Panos Lolonis - Academia.edu (original) (raw)

Papers by Panos Lolonis

Este articulo describe un metodo estadistico que se puede emplear para determinar si das o mas ma... more Este articulo describe un metodo estadistico que se puede emplear para determinar si das o mas mapas, que se han hecho en levantamientos distintos e independientes y que cubren a areas adyacentes, ajustan satisfactoriamente entre si. A menudo, esta situacion se presenta cuando areas adyacentes son cartografiadas por topografos diferentes, o en momentos distintos o empleando distintos conjuntos de mediciones para el control geodesico. El metodo estadistico se basa en la comparacion de las diferencias de coordenadas de algunos puntos que se pueden identificar bien en los pares de mapas (o diagramas) adyacentes. Estas diferencias se emplean para calcular una estadistica que sea adecuada para determinar si el conjunto de las diferencias observadas en las coordenadas puede o no atribuirse a errores aleatorios. Se demuestra que la estadistica sigue una distribucion x2 y es, por tanto, susceptible de ser tratada por los metodos estadisticos estandar. Se demuestra tambien el uso del metodo ...

This paper examines the trends that are observed in land transactions in certain areas of Greece ... more This paper examines the trends that are observed in land transactions in certain areas of Greece that have a cadastral system in operation during the past eight years. Those trends seem to be a resultant of the economic crisis which has hit the country and the legislative changes that have taken place prior or during the crisis. In particular, it was anticipated that the economic crisis has had a significant effect in land transactions due to the drastic decrease of available funds (e.g. available income, available loans etc), the extreme increase of uncertainty and risk in the Greek economy, and the increase in the cost of possessing land (The Greek Government, in an effort to reduce its public deficit has increased taxes on land). In addition, the Greek Government, in an effort to protect natural resources, curtail illegal construction, reduce unauthorized uses on properties and promote environmentally friendly structures throughout the country, has adopted a series of legislation...

Topografia Y Cartografia Revista Del Ilustre Colegio Oficial De Ingenieros Tecnicos En Topografia, 2003

SUMMARY This paper describes the major technologies and management approaches that have been adop... more SUMMARY This paper describes the major technologies and management approaches that have been adopted recently in the Hellenic Cadastre to facilitate the data collection and validation procedures. Indeed, in an effort to ensure that the selected data will have a specified quality level, reduce the risks involved in carrying-out large scale cadastral surveys and reduce the data collection and validation costs, Ktimatologio S.A., the agency responsible for the development of the Hellenic Cadastre, has adopted a wide range of state-of-the-art technologies, such as, permanent GPS stations, high-tech aerial photography and Web-based services, to achieve those goals. All these technologies are integrated appropriately to support the implementation of a series of large-scale projects that aim to develop a spatial data infrastructure for developing the Hellenic Cadastre. The paper will describe the set of those projects and will explain the philosophy that underlies them. Also, the paper wil...

This paper investigates the potential usefulness of cadastral data to form the core part of datab... more This paper investigates the potential usefulness of cadastral data to form the core part of databases of Spatial Decision Support Systems [SDSS] that are capable to support decision-makers in dealing with emergency situations, such as earthquakes, floods and fires. Particular emphasis is given on how those data can be used to generate information that is necessary to planners and decision-makers when they cope with natural disasters at every stage of the development of the disaster: before the occurrence (planning and preventive measures), immediately after occurrence (short term measures), and well-after occurrence (medium and long term measures). This investigation is conducted using the Municipality of Magoula, Attica, Greece, as a case study area. This municipality is situated in the greater Athens area and was struck by the earthquake that occurred there in September 1999. Within the scope of the project, wehave used cadastral data about the study area and data recorded by the ...

Geographic information system technology is now being placed in the hands of decision-makers who ... more Geographic information system technology is now being placed in the hands of decision-makers who often have little or no cartographic training. Although it is possible that these users will glean insight from the displays that they generate, map readers are able to

Spatial decision support systems enable decision-makers to analyze complex locational problems. W... more Spatial decision support systems enable decision-makers to analyze complex locational problems. When such systems are used, problems often undergo reconceptualization as the effects of altering criteria and model specifications become known. Model results, however, must be placed in a geographical context for decision makers to understand key spatial relationships among components of their problem. Several distinct tasks typically must be accomplished during locational decision-making, and the interface presented to the user must adapt to different display requirements. Decision-makers also must be allowed to interactively visualize the effects of making adjustments to parameters in the solution space. We present a model of an interface that relies on the establishment of linkages between database entities and displays to support visualization requirements.

Statistics in Medicine, 1996

Are birth defect rates unusually high in particular urban localities? The answer requires that th... more Are birth defect rates unusually high in particular urban localities? The answer requires that the birth defect rate for which 'significance' is claimed be adjusted for the variable population sizes of each area for which the rate is computed and for the spatial dependence of rates based on shared observations between neighboring areas. By address-matching birth and birth defect records to a digital road map, we are able to compute local birth defect rates at regular grid locations by dividing the number of birth defects that occurred in the geographical vicinity of a grid location by the total number of births in the same vicinity. We test for significance, at regular spatial intervals, against the null hypothesis that the observed rate at any locality could reasonably have arisen by chance alone, given the underlying geographical variation in births. Significance is determined by using Monte Carlo simulations, where each birth location has an identical probability of being a defect. From 1000 simulations, a statistical distribution of the birth defect rate for each grid location is determined. The proportion of the simulated birth defect rates that are less than the observed rate at any grid location is the probability that the observed rate is significant. These probabilities, portrayed as isarithmic maps, show areas that have significantly high birth defect rates. Our results show birth defect rates for the period 1983 to 1990 in Des Moines, Iowa, U.S.A.

