ee.Algorithms.HillShadow
Creates a shadow band, with output 1 where pixels are illumunated and 0 where they are shadowed. Takes as input an elevation band, azimuth and zenith of the light source in degrees, a neighborhood size, and whether or not to apply hysteresis when a shadow appears. Currently, this algorithm only works for Mercator projections, in which light rays are parallel.
| Usage | Returns |
|---|
ee.Algorithms.HillShadow(image, azimuth, zenith, neighborhoodSize, hysteresis) | Image |
| Argument | Type | Details |
|---|
image | Image | The image to which to apply the shadow algorithm, in which each pixel should represent an elevation in meters. |
azimuth | Float | Azimuth in degrees. |
zenith | Float | Zenith in degrees. |
neighborhoodSize | Integer, default: 0 | Neighborhood size. |
hysteresis | Boolean, default: false | Use hysteresis. Less physically accurate, but may generate better images. |
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Last updated 2023-10-06 UTC.
[null,null,["Last updated 2023-10-06 UTC."],[[["Generates a binary shadow map (1 for illuminated, 0 for shadowed) based on terrain elevation, sun position, and optional hysteresis."],["The algorithm utilizes a neighborhood size parameter to determine shadowing and currently supports only Mercator projections with parallel light rays."],["Input elevation data should be in meters and sun position is defined by azimuth and zenith angles in degrees."],["Hysteresis can be enabled to potentially improve visual results but may compromise physical accuracy."]]],["The `HillShadow` algorithm generates a shadow band (1 for illuminated, 0 for shadowed pixels) for Mercator projections. It requires an elevation image, light source azimuth and zenith angles, and a neighborhood size. Hysteresis can be optionally applied for potentially improved visuals. The algorithm's inputs include the elevation image, azimuth (degrees), zenith (degrees), neighborhood size, and a boolean for hysteresis, outputting a shadow band image.\n"]]