ALOS World 3D - 30m (AW3D30) adalah set data model permukaan digital (DSM) global dengan resolusi horizontal sekitar 30 meter (mesh 1 detik busur). Set data ini didasarkan pada set data DSM
(versi mesh 5 meter) dari Data Topografi 3D Dunia.
Detail selengkapnya tersedia dalam dokumentasi set data.
Set data yang di-ingest ini menggabungkan data dari versi 3.1, 4.0, dan 4.1.
Versi 4.1 (April 2024): Update besar ini merilis 19.051 petak yang mencakup wilayah global (kecuali Antartika dan Jepang). Model ini menggabungkan data tambahan baru untuk pengisian kekosongan dan memperbaiki anomali parsial yang ditemukan dalam versi 3.1 dan 3.2, serta mengisi ulang kekosongan. Untuk pembaruan petak tertentu di v4.1, gunakan filter v4.1 pada petak peta atau lihat deskripsi format terbaru.
Versi 4.0 (April 2023): Pembaruan ini merilis 1.886 petak, yang meningkatkan kualitas wilayah lintang rendah dan menengah serta area di selatan 60 derajat lintang.
Perubahan penting meliputi:
1. Data tambahan baru untuk pengisian kekosongan.
2. Koreksi anomali sebagian dan pengisian ulang ruang kosong (2 petak).
3. Pembaruan garis pantai untuk wilayah di selatan 60 derajat lintang (44 petak).
4. Menonaktifkan mask air Laut Kaspia dan melengkapinya dengan data elevasi
(54 petak).
5. Mengekstrak dan memperbaiki area anomali parsial baru di Amerika Selatan
(1.786 petak).
6. Untuk mengetahui informasi kartu mendetail untuk v4.0, gunakan filter v4.0 pada
petak peta atau lihat deskripsi format.
Versi 3.2, yang dirilis pada Januari 2021, adalah versi yang ditingkatkan yang dibuat dengan mempertimbangkan kembali format di area lintang tinggi, data tambahan, dan metode pemrosesan. Jarak piksel yang berbeda untuk setiap zona lintang diterapkan di area lintang tinggi. Data garis pantai, yang merupakan salah satu set data tambahan, diubah, dan data tambahan baru digunakan. Selain itu, sebagai data sumber untuk Jepang, AW3D versi 3 juga digunakan.
Selain itu, metode pendeteksian nilai anomali dalam proses ditingkatkan.
Ketinggian DSM AW3D dihitung dengan proses pencocokan gambar yang menggunakan pasangan stereo gambar optik. Awan, salju, dan es diidentifikasi secara otomatis selama pemrosesan dan informasi mask diterapkan. Namun, titik yang tidak cocok terkadang tetap ada, terutama di sekitar (atau di tepi) area awan, salju, dan es, yang menyebabkan beberapa kesalahan ketinggian di DSM akhir.
Band
Ukuran Piksel 30 meter
Band
Nama
Min
Maks
Ukuran Piksel
Deskripsi
DSM
-433*
8768*
meter
Ketinggian di atas permukaan laut. 16 bit bertanda.
Ketinggian (dalam meter) yang dikonversi dari ketinggian elipsoid berdasarkan ITRF97 dan GRS80, menggunakan model geoid EGM96†1.
STK
1*
54*
meter
Jumlah penumpukan DSM unit adegan yang digunakan dalam menghasilkan DSM. Rentang ini diperoleh dengan melakukan resampling pada jumlah penumpukan untuk DSM resolusi 5 m ke resolusi 30 m.
MSK
meter
Mask 8-bit untuk rentang.
Bitmask untuk MSK
Bit 0-7: Dibuat dari DSM yang di-resample.
0: Valid
1: Masker awan dan salju (tidak valid).
2: Masker air daratan dan korelasi rendah (valid).
3: Masker laut (valid).
4: Kekosongan diisi dengan DTM GSI (valid).
8: Ruang kosong diisi dengan Shuttle Radar Topography Mission
SRTM-1 Versi 3 (valid).
12: Ruang kosong diisi dengan PRISM DSM (valid).
