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Re: connecting to a server to retrieve data (optimizing) [message #41941 is a reply to message #41806]

Mon, 29 November 2004 15:16

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

nunoragil@yahoo.com (Nuno Gil) writes:
> Craig,
> I'm having some problems writing the image.
> If you try this link it will download a 16-bit signed Integer tiff
> image with 2816 KB:
> http://iceds.ge.ucl.ac.uk/cgi-bin/wcs?REQUEST=GetCoverage&am p;COVERAGE=srtm&SERVICE=WCS&map=wcs.map&BBOX=46, -25,47,-24&FORMAT=GEOTIFFINT16&CRS=EPSG:4326&RES X=0.00083333&RESY=0.00083333
>
> However, if trying to get it via IDL with:
> img=INTARR(1200,1200)
> READU, in, img
> WRITEU,out,img
> I can only get a 2813 KB file and cannot open it properly.
> 1200x1200 are the number of pixels of the image.
> By the way, if I declare the array bigger than this (lets say
> 2001x2001) the READU issues an "End of file encountered" error.

What if you read the image in smaller chunks instead of reading it all
at once?

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		connecting to a server to retrieve data (optimizing) By: nunoragil on Sat, 27 November 2004 20:57
		Re: connecting to a server to retrieve data (optimizing) By: Craig Markwardt on Mon, 29 November 2004 15:16
		Re: connecting to a server to retrieve data (optimizing) By: nunoragil on Mon, 29 November 2004 04:45

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