Map View Layers
User Guide GeoDMS GUI - map view layers
A map view consists of one or multiple layers, with coordinates expressed in the same coordinate system.
In the GeoDMS a distinction can be made in the following layer types:
Layers use to present data related to a geographic domain. Such a domain can be visualised in a map view with grid cells (for grid domains), polygons, arcs or points (for one-dimensional domains) as in the following example:
examples of data layers with grid, polygons, arcs and points data
In these layers, the grid cell, polygons, arcs and/or points are visualized with one or multiple visualization styles (colors, symbols, size etc.). The possible styles are dependent on the layer type.
The following data layers can be distinguished:
geographic layers: Feature attributes of one dimensional domains can be directly drawn in a mapview, with a default or preconfigured visualisation style.
- Numeric data items often need to be classified to be visualized as layer. Classification schemes can be configured, or a default scheme is made when the data is requested in a map view.
2.String data items A specific type of a data layer is the label layer. Text labels can be used for polygon and point layers, see example:
examples of label data layers for polygon and point data
A background layer is visualized automatically when a view for the coordinate system for which this layer is configured is created. The background layer is used as a reference and is usually a WMTS layer.
Each map view has one active layer, shown in the title of the map view. The active layer is the layer on which the layer-specific (toolbar) functions are executed. A layer can be activated from the legend. In this legend the active layer is indicated by a blue background color in the title as in the figure.
The user can switch between active layers by clicking on the layer title. By default, the last layer added to the map view becomes the active layer.
