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Add support for data georeferenced by Ground Control Points (GCP) (Sentinel-1 case) #267

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Add support for data georeferenced by Ground Control Points (GCP) (Sentinel-1 case) #267

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6820c3c
https://github.com/gjoseph92/stackstac/issues/181#issuecomment-137402…
MathewNWSH Mar 11, 2025
5d9af58
Update rio_reader.py
MathewNWSH Mar 11, 2025
3cfe747
Update rio_reader.py
MathewNWSH Mar 11, 2025
3ebefba
Update raster_spec.py
MathewNWSH Mar 11, 2025
314248d
Update rio_reader.py
MathewNWSH Mar 11, 2025
05d148e
handle both S1 and S2
MathewNWSH Mar 11, 2025
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32 changes: 26 additions & 6 deletions stackstac/rio_reader.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,8 @@

import numpy as np
import rasterio as rio
from rasterio import transform
from rasterio.transform import from_gcps
from rasterio.vrt import WarpedVRT

from .rio_env import LayeredEnv
Expand Down Expand Up @@ -342,23 +344,41 @@ def _open(self) -> ThreadsafeRioDataset:
)

# Only make a VRT if the dataset doesn't match the spatial spec we want
if self.spec.vrt_params != {
"crs": ds.crs.to_epsg(),
"transform": ds.transform,
# Determine current spatial parameters based on GCP presence
if ds.gcps[0]: # Check if there are GCPs
current_crs = ds.gcps[1].to_epsg()
current_transform = transform.from_gcps(ds.gcps[0])
else:
current_crs = ds.crs.to_epsg()
current_transform = ds.transform

current_params = {
"crs": current_crs,
"transform": current_transform,
"height": ds.height,
"width": ds.width,
}:
}

if self.spec.vrt_params != current_params:
# Prepare VRT parameters
vrt_kwargs = dict(self.spec.vrt_params)
if ds.gcps[0]:
# Add GCP-based source parameters
vrt_kwargs.update({
"src_crs": ds.gcps[1],
"src_transform": current_transform,
"src_nodata": ds.nodata,
})
with self.gdal_env.open_vrt:
vrt = WarpedVRT(
ds,
sharing=False,
resampling=self.resampling,
add_alpha=ds.nodata is None,
**self.spec.vrt_params,
**vrt_kwargs,
)
else:
vrt = None

if ds.driver in MULTITHREADED_DRIVER_ALLOWLIST:
return ThreadLocalRioDataset(self.gdal_env, ds, vrt=vrt)
# ^ NOTE: this forces all threads to wait for the `open()` we just did before they can open their
Expand Down