### Mosaic

The Mosaic operation is used to create a mosaic from a set of rasters. Image mosaic refer to that multi images, which are shot in the same or different shooting condition and have overlapped regions, are stitched and combined to a image to enlarge the field of vision that a image can cover. The available methods in TerraLib are:

- Geo Mosaic: Create a mosaic from a set of geo-referenced rasters.

- Tie Points Mosaic: Create a mosaic from a set of rasters using tie-points over each adjacent rasters pair.

- Sequence Mosaic: Create mosaics from a sequence of overlapped rasters using an automatic tie-points detection method.

It is accessible through:
Raster Processing > Mosaic... (list of all raster layers will be available)
This wizard consists of the following steps:

#### Wizard Page 1 - Selection of the layers to mosaic (Layer Search)

1. On the List of Layers select the raster layers to apply the mosaic.
2. Optionally use Filter By Name field giving part of the layer name to help find the layer in the list.
3. Press Next to go to next step or Cancel to close the dialog.

#### Wizard Page 2 - Mosaic parameters

1. Select the Type of mosaic to be used and set their specific parameters.

- Geo Mosaic
- Tie Points Mosaic

- Layer A
- Layer B
- Geometric transformation
- Tie Points Link Type
- Use tool to show the interface for the acquisition of tie points. This interface is the same used in the register operation.

- Sequence Mosaic

- Geometric Transformation
- Reference Band: The band used to locate tie-points.
- Minimum Required Tie Points: The minimum required tie-points covered area percent of each raster area - valid range [0,100] (default : 0).

2. The common parameters are:

- Interpolator: The raster interpolator method.
- Blender: The pixel blending method.
- No Data:

- Value: The pixel value used where no raster data is available (default : 0).
- Force Input Value: If checked, no data value will be used as the no-data value for input rasters.

- Options

- Auto Equalize: Auto equalization will be performed using the overlaped image areas.
- Use Raster Cache

3. Press Next to apply the contrast or Back to go to the previous wizard page.

#### Wizard Page 3 - Output information

1. Raster Info - First press and inform the folder where the resulting file will be saved.
2. Name - inform the raster name.
3. Extra Parameters - if there are some, see the details on how to inform then here.
4. Press Finish to save the resulting contrasted raster or Back to go to the previous wizard page.

Hint: The mosaic image will be added as a new layer at the TerraView project.