I am using 6.3,my tiff info:<div>---------------------------------------</div><div><div>Coordinate System is:</div><div>PROJCS["WGS 84 / UTM zone 20S",</div><div> GEOGCS["WGS 84",</div><div> DATUM["WGS_1984",</div>
<div> SPHEROID["WGS 84",6378137,298.2572235630016,</div><div> AUTHORITY["EPSG","7030"]],</div><div> AUTHORITY["EPSG","6326"]],</div><div>
PRIMEM["Greenwich",0],</div><div> UNIT["degree",0.0174532925199433],</div><div> AUTHORITY["EPSG","4326"]],</div><div> PROJECTION["Transverse_Mercator"],</div>
<div> PARAMETER["latitude_of_origin",0],</div><div> PARAMETER["central_meridian",-63],</div><div> PARAMETER["scale_factor",0.9996],</div><div> PARAMETER["false_easting",500000],</div>
<div> PARAMETER["false_northing",10000000],</div><div> UNIT["metre",1,</div><div> AUTHORITY["EPSG","9001"]],</div><div> AUTHORITY["EPSG","32720"]]</div>
<div>--------------------------------------------------------------</div><div>First I create location :g.proj -c georef=<span style="color:blue">d:/swilAlphaTIFF.tif</span>
datumtrans=0 location=newlocation</div><div>then import it to the new location: get four raster maps(it has three band),I composite them and then transfer the composted raster to vector,then extract each category to a vector,one of them is named bule.</div>
<div>Then I start to covert the projection.</div><div>I creation new epsg4326 location: then "v.proj input=bule location=newlocation mapset=PERMANENT dbase=D:\GrassDataBase output=newblue</div><div>But when I display the newblue it is blank,just like the projection is not matched......</div>
<div>I ...... have no idea.</div><div><br></div><div>=============================</div><div>Actually I have exported the vector data to shapefile ,then use arcgis to transfer the shapefile to kml,but I think the accurcy is low...</div>
<br><div class="gmail_quote">2009/6/19 Hamish <span dir="ltr"><<a href="mailto:hamish_b@yahoo.com">hamish_b@yahoo.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<br>
Hamish:<br>
<div class="im">> create a new lat/lon WGS84 location with EPSG code #<br>
> 4326, then pull in maps from source mapset using r.proj, v.proj.<br>
<br>
</div>maven:<br>
<div class="im">> I have lose my heart so.... So many<br>
> people have gave me help,.......I can not do it.<br>
<br>
<br>
</div>ok probably that I broke g.proj in 6.4.0rc5 makes it my fault that you<br>
can't create any new locations :) sorry.<br>
<br>
<br>
<br>
try this:<br>
<br>
start grass from the command line with<br>
<br>
grass64 -text<br>
<br>
then type a new location name, esc-enter, and create new Lat/Lon location.<br>
follow prompts, when it asks for a datum type "wgs84".<br>
<br>
<br>
<br>
or try to install another version besides 6.4.0rc5<br>
(not 6.5svn or 7svn either).<br>
<br>
<br>
<br>
good luck,<br>
<font color="#888888">Hamish<br>
<br>
<br>
<br>
<br>
<br>
</font></blockquote></div><br></div>