can automatically translate Metview icons into Macro code, so do the following:

• drop the t1000.grb icon into the Macro Editor; a variable called

  XXX

  t1000_2e_grb is assigned to the value of the read() command, which reads the GRIB data

• rename the variable to simply t1000
• drop your polar_europe icon into the Macro Editor
• drop your Coastlines icon into the Macro Editor
• underneath the generated code, type the following line:

plot(polar_europe, coastlines, t1000)

This says, "In the polar_europe view, using the coastlines definition, plot data t1000".

Your complete macro should look like this:

# Metview Macro

t1000 = read("/path/to/user/metview/t1000.grb")

polar_europe = geoview(
    map_projection      : "polar_stereographic",
    map_area_definition : "corners",
    area                : [30,-25,50,65]
    )

coastlines = mcoast(
    map_coastline_thickness         : 2,
    map_coastline_land_shade        : "on",
    map_coastline_land_shade_colour : "cream"
    )

plot(polar_europe, coastlines, t1000)XXXX

Now run the macro to generate the plot.

...

Future versions of Metview will incorporate more advanced plot-editing facilities available directly from the Layers tab. You can close the Display Window again.

XXX

Modifying the Contouring

XXXImage Added

Metview provides many ways to style the contours when plotting data. These are controlled via the Contouring icon. Create a new instance of this icon and rename it to shade. Edit it, setting the following parameters:

Image Added

Apply the changes, visualise the data icon again (t1000.grb) and drag the shade icon into the Display Window.

Image Removed

Our palette is automatically generated from a colour wheel. Try setting Contour Shade Colour Direction to Anti Clockwise to see the difference in the generated palette.

Image Added

Creating a Legend

Create a legend by changing the first parameter in the Contour editor and dragging the icon into the Display Window again:

...

...

plot(polar_europe, coastlines, t1000, fixed_t)

Visual definition variables must appear just after the data variables to which they are to be applied. In fact, now that we have a shaded field covering the whole globe, there is no need to shade the land; we can remove coastlines from the plot() command. We will still see the coastlines, but Metview will use the default coastline definition, which is to draw the outline without shading the sea or the land.

Modifying a Default Icon

...