Imaging Spectrometers/Radiometers
PRISM
The Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) is a panchromatic radiometer with 2.5-meter spatial resolution. Its data will be used for extracting highly accurate digital elevation model (DEM). The PRISM has three independent optical systems for nadir, forward and backward looking to achieve along-track stereoscopy. Each telescope consists of three mirrors and several CCD detectors for pushbroom scanning. The nadir-looking telescope provides 70 km width coverage; forward and backward telescopes provide 35 km width coverage each. The telescopes are installed on both side of its optical bench with precise temperature control. Forward and backward telescopes are inclined + and - 24 degrees from nadir to realize a base-to-height ratio of 1.0. PRISM's wide field of view (FOV) provides fully overlapped three-stereo (triplet) images (35 km width) without mechanical scanning or yaw steering of the satellite. Without this wide FOV, forward, nadir, and backward looking images would not overlap each other due to the Earth's rotation. [Summary provided by JAXA.] Group: Instrument_Details Entry_ID: PRISM Group: Instrument_Identification Instrument_Category: Earth Remote Sensing Instruments Instrument_Class: Passive Remote Sensing Instrument_Type: Spectrometers/Radiometers Instrument_Subtype: Imaging Spectrometers/Radiometers Short_Name: PRISM Long_Name: Panchromatic Remote-sensing Instrument for Stereo Mapping End_Group Group: Associated_Platforms Short_Name: ALOS End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Visible Spectral_Frequency_Coverage_Range: 0.52 μm - 0.77 μm End_Group Online_Resource: http://www.eorc.jaxa.jp/hatoyama/satellite/sendata/prism_e.html Sample_Image: http://www.eorc.jaxa.jp/hatoyama/satellite/sendata/image/prism_image.jpg Group: Instrument_Logistics Instrument_Owner: JAPAN/JAXA End_Group End_Group