Benchmarking

Benchmarking is the largest activity within the MESoR project. The aim of the benchmarking exercise is to establish a coherent set of benchmarking rules and reference data sets to enable …

Analysed databases and integrated systems

Each of the databases analysed here is integrated within a system (software setup) that provides additional tools for search, query, maps display, and calculation of derived parameters. PVGIS (the European …

Linke’s Turbidity Factor Applied to Worldwide Global. Horizontal Irradiance Measurements

Frank Bason SolData Instruments, Linabakken 13, DK-8600 Silkeborg, DenmarkCorresponding Author, soldata@soldata. dk Abstract The data collection phase of the Danish Galathea III Expedition was conducted from August 2006 until April …

Data base and compare

1.1. Information of stations The global solar radiation and sunshine duration data during the period from 1994 to 2003 reported in this paper were provided by the China Meteorological Administration …

Study Area

The region of the study is the area of Andalusia, in the southern part of Iberian Peninsula (Figure 1), covering around 87.000 km2. The region is located in the transition …

Direct Normal Irradiance from Satellite VIS Images

The calculation of the direct normal irradiance is performed in different steps. In a first step cloud information is derived from the satellite measurements using an enhanced version of the …

Reference data

This activity focuses on collection of high quality ground measurements which can be used as a reference in the benchmarking exercises. The measurements should be conducted with high accuracy, high …

Point analysis

The maps give good insight into regional differences, however due to the coarse grid resolution (5 arc minutes) they smooth out local effects. Some of the integrated systems incorporate specific …

The Galathea Expedition

1.1. Research platform The Danish King Christian VIII sent the first Galathea Expedition to the Far East in 1845-1847. The second Galathea Expedition took place 100 years later from 1950-1952, …

Comparative models

The results of this proposed model are compared with three other previously reported models which are believed to be applicable anywhere in the world and yield superior results for cloudy …

External explanatory variables for the residual kriging

In this work, we have only considered explanatory variables that can be derived from DEM. This makes the results more general and useful, since these variables are readily available elsewhere. …

Heliosat Method

The Heliosat method is a technique of determining the global radiation at the ground by using data from a geostationary satellite. In the Heliosat method it is assumed that the …

Benchmarking measures and rules

Benchmarking of solar radiation products can be done in different ways. If a kind of reference data is available which is assumed to be the “truth”, the modelled data sets …

Solar radiation forecasting with WRF model in the Iberian Peninsula

L. Martin1*, E. Lorenz2, A. Sood2, L. F. Zarzalejo1, K. Suselj2,J. Polo1, A. Navarro1, R. Marchante3 1 CIEMAT, Department of Energy, Av. Complutense n°22, Madrid, 28040, Spain2 Oldenburg University, Germany …

Parameters measured

The SolData optics table was equipped to measure: global irradiance (3 instruments), ultraviolet B (UVB), illuminance (lux), barometric pressure (hPa), background radiation (counts/10 min), sky luminance (cd/m2) and PAR (einstein/m2). …

Equation developed in this study

Chen zhi-jun has quoted four statistical methods [5] to explain the data characteristic which are based on the monthly data of single station or based on the whole year data …

Regression analysis

A multiple regression analysis was carried out independently for each month using the elevation and the semi-sky-view factor as independent explanatory variables. A step-wise procedure was used for the regression …

Standardization

The satellite measures the sunlight in the visible spectral region reflected by the earth. Hence the measurement signal depends on the irradiation hitting the reflecting layers. After subtraction of the …

User guide of best practices

User guidance is one of the main objectives of the MESoR project. This will be realized by the development of a guide of best practices in the application of solar …

Simplified global irradiance model

We have shown in earlier work how a simplified model can be used to achieve a good fit to the global irrad - iance data [2]. The following expression shows …

Estimation of solar resource map at Galicia by using self-learning techniques

Alberto Pettazzi, Jose Antonio Souto Gonzalez* Department of Chemical Engineering, University of Santiago de Compostela, Lope Gomez de Marzoa St., Campus Sur. 15782 Santiago de Compostela, SpainCorresponding author, ja. souto@usc. …

Models evaluation

The ordinary and residual kriging models were obtained based on the training dataset. After that, the validation dataset were used to evaluate these models. Particularly, model estimates were evaluates in …

Reference values for ground reflectivity

In order to calculate the ground reflectivity pg, in an iterative procedure values larger than the mean value of the distribution plus ag are filtered out, until convergence is achieved. …

Unifying Access

The second major objective of the MESoR project is to unify and ease access to solar resource information. This builds upon experiences made within the SoDa portal, adopting mapping features …

Young have developed a good, practical formula which is well suited for use with small solar elevation angles [8]

. _ ms ga а gtnv-i (2) _ з tк* V 4 sin^V-t (S. ffiLGS 9&a ri tT V 4 GJGGCaca? This equation approaches the simple expression 1/sin V asymptotically …

Materials and Methods

The meteorological and climatic features of Galicia are monitored by a network made up by 93 weather stations, located all over the region covering the usual meteorological parameters. Ten - …

Ordinary kriging model evaluation

Validation dataset results showed, overall, that the ordinary kriging is able to provide fair estimates. Error values present a seasonal pattern: the summer months shows the lowest RMSE values (in …

Reference values for cloud reflectivity

The cloud reflectivity pc also depends on the sun-satellite geometry. Therefore, different values of pc are calculated using histograms of reflectivity values for classes with similar geometric configurations. Fig. 2 …

Solar radiation forecasting with non-lineal statistical techniques and. qualitative predictions from Spanish National Weather Service

L. Martin1*, L. F. Zarzalejo1, J. Polo1, A. Navarro1, R. Marchante2 1 CIEMAT, Department of Energy, Av. Complutense n°22, Madrid, 28040, Spain 2 IrSOLaV, Calle Santiago Grisolia (PTM) 2, Tres …

USING NWP MODELS FOR SOLAR RADIATION ESTIMATES. IN A COMPLEX-TOPOGRAPHY AREA IN SOUTHEASTERN SPAIN

D. Pozo-Vazquez1*, V Lara-Fanego1, H. Al-Samamra1, J. A. Ruiz-Arias1, A. Molina2 and J. Tovar-Pescador1 1 MATRAS Group, Department of Physics, 2 Department of Computer SciencesUniversity of Jaen, Campus Lagunillas, 23071, …

Global Irradiation

Fig. 2 shows the annual mean values of global irradiation recorded during 2006 and 2007. The zones with the highest values of irradiation (greater than 14 MJ m-2 day-1) are …

Residual kriging model evaluation

Again, as for the ordinary kriging, a seasonal pattern is present, with the summer months showing the lowest RMSE values and the winter months the highest ones. Particularly, lowest RMSE …

. Relation between cloud index and clear sky index

The clear sky index is an appropriate and thus an established quantity for the description of the transmission properties of the Earth's atmosphere. It is defined by k* = Ig …

Solar Radiation Dataset

The dataset used in this study is based on pyranometric global solar irradiance ground measurements which belongs to stations of the Spanish National Radiometric Network from Agencia Espanola de Meteorologia …

Study area and observations

This study has been conducted within the Natural Park of Sierra Magina, in Southern Spain (37.6° N, 3.4° W) (Fig. 1). The area has a rough extension of 30 km …

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