The control points are used to calculate the exterior orientation parameters, and the minimum nr required is 3. Max is undefined. It is important to have a good spread of points across the image. I think 25+ is a good number to be using.
cheers Mike > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] > Sent: Tuesday, 11 December 2001 9:24 PM > To: [EMAIL PROTECTED] > Subject: Orthorectification > > > When Ortho Rectifying a mosaic with 24K DRG's and 24K DEM's is there a > min & max number of points that should be used? > > We have always done the polynominal Mosaic and have used a min of 25 > points > > > Garry Natale > American Aerial Photo > Dallas TX > [EMAIL PROTECTED] > > ----------------------------------------------------------- > > To make changes to your subscription, please visit our > website, http://www.ermapper.com/technicl/ermapperl/index.htm > > ----------------------------------------------------------- To make changes to your subscription, please visit our website, http://www.ermapper.com/technicl/ermapperl/index.htm
