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<p>A power of 1 is a linear interpolation among all points in the
search radius.</p>
<p><br>
</p>
<p>A power of 2 causes the "closest point" in the search radius to
have a slightly higher weight.</p>
<p><br>
</p>
<p>A power of 4, 6 and especially 10 causes the closest point to
behave like a polygonal or theissen polygon.</p>
<p><br>
</p>
<p>A power of 0.5 causes the farther away points to have a larger
influence than closer points....<br>
</p>
<p><br>
</p>
<p>The equations used only depend on the distance the points are
from each other. NOT the value of any of the points. Though
David has a section on how the variogram can be applied to IDS.<br>
</p>
<p><br>
</p>
<p>All the power IDS theory (if there is one) came out of the mining
industry in the early 1960's because it was simple.<br>
</p>
<p><br>
</p>
<p>Hope this helps.</p>
<p>J.O. Williams</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 9/17/19 4:00 AM, Daniel Zepeda Rivas
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:AM6PR02MB42623D89E70C5E074DADB1E59A8F0@AM6PR02MB4262.eurprd02.prod.outlook.com">
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<p style="margin: 0px 0px 6px; font-family: Helvetica, Arial,
sans-serif; color: rgb(29, 33, 41); font-size: 14px;
background-color: rgb(255, 255, 255)">
When using the Raster -> Analysis -> Grid (Inverse
Distance to a Power)</p>
<p style="margin: 6px 0px; font-family: Helvetica, Arial,
sans-serif; color: rgb(29, 33, 41); font-size: 14px;
background-color: rgb(255, 255, 255)">
At the menu just before pressing run, can somebody please
explain me the effect of the "Weighting power" option in the
interpolation process?</p>
<p style="margin: 6px 0px 0px; display: inline; font-family:
Helvetica, Arial, sans-serif; color: rgb(29, 33, 41);
font-size: 14px; background-color: rgb(255, 255, 255)">
I'm trying to make a temperature map based on points
representing each weather station, containing the yearly
averages values of temperature, and when moving the number
from the 2 (set it by default) to 4, 6 or 10, the map changes
significantly</p>
<br>
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