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Ernst de Vreede, 06/16/2015 08:07 AM


Configuration of rendering point data

The Point element is defines the rendering of point data. A Layer with point data can contain one or more NetCDF variables (Variable elements). If there are exactly two Variable elements the layer is assumed to contain wind speed and direction (see Vector).
There are many rendering possibilities for point data.

The pointstyle attribute defines the style of point rendering and can have one of the values "point", "disc", "volume" or "symbol".
Point data can be rendered:
  • as a text on the map on or around the station's location (single and multiple Variables) "point"
  • as text on a coloured disc (one Variable): "disc"
  • as a kind of fuzzy cloud: "volume"
  • as a symbol determined by the point value and a set of SymbolInterval definitions: "symbol"

The plotstationid attribute defines if the stationid is plotted together with the data.

Appearance of a text is determined by the textcolor, fontfile and fontsize attributes. The value is formatted by the printf-style format string of the textformat attribute.

Pointstyle point

This pointstyle draws a circle at the station location, coloured according to it's value and the Legend. The value can be plotted next to the point. When more than 2 Variables are defined in a layer, the values get plotted in a circle around the station's location. The values are plotted starting at the angle defined by the anglestart attribute and are anglestep degrees apart. The distance of the text from the station's location is defined by the textradius attribute.

Single variable layer example:
Multiple variable layer example:

If discradius is defined to be larger than 0 a circle is drawn at the station's location in a color determined by the data value and the Style's Legend.If discradius is 0 then the data's value is plotted centered at the station's location.
The attribute linecolor specifies a color for the edge of the circle. Making the linecolor transparent (linecolor="0x00000000") draws no line around the circle.

The attribute dot plots a dot at the station's location; this is mostly useful during configuration of a point data style.

Pointstyle disc

Pointstyle disc can only handle 1 variable in a layer or 2 in case of wind data.
The attribute discradius defines the size of the disc on which the value text is drawn, fillcolor defines the color of the disc (this color can contain transparency).

The attributes anglestart, anglestep, linecolor, plotstationid and textradius have no meaning here.

Pointstyle volume

Pointstyle volume shows a fuzzy disc at the station's location. This style is most useful for events that can occur often and overlap (because the rendered discs are translucent).
The base color of the disc is defined by the fillcolor attribute.
A station id is plotted if the plotstationid attribute has the value true.

The attributes anglestart, anglestep, linecolor and textradius have no meaning here.

point1.png View (13.9 KB) Ernst de Vreede, 06/16/2015 08:02 AM

point3.png View (16.4 KB) Ernst de Vreede, 06/16/2015 08:02 AM

barb.png View (11.3 KB) Ernst de Vreede, 06/16/2015 08:02 AM

barbdisc.png View (14.8 KB) Ernst de Vreede, 06/16/2015 08:02 AM

barbvector.png View (13.4 KB) Ernst de Vreede, 06/16/2015 08:02 AM

disc.png View (14.7 KB) Ernst de Vreede, 06/16/2015 08:14 AM

volume.png View (15.5 KB) Ernst de Vreede, 06/16/2015 08:14 AM

iasi_adaguc.png View (807 KB) Maarten Plieger, 03/01/2019 11:24 AM

pointstyle_radiusandvalue.png View (564 KB) Maarten Plieger, 03/18/2022 10:30 AM