ISPRS Test Project on Urban Classification and 3D Building Reconstruction The ISPRS working group III/4 announces the release of the 2D semantic labeling benchmark, which is an extension to the ongoing object detection and 3D building reconstruction challenge. The aim is to foster research in urban image classification using state-of-the-art airborne remote sensing images. The working group provides 33 true ortho image and DSM tiles of very high resolution and quality, and in addition deliver complete reference classification (labeling) for 16 of those tiles. Participants are encouraged to deliver their classification for the remaining 17 tiles. The evaluation results will be published on the working group website. See the link for details. The datasets can be downloaded after registration at Further information is available through the working group officials, see

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