[GRASS-user] The projections and transformations

[Ravinder Singh Bhalla]

Hi Ambrish,
I'd suggest you use Q-GIS for the display of the maps with different 
projections. It happily reads GRASS rasters and vectors. It also has a 
neat plugin to convert from on projection to another.
Note however that Q-GIS is not a replacement for GRASS in terms 
geo-processing.
Cheers
Micha Silver wrote:
> ambrish dhaka wrote:
>> Hello! ALL,
>> I need to learn the important way of working with the data having 
>> different projection system for a single location. Usually the case is 
>> between long lat and UTM projections. I set the region first with 
>> g.region and then try to import vector data which is in long lat 
>> format they do not get "on the fly" transformation in the GRASS and 
>> what I find that they cannot be displayed in my region.
> GRASS does not do "on the fly projection". There are some good 
> explanations on the list why "on the fly" isn't such a good idea. {1}
>>
>> The second question is that is it possible to create two different 
>> mapsets, one in Long lat and other in UTM for the same location and 
>> then work upon these two simultaneously even displaying them.
> No, you don't work that way. You need two separate LOCATIONs, one for 
> UTM and a second for LAT/LON. Then use r.proj or v.proj to pull maps 
> from one to the other. MAPSETs are for sets of maps which are logically 
> related: same work project or in the same place, etc. But everything in 
> one MAPSET must be in the same projection and LOCATION.
> --
> Micha
> 
> [1] 
> http://n2.nabble.com/link-to-datasets-from-other-locations-td3185792.html#a3193823
>>
>>  I hope to get some very good guidance on these issues.
>>
>> thanks!
>>
>> Ambrish Dhaka
>>
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