|
| 1 | +# Urban Sky Open Data |
| 2 | + |
| 3 | +Urban Sky recently provided open and freely available high-resolution aerial and thermal imagery captured from stratospheric Microballoons over the LA fires. The dataset includes both RGB imagery at 10cm resolution and Long-Wave Infrared (LWIR) thermal imagery at 3m resolution, with coverage focused on wildfire events and urban areas. The Microballoon platform operates at altitudes of 15-21km, providing a unique vantage point that avoids interference with firefighting aircraft while maintaining high-resolution imaging capabilities. |
| 4 | + |
| 5 | +## Technical Specifications of Images Shared |
| 6 | + |
| 7 | +#### RGB Imagery Specifications |
| 8 | + |
| 9 | +<center> |
| 10 | + |
| 11 | +| Parameter | Value | |
| 12 | +|-----------|--------| |
| 13 | +| Spatial Resolution | 10.0 cm | |
| 14 | +| Flight Altitude | 15-21 km | |
| 15 | +| Sensor Bands | Red, Green, Blue (RGB) | |
| 16 | +| Sensor Color Sampling | RGGB color filter array | |
| 17 | +| Sensor Dynamic Range | 12 bits per sample | |
| 18 | +| Product Dynamic Range | 8 bits per sample | |
| 19 | +| Single Path Swath Width | 10.5-15.0 km (altitude dependent) | |
| 20 | +| Off-nadir Look Angle | 20° ± 3° | |
| 21 | +| Geolocation Accuracy (CE90) | 3 meters | |
| 22 | +| File Format | Cloud-optimized GeoTiffs | |
| 23 | +| Processing | Non-uniformity correction, Edge preserving noise reduction, Adaptive tonal curves | |
| 24 | +| Compression | High-quality YCbCr JPEG | |
| 25 | + |
| 26 | +</center> |
| 27 | + |
| 28 | +### LWIR Thermal Imagery Specifications |
| 29 | + |
| 30 | +<center> |
| 31 | + |
| 32 | +| Parameter | Value | |
| 33 | +|-----------|--------| |
| 34 | +| Spatial Resolution | 3.0 m | |
| 35 | +| Flight Altitude | 15-21 km | |
| 36 | +| Spectral Band | 8μm - 14μm | |
| 37 | +| Swath Width | 10-18 km (altitude dependent) | |
| 38 | +| Coverage Rate | 50-1,500 km² per hour (1000 km²/hr typical) | |
| 39 | +| Scene Dynamic Range | High Gain: Up to 140°C, Low Gain: Up to 500°C | |
| 40 | +| Pixel Pitch | 12 μm | |
| 41 | +| Thermal Sensitivity | 60 mK | |
| 42 | +| Compatible Wind Speeds | 5-90 km/hr | |
| 43 | + |
| 44 | +</center> |
| 45 | + |
| 46 | +Note: STAC metadata was provided with the two images but there href links to the data were missing. |
| 47 | + |
| 48 | +#### Dataset Preprocessing |
| 49 | +The STAC metadata was parsed to create properties for the image band names were captures as red, green, blue or thermal to represent LWIR band. |
| 50 | + |
| 51 | +#### Citation |
| 52 | + |
| 53 | +Use the following copyright notice for any data products or derivatives: |
| 54 | + |
| 55 | +"©[YEAR] Urban Sky. All Rights Reserved." |
| 56 | + |
| 57 | +where [YEAR] reflects the year of image acquisition. |
| 58 | + |
| 59 | + |
| 60 | + |
| 61 | +#### Code Snippet |
| 62 | + |
| 63 | +```js |
| 64 | +var HIGHRES_RGB = ee.Image("projects/sat-io/open-datasets/URBAN_SKY/USKY01_D00236_010_11S_20250119_20250125200840_A0_000_000_01"); |
| 65 | +var LWIR_THERMAL = ee.Image("projects/sat-io/open-datasets/URBAN_SKY/USKY02_D00235_400_11S_20250119_20250121015227_A2_000_000_01"); |
| 66 | + |
| 67 | +Map.centerObject(LWIR_THERMAL,10) |
| 68 | +Map.addLayer(HIGHRES_RGB.mask(HIGHRES_RGB.gt(0)),{},'High Res RGB 10cm') |
| 69 | +Map.addLayer(LWIR_THERMAL, {min: 3, max: 215, palette: ['#313695', '#4575b4', '#74add1', '#abd9e9', '#fee090', '#fdae61', '#f46d43', '#d73027']}, 'LWIR Thermal 3m') |
| 70 | + |
| 71 | +var snazzy = require("users/aazuspan/snazzy:styles"); |
| 72 | +snazzy.addStyle("https://snazzymaps.com/style/15/subtle-grayscale", "Greyscale"); |
| 73 | +``` |
| 74 | + |
| 75 | +Sample code: https://code.earthengine.google.com/?scriptPath=users/sat-io/awesome-gee-catalog-examples:global-events-layers/URBAN-SKY-OPENDATA |
| 76 | + |
| 77 | +#### License |
| 78 | + |
| 79 | +This dataset is made available under Creative Commons Attribution 4.0 International License (CC BY 4.0). |
| 80 | + |
| 81 | +#### Contact |
| 82 | + |
| 83 | +For questions about the data or collaboration opportunities, contact Urban Sky at info@urbansky.com |
| 84 | + |
| 85 | +Provided by: Urban Sky |
| 86 | + |
| 87 | +Curated in GEE by: Samapriya Roy |
| 88 | + |
| 89 | +Keywords: aerial imagery, thermal imaging, wildfire monitoring, high-resolution imagery, microballoon, stratospheric imaging, LWIR, RGB imagery |
| 90 | + |
| 91 | +Last updated: 2025-02-11 |
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