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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.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.
Hi Kevin, If I understand you correctly, you are overlaying surface data on top of radar image files by calling multiple instances of GPMAP in a script. Unfortunately there's no easy way to accomplish what you want: to generate surface data overlays once once per hour while generating radar image layers more often. A more labor-intensive option may be: Create surface map files (gif) once per hour in the cron and in the same script file make a call to the ImageMagick program 'convert' to set a single color transparent: "convert surface.gif -transparent black surface-transparent.gif" and then overlay this transparent gif on top of the more frequently made radar images with another called to convert in the radar generation shell script: "convert radar.gif surface-transparent.gif -compose over plot.gif" where plot.gif is the final product. This method requires the image/data projections be identical or it simply won't look correct - it uses programs outside of GEMPAK and will take some experimentation to get right if you choose to play around with it. Michael James Unidata User Support > Hi, > > I have a question/problem I am trying to figure out and need some help. I > am running a script which creates a radar images of certain areas and > uploading that to a webpage. I am also creating overlay graphics for the > same areas (i.e., sfcplot, heights, wind contours, instability, etc). The > problem is I have my script creating the overlays every time the radar > script runs, which is several times an hour. I only need the overlays once > an hour. I am not sure how to create the overlays just once per hour > without the radar image. I want to keep it in the radar projection (proj = > rad). But how can I make an overlay using GPMAP with the radar image not > showing? I just want the background map and then I can overlay it onto the > radar images I have in my loop. Right now the way my script reads is I > create the radar image, then using the same projection and garea...I create > the overlays using the clear=no option. Obviously this is not the most > efficient way to do this....so if you can assist me I would really > appreciate it. Thanks. > > Kevin > Ticket Details =================== Ticket ID: WUQ-124584 Department: Support GEMPAK Priority: Normal Status: Open