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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
>From: David Ovens <address@hidden> >Organization: . >Keywords: 200003142021.NAA13569 >Hello, > >I've checked the archives and have not found out how to zoom a GOES-10 >(west coast) satellite image in GPMAP so that the left and right top >edges of the display are off the planet. Using garea = dset works >fine, of course, displaying the planet's limb on both edges and it >also works in GARP to zoom. But in GPMAP, "cursor garea" and anything >else I try fails, basically, because that upper left corner is out of >bounds in lat/lon space (e.g., cursor garea gives something like >29.3;179.6;-9999.0;-9999.0). > >I've gone as far as looking into imisub.f, hoping to be able to get >away from lat.s/lon.s to use another coordinate system, such as pixel >location in the satellite image. So, I am willing to modify code as >appropriate, obviously someone figured a way to do it in GARP. > >Is there a way that I haven't figured out yet to do this in GPMAP? Is >there anyone working on this feature for release 6? > >Thank you for any help and information, > >David >-- > >David Ovens e-mail: address@hidden >(206) 685-8108 >Dept of Atmospheric Sciences, Box 351640 >University of Washington >Seattle, WA 98195 > David, Garp gets around the problem by loading the entire image into a shadow buffer and then displaying the portion of the pixels within the view window. In effect, you are in graphic coordinates rather than lat/lon coordinates which is why Garp is displaying the XY cursor location. NMAP has a similar feature called "roaming" where a "panning" icon is used to display a viewport of a larger image (this allows the user to roam within an image without having to unzoom and zoom into a different region). The "cursor garea" zoom does not work as you mention because the lat/lon points in space are not defined. With Gini images, the Gempak program sector will allow the user to create a new region by sampling the data region directly. Unfortunately, sector does not support area files. To do that, you have to use McIDAS to write a new AREA file of the portion of the AREA file you need. Steve Chiswell