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Quick overview of the services |
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of terminology ?
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Astronomy: Sun / Earth geometry
The relative positions of the Earth and the Sun vary during a year. The Sun is at zenith at noon solar time, but its elevation above the horizon changes from day to day for a same site. The same for the duration of the day. This service helps in answering these questions. It provides the position of the Sun in the sky.
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Solar Declination, Distance Earth to Sun, Difference True and Mean Solar Time. For each day, get solar declination, distance between the sun and the earth, and the difference between true solar time and mean solar time. Provider: MINES ParisTech / Armines (France). |
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Daylength - Sunrise and Sunset. For each day of a period, get daylength and time for sunrise and sunset. A graph displays the change in daylength during the period. Hours are given in true solar time, mean solar time and universal time (UT). Provider: MINES ParisTech / Armines (France). |
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Position of the Sun in the Sky (applet Java). This applet Java computes the location of the Sun (zenith, azimut) as a function of the latitude and day, in true solar time (12 h = zenith). Provider: MINES ParisTech / Armines (France). More information
Needs Java to be installed. If necessary, download a version of JAVA (JRE) on the web site of the company Sun. Download is automatic and takes 1 to 2 minutes. It may be not necessary to re-start the computer.
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Astronomy: Extraterrestrial and Top of Atmosphere radiation
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Extraterrestrial irradiance E0, also called extraterrestrial radiation. For each day of a period, provides the irradiance (W/m²) of a surface perpendicular to the sun rays, located at the limits of the atmosphere. It depends on the sun-earth distance, and thus on the date. Provider: MINES ParisTech / Armines (France). |
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Top of Atmosphere (ToA) Radiation received by a horizontal surface located at the top of atmosphere during a day. For each day of a period, provides the irradiance (W/m²) and irradiation (J/m², Wh/m²) of a horizontal surface located at the top of the atmosphere during that day and for a given site. Provider: MINES ParisTech / Armines (France). |
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Climate: Climatic averages over 15 and 30 years
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Monthly Averages of Air Temperature. Monthly averages (approx. 30 years) of air temperature resulting from interpolation of measurements made in meteorological networks. Provider: Meteotest, Switzerland. More information |
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Database of Climatic Data in Solar Radiation, Air Temperature and Relative Humidity. Monthly and yearly averages of solar radiation, air temperature (daily minimum, maximum and mean) and relative humidity (daily minimum, maximum and mean) averaged over the period 1990-2004 (15 years). Provider: MINES ParisTech / Armines, France. More information |
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Climate: Climatic normals (or typical values): radiation, temperature, UV
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Normal Year - Global Radiation and Air Temperature. Synthesized time-series (hourly, daily, monthly) of global radiation on horizontal or inclined planes and air temperature for normal years. Provider: Meteotest, Switzerland. More information |
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Typical Values for UV - World. Global and diffuse horizontal irradiance (irradiation) for UV-A, UV-B, erythemal. Worldwide. Typical values based on climatological data. Provider: Meteotest, Switzerland. More information |
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Climate: Degree-days
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Degree-Days Below a Given Temperature. For Europe. Provider: Ecole Nationale des Travaux Publics de l'Etat, France. More information |
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Degree-Days Above a Given Temperature. For Europe. Provider: Ecole Nationale des Travaux Publics de l'Etat, France. More information
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Climate: Frequency of types of skies
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Frequency of Types of Sky in Europe. This service provides monthly frequencies of three different sky types: sunny, intermediate and cloudy, for a period covering 1996 to 2000, for any site located in Western and Central Europe (source: Satel-Light). Provider: Ecole Nationale des Travaux Publics de l'Etat, France. More information |
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Climate: Typical values for clear skies - Linke turbidity factor
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Monthly Values of Linke Turbidity Factor (on a single geographical location). The Linke turbidity factor characterizes the optical turbidity of the atmosphere. Provider: Meteotest, Switzerland. More information |
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Monthly World Maps of Linke Turbidity Factor. Divide the values of the map by a factor 20 in order to get the correct Linke turbidity factor. More information |
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Simulation of Hourly Irradiation for One Clear-Sky Day. This service simulates the hourly and daily irradiations under clear skies for any geographical location, any day and any elevation. The clear sky is characterised by the Linke turbidity factor, an input to the simulator. The receiving plane may be horizontal or inclined. Provider: MINES ParisTech / Armines, France. More information |
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Energy: Optimal panel orientation
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Slope leading to maximum total irradiation. For any site in Europe, this service provides the slope of an inclined surface receiving the maximum of radiation. No mask taken into account. Provider: Ecole Nationale des Travaux Publics de l'Etat, France. More information |
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Energy: Performance of a solar water heater
