MCD18A1 Sürüm 6.1, 3 saatte bir DSR tahminleriyle birlikte 1 kilometrelik piksel çözünürlüğünde günlük olarak üretilen, Orta Çözünürlüklü Görüntüleme Spektroradyometresi (MODIS) Terra ve Aqua'nın birleştirilmiş Aşağı Yönlü Kısa Dalga Radyasyonu (DSR) ızgaralı Seviye 3 ürünüdür. DSR,kısa dalga spektrumundaki (300-4.000 nanometre) kara yüzeylerine gelen güneş radyasyonudur ve çeşitli bilimsel ve uygulama sorunlarını ele alan kara yüzeyi modellerinde önemli bir değişkendir. MCD18 ürünleri, yüzey yansıtma değerini elde etmek için MODIS verilerinin çok zamanlı imzalarını kullanan ve ardından arama tablosu (LUT) yaklaşımını kullanarak gelen DSR'yi hesaplayan bir prototip oluşturma algoritmasına dayanır. LUT'lar, çeşitli aydınlatma/görüntüleme geometrisinde farklı aerosol ve bulut yükleme türlerini dikkate alır. Küresel
DSR ürünleri, MODIS ve jeostatik uydu verilerinden oluşturulur.
Verileri oluşturmak için kullanılan yöntemle ilgili ek ayrıntılar Algoritmanın Teorik Temel Belgesi'nde yer almaktadır.
Bantlar
Piksel Boyutu 500 metre
Bantlar
Ad
Birimler
Min.
Maks.
Piksel Boyutu
Açıklama
DSR
W/m^2
0
1.400
metre
MODIS geçişinde anlık toplam DSR
Direct
W/m^2
0
1.400
metre
MODIS üst geçidinde anlık doğrudan DSR
Diffuse
W/m^2
0
1.400
metre
MODIS geçişinde anlık dağınık DSR
GMT_0000_DSR
W/m^2
0
1.400
metre
GMT 00:00'daki toplam DSR
GMT_0300_DSR
W/m^2
0
1.400
metre
GMT 03:00'teki toplam DSR
GMT_0600_DSR
W/m^2
0
1.400
metre
GMT 06:00'daki toplam DSR
GMT_0900_DSR
W/m^2
0
1.400
metre
GMT 09:00'daki toplam DSR
GMT_1200_DSR
W/m^2
0
1.400
metre
GMT 12:00'de toplam DSR
GMT_1500_DSR
W/m^2
0
1.400
metre
GMT 15:00'te toplam DSR
GMT_1800_DSR
W/m^2
0
1.400
metre
GMT 18:00'deki toplam DSR
GMT_2100_DSR
W/m^2
0
1.400
metre
GMT 21:00'de toplam DSR
DSR_Quality
metre
Kalite işareti
DSR_Quality için bit maskesi
Bit 0-1: Yüzey yansıtma verilerinin giriş kaynağı
0: Geçerli yüzey yansıtma verisi yok
1: MCD43 ürününden
2: Klimatoloji verilerinden
Kullanım Şartları
Kullanım Şartları
LP DAAC aracılığıyla edinilen MODIS verileri ve ürünleri, sonraki kullanım, satış veya yeniden dağıtım açısından herhangi bir kısıtlamaya tabi değildir.
MCD18A1 Sürüm 6.1, 3 saatte bir DSR tahminleriyle günlük olarak 1 kilometre piksel çözünürlüğünde üretilen, Orta Çözünürlüklü Görüntüleme Spektroradyometresi (MODIS) Terra ve Aqua'nın birleştirilmiş Aşağı Yönlü Kısa Dalga Radyasyonu (DSR) ızgaralı Seviye 3 ürünüdür. DSR,kısa dalga spektrumundaki (300-4.000 …
[null,null,[],[[["\u003cp\u003eMCD18A1 V6.1 provides daily, 1km resolution estimates of Downward Shortwave Radiation (DSR) over land, including instantaneous and 3-hour measurements.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is based on MODIS Terra and Aqua data, utilizing surface reflectance to calculate DSR using a look-up table approach that accounts for aerosols and clouds.\u003c/p\u003e\n"],["\u003cp\u003eIt covers the period from 2000-02-24 to 2024-06-01 and is superseded by V6.2, which is not yet available in Earth Engine.\u003c/p\u003e\n"],["\u003cp\u003eWhile it offers instantaneous and 3-hour DSR data, it is important to note that the V6.1 dataset is no longer being produced.\u003c/p\u003e\n"],["\u003cp\u003eUsers can explore and analyze the dataset within Google Earth Engine.\u003c/p\u003e\n"]]],["This dataset provides daily Downward Shortwave Radiation (DSR) data from the MODIS instrument, combining Terra and Aqua satellite measurements. It offers 3-hourly DSR estimates at a 1-kilometer resolution, covering land surfaces. The data spans from February 24, 2000, to June 1, 2024 and includes instantaneous, direct, diffuse DSR and total DSR at 3-hour intervals in Coordinated Universal Time. It is accessible through Earth Engine with the dataset ID MODIS/061/MCD18A1. Please note that this dataset has been superseded.\n"],null,["# MCD18A1.061 Surface Radiation Daily/3-Hour [deprecated]\n\n**Caution:** This dataset has been superseded by [MODIS/062/MCD18A1](/earth-engine/datasets/catalog/MODIS_062_MCD18A1). \n\nDataset Availability\n: 2000-02-24T00:00:00Z--2024-06-01T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://lpdaac.usgs.gov/products/mcd18a1v061/)\n\nCadence\n: 1 Day\n\nTags\n:\n climate \n par \nradiation \n\n#### Description\n\nThe MCD18A1 Version 6.1\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\n### Bands\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\n### Terms 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\n### Citations\n\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\n### DOIs\n\n- \u003chttps://doi.org/10.5067/MODIS/MCD18A1.061\u003e\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('MODIS/061/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_061_MCD18A1) \n[MCD18A1.061 Surface Radiation Daily/3-Hour \\[deprecated\\]](/earth-engine/datasets/catalog/MODIS_061_MCD18A1) \nThe MCD18A1 Version 6.1 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/061/MCD18A1, climate,par,radiation \n2000-02-24T00:00:00Z/2024-06-01T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/MODIS/MCD18A1.061](https://doi.org/https://lpdaac.usgs.gov/products/mcd18a1v061/)\n- [https://doi.org/10.5067/MODIS/MCD18A1.061](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MCD18A1)"]]
