The Densify operation allows you to reduce the pixel size of a map.
The user is asked to enter an enlargement factor which determines the number of rows and columns in the output map. For example, when using an enlargement factor of 2.5 on an input map consisting of 400 lines and 400 columns (e.g. pixel size of 25m); the output map will contain 1000 lines by 1000 columns (resulting in a pixel size of 10m).
Thus the number of rows and columns in the map is increased and, as the position of each pixel in the output map is known, values are assigned to these pixels by means of nearest neighbour, or a bilinear or bicubic interpolation using values from the input map.
Dialog box options:
Input raster map: |
Select an input raster map or an input map list. Open the list box and select the desired input map or map list, or directly drag a raster map or map list from a Catalog into this box. When you select an input map list, the operation will be performed on all raster maps in the map list. |
Densify factor: |
Enter a value by which the number of rows and columns of the input map should be multiplied (real value >= 1). |
Interpolation method: |
Select an interpolation method which is used to determine the pixel values in the output map. |
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To assign to each output pixel the value of the nearest pixel in the input map; this option is available for input maps with any domain. |
To calculate for each output pixel a value from 4 surrounding pixels in the input map; this option is available for value maps. |
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To calculate for each output pixel a value from 16 surrounding pixels in the input map; this option is available for value maps. |
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Output raster map: |
Type a name for the output raster map. If you selected an input map list, then you can type a name for the output map list; all raster maps in the output map list will obtain this name followed by _1, _2, _3, etc. |
Value range: |
Accept the default value range, or specify your own range of possible values in the output map(s). |
Precision: |
Accept the default precision of output values, or specify your own precision. |
Description: |
Optionally, type a description for the output map or the output map list. The description will appear in the status bar of the Main window when moving the mouse pointer over the map in a Catalog, and in the title bar of a map window when the output map is displayed. If no description is supplied, the output map or the output map list will use its own definition as description. |
When you selected a single raster map as input:
When you selected a map list as input:
Furthermore, a new georeference will be created for the output map; this georeference obtains the same name as the output map, or the same name as the output map list followed by _1.
Restriction:
For a Bilinear or a Bicubic interpolation, the input raster map should be a value map.
See also: