  We have compiled a new sample of galaxies with published catalogs of HII
region coordinates. This sample, together with the former catalog of
Garcia-Gomez and Athanassoula (1991) will form the basis for subsequent studies
of the spiral structure in disc galaxies. In this paper we address the problem
of the deprojection of the galaxy images. For this purpose we use two
deprojection methods based on the HII region distribution and compare the
results with the values found in the literature using other deprojection
methods. Taking into account the results of all the methods, we propose optimum
values for the position and inclination angles of all the galaxies in our
sample.
