تم تطوير قاعدة بيانات ASTER-GED العالمية للانبعاثات الحرارية والانعكاسات المتقدّمة المحمولة جوًا، وذلك من قِبل مختبر الدفع النفاث (JPL) التابع للإدارة الوطنية للملاحة الجوية والفضاء (NASA) في معهد كاليفورنيا للتكنولوجيا. يتضمّن هذا المنتج متوسط الانبعاثية والانحراف المعياري لجميع نطاقات الأشعة تحت الحمراء الحرارية الخمسة في ASTER، ومتوسط درجة حرارة سطح الأرض (LST) والانحراف المعياري، وعيّنة مُعاد أخذها من ASTER GDEM، وقناع الأرض والمياه، ومتوسط مؤشر الاختلاف النباتي القياسي (NDVI) والانحراف المعياري، وعدد الملاحظات.
يتم إنشاء درجة حرارة سطح الأرض والانبعاثية (LST&E) من ASTER-GED
باستخدام خوارزمية فصل درجة الحرارة والانبعاثية (TES) من ASTER
بالإضافة إلى طريقة تصحيح الغلاف الجوي باستخدام مقياس بخار الماء (WVS)
باستخدام ملفات تعريف الغلاف الجوي MOD07 من MODIS ونموذج نقل الإشعاع MODTRAN 5.2.
تم استخلاص هذا المنتج من وحدات البكسل الخاصة بالسماء الصافية لجميع بيانات ASTER المتاحة (2000-2008).
لا تخضع بيانات ومنتجات ASTER التي يوزّعها مركز LP DAAC لأي قيود على استخدام البيانات أو بيعها أو إعادة توزيعها لاحقًا، باستثناء مجموعة بيانات ASTER Global Digital Elevation Model (GDEM) الإصدار 2 (v2).
لمزيد من المعلومات، يُرجى الانتقال إلى موقع سياسات ASTER.
تم تطوير قاعدة بيانات ASTER-GED العالمية للانبعاثات الحرارية والانعكاسات بواسطة مختبر الدفع النفاث (JPL) التابع للإدارة الوطنية للملاحة الجوية والفضاء (NASA) في معهد كاليفورنيا للتكنولوجيا. يتضمّن هذا المنتج متوسط الانبعاثية والانحراف المعياري لجميع نطاقات الأشعة تحت الحمراء الحرارية الخمسة في ASTER، ومتوسط درجة حرارة سطح الأرض …
[null,null,[],[[["\u003cp\u003eThe ASTER Global Emissivity Database (ASTER-GED) provides land surface temperature and emissivity data derived from ASTER satellite imagery.\u003c/p\u003e\n"],["\u003cp\u003eIt includes mean and standard deviation for emissivity in 5 thermal infrared bands, land surface temperature, NDVI, and elevation.\u003c/p\u003e\n"],["\u003cp\u003eCovering the period from 2000 to 2008, the dataset was developed by NASA JPL and is available at a 100-meter resolution.\u003c/p\u003e\n"],["\u003cp\u003eASTER-GED data and products (excluding ASTER GDEM v2) have no restrictions on use, sale, or redistribution.\u003c/p\u003e\n"],["\u003cp\u003eUsers can explore and analyze the ASTER-GED dataset using Google Earth Engine.\u003c/p\u003e\n"]]],["The ASTER Global Emissivity Database (ASTER-GED), provided by NASA's JPL, offers data from 2000 to 2008. It contains mean emissivity and standard deviation for five thermal infrared bands, mean land surface temperature (LST), NDVI, and elevation data at 100-meter pixel resolution. The dataset was generated using the ASTER Temperature Emissivity Separation (TES) algorithm. Additional data include a land-water map, observation count, and users can access it via Google Earth Engine. There are no restrictions on its usage.\n"],null,["# AG100: ASTER Global Emissivity Dataset 100-meter V003\n\nDataset Availability\n: 2000-01-01T00:00:00Z--2008-12-31T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/COMMUNITY/ASTER_GED/AG100.003)\n\nTags\n:\n [aster](/earth-engine/datasets/tags/aster) [elevation](/earth-engine/datasets/tags/elevation) [emissivity](/earth-engine/datasets/tags/emissivity) [geophysical](/earth-engine/datasets/tags/geophysical) [infrared](/earth-engine/datasets/tags/infrared) [jpl](/earth-engine/datasets/tags/jpl) [lst](/earth-engine/datasets/tags/lst) [nasa](/earth-engine/datasets/tags/nasa) [ndvi](/earth-engine/datasets/tags/ndvi) [satellite-imagery](/earth-engine/datasets/tags/satellite-imagery) [temperature](/earth-engine/datasets/tags/temperature) [thermal](/earth-engine/datasets/tags/thermal) \n caltech \nged \n\n#### Description\n\nThe Advanced Spaceborne Thermal Emission and Reflection Radiometer Global\nEmissivity Database (ASTER-GED) was developed by the National Aeronautics\nand Space Administration's (NASA) Jet Propulsion Laboratory (JPL),\nCalifornia Institute of Technology. This product includes the mean\nemissivity and standard deviation for all 5 ASTER Thermal Infrared bands,\nmean land surface temperature (LST) and standard deviation, a re-sampled\nASTER GDEM, land-water mask, mean Normalized Difference Vegetation Index\n(NDVI) and standard deviation, and observation count.