  We present an optically selected galaxy cluster catalog from ~ 2,700 square
degrees of the Digitized Second Palomar Observatory Sky Survey (DPOSS),
spanning the redshift range 0.1 < z < 0.5, providing an intermediate redshift
supplement to the previous DPOSS cluster survey. This new catalog contains
9,956 cluster candidates and is the largest resource of rich clusters in this
redshift range to date. The candidates are detected using the best DPOSS plates
based on seeing and limiting magnitude. The search is further restricted to
high galactic latitude (|b| > 50), where stellar contamination is modest and
nearly uniform. We also present a performance comparison of two different
detection methods applied to this data, the Adaptive Kernel and Voronoi
Tessellation techniques. In the regime where both catalogs are expected to be
complete, we find excellent agreement, as well as with the most recent surveys
in the literature. Extensive simulations are performed and applied to the two
different methods, indicating a contamination rate of ~ 5%. These simulations
are also used to optimize the algorithms and evaluate the selection function
for the final cluster catalog. Redshift and richness estimates are also
provided, making possible the selection of subsamples for future studies.
