GEOLOGICAL VALUE INTERPOLATION BY USING CATGEOKU SOFTWARE

The following is a summary of the steps for determining the value of data using the IDW method:

1. Determine the target point to be predicted and collect variable data from the sample points.

2. Calculate the distance between the target point and each sample. If using 3D coordinates (X, Y, Z), use Euclidean distance:

\[ d_i = \sqrt{(X_0 - X_i)^2 + (Y_0 - Y_i)^2 + (Z_0 - Z_i)^2} \]

3. Calculate the weight of each sample using:

4. Multiply the weight by the sample value, then sum up all the results. The power parameter $p$ is usually 2.

\[ w_i = \frac{\dfrac{1}{d_i^p}}{\sum_{j=1}^{n} \dfrac{1}{d_j^p}} \]

5. The sum is the estimated value at the target point, with automatically greater weight given to samples that are closer.

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YOUR WORKSPACE

Enter data (X, Y, Z, Value) from Excel (copy-paste):
100 200 10 45 105 210 15 52 110 220 20 47 115 230 25 61 120 240 30 55

Select Method: IDW

Target Coordinates (X, Y, Z):
X: Y: Z:

Prediction Result:

Visualization:

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Reference:
Sarita, R., Lepong, P., & Asmaidi. (2024). Analisis interpolasi inverse distance weighted (IDW) dan ordinary kriging (OK) untuk estimasi volume batubara di area Sebuku Kalimantan Selatan. Jurnal Geosains Kutai Basin, 7(1), 1–15. E-ISSN 2615-5176.