ALOS-2/CIRC L1 Radiance

ALOS-2/CIRC L1 Radiance is obtained by Compact Infrared Camera (CIRC) onboard ALOS-2 and produced by the Japan Aerospace Exploration Agency (JAXA). The Advanced Land Observing Satellite-2 (ALOS-2, "DAICHI-2") is Sun-synchronous sub-recurrent Orbit satellite launched on May 24, which is a follow-on mission from the ALOS "Daichi". CIRC is an infrared sensor primarily intended for detecting forest fires, which present a serious problem for the various countries of Southeast Asia, particularly considering the effects of global warming and climate change. The spatial resolution and field of view are 210 m and 128 km × 96 km from an altitude of 628 km in the case of ALOS-2. Main characteristic of the CIRC is also an athermal optics. The athermal optics compensates the defocus due to the temperature change by using Germanium and Chalcogenide glass which have different coefficient of thermal expansion and temperature dependence of refractive index.This dataset includes radiance data derived from Level 0 data and the radiometric correction applied. The physical quantity is W/um/sr/m^2.The provided format is GeoTIFF. The spatial resolution is about 210 m. The projection method is UTM. The current version is 11.0.

ALOS-2/CIRC L1 辐射度数据由搭载于 ALOS-2 上的紧凑型红外相机（CIRC）采集，并由日本宇宙航空研究开发机构（JAXA）生成。高级陆地观测卫星-2（ALOS-2，又称“DAICHI-2”），是一颗于 2014 年 5 月 24 日发射的太阳同步子回归轨道卫星，作为 ALOS “Daichi”的后续任务。CIRC 是一种主要用于监测森林火灾的红外传感器，这对于东南亚各国而言是一个严重的问题，尤其是考虑到全球变暖和气候变化的影响。在 ALOS-2 的高度 628 公里处，CIRC 的空间分辨率为 210 米，视场范围为 128 公里 × 96 公里。CIRC 的主要特性还包括了等温光学系统。该系统通过使用具有不同热膨胀系数和折射率温度依赖性的锗和硫族化合物玻璃来补偿由于温度变化引起的模糊。本数据集包括从级数 0 数据中提取的辐射度数据，并应用了辐射校正。物理量为 W/um/sr/m^2。提供的数据格式为 GeoTIFF。空间分辨率约为 210 米。投影方法为 UTM。当前版本为 11.0。