# Local Polynomial

The Local Polynomial gridding
method assigns values to grid nodes by using a weighted least squares
fit with data within the grid node's search ellipse.

## Local Polynomial Advanced Options Dialog

In the Grid Data dialog, specify Local Polynomial as the Gridding
Method and click the Advanced
Options button to open the Local
Polynomial Advanced Options dialog.

Choose a Power
and Polynomial Order in
the Local

Polynomial
Advanced Options dialog.

## General Page

On the General page, set the
Power to a number between 0 and
20, then select a Polynomial Order,
1, 2, or 3.

### Power

Set the Power to a number between
0 and 20. The
*Power* parameter is used to assign the power for the weighted least
square function, see Local
Polynomial Math. This
allows data closer to the grid node to have more impact on the value of
the grid node than data farther away. This parameter is similar to the
Inverse Distance to a Power
gridding method.

### Polynomial Order

Select a Polynomial Order,
1, 2, or 3.

1: F(X,Y) = a +bX + cY

2: F(X,Y) = a +bX + cY + dXY + eX2
+ fX2

3: F(X,Y) = a +bX + cY + dXY + eX2
+ fX2 +gX2Y + hXY2 + iX3 + iY3

## Search Page

The Search page allows you to
specify search rules.

## Breaklines Page

The Breaklines page is used to
add breaklines to the gridding
process. Faults are not supported with Local
Polynomial.

See Also

Grid Data

Local Polynomial Math

General Gridding Recommendations