16: Ruang kosong diisi dengan DEM Panorama ViewFinder (valid).
24: Ruang kosong diisi dengan ASTER GDEM v2 (valid).
28: Kekosongan diisi dengan ArcticDEM v2 (valid).
32: Kekosongan diisi dengan DEM TanDEM-X 90 m (valid).
36: Ruang kosong diisi dengan ArcticDEM v3 (valid).
40: Kekosongan diisi dengan ASTER GDEM v3 (valid).
44: Ruang kosong diisi dengan REMA v1.1 (valid).
48: Kekosongan diisi dengan Copernicus DEM GLO-30 (valid).
52: Kekosongan diisi dengan ArcticDEM v4 (valid).
252: Kekosongan diisi dengan metode IDW yang diterapkan (gdal_fillnodata) (valid)
T. Tadono, H. Ishida, F. Oda, S. Naito, K. Minakawa, H. Iwamoto
Precise Global DEM Generation By ALOS PRISM, ISPRS Annals of
the Photogrammetry, Remote Sensing and Spatial Information Sciences,
Vol.II-4, pp.71-76, 2014. File PDF
J. Takaku, T. Tadono, K. Tsutsui : Generation of High Resolution
Global DSM from ALOS PRISM, The International Archives of the Photogrammetry,
Remote Sensing and Spatial Information Sciences, Vol. XL-4, pp.243-248,
ISPRS, 2014. File PDF
J. Takaku, T. Tadono, K. Tsutsui, M. Ichikawa : Validation of
'AW3D' Global DSM Generated from ALOS PRISM, ISPRS
Annals of the Photogrammetry, Remote Sensing and Spatial Information
Sciences, Vol.III-4, hlm.25-31, 2016. File PDF
T. Tadono, H. Nagai, H. Ishida, F. Oda, S. Naito, K. Minakawa,
H. Iwamoto : Initial Validation of the 30 m-mesh Global Digital
Surface Model Generated by ALOS PRISM, The International Archives
of the Photogrammetry, Remote Sensing and Spatial Information Sciences,
ISPRS, Vol. XLI-B4, hlm.157-162, 2016. File PDF
J. Takaku, T. Tadono, M. Doutsu, F. Ohgushi, dan H. Kai, : "Updates of
'AW3D30' ALOS Global Digital Surface Model in Antarctica with Other Open
Access Datasets", Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.,
XLIII-B4-2021, 401-408, 2021. File PDF
ALOS World 3D - 30m (AW3D30) adalah set data model permukaan digital (DSM) global dengan resolusi horizontal sekitar 30 meter (mesh 1 detik busur). Set data ini didasarkan pada set data DSM (versi mesh 5 meter) Data Topografi 3D Dunia. Detail selengkapnya tersedia dalam dokumentasi set data. …
[null,null,[],[],[],null,["# ALOS DSM: Global 30m v4.1\n\nDataset Availability\n: 2006-01-24T00:00:00Z--2011-05-12T00:00:00Z\n\nDataset Provider\n:\n\n\n [JAXA Earth Observation Research Center](https://www.eorc.jaxa.jp/ALOS/en/dataset/aw3d30/aw3d30_e.htm)\n\nTags\n:\n[alos](/earth-engine/datasets/tags/alos) [dem](/earth-engine/datasets/tags/dem) [elevation](/earth-engine/datasets/tags/elevation) [elevation-topography](/earth-engine/datasets/tags/elevation-topography) [geophysical](/earth-engine/datasets/tags/geophysical) [jaxa](/earth-engine/datasets/tags/jaxa) [topography](/earth-engine/datasets/tags/topography) \n\n#### Description\n\nALOS World 3D - 30m (AW3D30) is a global digital surface\nmodel (DSM) dataset with a horizontal resolution of approximately\n30 meters (1 arcsec mesh). The dataset is based on the DSM dataset\n(5-meter mesh version) of the [World 3D Topographic Data](https://www.aw3d.jp/en/).\nMore details are available in the dataset [documentation](https://www.eorc.jaxa.jp/ALOS/en/dataset/aw3d30/data/aw3d30v4.1_product_e_1.0.pdf).\n\nThis ingested dataset combines data from versions 3.1, 4.0, and 4.1.\n\nVersion 4.1 (April 2024): This major update released 19,051 tiles covering\nglobal regions (excluding Antarctica and Japan). It incorporates new\nsupplementary data for void filling and corrects partial anomalies found in\nversions 3.1 and 3.2, along with re-filling voids. For specific tile updates\nin v4.1, please use the v4.1 filter on map tiles or consult the latest\nformat description.