Experimental ZCTA Power Loss Map for US Winter Storm January 2026

This dataset is experimental and should only be used for situational awareness and data corroboration. Derived power loss maps are processed data based off Black Marble BRDF nighttime light observations. This data is available at: https://gis.earthdata.nasa.gov/portal/home/item.html?id=9f23e55f980044bfa1e8b6c4fb3ab579 Dates of Image: Pre-Event: December 2025 Composite Post-Event: January 26, 2026 Methodology: Only a subset of the raw black marble data was used. Note that while the Disasters team has clipped data to remove false positives, some observations may be obscured by total or partial cloud cover. Other factors such as snow reflectance, moon phase, wildfires, and wildfire smoke may distort light radiance and require further analysis when assessing power outages. Certain areas were filtered out into an “Analyzed areas” map, which shows subsets of counties that were retained after certain data extents were removed: Baseline (December 2025) low radiance (<1) is removed from the county geometry as it is background. Cloud cover from the date of interest (in this example, January 26th) is removed from the county geometry. Counties are only included within the bounding box of the Black Marble data that was provided. Once the extent was finalized, the Black Marble Data was modified: Negative out-of-range values were changed to 0. The revised black marble pixels were extracted to the analyzed area geometry: The difference between pre and post-event total light intensity in each county was calculated to measure percent light intensity loss. This is indicated in popups as Light Intensity Loss (percentage). The percentage of analyzed area (with area omitted due to being background in the baseline or cloud-covered in the day of Black Marble) is also available in the attribute table. Lower values may reflect lower confidence in the percent Power Loss depending on where the cloud cover is, especially in circumstances where the primary light source in a given geometry is obfuscated. Suggested Use: NASA's Black Marble Nighttime Light product suite is a state-of-the-art daily global collection of standard products for monitoring nighttime lights (NTL). Utilizing the Visible Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB) aboard the Suomi-NPP, NOAA-20, and NOAA-21 satellites. Grey represents cloud cover. Note that these maps are experimental and subject to change and development and should be used only for situational awareness. Satellite/Sensor: Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB) onboard the Suomi National Polar-orbiting Platform (SNPP), NOAA-20, and NOAA-21 SNPP: August 2024 composite, September 22-24, 2024, October 1, 2024 NOAA-20: September 25 - September 31, 2024, October 2, 2024 - October 4, 2024 Resolution: 500 meters Credits: NASA Black Marble Science team Disasters Response Coordination System Please cite the following two references when using this data: Román MO, Stokes EC, Shrestha R, Wang Z, Schultz L, Carlo EA, Sun Q, Bell J, Molthan A, Kalb V, Ji C. Satellite-based assessment of electricity restoration efforts in Puerto Rico after Hurricane Maria. PloS one. 2019 Jun 28;14(6):e0218883. Román MO, Wang Z, Sun Q, Kalb V, Miller SD, Molthan A, Schultz L, Bell J, Stokes EC, Pandey B, Seto KC. NASA's Black Marble nighttime lights product suite. Remote Sensing of Environment. 2018 Jun 1;210:113-43. Point of Contact: Ranjay Shrestha NASA Goddard Space Flight Center E-mail: [e-mail] Additional Links: NASA’s Black Marble Product Suite Román, M.O. et al. (2019) Satellite-based assessment of electricity restoration efforts in Puerto Rico after Hurricane Maria. PLoS One, 14 (6). Román, M.O. et al. (2018) NASA’s Black Marble nighttime lights product suite. Remote Sensing of Environment. 210, 113–143. Esri REST Endpoint: See individual layers below for source data.本数据集为试验性数据，仅可用于态势感知与数据佐证。派生得到的电力损失地图是基于黑大理石（Black Marble）双向反射分布函数（BRDF）夜间遥感观测数据处理得到的二次数据。本数据获取地址为：https://gis.earthdata.nasa.gov/portal/home/item.html?id=9f23e55f980044bfa1e8b6c4fb3ab579 图像采集时段：事件前：2025年12月合成数据；事件后：2026年1月26日 处理方法：仅使用了原始黑大理石数据集的子集。需注意，尽管灾害响应团队已对数据进行裁剪以去除误报，但部分观测结果仍可能被完全或部分云覆盖遮挡。其他因素如积雪反射率、月相、野火及野火烟雾均可能干扰光辐射信号，在评估电力中断情况时需开展进一步分析。 部分区域被筛选至「分析区域」地图中，该地图展示了在移除特定数据范围后保留的县（郡）子集：1. 移除基准期（2025年12月）辐射亮度低于1的像元，因其属于背景噪声；2. 移除目标观测日期（本示例为2026年1月26日）的云覆盖区域，将其从县（郡）几何范围中剔除；3. 仅保留在提供的黑大理石数据边界框（bounding box）范围内的县（郡）。 在确定数据范围后，对黑大理石数据进行如下处理：将超出有效范围的负值统一修正为0。将修正后的黑大理石像元提取至分析区域几何范围内：计算每个县（郡）的事件前后总光强差值，以量化光强损失百分比，该结果将在弹窗中以「光强损失百分比（Light Intensity Loss (percentage)）」形式展示。属性表中还提供了分析区域占比（该占比因基准期背景噪声或观测当日云覆盖被剔除）。根据云覆盖位置的不同，较低的百分比可能对应较低的电力损失估算置信度，尤其当特定几何区域的主要光源被遮挡时。 建议使用场景：NASA黑大理石（Black Marble）夜间灯光产品套件是用于监测夜间灯光（NTL）的顶尖每日全球标准产品集，其依托搭载于Suomi-NPP、NOAA-20及NOAA-21卫星上的可见光红外成像辐射仪套件（VIIRS）昼夜波段（DNB）获取数据。地图中灰色区域代表云覆盖。需注意，本类地图仍处于试验阶段，可能随开发迭代调整，仅可用于态势感知用途。 卫星/传感器：Suomi国家极轨运行卫星平台（SNPP）、NOAA-20及NOAA-21搭载的可见光红外成像辐射仪套件（VIIRS）昼夜波段（DNB）。其中SNPP数据合成时段为2024年8月、2024年9月22-24日、2024年10月1日；NOAA-20数据合成时段为2024年9月25日至9月31日、2024年10月2日至10月4日。 空间分辨率：500米 致谢：NASA黑大理石科学团队、灾害响应协调系统 使用本数据时，请引用以下两篇文献： Román MO, Stokes EC, Shrestha R, Wang Z, Schultz L, Carlo EA, Sun Q, Bell J, Molthan A, Kalb V, Ji C. 飓风玛丽亚过境波多黎各后基于卫星的电力恢复成效评估. PLoS ONE. 2019年6月28日;14(6):e0218883. Román MO, Wang Z, Sun Q, Kalb V, Miller SD, Molthan A, Schultz L, Bell J, Stokes EC, Pandey B, Seto KC. NASA黑大理石夜间灯光产品套件. 环境遥感. 2018年6月1日;210:113-143. 联系人：Ranjay Shrestha，NASA戈达德航天飞行中心；电子邮箱：[e-mail] 附加链接：NASA黑大理石产品套件；Román, M.O.等(2019) 飓风玛丽亚过境波多黎各后基于卫星的电力恢复成效评估. PLoS ONE, 14(6).；Román, M.O.等(2018) NASA黑大理石夜间灯光产品套件. 环境遥感, 210, 113–143. Esri REST端点：请参阅下方各图层获取源数据。