Fill DEM Hole |

### Fill DEM Hole Operator

The operator fills holes in DEM product with linear interpolations in both row and column directions.

For a given DEM pixel, if its value is the same as No Data Value (which is input by user from UI), then it is identified as a pixel in hole.

For a pixel in hole, a linear interpolation in the row direction is performed first using the nearest two valid pixel values in the row. Then a similar linear interpolation is performed in column direction. Finally the average of the two interpolated pixel values is assigned to the hole pixel.

The following parameters are used by the operator:

1. Source Bands: Band of DEM product.

2. No Data Value: Value for invalid pixels in DEM.