\n\nVersion 4.0 (April 2023): This update released 1,886 tiles, improving low\nand mid-latitude regions and areas south of 60 degrees latitude.\n\nKey changes include:\n1. New supplementary data for void filling.\n2. Correction of partial anomalies and re-filling of voids (2 tiles).\n3. Updated coastlines for regions south of 60 degrees latitude (44 tiles).\n4. Disabled Caspian Sea water mask and supplemented with elevation data\n(54 tiles).\n5. Extracted and corrected new partial anomaly areas in South America\n(1,786 tiles).\n6. For detailed tile information for v4.0, please use the v4.0 filter on\nmap tiles or refer to the format description.\n\nVersion 3.2, released in January 2021, is an improved version created by\nreconsidering the format in the high latitude area, auxiliary data, and\nprocessing method. Different pixel spacing for each latitude zone was\nadopted at high latitude area. Coastline data, which is one of the\nauxiliary datasets, was changed, and new supplementary data was used. In\naddition, as a source data for Japan, AW3D version 3 was also used.\nFurthermore, the method of detecting anomalous values in the process was\nimproved.\n| **Note:** See the code example for the recommended way of computing slope. Unlike most DEMs in Earth Engine, this is an image collection due to multiple resolutions of source files that make it impossible to mosaic them into a single asset, so the slope computations need a reprojection.\n\nThe AW3D DSM elevation is calculated by an image matching process\nthat uses a stereo pair of optical images. Clouds, snow, and ice are\nautomatically identified during processing and applied the\nmask information. However, mismatched points sometimes\nremain especially surrounding (or at the edges of) clouds, snow,\nand ice areas, which cause some height errors in the final DSM.\n\n### Bands\n\n\n**Pixel Size**\n\n30 meters\n\n**Bands**\n\n| Name | Min | Max | Pixel Size | Description |\n|-------|--------|--------|------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `DSM` | -433\\* | 8768\\* | meters | Height above sea level. Signed 16 bits. Elevation (in meter) converted from the ellipsoidal height based on ITRF97 and GRS80, using EGM96†1 geoid model. |\n| `STK` | 1\\* | 54\\* | meters | Stacking number of the scene unit DSM used in producing DSM. The band is derived by resampling the stacking number for 5m resolution DSM to 30m resolution. |\n| `MSK` | | | meters | 8-bit mask for the band. |\n| Bitmask for MSK - Bits 0-7: Generated from resampled DSM. - 0: Valid - 1: Cloud and snow mask (invalid). - 2: Land water and low correlation mask (valid). - 3: Sea mask (valid). - 4: Void filled with GSI DTM (valid). - 8: Void filled with Shuttle Radar Topography Mission SRTM-1 Version 3 (valid). - 12: Void filled with PRISM DSM (valid). - 16: Void filled with ViewFinder Panoramas DEM (valid). - 24: Void filled with ASTER GDEM v2 (valid). - 28: Void filled with ArcticDEM v2 (valid). - 32: Void filled with TanDEM-X 90m DEM (valid). - 36: Void filled with ArcticDEM v3 (valid). - 40: Void filled with ASTER GDEM v3 (valid). - 44: Void filled with REMA v1.1 (valid). - 48: Void filled with Copernicus DEM GLO-30 (valid). - 52: Void filled with ArcticDEM v4 (valid). - 252: Void filled with applied IDW method (gdal_fillnodata) (valid) ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n\n\\* estimated min or max value\n\n### Terms of Use\n\n**Terms of Use**\n\nThis dataset is available to use with no charge under\nthe conditions specified in the [Terms of use for ALOS Global Digital\nSurface Model](https://earth.jaxa.jp/en/data/policy/).