00000nam 2200000za 4500 9.853128 CaOODSP 20221107154742 cr ||||||||||| 180308s2018 oncbo #ob f000 0 eng d CaOODSP eng n-cn-qu M103-3/38-2018E-PDF New flood mapping methods implemented during the 2017 spring flood activation in southern Quebec [electronic resource] / I. Olthof ... [et al.]. Ottawa : Natural Resources Canada, 2018. 16 p. : maps, photos Open file ; 38 Includes bibliographical references. "Spring 2017 flooding in eastern Ontario and southern Quebec was caused by a number of consecutive record-setting rain events combined with melting snow between April 5 and mid-May. In Quebec, the event caused more than 5000 residences to flood in 261 municipalities, forcing mass evacuations and declaration of a state of emergency. The International Disasters Charter was activated shortly after, providing near-real time earth observation data from a range of sensors through Charter member agencies. Upon activation, the Emergency Geomatics Services (EGS) at the Canada Centre for Mapping and Earth Observation (CCMEO), Natural Resources Canada (NRCan), produced flood maps from RADARSAT-2 and Charter satellite imagery to provide up-to-date situational awareness. Previous methodologies to extract flood information were not adequate to map open water and flooded vegetation from all data received through the Charter, while work was ongoing in the previous year to develop reliable flood extraction methods from multiple sensors for floodplain characterization. These new methods were quickly adapted and put into operations during the activation, enabling rapid flood map production from RADARSAT-2, Sentinel-1 and TerraSar-X, among other sensors. This document describes the methodology and presents successes and challenges of the 2017 EGS activation for flooding in eastern Ontario and southern Quebec. From lessons learned during the 2017 activation, we also present a way forward to improve subsequent flood activations"--Abstract, p. 3. gccst Floods gccst Satellites gccst Geographic data Olthof, I. (Ian), 1969- Canada. Natural Resources Canada. Geomatics Canada. Open file (Geomatics Canada) 38. (CaOODSP)9.821474 PDF 1.48 MB https://publications.gc.ca/collections/collection_2018/rncan-nrcan/m103-3/M103-3-38-2018-eng.pdf