You can load and merge 28 HD maps into one map as followings.
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Download TFD/TFD-Example dataset
# For example: download TFD-Example into ./dataset/v2x-seq-tfd with path ${DATA_ROOT} bash tools/dataset_example_download.sh
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Load and Merge HD Maps
mkdir ${DATA_ROOT}/map_files python tools/data_converter/maps_merge.py