; This example code illustrates how to access and visualize GES DISC
;  AIRS Grid HDF-EOS2 file in IDL via OPeNDAP.
;
; If you have any questions, suggestions, comments  on this example, 
;  please use the HDF-EOS Forum (http://hdfeos.org/forums).
;
; Tested under: IDL 8.0 & idl-client-3.6.1 & ocapi-1.4.3 & curl-7.14.0
; Last updated: 2012-04-25

; Open remote file.
url = 'http://eosdap.hdfgroup.uiuc.edu:8080/opendap/data/NASAFILES/hdf4/AIRS.2008.10.27.L3.RetStd001.v5.2.2.0.G08303124144.hdf'
stat = OPENDAP_GET(url, data, mode='data')
PRINT, stat

; Print variable names available from the remote file.
HELP, /str, data
dataset = data.TOPOGRAPHYU274.TOPOGRAPHYU274
lat = data.LATITUDEU271.LATITUDEU271
lon = data.LONGITUDEU272.LONGITUDEU272
levels = 12
DEVICE, DECOMPOSED=0
LOADCT, 33, NCOLORS=12, BOTTOM=3
WINDOW, 0, TITLE='AIRS.2008.10.27.L3 Topography', XSIZE=600, YSIZE=400
MAP_SET, /GRID, /CONTINENT
CONTOUR, dataset, lon, lat, /OVERPLOT, /FILL, C_COLORS=Indgen(levels)+3, BACKGROUND=1, NLEVELS=levels
MAP_GRID, /LABEL, COLOR=255
MAP_CONTINENTS, COLOR=255