MCD18A1 Versi 6.2
adalah produk bergrid Radiasi Gelombang Pendek ke Bawah (DSR) gabungan Terra dan Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) Level 3 yang dihasilkan setiap hari pada resolusi piksel 1 kilometer dengan
estimasi DSR setiap 3 jam. DSR adalah radiasi matahari insiden di atas permukaan daratan dalam spektrum gelombang pendek (300-4.000 nanometer) dan merupakan variabel penting dalam model permukaan daratan yang menangani berbagai masalah ilmiah dan aplikasi. Produk MCD18 didasarkan pada
algoritma pembuatan prototipe yang menggunakan tanda tangan multi-temporal data MODIS untuk
mendapatkan pantulan permukaan dan kemudian menghitung DSR insiden menggunakan pendekatan tabel referensi (LUT). LUT mempertimbangkan berbagai jenis pemuatan aerosol dan awan pada berbagai geometri iluminasi/tampilan. Produk DSR global dihasilkan dari data satelit geostasioner dan MODIS.
Detail tambahan terkait metodologi yang digunakan untuk membuat data tersedia di
Dokumen Dasar Teoretis Algoritma.
Band
Ukuran Piksel 500 meter
Band
Nama
Unit
Min
Maks
Ukuran Piksel
Deskripsi
DSR
W/m^2
0
1400
meter
Total DSR instan di lintasan MODIS
Direct
W/m^2
0
1400
meter
DSR langsung seketika di jembatan penyeberangan MODIS
Diffuse
W/m^2
0
1400
meter
DSR difus instan di MODIS overpass
GMT_0000_DSR
W/m^2
0
1400
meter
Total DSR pada GMT 00.00
GMT_0300_DSR
W/m^2
0
1400
meter
Total DSR pada GMT 03.00
GMT_0600_DSR
W/m^2
0
1400
meter
Total DSR pada GMT 06.00
GMT_0900_DSR
W/m^2
0
1400
meter
Total DSR pada GMT 09.00
GMT_1200_DSR
W/m^2
0
1400
meter
Total DSR pada GMT 12.00
GMT_1500_DSR
W/m^2
0
1400
meter
Total DSR pada GMT 15.00
GMT_1800_DSR
W/m^2
0
1400
meter
Total DSR pada GMT 18.00
GMT_2100_DSR
W/m^2
0
1400
meter
Total DSR pada GMT 21.00
DSR_Quality
meter
Tanda kualitas
Bitmask untuk DSR_Quality
Bit 0-1: Sumber input data reflektansi permukaan
0: tidak ada data pantulan permukaan yang valid
1: dari produk MCD43
2: dari data klimatologi
Persyaratan Penggunaan
Persyaratan Penggunaan
Data dan produk MODIS yang diperoleh melalui LP DAAC tidak memiliki batasan pada penggunaan, penjualan, atau redistribusi berikutnya.
MCD18A1 Versi 6.2 adalah produk Level 3 berpetak Moderate Resolution Imaging Spectroradiometer (MODIS) Terra dan Aqua gabungan Downward Shortwave Radiation (DSR) yang diproduksi setiap hari pada resolusi piksel 1 kilometer dengan perkiraan DSR setiap 3 jam. DSR adalah radiasi surya insiden di atas permukaan daratan dalam spektrum gelombang pendek (300-4.000 …
[null,null,[],[],[],null,["Dataset Availability\n: 2000-03-03T00:00:00Z--2025-08-01T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://lpdaac.usgs.gov/products/mcd18a1v062/)\n\nCadence\n: 1 Day\n\nTags\n:\n[climate](/earth-engine/datasets/tags/climate) [par](/earth-engine/datasets/tags/par) [radiation](/earth-engine/datasets/tags/radiation) \n\nDescription \nThe MCD18A1 Version 6.2\nis a Moderate Resolution Imaging Spectroradiometer\n(MODIS) Terra and Aqua combined Downward Shortwave Radiation (DSR) gridded\nLevel 3 product produced daily at 1 kilometer pixel resolution with\nestimates of DSR every 3 hours. DSR is incident solar radiation over land\nsurfaces in the shortwave spectrum (300-4,000 nanometers) and is an\nimportant variable in land-surface models that address a variety of\nscientific and application issues. The MCD18 products are based on a\nprototyping algorithm that uses multi-temporal signatures of MODIS data to\nderive surface reflectance and then calculate incident DSR using the look-up\ntable (LUT) approach. The LUTs consider different types of loadings of\naerosols and clouds at a variety of illumination/viewing geometry. Global\nDSR products are generated from MODIS and geostationary satellite data.