---
license: cc-by-sa-4.0
tags:
- earth-observation
- remote-sensing
- elevation
- satellite
- geospatial
size_categories:
- 1M<n<10M
dataset_info:
- config_name: default
  features:
  - name: grid_cell
    dtype: string
  - name: thumbnail
    dtype: image
  - name: compressed
    dtype: image
  - name: DEM
    dtype: binary
configs:
- config_name: default
  data_files: images/*.parquet
- config_name: metadata
  data_files: metadata.parquet
---

# Major TOM Core-DEM

Contains a global coverage of [Copernicus DEM](https://spacedata.copernicus.eu/collections/copernicus-digital-elevation-model), each of size 356 x 356 pixels.

| Source | Modality Type | Number of Patches | Patch Size | Total Pixels |
|:-------|:-------------:|:-----------------:|:----------:|:------------:|
|Copernicus DEM 30 | Digital Surface Model (DSM) |1,837,843| 356 x 356 (30 m) | > 1.654 Billion |

Produced in collaboration by European Space Agency Φ-lab and Adobe Research.

## Content

| Column | Details | Resolution |
|:-------|:--------|:-----------|
| DEM | Original data | 30m | 
| thumbnail | compressed hillshade visualisation | 30m | 
| compressed | compressed jpeg of original data | 30m | 

## Spatial Coverage
This is a global monotemporal dataset that contains nearly the entire COP-DEM dataset.

The following figure demonstrates the spatial coverage (only black pixels are absent):
![image/png](https://cdn-uploads.huggingface.co/production/uploads/6304c06eeb6d777a838eab63/v5O9bSVPsnKNOrnzVNuH0.png)

## Example Use

Interface scripts are available at https://github.com/ESA-PhiLab/Major-TOM

Here's a sneak peek with a thumbnail image:
```python
from fsspec.parquet import open_parquet_file
import pyarrow.parquet as pq
from io import BytesIO
from PIL import Image

PARQUET_FILE = 'part_00390' # parquet number
ROW_INDEX = 42 # row number (about 500 per parquet)

url = "https://huggingface.co/datasets/Major-TOM/Core-DEM/resolve/main/images/{}.parquet".format(PARQUET_FILE)
with open_parquet_file(url,columns = ["thumbnail"]) as f:
    with pq.ParquetFile(f) as pf:
        first_row_group = pf.read_row_group(ROW_INDEX, columns=['thumbnail'])

stream = BytesIO(first_row_group['thumbnail'][0].as_py())
image = Image.open(stream)
```

Powered by [Φ-lab, European Space Agency (ESA) 🛰️](https://huggingface.co/ESA-philab)

---
Produced using Copernicus WorldDEM-30 © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH
2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved