The avatar for @sahilchinoy
Sahil Chinoy
Published
Edited
Jan 6, 2022
5 forks
Importers
94 stars
mapping experiments
Tanaka contoursContour mapMultidirectional hillshaderA faster hillshader
Hillshader
Areal interpolation IIIAreal interpolation IIAreal interpolation I
Also listed in…
Maps
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function getDerivatives(top, left, bottom, right) {
const dzdx = right - left;
const dzdy = top - bottom;

return {
dzdx,
dzdy
};
}
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getSlope = (dzdx, dzdy, z = 0.2) =>
Math.atan(z * Math.sqrt(dzdx ** 2 + dzdy ** 2)) // the z factor controls how exaggerated the peaks look
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getAspect = (dzdx, dzdy) => {
return Math.atan2(-dzdy, -dzdx);
}
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function getReflectance(aspect, slope, sunAzimuth, sunElevation) {
return (
Math.cos(Math.PI * 0.5 - aspect - sunAzimuth) *
Math.sin(slope) *
Math.sin(Math.PI * 0.5 - sunElevation) +
Math.cos(slope) * Math.cos(Math.PI * 0.5 - sunElevation)
);
}
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