District-scale surface temperatures generated from high-resolution longitudinal thermal infrared images

Abstract

This paper describes a dataset collected by infrared thermography, a non-contact, non-intrusive technique to acquire data and analyze the built environment in various aspects. While most studies focus on the city and building scales, an observatory installed on a rooftop provides high temporal and spatial resolution observations with dynamic interactions on the district scale. The rooftop infrared thermography observatory with a multi-modal platform capable of assessing a wide range of dynamic processes in urban systems was deployed in Singapore. It was placed on the top of two buildings that overlook the outdoor context of the National University of Singapore campus. The platform collects remote sensing data from tropical areas on a temporal scale, allowing users to determine the temperature trend of individual features such as buildings, roads, and vegetation. The dataset includes 1,365,921 thermal images collected on average at approximately 10-second intervals from two locations during ten months.

Analyzing Thermal Images to Evaluate Thermal Protection in Residential Structures: Lessons from Russian Practices

“…The comprehensive solution to the problems discussed in the article and the implementation of capabilities for qualitative and quantitative assessment of thermal images during construction thermography allow answering the question: «Does the control object meet the current requirements for thermal protection or not?» If «No», a list of possible energy-saving measures aimed at complete or partial resolution of the identified issues is compiled [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. For instance, in the case of detecting localized (fragmentary) excess heat losses through the external enclosing structures of a construction object, an energy-saving measure could be the external thermal insulation of walls using sprayed polyurethane foam with a protective coating or liquid insulation.…”

“…Results of thermal imaging can be evaluated both qualitatively and quantitatively [3,27]. In the case of qualitative analysis, thermograms are examined for temperature anomalies based on the temperature difference at the location of the presumed defect and the reference zone [8,10,[12][13][14][15][16][17]. The reference zone should be selected similarly to the controlled zone and be in the same heat exchange conditions (located near the inspected area).…”

“…The reference zone should be selected similarly to the controlled zone and be in the same heat exchange conditions (located near the inspected area). There are rules for qualitative thermogram analysis that enhance the effectiveness of detecting and assessing temperature anomalies [3][4][5][6][7][8][9][11][12][13][14][15][16][17][18][19]: Supplementing the thermogram with a visible image (photograph). Computer overlay of visible and thermal images.…”

“…Using an overview thermogram of the external surfaces of enclosing structures, areas with compromised thermal insulation properties are identified, subsequently subjected to detailed thermography from the internal side of enclosing structures [3][4][5][6][7][8][9][10]. Thermography can be either overview or detailed [5][6][7][8][9][10][11][12][13][14][15]. Overview thermography involves thermal imaging of external and/or internal surfaces of enclosing structures.…”

“…Thermal imaging inspection of control objects of any purpose involves a complex set of activities, requiring qualified specialists and appropriate instrumentation [13][14][15][21][22][23][24].…”