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These are special shapes where all the vertices defined by a keep their lat-lon position as the projection changes and the edges between them are sampled linearly in the lat-lon space. It means that in cylindrical projection the edges are always straight lines, while in other projections they might be curves. The following table shows how a fitted geo-shape changes as the projection changes from cylindrical to polar north:
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In these shapes all the vertices are defined by a keep their lat-lon position positions as the projection changes and they are always connected with a straight line (or with a B-Spline for curves) in all the projections.
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| Object | Cylindrical | Polar North |
|---|---|---|
| Geo rectangle |
|
|
Surface analyisis
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Markers and text
For these objects only the centre keeps its lat-lon position as the projection changes, while the extent is defined in terms of pixels.
Surface analysis
This is a collection of curves standard meteorological curves and symbols.
WMO symbols
All the WMO weather symbols are available here. They behave like markers, i.e. their centre is keeping its lat-lon position when the projection changes and extent is defined in pixels.
Can I add my own symbols?
You can use any square shaped SVG or PNG file as a symbol. These have to be added to the System/Symbols folder in your Metview home directory. When you start a uPlot window it scans this directory and add all the files with .*svg or *.png suffix to the Markers and text group in the Symbols sidebar.
How can I edit the symbols?
Single click on the symbol: it gets into edit mode where you can move and resize it and edit its graphical properties from the ribbon editor at the top of the view area.
Is redo-undo available?
It is not yet available.
How
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to generate a PNG or PDF from the scene?
Just use the Export button in toolbar and choose between the PDF_QT or the PNG_QT output formats.
How can I save the edited objects for later reuse?
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