Paper:	Photometric Calibration and DAs in the SDSS
Volume:	372, 15th European Workshop on White Dwarfs
Page:	289
Authors:	Engelbrecht, A.; Koester, D.
Abstract:	We determine zero-points for the theoretical calculation of SDSS ugriz magnitudes. A two-color diagram u−g vs. g−r is then used to show that the average surface gravity of DA white dwarfs in the SDSS data release 4 does not increase below 12000 K, if determined from photometry instead of spectra.

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