The dependence of the radiometric surface temperature on the structure of the urban fabric: the case of the metropolitan area of Athens using very high spatial resolution data

Postgraduate Thesis uoadl:2850435 260 Read counter

Unit:
Κατεύθυνση Γεωγραφία και Περιβάλλον
Library of the School of Science
Deposit date:
2019-02-01
Year:
2019
Author:
Papalexi Chrysa
Supervisors info:
Δρ. Μαρία Χατζάκη, Επίκουρη Καθηγήτρια, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, ΕΚΠΑ
Δρ. Ιφιγένεια Κεραμιτσόγλου, Κύρια Ερευνήτρια, ΙΑΑΔΕΤ, Εθνικό Αστεροσκοπείο Αθηνών
Δρ. Εμμανουήλ Βασιλάκης, Επίκουρος Καθηγητής, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, ΕΚΠΑ
Original Title:
Η εξάρτηση της ραδιομετρικής θερμοκρασίας επιφάνειας από τη δομή του αστικού ιστού: η περίπτωση της μητροπολιτικής περιοχής της Αθήνας με χρήση δεδομένων πολύ υψηλής χωρικής ανάλυσης
Languages:
Greek
Translated title:
The dependence of the radiometric surface temperature on the structure of the urban fabric: the case of the metropolitan area of Athens using very high spatial resolution data
Summary:
The urban thermal environment is of paramount importance to humans, as most of the world's population lives and operates in urban centers. The land surface temperature (LST) is a reliable indicator of Surface Urban Heat Island effects, as it directly affects the air temperature and is considered a basic parameter of the physical surface.
In the present study, the distribution and behavior of LST for the Athens area are studied, with data derived from ESA's THEPOPOLIS ground and airborne experimental campaign in the summer of 2009. Specifically, nocturnal aerial radiometric measurements of very high spatial resolution were used during three typical summer days with different weather conditions: a relatively hot day, a cool day with strong Etesian winds and a heat wave day. It is also being studied the relationship between LST and the urban fabric, which represents the built-up coverage rate of the residential area per spatial unit according to the European Settlement Map (ESM) provided by the Copernicus Land Monitoring Service. Finally, the LST of Thermopolis data is compared with the corresponding LST of the MODIS satellite data.
LST was found to be significantly determined by different urban land cover/land use (LCLU) classes but also by meteorological conditions. From the spatial analysis, LST shows spatial clustering of islands of very high LST (hotspots) in the center and the southwest and low LST (coldspots) in the northern and eastern regions, which is affected by the prevailing meteorological conditions. Between LST and the urban fabric a general linear relationship can be constructed, but more explanatory variables are needed on building a robust global model. Conversely, constructing a locally weighted regression model strongly links these two variables. Finally, the LST of the MODIS satellite data differs statistically significantly from that of Thermopolis, but there is a strong correlation between them and LSTMODIS and LSTTherm do not show statistically significant accumulation, because as the spatial resolution decreases, so the information of the hotspots and coldspots do.
In order to improve the results of the present study, suggestions for further study are given. As the urban hyper-concentration will continue to grow, the need for an improved relationship between urban density and a livable urban climate will continue to increase.
Main subject category:
Science
Keywords:
land surface temperature, urban heat island, land cover/land use, geostatistical modelling
Index:
Yes
Number of index pages:
3
Contains images:
Yes
Number of references:
49
Number of pages:
98
Papalexi_MSc_thesis.pdf (11 MB) Open in new window