<br><br><div class="gmail_quote">2009/6/22 Micha Silver <span dir="ltr"><<a href="mailto:micha@arava.co.il">micha@arava.co.il</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
maven apache wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
Thanks Micha for his help!<br>
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.<br>
</div>
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?\<br>
</blockquote>
Yes it is. Reading the manual you will see:<br>
<br>
column=string<br>
Name of attribute column to use for thematic display (must be numeric)<br>
<br>
So the column you set will be used to separate the different areas by color. (Note the "must be numeric" part).<br>
But I don't understand the "five vector maps". </blockquote><div>I did have five vector layer each of which have only one categories,Actually I got the five vector from the commond "v.extract......"; </div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> Normally you would use d.vect.thematic if you have 5 categories in *one* vector map. Then setting i.e. column=cat would color each different cat value a different color.</blockquote>
<div>Where is the generated thematic map,in the display? </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> If the areas are already in separate vectors, then can't you just color each vector differently in the google earth display?<br>
<br>
<br>
<br>
</blockquote></div><br>