PREFACE: TECHNICAL COMMISSION II

Abstract. ISPRS Technical Commission II focuses, at various scales, on geometric, radiometric and multi-temporal aspects of image- range-based 3D surveying modeling. Specifically, deals with image orientation, point cloud generation processing, feature extraction, dynamic static scene analysis, sensor data fusion, machine learning for geospatial analysis big techniques massive processing. Applications in the fields mapping, infrastructure monitoring, heritage studies, space exploration, underwater photogrammetry environmental engineering are also considered.The Volume related to contains 108 papers published Archives 20 Annals. The were accepted from among 111 abstract submissions 59 full papers. Of papers, 32 paper 76 submissions. Annals selected after going through a peer review process.In aforementioned areas research, this volume discuss challenges needs, introduce novel photogrammetric solutions that depict latest developments field.There has been wide range coverage these topics processing most active close 38% This is followed by machine/deep methods 31.8% provide semantic enrichment images data. Research studies represented 9% 6%, respectively, papers.We believe volumes nicely recap state-of-the-art, current trends possible applications nice overview future research directions.On behalf II, we would like thank local organizers 2021 Congress, members international program committee, all Working Group officers reviewers their hard organizational work efforts reviewing process.