![]() ![]() the ib icon with your precipitation Contouring iconĬreate a new Legend icon and change Legend Display Type to Disjoint.the msl.grib icon with your MSLP Contouring icon.Visualise your Geographical View icon and drop the following icons into the Display Window: use the following list of colours: cyan, greenish_blue, blue, bluish_purple, magenta, orange, red, charcoal (use the Contour Shade Colour List helper tool).use the following list of levels for contouring: 0.5, 2, 4, 10, 25, 50, 100, 250 (but remember that in the Contouring icon editor to use a forward slash to separate the items).Plot the precipitation data using new Contouring icon.ĭo this in isolation from the MSLP field until you are happy with the result. ![]() The Contouring icon has a parameter called Grib Scaling of Derived Fields which should be set to On in this case. Here, the field is still precipitation, so we would like the normal scaling to be applied. ![]() Metview will normally automatically scale such parameters into their 'normal' units (in this case mm), but if a field is the result of some post-processing (as this one is) then this scaling will not be applied because the processing may have changed the nature of the field. GRIB files store their fields in SI units.įor precipitation this is metres, which is not what meteorologists tend to use. The GRIB file ib contains a pre-processed field of precipitation accumulated over 3 hours before and after the time of the MSLP field (a total of 6 hours of precipitation). Since this will be plotted on top of another field, it would also be a good idea to increase the thickness of the isolines.Īctivate the legend in the Contouring icon and set the legend text for this icon to "MSLP". Plot black isolines with an interval of 5 hPa between them. Plot the GRIB file msl.grib into this view using a new :ref:`Contouring ` icon. Plotting the Mean Sea Level Pressure field Set up a new :ref:`Coastlines ` icon with the following: With a new Geographical View icon, set up a cylindrical projection with its area defined by its lower-left corner and its upper-right corner. Remember to give your icons useful names! Then, at the end, we will put it all together into a macro. We will prepare the plot interactively using icons. We will also attach a marker to show a specific location on the map (New York City) and customise the legend and title.Ĭheck that the supplied data are as expected. In this exercise we will apply the basic Metview techniques to produce the plot shown above: a map showing part of North America with precipitation and mean sea level pressure fields plotted during the time of Hurricane Sandy. Case Study: Plotting Hurricane Sandy on a Map Case description ![]()
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