Pitney Bowes MapInfo Vertical Mapper - Manual (Page 152)

Resizing a Grid
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Vertical Mapper 3.7
The Suggested Range box displays the suggested range of cell sizes appropriate for the projection.
The File Size and Dimension boxes display the file size and dimensions of the grid in the new
projection.
The File Name box enables you to specify the file name.
Resizing a Grid
You can adjust the resolution of a grid. For example, you might need to reduce the size and
complexity of grid files in preparation for contour threading. While a very high resolution grid file is
suitable for modeling and high quality output, a lower resolution version of the same file is adequate
for generating contour lines or regions. When the cell size of an existing grid is increased, a new
value must be interpolated for every cell in the new grid. You can visualize the original smaller cell
grid as a network of nodes overlain by a new network consisting of more widely spaced nodes. The
value at the new grid node is calculated using a bilinear interpolation (rectangular interpolation) of
the four nearest nodes of the underlying, more closely-spaced grid.
The file size increases when you resize a grid to a higher resolution. While a high-resolution grid is
not more accurate, reducing the grid cell size will generate a more highly smoothed surface and
shows a continuous gradient colour fill over the grid area.
1. In the Grid Manager, click the Tools button and choose the Resizer command.
2. From the Grid list, choose the grid you want to reclass.
3. In the Resize Parameters section, enter a new cell size in the New Cell Size box.
4. In the File name box, type a new file name or accept the default.
5. Click the OK button.
Exploring the Resizer Dialog Box
The Resizer dialog box enables you to set the parameters for a new grid. The New Cell Size box
enables you to specify a new cell size.