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import json
import pytest
import pystac
from pystac import ExtensionTypeError, Item
from pystac.extensions.raster import (
DataType,
Histogram,
NoDataStrings,
RasterBand,
RasterExtension,
Sampling,
Statistics,
)
from pystac.utils import get_opt
from tests.conftest import get_data_file
from tests.utils import TestCases, assert_to_from_dict
PLANET_EXAMPLE_URI = get_data_file("raster/raster-planet-example.json")
@pytest.fixture
def ext_item() -> pystac.Item:
return pystac.Item.from_file(PLANET_EXAMPLE_URI)
SENTINEL2_EXAMPLE_URI = TestCases.get_path(
"data-files/raster/raster-sentinel2-example.json"
)
LANDSAT_COLLECTION_EXAMPLE_URI = TestCases.get_path(
"data-files/raster/landsat-collection-example.json"
)
def test_to_from_dict() -> None:
with open(PLANET_EXAMPLE_URI) as f:
item_dict = json.load(f)
assert_to_from_dict(Item, item_dict)
@pytest.mark.vcr()
def test_validate_raster(ext_item: pystac.Item) -> None:
item2 = pystac.Item.from_file(SENTINEL2_EXAMPLE_URI)
ext_item.validate()
item2.validate()
@pytest.mark.vcr()
def test_asset_bands(ext_item: pystac.Item) -> None:
item2 = pystac.Item.from_file(SENTINEL2_EXAMPLE_URI)
# Get
data_asset = ext_item.assets["data"]
asset_bands = RasterExtension.ext(data_asset).bands
assert asset_bands is not None
assert len(asset_bands) == 4
assert asset_bands[0].nodata == 0
assert asset_bands[0].sampling == Sampling.AREA
assert asset_bands[0].unit == "W⋅sr−1⋅m−2⋅nm−1"
assert asset_bands[0].data_type == DataType.UINT16
assert asset_bands[0].scale == 0.01
assert asset_bands[0].offset == 0
assert asset_bands[0].spatial_resolution == 3
band0_stats = asset_bands[0].statistics
assert band0_stats is not None
assert band0_stats.minimum == 1962
assert band0_stats.maximum == 32925
assert band0_stats.mean == 8498.9400644319
assert band0_stats.stddev == 5056.1292002722
assert band0_stats.valid_percent == 61.09
band0_hist = asset_bands[0].histogram
assert band0_hist is not None
assert band0_hist.count == 256
assert band0_hist.min == 1901.288235294118
assert band0_hist.max == 32985.71176470588
assert len(band0_hist.buckets) == band0_hist.count
index_asset = ext_item.assets["metadata"]
asset_bands = RasterExtension.ext(index_asset).bands
assert None is asset_bands
b09_asset = item2.assets["B09"]
b09_bands = RasterExtension.ext(b09_asset).bands
assert b09_bands is not None
assert b09_bands[0].nodata == "nan"
# Set
b2_asset = item2.assets["B02"]
assert (
get_opt(get_opt(RasterExtension.ext(b2_asset).bands)[0].statistics).maximum
== 19264
)
b1_asset = item2.assets["B01"]
RasterExtension.ext(b2_asset).bands = RasterExtension.ext(b1_asset).bands
new_b2_asset_bands = RasterExtension.ext(item2.assets["B02"]).bands
assert get_opt(get_opt(new_b2_asset_bands)[0].statistics).maximum == 20567
new_b2_asset_band0 = get_opt(new_b2_asset_bands)[0]
new_b2_asset_band0.nodata = NoDataStrings.INF
item2.validate()
# Check adding a new asset
new_stats = [
Statistics.create(
minimum=0, maximum=10000, mean=5000, stddev=10, valid_percent=88
),
Statistics.create(minimum=-1, maximum=1, mean=0, stddev=1, valid_percent=100),
Statistics.create(
minimum=1, maximum=255, mean=200, stddev=3, valid_percent=100
),
]
# new_histograms = []
with open(TestCases.get_path("data-files/raster/gdalinfo.json")) as gdaljson_file:
gdaljson_data = json.load(gdaljson_file)
new_histograms = list(
map(
lambda band: Histogram.from_dict(band["histogram"]),
gdaljson_data["bands"],
)
)
new_bands = [
RasterBand.create(
nodata=1,
unit="test1",
statistics=new_stats[0],
histogram=new_histograms[0],
),
RasterBand.create(
nodata=2,
unit="test2",
statistics=new_stats[1],
histogram=new_histograms[1],
),
RasterBand.create(
nodata=NoDataStrings.NINF,
unit="test3",
statistics=new_stats[2],
histogram=new_histograms[2],
),
]
asset = pystac.Asset(href="some/path.tif", media_type=pystac.MediaType.GEOTIFF)
RasterExtension.ext(asset).bands = new_bands
ext_item.add_asset("test", asset)
assert len(ext_item.assets["test"].extra_fields["raster:bands"]) == 3
