Case study on Automatic Extraction of Tents during Hajj from Airborne Images

Hajj Pilgrimage

This is a case study in which the usage of GIS is beneficial for temporary settlements such as the tent cities built for the Haj Pilgrimage in Saudi Arabia (Islamic Pilgrimage). This annual religious event brings around 5 to 6 million pilgrims every year to Mecca and with the huge number of pilgrims, the use of urban space is a major concern for engineers, urban designers, and urban planners. Pilgrims must stay in the Holy Area (Arafat) for one day as part of Hajj rituals. For this reason, pilgrims are housed in lightweight temporary structures: tents. In Arafat, these tents are constructed before each Hajj season. The arrangement of these tents differs from one year to another and from location to location. For the spatial and temporal constraints of ritual happening in Arafat, space optimization is an important issue. The extensive demand for a rapid, automatic, and high quality algorithm for feature extraction has been the subject of much recent research.

This study present an approach for using airoborne images, tents were detected and extracted, then were used calculate the areas covered by tents. It utilizes the intensity in digital images in two stages. First, it classifies tents from other features in Arafat’s environment. Second, it calculates the number of tents based on image matching subroutines. This can evaluate the design and planning of tents’ layout and space optimization. Using this automatic approach, the number of pilgrims in a tested area can also be estimated according to the average capacity of one-meter squares covered by tents. Moreover, services, utilities, and transportation needs can be determined more precisely. An actual sample area in Arafat during the Hajj season is used to test the approach developed in this research.

http://www.cad-gis.com/n/publications/automatic_extraction_of_tents.pdf

An arial image of Arafat,showing its spatial limits.(Courtesy;space Imaging Middle East)