Orfeo ToolBox (OTB)

Orfeo ToolBox (OTB) is an open-source C++ library developed by CNES (Centre National d'Études Spatiales) for processing remote sensingRemote SensingRemote sensing is the science of collecting data about Earth's surface without direct physical contact, primarily usi... imagery. Named after the Pléiades Earth observation program, OTB provides state-of-the-art algorithms specifically designed for the challenges of high-resolution optical and SARSARSynthetic Aperture Radar (SAR) is an active remote sensing technology that uses microwave radar pulses to create high... satellite data, including large image handling, radiometric calibrationRadiometric CalibrationRadiometric calibration converts raw digital numbers recorded by a sensor into physical units of radiance or reflecta..., and advanced classification techniques. OTB includes over 100 applications covering the complete remote sensing processing chain: optical calibration, pansharpening, orthorectification, image segmentation (mean-shift, watershed, morphological), supervised and unsupervised classificationUnsupervised ClassificationUnsupervised classification is an automated remote sensing technique that groups pixels into spectral clusters withou... (SVM, Random ForestRandom ForestRandom Forest is an ensemble machine learning method that builds multiple decision trees during training and merges t..., deep learning), change detectionChange DetectionChange detection uses geospatial data and imagery to track and analyze alterations in landscapes, infrastructure, or ..., feature extraction, and object-based image analysis. It processes images of any size through streaming, reading and writing data in tiles to handle datasets that exceed available memory. The toolbox can be used through a command-line interface, a graphical application called Monteverdi, QGISQGISQGIS is a user-friendly, open-source GIS platform that provides tools for geospatial data analysis, mapping, and inte... integration, or Python bindings. OTB is designed to complement SNAP and other tools in the open-source remote sensing ecosystem. It is widely used in national mapping agencies, research institutions, and environmental organizations for land cover mapping, urban monitoring, agricultural analysis, and disaster damage assessment. OTB remains actively maintained and distributed through the OSGeo community.