Scott - I'm a little rusty here but I am pretty sure you need to create a new grid with all values set to 0 and the same number of cells as your bathymetry...then you 'drape' the nautical chart on this grid and not the bathymetry grid - should get you there...
Will Mitchell Mitchell Geographics, Inc. 496 Congress St Portland, ME 04101 ph 207.879.7769 fx 207.253.5756 www.mitchellgeo.com -----Original Message----- From: Lewis,Scott [Dartmouth] [mailto:[EMAIL PROTECTED] Sent: Friday, April 01, 2005 1:28 PM To: [email protected] Subject: MI-L Re: Grid overlays using Vertical Mapper Hello, Perhaps someone might be able to suggest a solution to my problem; or point me in the right direction: I have some multibeam data (seafloor bathymetry) in grid format that I want to overlay with some raster navigational charts using Vertical Mapper. I am relatively new to Vertical mapper, but so far I have turned the charts (.tif files) into 'drape' files and have added them onto the multibeam grid (in the 3d viewer). My problem is that I don't know how to 'zero' the chart to equal mean sea level. When I overlay the chart with the multibeam, the multibeam appears to hover well above the chart itself. What I would like to do is be able to see is the chart lying flat @ mean sea level, and the seafloor depths appearing below the chart surface. The depths are currently in negative numbers and I would like to assign 'zero' values to the raster chart. I believe the number of cells differs b/w the chart and the multibeam grid. I do not use MapBasic, so any 'simpler' solutions would be much appreciated. Thanks, Scott --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 15902