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Averaged Yearly Performance of a Solar Water Heater. This service gives a rapid estimate of the annual energy output of a solar water heater for any geographical location in Europe. Provider: MINES ParisTech / Armines, France. More information |
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Energy: Daylighting
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Potential of Daylight in a Room. SODALIGHT, a service to evaluate the potential of daylight in a room that you design yourself. Provider: Ecole Nationale des Travaux Publics de l'Etat, France. More information |
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Environment: Photosynthesis in the ocean
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Time-series of Photosynthetically Available Radiation (PAR) at sub-surface. Use the HelioClim-1 database containing daily values. Provider: MINES ParisTech / Armines, France. More information |
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Vertical profile of PAR for a day. Use the HelioClim-1 database containing daily values. Provider: MINES ParisTech / Armines, France. More information |
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Geography: Coordinates of a city
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Find the geographical coordinates of any city. This service exploits the geographical gazetteer, i.e., a set of names of cities worldwide with their geographical coordinates. This is a revised version of the database of the USA National Geo-intelligence Agency, available at GeoNet Names Server. Provider : MINES ParisTech / Armines (France). |
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Meteorology: Weather forecasts
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Europe - Grid size 21 km. This service provides forecasts of several meteorological parameters, including radiation components, for 3 days every 3-hours. Provider: ISAC-CNR, DIFI, CMIRL (Italy). More information
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italy-centered region - Grid size 10 km. This service provides forecasts of several meteorological parameters, including radiation components, for 3 days every 3-hours. Provider: ISAC-CNR, DIFI, CMIRL (Italy). More information
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World. This service provides forecasts of several meteorological parameters at surface: wind, air pressure, temperature, relative humidity, precipitation, and irradiances, for 3 days every 3-hours. Provider: National Centers for Environmental Prediction, NOAA (USA). More information
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Meteorology: UV and spectral distribution
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UV from HelioClim-1. Daily Values of UV Radiation - Europe - Africa. This service uses the spectral irradiation model defined by the Belgian Meteorological Office and reported in ESRA (vol 2, page 158), applied to the HelioClim-1 database. Period 1985-2005. Provider: MINES ParisTech / Armines (France). More information |
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Solar radiation data: on a horizontal surface
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HelioClim-1. Database of Solar Radiation - Day to Month - Europe - Africa. Irradiance values from the database HelioClim-1, computed from images of the Meteosat satellites, from 1985 to 2005. Provider: MINES ParisTech / Armines (France). More information
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HelioClim-2. not available anymore. |
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HelioClim-3. Database of Solar Radiation - Minute to Month - Europe - Africa. Irradiance values from the database HelioClim-3, computed from images of the Meteosat satellites since February 2004. Provider: MINES ParisTech / Armines (France). More information
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MARS:. not available anymore |
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NASA-SSE. Database of Solar Radiation - World. This resource provides time-series of daily irradiation from July 1st 1983 to June 30th 2005 for cells of 1 degree by 1 degree. Provider: NASA (USA). More information |
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NASA-SSE + HelioClim-1. Get the Best of the NASA SSE and HelioClim Databases of Solar Radiation - World. This service provides time-series of daily irradiation from July 1st 1983 to December 31st 1993. It automatically selects the database offering the best quality for the selected site. Provider: NASA (USA) and MINES ParisTech / Armines (France). |
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Solar radiation data: on an inclined surface
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HelioClim-2. not available anymore. |
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HelioClim-3. Values of Solar Radiation on Inclined and Horizontal Plane - Minute to Month - Europe - Africa. Time-series of values of radiation on inclined and horizontal plane for direct, diffuse and reflected components. The time-series are created from values of the database HelioClim-3. Since February 2004. Provider: MINES ParisTech / Armines (France). More information |
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Solar radiation data: on a surface normal to sun rays (DNI)
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HelioClim-2. not available anymore. |
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HelioClim-3. Values of Solar Radiation with Normal Incidence - Minute to Year - Europe - Africa. Radiation received by a mobile plane constantly facing the sun created from values of the database HelioClim-3. Since February 2004. Provider: MINES ParisTech / Armines (France). More information |
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Units - Converter
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Sexagesimal Degrees into Decimal Degrees. Geographical coordinates are often given in sexagesimal degrees, i.e., in degrees, minutes and seconds (ex: 45° 30 min). However, computers are more familar with decimal numbers and it is necessary to convert the sexagesimal degrees into degrees with decimals (i.e. 45.5°).
General Formulation: latitude (degrees) = degrees + (minutes / 60) + (seconds / 3600)
Example: if lat = 45° 53' 36" (45 degrees, 53 minutes and 36 seconds), then: latitude = 45 + (53 / 60) + (36 / 3600) = 45.89
Provider : MINES ParisTech / Armines (France). |
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Last update: 1/16/12 6:15 PM