\n\nASTER-GED land surface temperature and emissivity (LST\\&E) are generated\nusing the ASTER Temperature Emissivity Separation (TES) algorithm in\ncombination with a Water Vapor Scaling (WVS) atmospheric correction method\nusing MODIS MOD07 atmospheric profiles and the MODTRAN 5.2 radiative\ntransfer model.\n\nThis product was derived from clear-sky pixels for all available ASTER data\n(2000-2008).\n\n[User's Guide](https://lpdaac.usgs.gov/documents/120/ASTERGED_User_Guide_V3.pdf)\n\n### Bands\n\n\n**Pixel Size**\n\n100 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Scale | Pixel Size | Description |\n|--------------------------|------------------|-------|-------|--------|------------|-------------------------------------------|\n| `emissivity_band10` | | 0 | 1000 | 0.001 | meters | Mean band 10 |\n| `emissivity_band11` | | 0 | 1000 | 0.001 | meters | Mean band 11 |\n| `emissivity_band12` | | 0 | 1000 | 0.001 | meters | Mean band 12 |\n| `emissivity_band13` | | 0 | 1000 | 0.001 | meters | Mean band 13 |\n| `emissivity_band14` | | 0 | 1000 | 0.001 | meters | Mean band 14 |\n| `emissivity_sdev_band10` | | -1000 | 1000 | 0.0001 | meters | Standard deviation band 10 |\n| `emissivity_sdev_band11` | | -1000 | 1000 | 0.0001 | meters | Standard deviation band 11 |\n| `emissivity_sdev_band12` | | -1000 | 1000 | 0.0001 | meters | Standard deviation band 12 |\n| `emissivity_sdev_band13` | | -1000 | 1000 | 0.0001 | meters | Standard deviation band 13 |\n| `emissivity_sdev_band14` | | -1000 | 1000 | 0.0001 | meters | Standard deviation band 14 |\n| `temperature` | K | 0 | 65535 | 0.01 | meters | Temperature mean |\n| `temperature_sdev` | K | 0 | 65535 | 0.01 | meters | Temperature standard deviation |\n| `ndvi` | | 0 | 100 | 0.01 | meters | NDVI mean |\n| `ndvi_sdev` | | 0 | 100 | 0.01 | meters | NDVI standard deviation |\n| `elevation` | m | -500 | 9000 | | meters | ASTER Global Digital Elevation Model V002 |\n| `land_water_map` | | | | | meters | Land water map |\n| `num_obs` | Number per pixel | 0\\* | 120\\* | | meters | Number of observations |\n\n\\* estimated min or max value\n\n**land_water_map Class Table**\n\n| Value | Color | Description |\n|-------|-------|-------------|\n| 1 | brown | Land |\n| 2 | blue | Water |\n\n### Terms of Use\n\n**Terms of Use**\n\nASTER data and products distributed by the LP DAAC, with the exception of\nthe ASTER Global Digital Elevation Model (GDEM) dataset (ASTGTM) version 2\n(v2), have no restrictions on data use, sale, or subsequent redistribution.\nFor more information visit the\n[ASTER Policies](https://lpdaac.usgs.gov/data/data-citation-and-policies/) site.\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/COMMUNITY/ASTER_GED/AG100.003\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.Image('NASA/ASTER_GED/AG100_003');\nvar elevation = dataset.select('elevation');\nvar elevationVis = {\n min: -15.0,\n max: 5000.0,\n palette: [\n '0602ff', '235cb1', '307ef3', '269db1', '30c8e2', '32d3ef', '3ae237',\n 'b5e22e', 'd6e21f', 'fff705', 'ffd611', 'ffb613', 'ff8b13', 'ff6e08',\n 'ff500d', 'ff0000', 'de0101', 'c21301'\n ],\n};\nMap.setCenter(89.12, 37.72, 3);\nMap.addLayer(elevation, elevationVis, 'Elevation');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_ASTER_GED_AG100_003) \n[AG100: ASTER Global Emissivity Dataset 100-meter V003](/earth-engine/datasets/catalog/NASA_ASTER_GED_AG100_003) \nThe Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Emissivity Database (ASTER-GED) was developed by the National Aeronautics and Space Administration's (NASA) Jet Propulsion Laboratory (JPL), California Institute of Technology. This product includes the mean emissivity and standard deviation for all 5 ASTER Thermal Infrared bands, mean land surface temperature ... \nNASA/ASTER_GED/AG100_003, aster,elevation,emissivity,geophysical,infrared,jpl,lst,nasa,ndvi,satellite-imagery,temperature,thermal \n2000-01-01T00:00:00Z/2008-12-31T00:00:00Z \n-59 -180 80 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/COMMUNITY/ASTER_GED/AG100.003](https://doi.org/https://doi.org/10.5067/COMMUNITY/ASTER_GED/AG100.003)\n- [https://doi.org/10.5067/COMMUNITY/ASTER_GED/AG100.003](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_ASTER_GED_AG100_003)"]]
