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Oregon Earthquakes: Setting a raster hillshade layer's resampling method
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Raster Resampling is set to the default Nearest Neighbor which is best for discrete data like land use or soils; notice that the pixel edges are obvious.
Raster Resampling is set to the default Nearest Neighbor which is best for discrete data like land use or soils; notice that the pixel edges are obvious.
Raster Resampling is set to Bilinear Interpolation which is better for continuous data like hillshades; notice the smoothed appearance of the pixels.
Raster Resampling is set to Bilinear Interpolation which is better for continuous data like hillshades; notice the smoothed appearance of the pixels.

What: If you use the default settings to display your hillshade, you are likely to see a really pixelly looking image, especially if you zoom in on your map. Why: This is not the smooth display that we really want to see on our map. Since the default for the software is to assume we are dispaying discrete data, such as zoning, land use or soils, the resampling method for the display is not set appropriately for smotth continuous data, such as hillshades and layer (hypsometric) tints. so we need to override the default. How: A smoother looking display for continuous data can be easily achieved by simply setting the display resampling method to Bilinear Interpolation.

  1. To set the resampling method, right click the layer, select Properties.
  2. Under the Display tab, click the drop down arrow next to Resampling Method and choose Bilinear Interpolation.

To learn more about the various raster display resampling techniques and other raster properties that may affect drawing quality and performance, read the online help for "Performance tuning for displaying raster data".

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