Thanks Micha for his help!Following his advise, I install the qgis,and the grass plugin and create new location(epsg4326),and reproj my vector map to this proj,then export it to kml successfully,however when add the kml to googlearth I found the layer doesnot match the tiff,the annex can give a clear explaination. The reason I export the map to kml and add it to googlearth is to make a thecmatic map by their areas(I have five vector maps),also I found the d.vect.thecmatic is to make this kind of map ,however I did not sure the "column" parameter,I wonder this commond is useful for my goal? 2009/6/21 Micha Silver <[email protected]>
> maven apache wrote: > >> I am using 6.3,my tiff info: >> --------------------------------------- >> Coordinate System is: >> PROJCS["WGS 84 / UTM zone 20S", >> GEOGCS["WGS 84", >> DATUM["WGS_1984", >> SPHEROID["WGS 84",6378137,298.2572235630016, >> AUTHORITY["EPSG","7030"]], >> AUTHORITY["EPSG","6326"]], >> PRIMEM["Greenwich",0], >> UNIT["degree",0.0174532925199433], >> AUTHORITY["EPSG","4326"]], >> PROJECTION["Transverse_Mercator"], >> PARAMETER["latitude_of_origin",0], >> PARAMETER["central_meridian",-63], >> PARAMETER["scale_factor",0.9996], >> PARAMETER["false_easting",500000], >> PARAMETER["false_northing",10000000], >> UNIT["metre",1, >> AUTHORITY["EPSG","9001"]], >> AUTHORITY["EPSG","32720"]] >> -------------------------------------------------------------- >> First I create location :g.proj -c georef=d:/swilAlphaTIFF.tif >> datumtrans=0 location=newlocation >> 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. >> Then I start to covert the projection. >> I creation new epsg4326 location: then "v.proj input=bule >> location=newlocation mapset=PERMANENT dbase=D:\GrassDataBase output=newblue >> But when I display the newblue it is blank,just like the projection is not >> matched...... >> I ...... have no idea. >> >> ============================= >> 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... >> >> 2009/6/19 Hamish <[email protected] <mailto:[email protected]>> >> >> >> Hamish: >> > create a new lat/lon WGS84 location with EPSG code # >> > 4326, then pull in maps from source mapset using r.proj, v.proj. >> >> maven: >> > I have lose my heart so.... So many >> > people have gave me help,.......I can not do it. >> >> >> ok probably that I broke g.proj in 6.4.0rc5 makes it my fault that you >> can't create any new locations :) sorry. >> >> >> >> try this: >> >> start grass from the command line with >> >> grass64 -text >> >> then type a new location name, esc-enter, and create new Lat/Lon >> location. >> follow prompts, when it asks for a datum type "wgs84". >> >> >> >> or try to install another version besides 6.4.0rc5 >> (not 6.5svn or 7svn either). >> >> Maven: > Don't lose heart! It seems you've already made some good progress. > Based on Hamish's suggestion (older version of GRASS) maybe you should try > QGIS with it's GRASS plugin. > On windows it's fairly easy to install the whole package with the OSGeo4W > installer. Follow carefully the instructions here: > http://sites.google.com/site/eospansite/qsig-for-windows > THen start QGIS, and activate the GRASS plugin, and there's a button on the > GRASS toolbar to create a new location. You select the GISDBASE > (D:\GrassDataBase) then use the EPSG ID (4326) to define projection (Be > sure to click the "Find" button) , and you should be up and running in the > new Lat/Lon location. > Now use v.proj (from the QGIS GRASS toolbox) to project your vector from > UTM to the new LatLon location, and then find v.out.ogr (again in the QGIS > GRASS toolbox ) to make the kml file. > BTW, If you prefer, you can close QGIS right after creating the location, > and then open GRASS in this new Lat/Lon location and do these last two steps > from within GRASS. > -- > Micha > > >> >> good luck, >> Hamish >> >> >> >> >> >> >> >> This mail was received via Mail-SeCure System. >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> grass-user mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/grass-user >> >> This mail was received via Mail-SeCure System. >> >> >> >> > >
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