The Riuades viewer is an interactive tool developed by the ICGC that allows the comparison of orthoimages generated from aerial photographs captured before and after storms that have caused heavy rainfall, with the aim of facilitating the assessment of the damage caused.

The main objective is to provide a service to the different professionals who need to assess the damage caused by episodes of heavy rainfall.

The recipients include professionals in land management, civil protection, urban planning, researchers and the general public interested in the impact of floods.

Technical data

The data comes from aerial photographs and satellite images captured before and after the flood episodes. The orthoimages have a resolution that varies between 5 cm and 10 m, depending on the source and the date of capture. With this application, the following cartography is visualized and compared:

• Current orthophoto: Latest conventional orthophoto published by the ICGC. Pixel size 25 cm.
• Francolí October 2019: Orthophoto made from aerial photographs of the areas affected by the floods of October 2019 in the Francolí area and small areas of other adjacent basins. Images captured on October 30, 2019. Pixel size 10 cm. The delimitation of the white polygon determines the area covered by these orthoimages.
• Low course of the Ter river January 2020 (satellite): Orthophoto made from satellite image captured on January 23 with the ESA Sentinel-2 satellite. Pixel size 10 m.
• Fluvià January 2020: Orthophoto made from aerial photographs of the areas affected by the floods of storm Gloria in the Fluvià area. Images captured on January 24, 2020. Pixel size 10 cm.
• Tordera January 2020: Orthophoto made from aerial photographs of the areas affected by the floods of storm Gloria in the Tordera area. Images captured on January 24, 2020. Pixel size 10 cm.
• Ter January 2020: Orthophoto made from aerial photographs of the areas affected by the floods of storm Gloria in the Ter area. Images captured on January 28, 2020. Pixel size 10 cm.
• Llobregat February 2020: Orthophoto made from aerial photographs of the areas affected by the floods of storm Gloria in the Llobregat area. Images captured on February 3, 2020. Pixel size 10 cm.
• Montsià Streams September 2021: Orthophoto made from aerial photographs of the areas affected by the floods of the Montsià streams. Images captured on September 3, 2021. The area near the coast between Alcanar and Sant Carles de la Ràpita has a pixel size of 5 cm while the rest has a pixel size of 15 cm and has partial cloud cover.