Pitney Bowes MapInfo Vertical Mapper - Manual (Page 127)

Chapter 7: Using Grids for Spatial Analysis
User Guide
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The Cell Size box enables you to set any user-defined value but, as with any grid creation
technique, cell size is inversely proportional to file size. This value defaults to the smallest cell size
found in all of the open grids.
The X-min, X-max and Y-min, Y-max boxes enable you to set any user-defined values. They
default to the maximum extent covered by the grids used in the query expression.
The Trim Null Rows & Columns check box enables you to remove any columns or rows of null
value cells from the edges of the grid.
The Projection field records the coordinate system of the open grids and is a non-editable setting
for the Grid Query command. All grids included in a Grid Query expression must be in the same
MapInfo Professional coordinate system as the coordinate system of the output grid.
Structuring the Output Results of a Grid Query
The second step of a grid query command requires you to assign values on a cell-by-cell basis to
the new grid when the query conditions are met (true) or not met (false) for each set of overlying
cells.
Exploring the Output Results Dialog Box
The Output Results dialog box is designed to guide you in making three decisions regarding the
form of the output grid file:
• What type of output grid to build: numeric or character-based.
• What value to assign to grid cells that DO meet all of the query conditions (TRUE).
• What value to assign to grid cells that DO NOT meet the query conditions (FALSE).