Talk:Hillshading using the Alpha Channel of an Image

Notes about the script for generating these tiles

• Doesn't use Metatiles
• Has artifacts at the edges of the raw DEM "tiles"
• Experiment with combined lighting rather than a single light
• Use dynamic, on-the-fly rendering, rather than pre-rendering? Might be very memory intensive.
• Use single-step hillshading and alpha-channel modification to save time (don't write intermediate file to disk)
• Some claim there is a ~50-Meter offset to the ground truth
• Use GDAL for the hillshading step, not PerryGeo's demtools