Background layer

WMTS

Since version 7.163 the GeoDMS supports web mapping services (WMTS) as a background layer. See WMTS background layer for examples on how to configure such a WMTS webservice.

Using a WMTS background layer is advised for most projects, as it is scale dependent and limits the amount of data that needs to be shipped for a project. Images in png and jpeg format are supported.

Web mapping services work with fixed scale levels, while in the GeoDMS the user is free to choose the area of interest (and derived scale). With the pop-up menu option Zoom 1 Grid to 1 Pixel it is easy to select a scale level with an optimal rendering quality.

data items

If a coordinate system is used without WMTS services, it is also possible to configure data items as background layer.

The background layer usually consists of a (set of) reference layers, they can be scale dependent. In the legend of the map view they are combined to one entry called Background.

The background layerset is configured with the DialogData property for the unit for the coordinate system.

Example:

unit<fpoint> point_rd := baseunit('m', fpoint)
,  DialogData = "SourceData/reference/level_III/Amsterdam/map_bw;SourceData/reference/level_III/Utrecht/map_bw";

In the example two data items are configured as Background Layer. A semicolon(;) character is used as delimiter between the item names.