The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLII-4/W19
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-4/W19, 249–254, 2019
https://doi.org/10.5194/isprs-archives-XLII-4-W19-249-2019
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-4/W19, 249–254, 2019
https://doi.org/10.5194/isprs-archives-XLII-4-W19-249-2019

  23 Dec 2019

23 Dec 2019

LOST WATERWAYS: CLUES FROM DIGITIZED HISTORICAL MAPS OF MANILA AND OTHER PHILIPPINES CITIES

K. G. Jubilo1, M. R. Algodon1, E. M. Torres1, Z. D. Abraham1, A. Ide-Ektessabi2, and M. Soriano1 K. G. Jubilo et al.
  • 1National Institute of Physics, University of the Philippines Diliman Quezon City 1101, Philippines
  • 2Advanced Imaging Technology Laboratory, Graduate School of Engineering, Kyoto University, Japan

Keywords: historical maps, flooding hazards, bodies of water image processing algorithms, image transformations

Abstract. We search for lost bodies of water in the cities of Manila, Tacloban, Iloilo, Cebu, Davao, and Naga by aligning their digitized Spanish-era and American-era maps to Google maps. These vanished ancient waterways can either become flooding hazards in case of extreme weather events, or liquefaction hazards, in case of earthquakes. Digitized historical maps of the cities were georectified, overlaid on current Google maps, and checked for potential missing bodies of water. Inspection through field visits and interviews with locals were conducted to verify the actual status of suspected sites. The validation identified lost, found, and even new bodies of water. There was also evidence of affected buildings, rainless flooding, and a “new normal” for the meaning of flooding among frequently inundated residents.