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The gross features in the distribution of stars as well as warm (T >~ 100 K)interstellar dust in the Galactic disk have been investigated using the recentmid infrared survey by Midcourse Space Experiment (MSX) at 8, 12, 14 & 21micron bands. An attempt has been made to determine the location of theGalactic mid-plane at various longitudes, using two approaches : (i) fittingexponential functions to the latitude profiles and (ii) statisticalindicators.The former method is successful for the inner Galaxy (-90 < l < 90),and quantifies characteristic angular scales along latitude, which have beentranslated to linear scale heights (z_h) and radial length scales (R_l) usinggeometric description of the Galactic disk. The distribution of warm dust inthe Galactic disk is found to be characterised by R_l < 6 kpc and 60 < z_h <~100 pc, in agreement with other studies. The location of the Galactic mid-planeas a function of longitude, for stars as well as warm dust, has been searchedfor signatures of warp-like feature in their distribution, by fitting sinusoidwith phase and amplitude as parameters. In every case, the warp signature hasbeen detected. An identical analysis of the DIRBE/COBE data in all its tenbands covering the entire infrared spectrum (1.25-240 micron), also leads todetection of warp signatures with very similar phase as found from the MSXdata. Our results have been compared with those from other studies.Comment: To be published in 'Astronomy and Astrophysics' (12 pages including 9  figures & 4 tables

Warp signatures of the Galactic disk as seen in mid infrared from Midcourse Space Experiment