Add umbra SAR test image

Author: kylebarron

real_data/umbra/README.md

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+# Umbra
+
+Umbra Synthetic Aperture Radar (SAR) Open Data was accessed on 2026-02-05 from https://registry.opendata.aws/umbra-open-data.
+

real_data/umbra/sydney_airport.md

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+# Umbra Sydney Airport
+
+## Features
+
+- Rotated transform:
+
+    ```json
+    [
+        -0.0000025955530347975644,
+        -0.0000021620279292929635,
+        150.7563842406136,
+        -0.0000018031258572430161,
+        0.0000021646845467054394,
+        -33.8895671886414,
+    ]
+    ```
+
+## Misc
+
+```
+aws s3 cp --no-sign-request 's3://umbra-open-data-catalog/sar-data/tasks/Sydney International Airport, Australia/d1378053-398d-4ee6-87ab-e212c9b1aeb2/2024-05-11-23-06-40_UMBRA-04/2024-05-11-23-06-40_UMBRA-04_METADATA.json' sydney_airport.json
+```
+
+
+```bash
+pixi run gdal_translate \
+  -srcwin 0 0 512 512 \
+  -of COG \
+  "/vsis3/umbra-open-data-catalog/sar-data/tasks/Sydney International Airport, Australia/d1378053-398d-4ee6-87ab-e212c9b1aeb2/2024-05-11-23-06-40_UMBRA-04/2024-05-11-23-06-40_UMBRA-04_GEC.tif" \
+  sydney_airport_GEC.tif
+```
+
+For future reference, there are more TIFF images from the same directory:
+
+> aws s3 ls --no-sign-request 's3://umbra-open-data-catalog/sar-data/tasks/Sydney International Airport, Australia/d1378053-398d-4ee6-87ab-e212c9b1aeb2/2024-05-11-23-06-40_UMBRA-04/'
+2024-05-12 04:39:49  768106649 2024-05-11-23-06-40_UMBRA-04_CSI-SIDD.nitf
+2024-05-12 04:39:46  604071003 2024-05-11-23-06-40_UMBRA-04_CSI.tif
+2024-05-12 04:39:30  277018485 2024-05-11-23-06-40_UMBRA-04_GEC.tif
+2024-05-12 04:39:28       3699 2024-05-11-23-06-40_UMBRA-04_METADATA.json
+2024-05-12 04:39:32 4304478921 2024-05-11-23-06-40_UMBRA-04_SICD.nitf
+2024-05-12 04:39:29  256042603 2024-05-11-23-06-40_UMBRA-04_SIDD.nitf

real_data/umbra/sydney_airport_GEC.tif

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+```
+Driver: GTiff
+File: real_data/umbra/sydney_airport_GEC.tif
+COG: True
+Compression: LZW
+ColorSpace: None
+
+Profile
+    Width:            512
+    Height:           512
+    Bands:            1
+    Tiled:            False
+    Dtype:            uint8
+    NoData:           0.0
+    Alpha Band:       False
+    Internal Mask:    False
+    Interleave:       BAND
+    ColorMap:         False
+    ColorInterp:      ('gray',)
+    Scales:           (1.0,)
+    Offsets:          (0.0,)
+
+Geo
+    Crs:              EPSG:4326
+    Origin:           (150.7563842406136, -33.8895671886414)
+    Resolution:       (-2.5955530347975644e-06, 2.1646845467054394e-06)
+    BoundingBox:      (150.75394835916, -33.89049038908031, 150.7563842406136, -33.888458870153485)
+    MinZoom:          17
+    MaxZoom:          18
+
+Image Metadata
+    COLLECT_ID: 6e46e14b-0720-4d38-b4fd-a491ecc680cd
+    PROCESSOR: 3.43.0
+    AREA_OR_POINT: Area
+
+Image Structure
+    LAYOUT: COG
+    COMPRESSION: LZW
+    INTERLEAVE: BAND
+
+Rpc
+    ERR_BIAS: -1
+    ERR_RAND: -1
+    HEIGHT_OFF: 106.116335740878
+    HEIGHT_SCALE: 1414.21349959454
+    LAT_OFF: -33.8866775428042
+    LAT_SCALE: 0.013819079745951
+    LINE_DEN_COEFF: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+    LINE_NUM_COEFF: 1.0098779989075e-06 -0.38501437082481 0.462216632931494 -0.798687947201213 -6.17190300322365e-05 -0.00484175359631402 0.00116516419243311 6.58561487713817e-05 0.000103847721158506 -0.00284727171615102 1.21051536405306e-05 6.16205674448873e-07 6.31695927979249e-07 -6.59338988132785e-05 -1.22169656133674e-07 -1.43354453180285e-07 1.49620932270288e-05 -2.72942292713413e-05 -7.17064034479286e-07 -2.88261816227815e-05
+    LINE_OFF: 8000
+    LINE_SCALE: 8153.89423198476
+    LONG_OFF: 150.718321214111
+    LONG_SCALE: 0.0165696913542446
+    SAMP_DEN_COEFF: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+    SAMP_NUM_COEFF: 8.79302169772598e-07 -0.537036149635479 -0.447337119051056 -0.715061735719837 -8.62779905929847e-05 -0.00426041571575538 0.000825411835189034 0.000128407466366373 9.39424602473292e-05 -0.0024791209788296 1.05327229351041e-05 5.39343566267642e-07 5.55897060722365e-07 -5.7408680324816e-05 -9.49142790245069e-08 -1.16647580051188e-07 1.30275024158286e-05 -2.37493589667929e-05 -6.23776683897462e-07 -2.50989714899456e-05
+    SAMP_OFF: 8000
+    SAMP_SCALE: 7017.89894898137
+
+Band 1
+    ColorInterp: gray
+
+IFD
+    Id      Size           BlockSize     Decimation
+    0       512x512        512x512       0
+    1       256x256        512x512       2
+    2       128x128        512x512       4
+```