A basemap provides geospatial context for the datasets that you work with. The basemap that the Data Inspector Library uses is derived from the HERE Optimized Map for Visualization (OMV) catalog. And the data for OMV is based on the HERE Map Content Data (HMC) catalog. This kinship ensures that the basemap is always fresh (weekly updates), accurate, and compatible with other types of data stored on the HERE platform.

OMV has been specifically adapted for performant web-based visualizations through simplifying geometries and filtering data. OMV follows the Mapbox Vector Tiles (MVT) specification – an industry standard for map vector tiles.

Basemap Sources

Depending on your region, you may need to use a different OMV catalog as the basemap source. Or you may want to use your custom OMV catalogs for your specific needs.

The Data Inspector allows you to select among those basemap sources to which you have access. For this, in the Data Inspector, go to the Control Panel, expand the Basemap section, and choose the OMV catalog you need. The Data Inspector remembers your last choice.

Basemap Source Switcher
Figure 1. Basemap Source Switcher

Dependency Resolution between Basemap Sources and Visualized Data

The default basemap for the Data Inspector is ruled by the dependencies of a layer to be visualized. For example, if your dataset is dependent on the HMC Japan catalog, then the OMV for Japan is automatically selected and shown. If no matches are found, or if you have no access to OMV Japan, then the default OMV RoW (rest of the world) catalog is displayed. Also, if you select another basemap with the Basemap Switcher, your choice is retained for the next sessions for the same catalog.

For more information on how to set layer dependencies, see the CLI Developer Guide.

You can disable this option in your custom visualizations by setting the enableBaseMapAutoSelection setting in the DataInspector configuration to false.

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