---
pretty_name: CMA-Loc
tags:
- geolocation
- cross-view-localization
- remote-sensing
- aerial-imagery
---

# CMA-Loc

This repository stores the CMA-Loc dataset as uncompressed tar shards plus the original JSON annotation files.

## Layout

```text
data/*.tar                         # image shards, paths inside each tar keep the original urban/<city>/<modality>/... layout
metadata/*.json                    # original annotation split files
manifests/shards.jsonl             # one row per tar shard
manifests/files.jsonl              # one row per image file with its shard mapping
manifests/shard_file_lists/*.txt    # exact file list used to create each shard
checksums.sha256                   # SHA-256 checksums for uploaded files
```

## Summary

- Image files: 180430
- Image input size: 73.67 GiB
- Tar shards: 49
- Tar shard size: 73.80 GiB
- Cities: Berlin, Chicago, London, Losangeles, Moscow, Newyork, Paris, Tokyo
- Modalities: crop_sate, mono, sate

| City | Modality | Files | Size |
|---|---:|---:|---:|
| Berlin | crop_sate | 3450 | 1.86 GiB |
| Berlin | mono | 2242 | 5.31 GiB |
| Berlin | sate | 817 | 2.11 GiB |
| Chicago | crop_sate | 1826 | 0.89 GiB |
| Chicago | mono | 1422 | 2.76 GiB |
| Chicago | sate | 542 | 1.21 GiB |
| London | crop_sate | 5800 | 3.21 GiB |
| London | mono | 20862 | 5.72 GiB |
| London | sate | 9275 | 4.85 GiB |
| Losangeles | crop_sate | 4197 | 2.32 GiB |
| Losangeles | mono | 2995 | 0.72 GiB |
| Moscow | crop_sate | 2821 | 1.37 GiB |
| Moscow | mono | 20307 | 1.83 GiB |
| Moscow | sate | 9167 | 2.22 GiB |
| Newyork | crop_sate | 7669 | 4.12 GiB |
| Newyork | mono | 23773 | 6.77 GiB |
| Newyork | sate | 10447 | 7.51 GiB |
| Paris | crop_sate | 4244 | 2.43 GiB |
| Paris | mono | 20122 | 4.88 GiB |
| Paris | sate | 8957 | 4.62 GiB |
| Tokyo | crop_sate | 2336 | 1.32 GiB |
| Tokyo | mono | 11507 | 2.78 GiB |
| Tokyo | sate | 5652 | 2.86 GiB |

## Usage

List files in a shard:

```bash
tar -tf data/urban_newyork_mono_00000.tar | head
```

Extract all shards:

```bash
mkdir -p extracted
for shard in data/*.tar; do tar -xf "$shard" -C extracted; done
```

The annotation JSON files refer to image filenames. The full image paths are preserved in the tar members under:

```text
urban/<city>/mono/<mono_filename>
urban/<city>/sate/<satellite_filename>
urban/<city>/crop_sate/<cropped_satellite_filename>
```

Use `manifests/files.jsonl` to locate the tar shard containing a specific image path.