I am tring to zoom this part of the map with data so that labels will fit in, also to enable proper visaulisation. I am using proc gproject but can't really get this working.
Can you provide your code & data?
In general, there's not really a way to "zoom" a map with gmap.
The two alternatives are to subset your map to only contain the polygons/ids you want to see, or use proc gproject's latmin/latmax and longmin/longmax options to trim off the areas you don't want. (Both of these have some 'gotchas' and neither provides a true zoom capability.)
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