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Evaluating the connectivity level of Fayoum city roads network: a new method using GIS

Saleh Ahmed Younes, Abdu Saeed Ahmed, Ali Hanaa Nazer

Prace Komisji Geografii Komunikacji PTG

2018

nr 21(4)

60--72

Road networks within cities are a vital component of the socio-economic development processes. Many countries have sought to examine and evaluate the efficiency of road networks within urban areas because of the increasing demand for transportation. Thus, networks should be evaluated to guide the development of transport systems and infrastructure within cities. This study evaluates the connectivity level of the road network parts in Fayoum city, Egypt, through the application of some indicators of connectivity measurement, such as Beta, Alpha, Gamma, Connectivity degree, and the density of edges and nodes. The study follows a new method for evaluation; it does not apply the indicators on the network as a whole; however, it divides the city into zones and calculates the indicators of each zone using the Arc GIS 10.2.1 program. The authors applied the map Algebra method to map the results of the six indicators in one index called the Total Connectivity Index (TCI). The TCI gives more consistent results than other indices, and it is more related to different spatial patterns of roads. According to this indicator, most of the city road network seem to have a good connectivity level, whereas the city marginal areas prove to have a poor connectivity level. Therefore, any efforts to develop or construct new roads should be in the marginal areas of the city.

Application of GIS methods in assessing effects of mining activity on surface infrastructure

Blachowski J., Chrzanowski A., Szostak-Chrzanowski A.

Archives of Mining Sciences

2014

Vol. 59, no. 2

307--321

Tilt (T), curvature (K) and horizontal strain (ε) in ground subsidence troughs are the basic deformation parameters, which are used in the assessment of mining effects on surface infrastructure. The parameters can be determined from mathematical functions describing the continuous displacement field. The latter can be obtained by the least squares fitting of selected displacement functions to results of three-dimensional monitoring of horizontal and vertical displacements at discrete points. A methodology based on spatial data modelling in Geographic Information Systems (GIS) facilitates the above process as demonstrated on the example of a mining area in Canada. Polish guidelines regarding classification of mining risk categories based on the values of these parameters have been used in the example.

Nachylenie (T) , krzywizna (K) oraz odkształcenie poziome (ε) w niecce obniżeniowej to podstawowe wskaźniki używane do oceny wpływu działalności górniczej na infrastrukturę na powierzchni. Wskaźniki te można wyznaczyć poprzez wpasowanie odpowiedniej funkcji matematycznej opisującej pole przemieszczeń. Pole to można otrzymać poprzez wpasowanie wybranych funkcji przemieszczeń do wyników pomiarów (3D) poziomych i pionowych przesunięć punktów sieci obserwacyjnej. Metodyka oparta na modelowaniu danych przestrzennych w systemach informacji geograficznej (GIS) wspomaga ten proces co zademonstrowano na przykładzie terenu górniczego w Kanadzie. Wykorzystano polskie wytyczne w zakresie kategorii terenów górniczych oparte na wartościach tych wskaźników.