assert (
ext_item.assets["test"].extra_fields["raster:bands"][1]["statistics"]["minimum"]
== -1
)
assert (
ext_item.assets["test"].extra_fields["raster:bands"][1]["histogram"]["min"]
== 3848.354901960784
)
assert ext_item.assets["test"].extra_fields["raster:bands"][2]["nodata"] == "-inf"
for s in new_stats:
s.minimum = None
s.maximum = None
s.mean = None
s.stddev = None
s.valid_percent = None
assert len(s.properties) == 0
for b in new_bands:
b.bits_per_sample = None
b.data_type = None
b.histogram = None
b.nodata = None
b.sampling = None
b.scale = None
b.spatial_resolution = None
b.statistics = None
b.unit = None
b.offset = None
assert len(b.properties) == 0
new_stats[2].apply(minimum=0, maximum=10000, mean=5000, stddev=10, valid_percent=88)
new_stats[1].apply(minimum=-1, maximum=1, mean=0, stddev=1, valid_percent=100)
new_stats[0].apply(minimum=1, maximum=255, mean=200, stddev=3, valid_percent=100)
new_bands[2].apply(
nodata=1,
unit="test1",
statistics=new_stats[2],
histogram=new_histograms[0],
)
new_bands[1].apply(
nodata=2,
unit="test2",
statistics=new_stats[1],
histogram=new_histograms[1],
)
new_bands[0].apply(
nodata=NoDataStrings.NAN,
unit="test3",
statistics=new_stats[0],
histogram=new_histograms[2],
)
RasterExtension.ext(ext_item.assets["test"]).apply(new_bands)
assert (
ext_item.assets["test"].extra_fields["raster:bands"][0]["statistics"]["minimum"]
== 1
)
assert ext_item.assets["test"].extra_fields["raster:bands"][0]["nodata"] == "nan"
def test_extension_not_implemented(ext_item: pystac.Item) -> None:
# Should raise exception if Item does not include extension URI
ext_item.stac_extensions.remove(RasterExtension.get_schema_uri())
# Should raise exception if owning Item does not include extension URI
asset = ext_item.assets["data"]
with pytest.raises(pystac.ExtensionNotImplemented):
_ = RasterExtension.ext(asset)
# Should succeed if Asset has no owner
ownerless_asset = pystac.Asset.from_dict(asset.to_dict())
_ = RasterExtension.ext(ownerless_asset)
def test_ext_add_to(ext_item: pystac.Item) -> None:
ext_item.stac_extensions.remove(RasterExtension.get_schema_uri())
asset = ext_item.assets["data"]
_ = RasterExtension.ext(asset, add_if_missing=True)
assert RasterExtension.get_schema_uri() in ext_item.stac_extensions
def test_should_raise_exception_when_passing_invalid_extension_object() -> None:
with pytest.raises(
ExtensionTypeError, match=r"^RasterExtension does not apply to type 'object'$"
):
# calling it wrong on purpose so --------v
RasterExtension.ext(object()) # type: ignore
def test_summaries_adds_uri() -> None:
col = pystac.Collection.from_file(LANDSAT_COLLECTION_EXAMPLE_URI)
col.stac_extensions = []
with pytest.raises(
pystac.ExtensionNotImplemented,
match="Extension 'raster' is not implemented",
):
RasterExtension.summaries(col, add_if_missing=False)
RasterExtension.summaries(col, True)
assert RasterExtension.get_schema_uri() in col.stac_extensions
RasterExtension.remove_from(col)
assert RasterExtension.get_schema_uri() not in col.stac_extensions
def test_collection_item_asset() -> None:
coll = pystac.Collection.from_file(LANDSAT_COLLECTION_EXAMPLE_URI)
assert coll.item_assets
qa = coll.item_assets["qa"]
ang = coll.item_assets["ang"]
assert qa.ext.raster.bands is not None
assert ang.ext.raster.bands is None
def test_older_extension_version(ext_item: pystac.Item) -> None:
old = "https://stac-extensions.github.io/raster/v1.0.0/schema.json"
new = "https://stac-extensions.github.io/raster/v1.1.0/schema.json"
stac_extensions = set(ext_item.stac_extensions)
stac_extensions.remove(new)
stac_extensions.add(old)
item_as_dict = ext_item.to_dict(include_self_link=False, transform_hrefs=False)
item_as_dict["stac_extensions"] = list(stac_extensions)
item = pystac.Item.from_dict(item_as_dict, migrate=False)
assert RasterExtension.has_extension(item)
assert old in item.stac_extensions
migrated_item = pystac.Item.from_dict(item_as_dict, migrate=True)
assert RasterExtension.has_extension(migrated_item)
assert new in migrated_item.stac_extensions
|
