India’s second-generation earth observation satellite series started with the launch of IRS-1C in December 1995, twenty-five years ago. It is considered to be a “game changer” for Indian earth observation program. With a 5.8 m panchromatic (PAN) camera onboard, IRS-1C became the highest spatial resolution civilian operational satellite at the time of launch and maintained this status till the launch of IKONOS satellite in 1999. IRS-1C also had a unique feature of 3-tier imaging geometry that drew the attention of global remote sensing user community. Other than the PAN camera, the 23.5 m multispectral camera including a shortwave infrared band and the high repetitive coarse-resolution two-band camera facilitated many newer applications and scientific investigations. Commercially, it was one of the most successful missions of the IRS program. The lessons learnt from this mission were even more significant, as these have led to many dedicated theme-missions subsequently.

中文翻译：

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记住 IRS-1C 任务：印度地球观测计划的“游戏规则改变者”

印度的第二代地球观测卫星系列始于 25 年前的 1995 年 12 月 IRS-1C 的发射。它被认为是印度地球观测计划的“游戏规则改变者”。IRS-1C 搭载 5.8 m 全色 (PAN) 相机，成为发射时空间分辨率最高的民用卫星，并一直保持这一地位，直到 1999 年 IKONOS 卫星发射。 IRS-1C 还具有 3 -层成像几何，引起了全球遥感用户社区的关注。除了 PAN 相机，23.5 m 多光谱相机包括短波红外波段和高重复粗分辨率双波段相机，促进了许多新的应用和科学研究。在商业上，它是 IRS 计划中最成功的任务之一。