Arecibo radar imaging and Doppler spectroscopy
==============================================

The Arecibo Observatory Planetary Radar system was used to observe asteroids
and planetary surfaces with its 12.6 cm (2380 MHz) and 70-cm (430 MHz) radar
systems. This investigation provides processed data from Doppler-only
spectroscopy and delay-Doppler imaging of those bodies. The Doppler spectra
are presented as comma-separated-value data tables with metadata as additional
tables in the same file. The images are presented as FITS-format images with
World Coordinate System headers describing the delay-Doppler coordinates of
the images. Where possible, scale factors for transformation to SI units are
provided. These are available in most cases for Doppler spectra but only
rarely for images.

Most of the data in this investigation was of small bodies, but data from
other targets (planets and moons) are also included. Most of the data are from
after the "Gregorian Upgrade" of the telescope in the late 1990s, as earlier
data were rarely preserved due to data volume and loss of knowledge of the
organization of the data.