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Options - Data Search Option
The data search option allows
you to search for data points based on proximity to the grid node or to
use a directional bias. These search parameters have an effect on the
smoothing of the data. The larger the number of values used in the calculation,
the greater the smoothing.
Click <More Options> in the
Kernel Gridding window. A new window will open. Click the down arrow
in the right-hand corner of the window under Data
Search Option to view the list of available options:
- Use all data
– Uses up to 20 input data values per interpolation. Values are
selected based on proximity to the grid node only, with no attempt to
use a directional bias.
- Use Quadrant
Search – Divides area around the grid node into four regions. Each
region is searched for the number of values you specify in the text box
to the right. The closest input data points are selected.
- Use Octant Search
– Divides the area around the node into eight regions. Each region
is searched for the number of values you specify in the text box to the
right. The closest input data points are selected. An octant search for
‘2’ data values would provide 16 values (2 x 8) for the calculation of
the grid node value.
- The data search option is not available in the more options dialog box
for the minimum curvature gridding method.
- To honor your data points as closely as possible, limit the search function
to only one data point. This will shorten the distance from the grid node
to the data points used to calculate its value. If you set the data search options to Quadrant Search and
enter 1 for the data value, the grid node values will be calculated
from the nearest data point in each quadrant.
What do you want to do?