The movement that shares geo-referenced data is known as Volunteer Geographic Information (VGI). According to [19], VGI emerged as a form of Web 2.0. WikiMapia [20] and OpenStreetMap [21] are good examples of VGI [22]. Over the past few years, several studies have been undertaken in order to assess the quality of VGI data [22�C26], a fact that points to a latent interest in the usefulness of this type of information. This movement is also active in the field of meteorology, in which volunteers assign a location and other metadata to their stations, albeit with the added particularity that in VWO surface stations automatically record weather observations, whereas this does not occur with the VGI movement but is rather part of what is known as passive crowd sourcing [27,28].
The aim of the present research project is to identify the best method for estimating 15-minute GHI in Spain based on interpolations applied to observations from two official station networks and contemplating the best way to group stations in the study area. A practical application of the research objective has been to compare GHI observations made by volunteer stations (Meteoclimatic) with the estimation model applied; this was done in order to identify those within the margin of error (average of ��2 standard deviations).The remainder of article is structured as follow: Section 2, ��Study Area and Source of Data�� describes the geographical area in which this study is applied and also gives general information of the Data Sources. Section 3, ��Methodology�� describes the steps used to gather and grouping all data from different characteristics.
The interpolation methods used and the validation criteria applied to the WVO stations. Section 4, ��Results and Discussion�� presents the results of all the prediction methods and provides an analysis Dacomitinib of the winning ones and relates them to previous studies. Then, in this section is shown how these selected methods are applied for the validation of the VWO stations and the percentages of VWO labeled as possibly valid. The ��Conclusion�� section 5 presents key findings. The article ends with a section on ��Future Works��.2.?Study Area and Source of Data2.1. Study AreaThe geographic area encompassed by the current study includes mainland Spain and the Balearic archipelago. It comprises an area covering 497,167 km2 (492,175 + 4,992) km2, and includes 16 of the 17 Spanish regions, and excludes the Canary Islands an
Wireless sensor networks (WSNs) consist of thousands of sensors that collect data from a certain deployed range. Currently, WSNs have plenty of applications, such as military investigation, environment monitoring and accident reporting, etc.
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