Dugald, did you saved the file as a new ers after the formula application? if in your formula you used something like "IF NOT INREGION(R1) THEN NULL ELSE I1", you have to generate a new data set and save the results before compressing. Remeber to use "0" as the null value field when saving.
I hope this helps. Mauricio ---------Included Message---------- >Date: Thu, 28 Feb 2002 12:14:02 -0800 >From: "Dugald Dunlop" <[EMAIL PROTECTED]> >Reply-To: <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Subject: Null Cells in ECW Files > >Hello All: > >I have a set of cartographic images which I would like to compress. The >map tiles are bounded by Lat-Long lines and the ERS file is in UTM >projection. I have therefore added the neat line as a raster region and >added a formula to make everything outside the neatline polygon null. This >works just fine when I view it in the algorithm, however the null cells >outside the neat line are not carried through when I compress the algorithm >to an ECW file. Any suggestions how I can carry the null cells through to >the ECW file? > >Thanks > >Mauricio Baquero Department of Geology Bowling Green State University 311 N. Grove St, Bowling Green, OH 43402 (419)353-7073 [EMAIL PROTECTED] > >----------------------------------------------------------- > >To make changes to your subscription, please visit our website, >http://www.ermapper.com/technicl/ermapperl/index.htm > > ---------End of Included Message---------- ----------------------------------------------------------- To make changes to your subscription, please visit our website, http://www.ermapper.com/technicl/ermapperl/index.htm