\n\n### Citations\n\nCitations:\n\n-\n\n T. Tadono, H. Ishida, F. Oda, S. Naito, K. Minakawa, H. Iwamoto\n : Precise Global DEM Generation By ALOS PRISM, ISPRS Annals of\n the Photogrammetry, Remote Sensing and Spatial Information Sciences,\n Vol.II-4, pp.71-76, 2014. [PDF file](https://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/II-4/71/2014/isprsannals-II-4-71-2014.pdf)\n- J. Takaku, T. Tadono, K. Tsutsui : Generation of High Resolution\n Global DSM from ALOS PRISM, The International Archives of the Photogrammetry,\n Remote Sensing and Spatial Information Sciences, Vol. XL-4, pp.243-248,\n ISPRS, 2014. [PDF file](https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-4/243/2014/isprsarchives-XL-4-243-2014.pdf)\n- J. Takaku, T. Tadono, K. Tsutsui, M. Ichikawa : Validation of\n 'AW3D' Global DSM Generated from ALOS PRISM, ISPRS\n Annals of the Photogrammetry, Remote Sensing and Spatial Information\n Sciences, Vol.III-4, pp.25-31, 2016. [PDF file](https://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/III-4/25/2016/isprs-annals-III-4-25-2016.pdf)\n- T. Tadono, H. Nagai, H. Ishida, F. Oda, S. Naito, K. Minakawa,\n H. Iwamoto : Initial Validation of the 30 m-mesh Global Digital\n Surface Model Generated by ALOS PRISM, The International Archives\n of the Photogrammetry, Remote Sensing and Spatial Information Sciences,\n ISPRS, Vol. XLI-B4, pp.157-162, 2016. [PDF file](https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B4/157/2016/isprs-archives-XLI-B4-157-2016.pdf)\n- J. Takaku, T. Tadono, M. Doutsu, F. Ohgushi, and H. Kai, : \"Updates of\n 'AW3D30' ALOS Global Digital Surface Model in Antarctica with Other Open\n Access Datasets\", Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.,\n XLIII-B4-2021, 401-408, 2021. [PDF file](https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLIII-B4-2021/401/2021/isprs-archives-XLIII-B4-2021-401-2021.pdf)\n\n### Explore with Earth Engine\n\n| **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)\n\n### Code Editor (JavaScript)\n\n```javascript\nvar dataset = ee.ImageCollection('JAXA/ALOS/AW3D30/V4_1');\nvar elevation = dataset.select('DSM');\nvar elevationVis = {\n min: 0,\n max: 5000,\n palette: ['0000ff', '00ffff', 'ffff00', 'ff0000', 'ffffff']\n};\nMap.setCenter(138.73, 35.36, 11);\nMap.addLayer(elevation, elevationVis, 'Elevation');\n\n// Reproject an image mosaic using a projection from one of the image tiles,\n// rather than using the default projection returned by .mosaic().\nvar proj = elevation.first().select(0).projection();\nvar slopeReprojected = ee.Terrain.slope(elevation.mosaic()\n .setDefaultProjection(proj));\nMap.addLayer(slopeReprojected, {min: 0, max: 45}, 'Slope');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/JAXA/JAXA_ALOS_AW3D30_V4_1) \n[ALOS DSM: Global 30m v4.1](/earth-engine/datasets/catalog/JAXA_ALOS_AW3D30_V4_1) \nALOS World 3D - 30m (AW3D30) is a global digital surface model (DSM) dataset with a horizontal resolution of approximately 30 meters (1 arcsec mesh). The dataset is based on the DSM dataset (5-meter mesh version) of the World 3D Topographic Data. More details are available in the dataset documentation. ... \nJAXA/ALOS/AW3D30/V4_1, alos,dem,elevation,elevation-topography,geophysical,jaxa,topography \n2006-01-24T00:00:00Z/2011-05-12T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.eorc.jaxa.jp/ALOS/en/dataset/aw3d30/aw3d30_e.htm)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/JAXA_ALOS_AW3D30_V4_1)"]]
