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README.md

@@ -37,6 +37,16 @@ Each split contains three aligned folders:
 - `labels/` — grayscale semantic label maps (4096×4096, uint8)
 - `labels_RGB/` — colorized label maps for visualization (4096×4096, RGB)
 
+## How to Extract Tar Shards
+
+Large splits (`core/train` and all `extended/*`) are stored as tar shards (~12–29 GB each). Each shard internally contains the aligned `images/`, `labels/`, and `labels_RGB/` folders. After downloading the shards of a split, extract them in place:
+
+```bash
+for f in *.tar; do tar -xf "$f"; done
+```
+
+This yields the three folders with all samples merged. (`core/test` is provided as plain files for direct preview.)
+
 ## Semantic Categories
 
 13 foreground classes plus an *unlabeled* category (pixel value 0, ignored in training and evaluation):