3 Responses to Ideas for topics?

1. Dr. Mohammed Dabboor says:

   August 28, 2012 at 7:30 pm

   Hi Mark,

   I would like to hear about GPU programming and IDL. I want to know how OpenCL is connected with IDL. In general, high-speed programming is of interest for me and I guess for many people who needs to process huge volume of data!

   Reply
   • Mark says:

     August 29, 2012 at 8:49 am

     I strongly recommend following Mike Galloy and his work on GPULib; Mike has started work on porting GPULib to OpenCL.

     Reply
2. David Fanning says:

   September 4, 2012 at 3:26 pm

   I would like to know how to display a map projected image properly. Here is the code to obtain the image I am interested in:

   googleStr = “http://maps.googleapis.com/maps/api/staticmap?” + $
   “center=40.6000,-105.1000&zoom=12&size=600×600″ + $
   “&maptype=terrain&sensor=false&format=png32″
   netObject = Obj_New(‘IDLnetURL’)
   void = netObject -> Get(URL=googleStr, FILENAME=”googleimg.png”)
   Obj_Destroy, netObject
   googleImage = Read_Image(‘googleimg.png’)

   And here is the map projection information for the image:
   proj = “mercator”
   ellipsoid = “WGS84″
   centerLat = 40.600
   centerLon = -105.100
   limit = [-84.7500, -180.000, 84.7500, 180.000]
   xrange = [-11711131.0D, -11688226.0D]
   yrange = [4914254.0D, 4937159.5D]

   Here is how I have tried to display it:

   obj = Image(googleImage, /BOX_AXES, $
   map_projection=proj, ellipsoid=ellipsoid, $
   Center_Latitude=centerLat, Center_Longitude=centerLon, $
   LIMIT=limit, XRANGE=xrange, YRANGE=yrange, GRID_UNITS=1, $
   DIMENSIONS=[700,700], LOCATION=[50,50])

   I get a completely blank window. I would appreciate knowing how to do this correctly. My eventual goal is to have the cursor report the latitude and longitude from the image as I move my cursor over it.

   This should look similar to the image on this page:

   http://www.idlcoyote.com/map_tips/googlemap.php

   Thanks,

   David

   Reply

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