WMS Overlay: Difference between revisions
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[[File:WMS overlay.jpg|right|thumb|400px|A WMS Overlay, where image data from a Web Map Service is displayed.]] | [[File:WMS overlay.jpg|right|thumb|400px|A WMS Overlay, where image data from a Web Map Service is displayed.]] | ||
The WMS Overlay is a [[Grid overlay]] which can display an image result of a Web Map Service query of the project area. The | The WMS Overlay is a [[Grid overlay]] which can display an image result of a Web Map Service query of the project area. Because a Web Map service provides image data, this image data can be visualized as an [[Overlay]] in the [[3D World]]. | ||
The main intent of the WMS Overlay is to offer the ability to expose the color channels of the image data as rasterized data. Each color channel is available as a separate result type. This means the WMS Overlay allows the images to serve as [[prequel|input for other Overlays]] such as the [[Combo Overlay]]. | |||
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* When set to use the Color result type, the [[Overlay]]'s colors are not dictated by the [[Grid Overlay Legend]]. Instead, the actual color values are used. | * When set to use the Color result type, the [[Overlay]]'s colors are not dictated by the [[Grid Overlay Legend]]. Instead, the actual color values are used. | ||
* When [[recalculate|recalculating]], the WMS is queried for the latest version of the data. This occurs with each recalculation. | |||
|seealso= | |||
* [[Project Sources]] | |||
|howtos= | |howtos= | ||
* [[How to add and remove an Overlay]] | * [[How to add and remove an Overlay]] | ||
Revision as of 13:25, 19 January 2022
The WMS Overlay is a Grid overlay which can display an image result of a Web Map Service query of the project area. Because a Web Map service provides image data, this image data can be visualized as an Overlay in the 3D World.
The main intent of the WMS Overlay is to offer the ability to expose the color channels of the image data as rasterized data. Each color channel is available as a separate result type. This means the WMS Overlay allows the images to serve as input for other Overlays such as the Combo Overlay.
Additional information displayed in hover panel
When clicking on a specific location in the map of the WMS Overlay, the hover panel gives additional information on the color (channel) value in that specific grid cell, depending on the result type.
Result Types
The WMS Overlay allows the RGBA color channels of the image data to be accessed as separate grids of data.
| Name | Data | Value range |
|---|---|---|
| Red | Value of the red color channel | 0-255 (0 is no red, 255 is maximum red) |
| Green | Value of the green color channel | 0-255 (0 is no green, 255 is maximum green) |
| Blue | Value of the blue color channel | 0-255 (0 is no blue, 255 is maximum blue) |
| Alpha | Value of the opacity channel | 0-255 (0 is transparent, 255 is fully opaque) |
| Color | Composite value of all RGBA channels | n/a |
Notes
- When set to use the Color result type, the Overlay's colors are not dictated by the Grid Overlay Legend. Instead, the actual color values are used.
- When recalculating, the WMS is queried for the latest version of the data. This occurs with each recalculation.
How-to's
- How to add and remove an Overlay
- How to edit an overlay legend
- How to select a Web Map Service for a WMS Overlay
See also