|MapGazer – Using transparency|
MapGazer windows have a base map, which is the primary map for that window. Four types of information can be overlaid on the base map:
All four overlay types can have their transparency varied interactively by moving sliders in the Transparencies dialog. To open this, select the Map → Map transparencies menu item (also available from the map pop-up menu), or press the ‘t’ key. The four settings are independent and apply to all views, and are saved when MapGazer is closed.
You can also change the transparency of the overlay map directly by pressing the ‘+’ or ‘-’ keys (which increase or decrease the transparency of the overlay map in 5% intervals).
The slider arrows also change transparencies at 5% intervals. Press Reset to reset all transparency settings to their default values.
To overlay a second map over the base map, select the Map → Add overlay map menu item. You can then vary its transparency using the Overlay map slider in Map → Map transparencies dialog, as described above. Overlaying maps lets you see (for example) how geological information relates to topographic, or see street map information along with topography.
You can try this for yourself by using the provided SampleMap as the base map and then adding the SampleGeology map as the overlay map.
An active overlay map can be changed using Map → Change overlay map or removed using Map → Remove overlay map. The overlay map options are also available from the map pop-up menu.
Please click here for an animation (13MB) of varying the transparency of a geological map overlaid over a topographical map. Below are two ‘stills’ from that animation.
|MapGazer and these web pages were written by Mike Cowlishaw; Please send me any corrections, suggestions, etc.|
All content © Mike Cowlishaw, 2014–2017,
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This page was last updated on 2017-01-13 by mfc.