\nAdditional details regarding the methodology used to create the data are\navailable in the\n[Algorithm Theoretical Basis Document](https://lpdaac.usgs.gov/documents/106/MCD18_ATBD.pdf).\n\nBands\n\n\n**Pixel Size**\n\n500 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|----------------|--------|-----|------|------------|---------------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `DSR` | W/m\\^2 | 0 | 1400 | meters | Instantaneous total DSR at MODIS overpass |\n| `Direct` | W/m\\^2 | 0 | 1400 | meters | Instantaneous direct DSR at MODIS overpass |\n| `Diffuse` | W/m\\^2 | 0 | 1400 | meters | Instantaneous diffuse DSR at MODIS overpass |\n| `GMT_0000_DSR` | W/m\\^2 | 0 | 1400 | meters | Total DSR at GMT 00:00 |\n| `GMT_0300_DSR` | W/m\\^2 | 0 | 1400 | meters | Total DSR at GMT 03:00 |\n| `GMT_0600_DSR` | W/m\\^2 | 0 | 1400 | meters | Total DSR at GMT 06:00 |\n| `GMT_0900_DSR` | W/m\\^2 | 0 | 1400 | meters | Total DSR at GMT 09:00 |\n| `GMT_1200_DSR` | W/m\\^2 | 0 | 1400 | meters | Total DSR at GMT 12:00 |\n| `GMT_1500_DSR` | W/m\\^2 | 0 | 1400 | meters | Total DSR at GMT 15:00 |\n| `GMT_1800_DSR` | W/m\\^2 | 0 | 1400 | meters | Total DSR at GMT 18:00 |\n| `GMT_2100_DSR` | W/m\\^2 | 0 | 1400 | meters | Total DSR at GMT 21:00 |\n| `DSR_Quality` | | | | meters | Quality flag |\n| Bitmask for DSR_Quality - Bits 0-1: Input source of surface reflectance data - 0: no valid surface reflectance data - 1: from the MCD43 product - 2: from the climatology data ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n\nTerms of Use\n\n**Terms of Use**\n\nMODIS data and products acquired through the LP DAAC\nhave no restrictions on subsequent use, sale, or redistribution.\n\nCitations \nCitations:\n\n- Please visit [LP DAAC 'Citing Our Data' page](https://lpdaac.usgs.gov/citing_our_data)\n for information on citing LP DAAC datasets.\n\nDOIs\n\n- \u003chttps://doi.org/10.5067/MODIS/MCD18A1.062\u003e\n\nExplore with Earth Engine **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\nCode Editor (JavaScript) \n\n```javascript\nvar dataset = ee.ImageCollection('MODIS/062/MCD18A1')\n .filter(ee.Filter.date('2000-01-01', '2001-01-01'));\nvar gmt_1200_dsr = dataset.select('GMT_1200_DSR');\nvar gmt_1200_dsr_vis = {\n min: 0,\n max: 350,\n palette: ['0f17ff', 'b11406', 'f1ff23'],\n};\nMap.setCenter(6.746, 46.529, 2);\nMap.addLayer(\n gmt_1200_dsr, gmt_1200_dsr_vis,\n 'Total dsr at GMT 12:00');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/MODIS/MODIS_062_MCD18A1) \n[MCD18A1.062 Surface Radiation Daily/3-Hour](/earth-engine/datasets/catalog/MODIS_062_MCD18A1) \nThe MCD18A1 Version 6.2 is a Moderate Resolution Imaging Spectroradiometer (MODIS) Terra and Aqua combined Downward Shortwave Radiation (DSR) gridded Level 3 product produced daily at 1 kilometer pixel resolution with estimates of DSR every 3 hours. DSR is incident solar radiation over land surfaces in the shortwave spectrum (300-4,000 ... \nMODIS/062/MCD18A1, climate,par,radiation \n2000-03-03T00:00:00Z/2025-08-01T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/MODIS/MCD18A1.062](https://doi.org/https://lpdaac.usgs.gov/products/mcd18a1v062/)\n- [https://doi.org/10.5067/MODIS/MCD18A1.062](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_062_MCD18A1)"]]
