Pitney Bowes MapInfo Vertical Mapper User Manual
Page 89
Chapter 5: Creating Grids Using Other Methods
User Guide
87
Assign Same Value dialog box accepts the value you want to assign to all checked colors.
The default value is the value of the last selected Color (row). If no row is selected, the first
non-null value from the checked color list is taken. If you want the NULL value to be assigned
to all checked colors, it can be left blank.
For every color, which is left without being assigned any value in the Grid Control, will be
assumed as null.
For every color, which is not displayed in the Grid Control but is present in the raster image,
will be mapped to the nearest color defined in the Grid Control and assigned the same value.
If there is no resultant color mapping, null value will be assumed.
•
From the drop down menu
select the unit of the Z-value for the grid to be
generated.
•
Selecting the Grid Smoothing check box smoothes the resulting grid. There are three levels
of smoothing: high, medium, and low.
•
Selecting the Resize Grid check box changes the size of the resulting grid by a percentage
value. Type a value that is between 5% and 95%; a value outside of this range changes to
the nearest boundary value. When this check box is unchecked, the size of the Raster and
Grid images are the same.
4. On successful completion of the conversion process, the grid file will be opened in a new mapper
window. The grid file will be created in the same directory where the raster tab file exists but if
the user has no write access at the raster source path, default grid tab file path will be the My‘
Documents path of that particular user. The name of the grid file will be the name of the raster
tab file with *_GX suffixed to it where X is a number.
5. Click the
button to create the grid.
Note If you want to perform contouring on a created grid with this tool, you can choose the
following configurations:
•
For higher performance of contouring, choose the Smoothing Level as High.
•
For minimum deterioration in the quality of both Grid and Contoured files, choose the Max No
of Colors option with value as 1000.
•
For a very large raster image, resize the grid to a smaller size to enhance contouring
performance.