reg. import of tiff images

[N. Kannan]

Hi,

I created a location and map set for my project work. I have given 
the easting, northing and resolution etc. My land use, soil and 
elevation information are in tiff format (without world file) Can I 
import the tiff files straight away using r.in.tiff  followed by 
r.support. 

If world file is a must where and how can i create a world file? 

One more question

How can change the category value for a single cell or a few cells? 

Suggesstions are requested

Please reply to yourkannan at hotmail.com   or to this e-mail address


Department of Engineering Hydrology,
Powder Store, Nuns Island,
National University of Ireland-Galway,
CO GALWAY,
IRELAND