Pengumuman: Semua project nonkomersial yang terdaftar untuk menggunakan Earth Engine sebelum
15 April 2025 harus
memverifikasi kelayakan nonkomersial untuk mempertahankan akses Earth Engine.
ee.Algorithms.HillShadow
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Membuat band bayangan, dengan output 1 jika piksel diterangi dan 0 jika piksel dibayangi. Mengambil sebagai input rentang elevasi, azimut, dan zenit sumber cahaya dalam derajat, ukuran lingkungan, dan apakah akan menerapkan histeresis atau tidak saat bayangan muncul. Saat ini, algoritma ini hanya berfungsi untuk proyeksi Mercator, yang sinar cahayanya paralel.
| Penggunaan | Hasil |
|---|
ee.Algorithms.HillShadow(image, azimuth, zenith, neighborhoodSize, hysteresis) | Gambar |
| Argumen | Jenis | Detail |
|---|
image | Gambar | Gambar yang akan diterapkan algoritma bayangan, yang setiap pikselnya harus merepresentasikan elevasi dalam meter. |
azimuth | Float | Azimut dalam derajat. |
zenith | Float | Zenit dalam derajat. |
neighborhoodSize | Bilangan bulat, default: 0 | Ukuran lingkungan. |
hysteresis | Boolean, default: false | Gunakan histeresis. Kurang akurat secara fisik, tetapi dapat menghasilkan gambar yang lebih baik. |
Kecuali dinyatakan lain, konten di halaman ini dilisensikan berdasarkan Lisensi Creative Commons Attribution 4.0, sedangkan contoh kode dilisensikan berdasarkan Lisensi Apache 2.0. Untuk mengetahui informasi selengkapnya, lihat Kebijakan Situs Google Developers. Java adalah merek dagang terdaftar dari Oracle dan/atau afiliasinya.
Terakhir diperbarui pada 2025-07-26 UTC.
[null,null,["Terakhir diperbarui pada 2025-07-26 UTC."],[[["\u003cp\u003eGenerates a binary shadow map (1 for illuminated, 0 for shadowed) based on terrain elevation, sun position, and optional hysteresis.\u003c/p\u003e\n"],["\u003cp\u003eThe algorithm utilizes a neighborhood size parameter to determine shadowing and currently supports only Mercator projections with parallel light rays.\u003c/p\u003e\n"],["\u003cp\u003eInput elevation data should be in meters and sun position is defined by azimuth and zenith angles in degrees.\u003c/p\u003e\n"],["\u003cp\u003eHysteresis can be enabled to potentially improve visual results but may compromise physical accuracy.\u003c/p\u003e\n"]]],["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"],null,["# ee.Algorithms.HillShadow\n\nCreates 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.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-------------------------------------------------------------------------------------------|---------|\n| `ee.Algorithms.HillShadow(image, azimuth, zenith, `*neighborhoodSize* `, `*hysteresis*`)` | Image |\n\n| Argument | Type | Details |\n|--------------------|-------------------------|----------------------------------------------------------------------------------------------------------------|\n| `image` | Image | The image to which to apply the shadow algorithm, in which each pixel should represent an elevation in meters. |\n| `azimuth` | Float | Azimuth in degrees. |\n| `zenith` | Float | Zenith in degrees. |\n| `neighborhoodSize` | Integer, default: 0 | Neighborhood size. |\n| `hysteresis` | Boolean, default: false | Use hysteresis. Less physically accurate, but may generate better images. |"]]
