Dear Corrado Ingravallo, In case of filters, when kernel shifts from a1 cell to a2 cell , your formulae will look like a2/(a2+a3+b2+b3) instead of your desired a2/(a1+a2+b1+b2). So it can not be implemented on filters. This is task of Grid calculation and can be easily implemented on Grid GIS (Spatial Analist of ArcView) or with some complicated tricks on ERMapper, but to explain the last is too hard to me because of my English.
Regards, Georgy Illarionov Moscow state forestry university -----Original Message----- From: Ingravallo Corrado [SMTP:[EMAIL PROTECTED]] Sent: Friday, November 02, 2001 11:20 To: [EMAIL PROTECTED] Subject: Programming on C in ErMapper 6.21 We want to apply to a pancromatic band of Landsat7 a window (2 row x 2 col) with a formula as described below. We think it's possible with a kernel programmed in C, but since we aren't able to do it, is there someone who could help us in this? Regard Corrado Ingravallo Italy << File: ATT00002.html >> << File: formula C.jpg >> ----------------------------------------------------------- To make changes to your subscription, please visit our website, http://www.ermapper.com/technicl/ermapperl/index.htm
