Dear Mr. Osameh Alkaaby, To answer your questions properly, we need to know more about = the desired properties (accuracy, resolution, size etc.) of the final product, = the available memory and disk space on the computer system(s) you use, = the height variations of the terrain, = the availability of DTM's or the possibility to create a DTM = the principal distance of the aerial camera used, = the availability of fiducial marks and camera calibration.
With the information supplied so far anything between a) scanning with 300 dpi and uncontrolled mosaicing with projective (2D) transformation in Ilwis b) scanning with 2500 dpi, Aerotriangulation, DTM-generation, orthophoto production and mosaicing could be most adequate. regards Karl Grabmaier, Jan Hendrikse -----Original Message----- From: Osameh Alkaaby [mailto:[EMAIL PROTECTED]] Sent: Tuesday, April 16, 2002 14:49 To: Ilwis list Subject: (ilwis-list) mosaic Dear :/ I have almost 50 areal photo sacale: 1/55000 with grayscale.now I want to scan them and finally produce a layer. I have several quastion: 1) what is the best (DPI) during scaning. 2) what is the best format( image)during scaning. 3)who can I merge them together and geo-refrencing. 4) who can I control the size(scale) of image when using these images in GIS software like ilwis. I also have Er-mapper 6. arcview 3.2 any help will be appreciated. * * * * * * * * * * * * * * * * * * * * * * * * Isfahan Science and Technology Town * * Desert Ecosystems Research Institute * * Ishfahan- Iran. * * Tel:0098-311-2658311-14 * * Fax:0098-311-2658310 * * [EMAIL PROTECTED] WWW.istt.org * * * * * * * * * * * * * * * * * * * * * * * * ________________________________________________________ To leave the ILWIS-LIST discussion list, send a email with 'unsubscribe ilwis-list' in the body to '[EMAIL PROTECTED]'
