Defining Grid Geometry

Define the grid geometry by setting the gridding area, extents and grid density.

If you use a SMART Polygon to limit data for gridding, the data points specified by the polygon will be displayed in the gridding window. You may arrange your grid geometry as you like. Gridding will be done using only the specified data. After gridding, all grid nodes in the area excluded by the polygon are dropped.

Setting the Gridding Area

You can manually drag and rotate the x- and y- grid axes or enter UTMUniversal Transverse Mercator coordinates and grid orientation to define the gridding area.

Manually Dragging and Rotating the X- and Y-axes

Rotating the grid: Place your cursor on the northwest or southeast corner of the blue grid outline. A green circle will appear. Left click and, without releasing the mouse button, move the mouse to rotate the grid.
Shifting the grid: Left-click anywhere within the grid window and, without releasing the mouse button, drag the grid to a new location.
Resizing the grid: Place your cursor on one of the red edges of the grid. The line will change to green. Left-click and, without releasing the mouse button, move the mouse to compress or expand the grid area. The number of grid lines remains constant, while the line spacing is automatically adjusted over the grid length.

Entering UTM Coordinates and Angle

Enter UTM coordinates to define the origin of the grid (lower left-hand corner) under UTMX and UTMY in the Gridding Geometry section. Click on <Update Grid Map>.
Enter an angle for the grid orientation under Angle (deg) in the Grid Geometry section. Click on <Update Grid Map>.

Setting the Grid Density

Setting the grid density involves specifying the grid spacing and the number of grid lines. Increasing the number of grid lines and decreasing the grid spacing, increases the grid density. Greater grid density results in more accurate maps, but requires more time and system resources to calculate. Click <Update Grid Map> after making changes to the grid spacing and lines.

Settings for the grid geometry are saved to a gridding geometry file each time you execute a gridding operation. This makes it easier to produce a consistent set of maps for your project. You must use the same grid geometry to generate all grids that will be used as part of a given equation in Grid Math.
Under More Options, you can specify inclusion of Data Outside Gridding Area so that you can create a grid covering only your area of interest and still have grid node values reflect values outside the actual grid area limit. Note that this option has no effect if you are using a SMART Polygon to Drop Data Inside or Outside of the polygon.

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