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Federico Vladimir Gutierrez Corea, Miguel Ángel Manso Callejo, Pilar Moreno Regidor, Jesús Velasco Gómez

    Tipo: Revistas
    Año: 2014
    Titulo: Spatial Estimation of Sub-Hour Global Horizontal Irradiance Based on Official Observations and Remote Sensors
    Editorial: Sensors

This study was motivated by the need to improve densification of Global Horizontal Irradiance (GHI) observations, increasing the number of surface weather stations that observe it, using sensors with a sub-hour periodicity and examining the methods of spatial GHI estimation (by interpolation) with that periodicity in other locations. The aim of the present research project is to analyze the goodness of 15-minute GHI spatial estimations for five methods in the territory of Spain (three geo-statistical interpolation methods, one deterministic method and the HelioSat2 method, which is based on satellite images). The research concludes that, when the work area has adequate station density, the best method for estimating GHI every 15 min is Regression Kriging interpolation using GHI estimated from satellite images as one of the input variables. On the contrary, when station density is low, the best method is estimating GHI directly from satellite images. A comparison between the GHI observed by volunteer stations and the estimation model applied concludes that 67% of the volunteer stations analyzed present values within the margin of error (average of +-2 standard deviations)

Federico Vladimir Gutierrez Corea, Miguel Ángel Manso Callejo, Antonio Vázquez Hoehne

    Tipo: Revistas
    Año: 2013
    Titulo: Assessment of the availability of near-real time open weather data provided by networks of surface stations in Spain
    Editorial: Earth Science Informatics (ESIN)

The aims of this research are: (i) to check availability of weather observations from automated stations in Spain, (ii) to qualitatively and quantitatively describe the networks identified, (iii) to analyze availability of the observations gathered for 3 different networks [two government (GOV): AEMET with national coverage and CASTILLA Y LEÓN on a regional level; and METEOCLIMATIC, a network of volunteer weather observation (VWO) stations on a national level], and (iv) to undertake a spatial redundancy and lacunarity analysis of them. The results reveal: the existence of heterogeneous VWO networks complementing the GOV, differences within and among networks as far as data acquisition frequency, varying delays in their publication, and semantic differences in the observations made. An inventory was made of 24 networks (16 GOV and 8 VWO) with 3,908 stations deployed in Spain. An analysis of observations from 3 networks reveals that 88 % of the stations in the volunteer network record more than two observations per hour. 56 % of the AEMET stations report more than 48 observations every day, 31 % report between 25 and 48 observations a day. Conversely, the CASTILLA Y LEÓN network records data every half hour. The redundancy analysis reveals a 3,429-drop in the number of unduplicated stations. Following the lacunarity analysis of spatial distribution, it is possible to conclude that 60.72 % of the cells do not contain any stations.

Carlos López Vázquez, Miguel Ángel Manso Callejo

    Tipo: Revistas
    Año: 2013
    Titulo: Point- and curve-based geometric conflation
    Editorial: International Journal of Geographical Information Science

Geometric conflation is the process undertaken to modify the coordinates of features in dataset A in order to match corresponding ones in dataset B. The overwhelming majority of the literature considers the use of points as features to define the transformation. In this article we present a procedure to consider one-dimensional curves also, which are commonly available as Global Navigation Satellite System (GNSS) tracks, routes, coastlines, and so on, in order to define the estimate of the displacements to be applied to each object in A. The procedure involves three steps, including the partial matching of corresponding curves, the computation of some analytical expression, and the addition of a correction term in order to satisfy basic cartographic rules. A numerical example is presented.

Jesús García López de Lacalle, Miguel Ángel Manso Callejo, Pilar Moreno Regidor

    Tipo: Revistas
    Año: 2012
    Titulo: Zone design of specific sizes using adaptive additively weighted Voronoi diagrams
    Editorial: International Journal of Geographical Information Science

Territory or zone design processes entail partitioning a geographic space, organized as a set of areal units, into different regions or zones according to a specific set of criteria that are dependent on the application context. In most cases, the aim is to create zones of approximately equal sizes (zones with equal numbers of inhabitants, same average sales, etc.). However, some of the new applications that have emerged, particularly in the context of sustainable development policies, are aimed at defining zones of a predetermined, though not necessarily similar, size. In addition, the zones should be built around a given set of seeds. This type of partitioning has not been sufficiently researched; therefore, there are no known approaches for automated zone delimitation. This study proposes a new method based on a discrete version of the adaptive additively weighted Voronoi diagram that makes it possible to partition a two-dimensional space into zones of specific sizes, taking both the position and the weight of each seed into account. The method consists of repeatedly solving a traditional additively weighted Voronoi diagram, so that each seed's weight is updated at every iteration. The zones are geographically connected using a metric based on the shortest path. Tests conducted on the extensive farming system of three municipalities in Castile-La Mancha (Spain) have established that the proposed heuristic procedure is valid for solving this type of partitioning problem. Nevertheless, these tests confirmed that the given seed position determines the spatial configuration the method must solve and this may have a great impact on the resulting partition.

Federico Vladimir Gutierrez Corea, Miguel Ángel Manso Callejo, Francisco Javier Moreno Marimbaldo

    Tipo: Comunicaciones
    Año: 2012
    Titulo: Using 3D GeoDesign for Planning of new Electricity Networks in Spain
    Editorial: Lecture Notes in Computer Science LNCS Vol 7333

Power supply plays a fundamental role in society to boost development in some nations and maintain the standard of living in others. The development of an electricity transmission network involves the planning of a new infrastructure and subsequent construction which entails the creation of new conditions in the territory. This article proposes a new workflow in which the GeoDesign principles are applied, so that the actors share their interests and work together to develop a new electrical infrastructure and thus achieve the planned objectives. We present a consistent method to describe the context, requirement analysis, identification of constraints and relationship stages, a proposed workflow, a web-based GeoDesign tool prototype and tools for 3D visualisation and GoogleEarth interaction as well as other tools to generate reports for administration processing. The first available results related to GeoDesign in administration processing are encouraging in terms of productivity growth and costs and timeframes reduction

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