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Short answer: The saved cloud is the map, the load function loads individual measurements.

Details:

The load function takes a set of pcd files, each representing one sensor measurement and expects each to have the 2d raster layout of a depth image, e.g. 640x480.

The saved cloud is an aggregation of the point clouds in the map, transformed into a common coordinate frame (/map). Because of the aggregation, the raster layout is dropped and the cloud has "flat" dimensions.

The obvious next question is "how do I load a map into rgbdslam", e.g. to continue mapping. Unfortunately you can't, it's not implemented.