Socio-Economic Planning Sciences, 1995

This paper describes a new method for making short-term (4-8 yr) student enrollment projections b... more This paper describes a new method for making short-term (4-8 yr) student enrollment projections by grade and ethnic group for small geographic areas. The method links an information system that contains student characteristics and home addresses with a commonly available digital geographic database (TIGER) to create a geographic accounting table of student residences by census blocks. Progression rates of students from one grade to the next are estimated for each small area by aggregating student residences, by grade, for a 3 yr period over a larger area (the modifiable spatial filter) centered on the small area. The size of the filter area depends on the geographical distribution of students, a user-specified student threshold value, and a maximum distance constraint. The progression rates are applied to the student population of each census block in a grade-cohort component projection model. Projections of the number of students enrolled in each grade for any defined geographical area are made by aggregating the projections for the census blocks in the area. We show that results using this method are consistent with those from the same model applied to school attendance area enrollment data, whereas results using the small-area data without the filter are not. This result supports our conclusion that the method is reliable for making grade-specific enrollment projections, for which past enrollment data do not exist, such as those for new schools or for revised attendance areas. We describe the techniques used to link the student information system to the digital map, compute the spatial filter statistics efficiently, and make projections for new school attendance areas. We have used the modifiable spatial filter method for projecting student populations and modifying attendance area boundaries in two Iowa school districts.

Environment and Planning C: Government and Policy, 1991

A prototype spatial decision support system (SDSS) was used by a task force appointed by the Stat... more A prototype spatial decision support system (SDSS) was used by a task force appointed by the State of Iowa to redraw the boundary lines of education service delivery regions so that “the total number … is no fewer than four and no greater than twelve”. Details of this regionalization problem are described and key stages are identified in the task force's adoption and use of the SDSS to arrive at recommended solutions. The approach separates the policy task of setting regionalization objectives and criteria from the more technical task of locational analysis which involves searching for alternatives that meet the requirements of the policy criteria. It is concluded that the SDSS contributed significantly to meeting the basic objectives of the Iowa Legislature.

Environment and Planning B: Planning and Design, 1990

A system for providing decision support to people who make locational decisions is described in w... more A system for providing decision support to people who make locational decisions is described in which the domain-specific knowledge of users is combined with the general problem-solving strategies, techniques, and mathematical models of location analysts. The system elicits and stores separately environmental, procedural, and structural knowledge so that experts in particular problem domains can access, examine, and modify this knowledge.

Computers, Environment and Urban Systems, 1991

ABSTRACT The problem of finding an optimal number of regions, and service locations within each r... more ABSTRACT The problem of finding an optimal number of regions, and service locations within each region, to serve a dispersed geographical pattern of demand is treated as an interactive location-allocation modeling problem. Distinctive elements of the problem involve controlling the location of region boundaries, solving for multiple objectives that involve minimizing average and maximum distances to clients from central facilities, ensuring that a minimum number of clients are served in each region, and, under user-defined circumstances, using existing facilities in selected locations. A prototype microcomputer-based spatial decision-support system is described. We also discuss its use by members of an Iowa state government Workgroup charged with developing recommendations for the geographical reorganization of educational services provided to Iowa school districts from central facilities.

Cartography and Geographic Information Systems, 1992

Page 1. Cartographic Displays to Support Locational Decision Making Marc P. Armstrong, Paul J. De... more Page 1. Cartographic Displays to Support Locational Decision Making Marc P. Armstrong, Paul J. Densham, Panagiotis Lolonis, and Gerard Rushton ABSTRACT. A functional taxonomy is developed that describes the kinds ...

After the incorporation of digital Information Technologies (IT) in the regular operations of mai... more After the incorporation of digital Information Technologies (IT) in the regular operations of mainstream cadastral systems, particularly in the advanced countries, attention has been paid in expanding the capabilities of those systems in other areas of operations and capturing additional aspects of the cadastral domain. An important path of work that has been initiated, particularly at the research level, since the beginning of this century deals with the incorporation of the 3rd spatial dimension of cadastral objects (that is, the vertical dimension) into the IT cadastral systems. Most efforts, so far, have focused primarily on capturing and representing the physical and technical aspects of real 3D entities (e.g. buildings, structures etc.) However, in order for those systems to really incorporate the essence of the spatial dimension of the cadastral objects and use it in covering the everyday cadastral activities, it is important to analyze the real nature of physical and abstrac...

Statistics in Medicine, 1996

The spatial patterns of infant mortality and birth defect rates in the Des Moines, Iowa, urban re... more The spatial patterns of infant mortality and birth defect rates in the Des Moines, Iowa, urban region are described as a contoured surface based on the punctual kriging of address-matched vital statistics records from The Iowa Department of Public Health. Areas defined as having high rates are shown to be sensitive to the size of the spatial filtering units. There is no correlation between infant mortality and birth defect rates in the region. The significance of areas with high rates is determined by a Monte Carlo simulation procedure. One area of high infant mortality is found in the region, which contrasts with many smaller areas with high birth defect rates in the region. The observed birth defect rate pattern is consistent with the hypothesis that each birth was equally likely to result in a birth defect, while the infant mortality pattern is unlikely to be the result of such an equal likelihood process.

Topografia Y Cartografia Revista Del Ilustre Colegio Oficial De Ingenieros Tecnicos En Topografia, 2003

Statistics in Medicine, 1996

Socio-Economic Planning Sciences, 1995

Environment and Planning C: Government and Policy, 1991

Environment and Planning B: Planning and Design, 1990

Computers, Environment and Urban Systems, 1991

Cartography and Geographic Information Systems, 1992

Statistics in Medicine, 1996