Robotic data acquisition of directional reflectance factors
Abstract
A data collection platform for rapid and repeatable positioning of a down-looking radiometer was constructed using commercially available instrumentation and hardware. The platform also accommodated a second radiometer to measure irradiance at the same instant the other radiometer measured target radiance. Stepper motors position the down-looking radiometer at programmed view zenith and view azimuth angles. A Polycorder and stepper motor interface control the stepper motors while data acquisition is the sole responsibility of the Polycorder. Less than 15 min is required to measure target radiance from a full set of measurements consisting of 182 combinations of view zenith and view azimuth angles. Positioning accuracy of the viewing radiometer is within + or - 0.2 deg for a nominal 15 deg angular movement. The system has proven to be dependable, easy to use, highly mobile, and adaptable.
- Publication:
-
Remote Sensing of Environment
- Pub Date:
- November 1989
- DOI:
- 10.1016/0034-4257(89)90058-8
- Bibcode:
- 1989RSEnv..30..159B
- Keywords:
-
- Canopies (Vegetation);
- Data Acquisition;
- Radiometers;
- Robotics;
- Spectral Reflectance;
- Optical Reflection;
- Position (Location);
- Systems Engineering