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<div class="moz-cite-prefix">You can certainly transform vector and
raster data from one Coordinate Reference System to another. As
you have probably already realized GRASS is more insistant than
some other GIS software regarding CRS. When you first startup a
GRASS session you must choose your LOCATION and MAPSET. The
LOCATION is defined by a particular CRS, and all the layers in all
the MAPSETs under that LOCATION must be in that particular CRS. <br>
To load data into GRASS which is projected into some other CRS,
you create a new LOCATION based on that other CRS, and load the
new data there. Now switch over to the target LOCATION/MAPSET and
run the command v.proj (In the GUI menu it's Vector->Develop
vector map->Reproject Vector map. You set the source LOCATION
and MAPSET and the original vector name. Then a new, re-projected
vector is created in the target LOCATION/MAPSET.<br>
<br>
HTH<br>
<br>
<br>
On 23/08/2012 18:52, Charles E. Deaton wrote:<br>
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<p class="MsoNormal">I’ve been looking at GRASS for a few months
now and for the most can’t determine if I can transform
coordinate systems of vector data or not. I’m stuck. All of
the data I use (shapefiles) have been in the same reference
system (I think it’s the reference system I’m talking about).
I’ve been trying to merge two file that are not in the same
reference system with no luck. Here are links to them.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any of these (Q3 FIRM Layer):<o:p></o:p></p>
<p class="MsoNormal"><a moz-do-not-send="true"
href="http://www.mcgi.state.mi.us/mgdl/?rel=thext&action=thmname&cid=6&cat=Flood+Insurance+Rate+Maps+%28Q3+FIRMs%29">http://www.mcgi.state.mi.us/mgdl/?rel=thext&action=thmname&cid=6&cat=Flood+Insurance+Rate+Maps+%28Q3+FIRMs%29</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Into this <b>(</b><span class="title1"><span
style="font-family:"Calibri","sans-serif";color:windowtext;font-weight:normal">National
Flood Hazard Layer (NFHL) Database)</span></span>:<o:p></o:p></p>
<p class="MsoNormal"><a moz-do-not-send="true"
href="https://msc.fema.gov/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=10001&storeId=10001&categoryId=12011&langId=-1&userType=G&type=12">https://msc.fema.gov/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=10001&storeId=10001&categoryId=12011&langId=-1&userType=G&type=12</a><o:p></o:p></p>
<p class="MsoNormal">Then select Michigan.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">One appears to be in decimal and the other
in lat/lon. One has projection file and the other doesn’t<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If anyone can shed any light on the process
to do this with GRASS or any other Open Source applications it
would really be appreciated.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Times New
Roman","serif";color:black">Regards,<br>
Charles Deaton<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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