!Composite driver
The composite driver is a pseudo-driver that lets you group multiple image-producing sources into one logical layer.
Specs
- Profile: This driver takes its profile from the first component layer it finds. Or, you can explicitly set a profile to use. (Note: See the Limitations section below for restrictions on profiles.)
Options
none.
Limitations
There are some limitations on use of the composite pseudo-driver.
- Like Profiles Only: This driver does not perform any mosaicing or reprojection. Therefore, you can only composite layers with like profiles.
- Caching: Caching only occurs at the layer level. The composited layer can be cached, but individual components cannot.
- Image Processing: Only the following <image> layer features work when compositing: opacity, transparent_color, and no_data_image.
Example
<image name="grouped layer" driver="composite">
<image name="component 1" driver="tms">
...
</image>
<image name="component 2" driver="wms">
...
</image>
...
</image>
