This paper presents a conceptual system design by which the requirements of the Landsat mission, or Sentinel-2, or potential commercial missions may be accomplished and extended. For simplicity, I will just refer to Landsat or Smart Landsat (SL). These new methods enable the Landsat system to significantly increase the quality of the information acquired while meeting all of the requirements of the Landsat Mission. The key difference between the old and new Landsat system designs is in the data acquisition strategy. The traditional Landsat acquires images of all the Earth’s surface it passes over. This means that the vast majority of the data is redundant as most of the surface had not changed since the previous data acquisition. The Smart Landsat (SL) employs active data acquisition rather than passive. This means that it only acquires data from areas that are changing. In other words, it acquires Information.
Current optical remote sensing instrument technology allows the acquisition and digitization of all of the reflected energy (light) across the full spectral range of interest. The current method for acquiring, transmitting, and processing this data is still based on the "multi-band" approach that has been used for the past thirty years. This approach was required due to limitations imposed by early instrument technology. This paper will present generalized concepts for acquiring, pre-processing, transmitting, and extracting information from full-spectral, remotely sensed data. The goal of the paper is to propose methods for changing from the current "bytes-per-band" approach to the "spectral curve" approach. The paper will describe how the Full Spectral Imaging (FSI) approach has the potential to greatly simplify instrument characterization and calibration and to significantly reduce data transmission and storage requirements. I will suggest how these improvements may be accomplished with no loss of remotely sensed information.
A design for an advanced camera (AC) third-generation Hubble Space Telescope scientific instrument is discussed. The AC is a three-channel spectrophotometric camera with wavelength sensitivity from 115-1000 nm. The AC, if selected, would be launched in 1999 for installation on HST. The axial bay design incorporates optical correction for the aberrated HST primary mirror and evolutionary advances in imaging capability.
Some innovative approaches to the design of a 16 meter filled-aperture, UV to IR, high spatial resolution, wide field-of-view space telescope are presented. The purpose of this paper is to stimulate the discussion of innovative concepts for a second generation space telescope. The ideas in this paper are not tested or analyzed. They are simply concepts that might prove to be applicable and which will have to be tested and developed, and possibly rejected. Comments on the concepts presented in this paper will be welcomed by the author.
During the year 1992 a prototype airborne imaging spectrometer is developed in Finland. The instrument is in the first place developed for technology demonstration, performance verification and algorithm development. The first tests of the AISA (Airborne Imaging Spectrometer for different Applications) are performed during the end of 1992 and the beginning of 1993. This paper describes the instrument design concept and will list the first test results. The instrument has 288 spectral channels, a spatial resolution of 384 pixels across track and is through software flexible programmable. Targets during the development have been simplicity and robustness. Applications can be found in forestry, ecology, hydrology, geology, agriculture etc.