ANÁLISE DA TEMPERATURA DE SUPERFÍCIE POR MEIO DE TÉCNICAS DE GEOPROCESSAMENTO E SUA RELAÇÃO COM O USO E COBERTURA DA TERRA NO MUNICÍPIO DE PONTA GROSSA – PR

Abstract

Changes in the natural cover and the growth of urban areas modified the radiation rates that are absorved and reflected, since this radiation is absorved may contribute to the increase in surface and air temperature. This work analysed the influence of the land use and land cover in the city of Ponta Grossa – PR on the land surface temperature. Multitemporal Lansat 5 satellite images were used to obtain the land use and land cover classification and to generate temperature values. The land use and land cover classification were performed using a hybrid method, combining the regions growth classification and vector edition. The surface temperature values were obtained by the processing of digital numbers, through the THERMAL tool, of IDRISI software. With maps of land use and land cover and temperature classes, were compared the plans informations. Principal coordinates analysis were executed for each year, in order to assess which temperature classes were more significant on the diferent use classes. The results of compares showed a difference in temperature between land use classes. In general, classes of urban area and exposed soil showed the highest temperatures, however the natural forest and reforestation classes showed lower temperatures. Through ordination diagram generated by principal coordinates analysis, observed the formation of two major groups of class. One formed by antropic classes, associate with higher temperatures, other with forest formations, associated with the lowest temperatures.