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July 2004
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2004.07.16 13:51 "Re: How to get the image data given that its position rectangle is known", by Frank Warmerdam
yanjianfeng wrote: > In a Tiff file, I want to get the image data in a given rectangle(the > Rectangle's location is known: Begining ordinates in the Tiff file and > width, height of the range),Then I can put all the data into an Array to > process them. > > Is there any relative tools or functions available to solve the problem? Hi, Libtiff does not provide a simple function to accomplish what you want. It can be done, but you will likely have to have a bunch of logic to collect your desired window from all strips or tiles touching the window. Alternatively you can use a higher level library to provide windowed access. I maintain a library aimed at geospatial applications of raster data which can do this (GDAL - http://www.remotesensing.org/gdal) but there are others out there as well. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent