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To expand on davinci's answer: You cannot save an OctoMap as .pcd file. In fact, there are no more point clouds to store after you integrated them into OctoMap, since the individual points are not retained by used for a probabilistic occupancy estimation in voxels. How exactly did you store the .pcd file, and from where?

You can only store octomaps into the native .ot or .bt file format, which you can then open and process using the octomap API or visualize with octovis.