Analysis of the Sustainable Development Index in the Communes of the Podkarpackie Voivodeship: A Polish Case Study

Intense global urbanization, including spatial planning development, is an essential area that determines sustainable development. It is known that urban development is typically tied to an increase in socioeconomic productivity while also creating considerable inequalities. Despite mounting evidence of intense urban area development, little is known about its consequences on the sustainable development of territories adjacent to said areas. Despite the positive and negative consequences of urbanization and their impact on sustainable development often being highlighted, there is little understanding of and a dearth of analyses on sustainability processes that include spatial planning development. To fill this gap, it must be assessed where sustainable development is actually taking place. Such analyses should not only be confined to the four essential areas: economic development, social development, environmental development, and institutional development, that are tied to sustainable development index calculations. They should also determine the transformations experienced by the areas and factor in a fifth analysis area: spatial planning development. In this paper, detailed data sourced from the Statistics Poland were used to formulate sustainable development indices for urban, rural–urban, and rural communes of the Podkarpackie region of Poland. The data concerned the five areas listed above. Using data standardization and the averaged index method, sustainable development index values were quantified to demonstrate that they displayed various levels of inequalities for the two reference periods of 2015 and 2020. These statistics indicate the key role of spatial planning development in assessing sustainability indices. The findings show that it is not only possible to enhance standard calculation methods to include other data and use them in time and space to create a simple and general quantitative rating of sustainable development, but urbanization can also be factored in that includes spatial planning development. The findings show that a modified computation approach is a reliable and relatively complete index of sustainable development that compensates for the deficiencies of current metrics.