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[IDV #LZC-719196]: Unable to display tiff image

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  • Subject: [IDV #LZC-719196]: Unable to display tiff image
  • Date: Tue, 12 May 2009 03:30:35 -0600
Hi Simon,

> Hardware: Java: home: C:\Program Files\IDV_2.6u2\jre version: 1.6.0_11 
> j3d:1.5.2 fcs (build4)
> Description of problem: I've been unable to get IDV to display a geoTIFF 
> image.  It opens in to the dashboard but when attempting to display the image 
> it gives me a java heap space issue which appears to be a memory related 
> issue despite the image being only 30.6 Mb in size.  Is this a known issue or 
> is there anything I can do?  Out of curiosity I'm wondering what the memory 
> sizes on the bottom of 533Mb refer to as I have 3 Gb installed on my machine.
> 

First of all we really don't have good support for geotiffs. We can read them 
in and show them in the OmniControl which is sort of a low level catch all 
display. We do not read the geolocation information in the geotiff so cannot 
display the images in the main map display.

As to the memory issue - The 30MB image could end up requiring substantial 
memory both for the internal data structures we create in the IDV and when the 
image is displayed there is a problem where we need to expand its size to the 
next power of 2 (I know, don't ask :-)).

The numbers at the bottom show the current memory usage, the high water mark 
and the maximum size available to Java.  You can change this amount:
http://www.unidata.ucar.edu/software/idv/docs/userguide/misc/PerformanceTuning.html#heap
But, (at least on windows) about the most you can do as 1.2 Gigabytes.

-Jeff


Ticket Details
===================
Ticket ID: LZC-719196
Department: Support IDV
Priority: Normal
Status: Closed