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Hi Ben, This is not an easy one, and there is no straight-forward way to accomplish this with GEMPAK. GDCROSS has no method to output incremental coordinate along CXSTNS, unfortunately. But if you were to calculate a series of points from your specified CXSTNS outside of GEMPAK, the capability to plot y-axis values along x-axis distance doesn't exist. The only idea I have, which is rather kludgy, would be to convert PWTR across a distance to "time domain" and overlay, with considerable tweaking of chart position, with GDTSER. That's about the only solution I can come up with at this point. Best, Michael James Unidata > I am plotting vertical cross sections from various reanalysis datasets with > gdcross and would like to supplement these cross sections with plots of > precipitable water (PW) along the cross section, where the x axis would be > distance along the cross section and the y axis would be the PW value. Do > you know of a way to do this? If I could at least obtain the lat/lon > coordinates to which the data along the cross section line were interpolated, > then I could just plug those coordinates into gdpoint to get the PW values > along the cross section. Is there a way to obtain these coordinates from > gdcross? > > I appreciate your assistance! > > -Ben > > Ticket Details =================== Ticket ID: IZI-585368 Department: Support GEMPAK Priority: Normal Status: Open