BnJam: #stac how big is the data for all bands of sentinel-2 l2a covering haida gwaii, british columbia, for the latest image
GitHub Copilot: Optimizing tool selection...I'll first search for recent Sentinel-2 L2A items over Haida Gwaii to identify the latest scene and its exact timestamp, so we can estimate the data size accurately for that specific image.
Ran `search_items`
Completed with input: {
"bbox": [
-133.5,
52,
-130.5,
54.5
],
"collections": [
"sentinel-2-l2a"
],
"datetime": "2025-07-01/2025-09-19",
"limit": 20
}
```bash
Found 20 items:
**S2A_MSIL2A_20250918T200851_R128_T09UVA_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-130.57, 54.25, -130.07, 55.04]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T09UUV_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-132.06, 53.12, -130.60, 54.14]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T09UUU_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-132.00, 52.23, -131.12, 53.23]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T09UUT_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-131.93, 51.97, -131.62, 52.32]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T09UUA_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-132.13, 54.02, -130.39, 55.04]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UQE_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-132.01, 53.10, -130.64, 54.11]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UQD_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-132.07, 52.21, -131.15, 53.21]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UQC_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-132.08, 51.97, -131.63, 52.31]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UPF_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-133.47, 54.02, -131.72, 55.04]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UPE_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-133.50, 53.12, -131.79, 54.14]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UPD_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-133.53, 52.22, -131.86, 53.24]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UPC_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-133.53, 52.00, -131.92, 52.34]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UNF_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-135.00, 54.05, -133.28, 55.05]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UNE_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-135.00, 53.15, -133.32, 54.15]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UND_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-135.00, 52.31, -133.36, 53.25]
Assets: 23
**S2A_MSIL2A_20250918T200851_R128_T08UNC_20250919T000714** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T20:08:51.024000+00:00
BBox: [-133.53, 52.31, -133.39, 52.34]
Assets: 23
**S2B_MSIL2A_20250918T195009_R085_T09UVV_20250918T231850** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T19:50:09.024000+00:00
BBox: [-130.53, 53.15, -128.85, 54.15]
Assets: 23
**S2B_MSIL2A_20250918T195009_R085_T09UVA_20250918T231850** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T19:50:09.024000+00:00
BBox: [-130.57, 54.05, -128.85, 55.05]
Assets: 23
**S2B_MSIL2A_20250918T195009_R085_T09UUV_20250918T231850** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T19:50:09.024000+00:00
BBox: [-132.06, 53.12, -130.35, 54.14]
Assets: 23
**S2B_MSIL2A_20250918T195009_R085_T09UUU_20250918T231850** (Collection: `sentinel-2-l2a`)
Date: 2025-09-18T19:50:09.024000+00:00
BBox: [-132.00, 52.23, -130.32, 53.24]
Assets: 23
```
Next, I'll estimate the total data size for all Sentinel-2 L2A band assets intersecting Haida Gwaii for the latest acquisition window we just found.
Ran `estimate_data_size`
Completed with input: {
"bbox": [
-133.5,
52,
-130.5,
54.5
],
"collections": [
"sentinel-2-l2a"
],
"datetime": "2025-09-18T20:00:00Z/2025-09-18T21:00:00Z",
"limit": 100
}
```bash
**Data Size Estimation**
Items analyzed: 16
Estimated size: 37008.81 MB (36.1414 GB)
Raw bytes: 38,806,551,936
**Query Parameters:**
Collections: sentinel-2-l2a
Bounding box: [-133.5000, 52.0000, -130.5000, 54.5000]
Time range: 2025-09-18T20:08:51.024000+00:00 to 2025-09-18T20:08:51.024000+00:00
**Data Variables:**
- AOT: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B01: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B02: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B03: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B04: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B05: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B06: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B07: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B08: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B09: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B11: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B12: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- B8A: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- SCL: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- WVP: 2313.05 MB, shape [1, 28638, 21173], dtype float32
- visual: 2313.05 MB, shape [1, 28638, 21173], dtype float32
**Spatial Dimensions:**
X (longitude): 21173 pixels
Y (latitude): 28638 pixels
Successfully estimated data size for 16 items
```
I fetched the latest Sentinel‑2 L2A acquisition over Haida Gwaii and estimated the size of all band assets that intersect the area.
## Result
- Total size (all bands and QA/visual) for the latest scene: ≈ 37.01 GB (decimal) ≈ 36.14 GiB (binary)
- Raw bytes: 38,806,551,936
- Items (granules/tiles) included: 16
- Acquisition time (latest): 2025‑09‑18T20:08:51Z (S2A)
### What’s included
- Spectral bands: B01, B02, B03, B04, B05, B06, B07, B08, B8A, B09, B11, B12
- QA/aux: AOT, SCL, WVP
- Visual RGB composite: visual
Each variable is estimated at ~2,313.05 MB (≈2.31 GB decimal) on the common mosaic grid, yielding the totals above.
- Spectral bands only (13 bands): ≈ 30.07 GB (decimal) ≈ 28.0 GiB (binary)
- All variables (13 bands + AOT + SCL + WVP + visual = 16): ≈ 37.01 GB (decimal) ≈ 36.14 GiB (binary)
## Notes
- Area of interest: Haida Gwaii bbox [-133.5, 52.0, -130.5, 54.5].
- Time window: limited to the most recent pass at 2025‑09‑18T20:08:51Z.
- The estimate is produced by lazily mosaicking tiles to a common grid and dtype (float32), resampling where needed, which reflects the memory footprint to work with all bands together.
If you’d like, I can break this down per tile or per band, or adjust for a different data type (e.g., uint16) to reflect raw file sizes rather than analysis-ready float32 grids.
