<br><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;">
<div class="im"><br>
maven wrote:<br>
> First I create location :g.proj -c georef=d:/swilAlphaTIFF.tif<br>
</div>> datumtrans=0 location=newlocationthen import it<br>
<div class="im">> to the new location: get four raster maps(it has three<br>
> band),I composite them and then transfer the composted<br>
> raster to vector,then extract each category to a vector,one<br>
> of them is named bule.<br>
> Then I start to covert the projection.I<br>
> creation new epsg4326 location: then "v.proj input=bule<br>
> location=newlocation<br>
> mapset=PERMANENT dbase=D:\GrassDataBase output=newblueBut<br>
> when I display the newblue it is blank,just like the<br>
> projection is not matched......<br>
<br>
<br>
</div>what does '<a href="http://v.info" target="_blank">v.info</a> newblueBut' say from within the WGS84 lat/lon location?</blockquote><div> The name is blue:</div><div>-----------------</div><div><div> | Layer: blue </div>
<div> | Mapset: PERMANENT </div><div> | Location: 4326loca </div><div> | Database: D:/GrassDataBase </div>
<div> | Title: </div><div> | Map scale: 1:1 </div><div> | Map format: native </div>
<div> | Name of creator: Administrator </div><div> | Organization: </div><div> | Source date: Thu Jun 18 20:51:48 2009 </div>
<div> |----------------------------------------------------------------------------</div><div> | Type of Map: vector (level: 2) </div><div> | </div>
<div> | Number of points: 0 Number of areas: 4893 </div><div> | Number of lines: 0 Number of islands: 4272 </div><div> | Number of boundaries: 17088 Number of faces: 0 </div>
<div> | Number of centroids: 417 Number of kernels: 0 </div><div> | </div><div> | Map is 3D: 0 </div>
<div> | Number of dblinks: 1 </div><div> | </div><div> | Projection: Universe Transverse Mercator (zone 20) </div>
<div> | N: 2765100.00000638 S: 2668200.00000033 </div><div> | E: 645899.99999942 W: 587100 </div><div> | </div>
<div> | Digitization threshold: 0 </div><div> | Comments: </div><div> | </div>
<div> +----------------------------------------------------------------------------+</div><div>It seems that the cooridate is also UTM...........</div><div><br></div></div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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what does 'g.region -p' say from the lat/lon location?</blockquote><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><br>
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what does 'g.region -l' say from the UTM location?</blockquote><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><br>
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maybe you just need to do "g.region vect=newblueBut" to reset the zoom<br>
to match the data extent?</blockquote><div>That is true ,by do this ,I can see the map. </div><div><br></div><div>The error kml got from the grass surround the hole earth when I add it to google earth ,and the real loation of the tiff is Antarctica.</div>
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