Hi list,
My apologies. The island is actually and obstacle so I still need to include it. However, is there a better way of achieving the external boundary using the centroids or points?? Thanks, Ed 2008/5/29 Edward Tomlinson <[EMAIL PROTECTED]>: > Hi list, > > I have a whole bunch of data from an RTK GPS. File exists as a MapInfo > file. Imports into grass fine with area and centroids. > > My problem is however, i want to create another vector file that contains > the mask or the external (an internal island) boundary. > > I have been able to create the external boundary fine through the > following. > v.category (delete categories) > v.category (add category as 1 for all) > v.dissolve (combine all boundaries with common category) > > This is great and works fine for the external boundary. However there is > meant to be an island in there. Somewhere along the way (i think after the > second call to v.category) it fills that island in. > > Has anyone got any hints or ideas? > > Essentially i am trying to create this vector to generate a mask for > further interpolation of the point heights. I am assuming that i need this > island removed (as there is no point data for it) otherwise it is going to > effect the interpolation. > > Thanks for your time. > Ed >
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