How to prepare the aerial part of MatrixCity block_small?

[Xiang-cbyte]

Hi, thank you for releasing the HorizonGS code and dataset.

I am trying to reproduce the MatrixCity block_small experiment. According to the provided configuration:

config/ours/matrix_city/block_small/coarse.yaml
source_path: data/matrixcity/small_city/merge/pose/block_small
data_format: blender
add_aerial: True
add_street: True

it seems that block_small is expected to contain both aerial and street-view images. The dataloader also determines the camera type according to whether the image path contains aerial or street.
However, in the MatrixCity data I downloaded, I can only find the following aerial pose folders:

small_city/aerial/pose/block_A
small_city/aerial/pose/block_B
small_city/aerial/pose/block_C
small_city/aerial/pose/block_D
small_city/aerial/pose/block_E
small_city/aerial/pose/block_all

I could not find:

small_city/aerial/pose/block_small
For the street-view side, I found:
small_city/street/pose/block_small

which uses small_city_road_horizon and small_city_road_vertical.
Could you please clarify how the aerial part of block_small is constructed? Specifically:
Is there a preprocessed merge/pose/block_small folder released with HorizonGS?
Which aerial image blocks are used for block_small?
Is block_small built from one of block_A to block_E, or from a subset of block_all?
Could you provide the expected directory structure for reproducing the block_small experiment?
Thank you very much for your help.