incoprporation of datum

[Jose Luis Garcia Puga]

Hi everyone   I need help to incorporate a series of ortophotos in Ermapper but this has an datum that Ermapper doesn’t has, I would like know how can I include this parameters for transformations.  My ortophotos has ITRF92 Datum and GRS 80 spheroid, unfortunately we don’t have the parameters like meter_factor, survey foot… etc., for integrate to ermappers system,  Can anybody help me? Jose Luis Garcia Puga Centro de Sismolog�a y Volcanolog�a de Occidente Universidad de Guadalajara, Campus Puerto Vallarta  Tel [52] (328) 105 20, 21 Ext. 118 FAX [52] (328) 105 22         Local / GDL/ Tel. 31342280, ext. 118 *[Correo(mailing address)]: Ap Postal 96-B, Puerto Vallarta, Jal 48330                    *Direcci�n (address): Av. Universidad 203, Del. Ixtapa,                                  Puerto Vallarta Jal 48280, MEXICO                                e-mail [EMAIL PROTECTED] [EMAIL PROTECTED]   Home page (www.gratisweb/lepiug)