The tool allows one to merge multiple grids into one single grid. This involves resampling if the input grids have different cell sizes or are not aligned to each other. Besides different resampling methods, the tool provides several options on how to handle overlapping areas. It is also possible to apply a histogram matching.
In order to be able to also merge a large amount of grids, which, for example, would exceed the maximum command line length, the tools has the option to provide a file list as input (instead of using the input grid list). This is a text file with the full path to an input grid on each line. Please note the limitiations: (i) the target grid system is set automatically in this case (the extent is calculated from all inputs and the cell size is set to the smallest one detected) and (ii) the input grids must still fit into memory, i.e. are all loaded at once.
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Grids (*) | Grid list (optional input) | GRIDS | - | - |
| Target System (*) | Grid (optional input) | TARGET_TEMPLATE | use this grid's system for output grids | - |
| Output | Target Grid | Grid (output) | TARGET_OUT_GRID | - | - |
| Options | Input File List | File path | FILE_LIST | A text file with the full path to an input grid on each line | - |
| Name | Text | NAME | - | Default: Mosaic |
| Data Storage Type | Choice | TYPE | - | Available Choices:
[0] 1 bit
[1] 1 byte unsigned integer
[2] 1 byte signed integer
[3] 2 byte unsigned integer
[4] 2 byte signed integer
[5] 4 byte unsigned integer
[6] 4 byte signed integer
[7] 4 byte floating point
[8] 8 byte floating point
[9] same as first grid in list
Default: 9 |
| Resampling | Choice | RESAMPLING | - | Available Choices:
[0] Nearest Neighbour
[1] Bilinear Interpolation
[2] Bicubic Spline Interpolation
[3] B-Spline Interpolation
Default: 3 |
| Overlapping Areas | Choice | OVERLAP | - | Available Choices:
[0] first
[1] last
[2] minimum
[3] maximum
[4] mean
[5] blend boundary
[6] feathering
Default: 1 |
| Blending Distance | Floating point | BLEND_DIST | blending distance given in map units | Minimum: 0.000000
Default: 10.000000 |
| Blending Boundary | Choice | BLEND_BND | blending boundary for distance calculation | Available Choices:
[0] valid data cells
[1] grid boundaries
[2] vertical grid boundaries
[3] horizontal grid boundaries
Default: 0 |
| Match | Choice | MATCH | - | Available Choices:
[0] none
[1] match histogram of first grid in list
[2] match histogram of overlapping area
[3] regression
Default: 0 |
| Target Grid System | Choice | TARGET_DEFINITION | - | Available Choices:
[0] user defined
[1] grid or grid system
Default: 0 |
| Cellsize | Floating point | TARGET_USER_SIZE | - | Minimum: 0.000000
Default: 1.000000 |
| West | Floating point | TARGET_USER_XMIN | - | Default: 0.000000 |
| East | Floating point | TARGET_USER_XMAX | - | Default: 100.000000 |
| South | Floating point | TARGET_USER_YMIN | - | Default: 0.000000 |
| North | Floating point | TARGET_USER_YMAX | - | Default: 100.000000 |
| Columns | Integer | TARGET_USER_COLS | Number of cells in East-West direction. | Minimum: 1
Default: 100 |
| Rows | Integer | TARGET_USER_ROWS | Number of cells in North-South direction. | Minimum: 1
Default: 100 |
| Fit | Choice | TARGET_USER_FITS | - | Available Choices:
[0] nodes
[1] cells
Default: 0 |
| Grid System | Grid system | TARGET_SYSTEM | - | - |
| (*) optional |