<span class="Apple-style-span" style="border-collapse: collapse; font-family: Arial; white-space: pre; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><div><br></div></span><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;"><div class="im">
maven apache wrote:<br>
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<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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I did have five vector layer each of which have only one categories,Actually I got the five vector from the commond "v.extract......"; <br>
Normally you would use d.vect.thematic if you have 5 categories<br>
in *one* vector map. Then setting i.e. column=cat would color each<br>
different cat value a different color.<br>
<br>
Where is the generated thematic map,in the display?<br>
</blockquote></div>
Maybe this will help:<br>
I have a vector layer "fields". I ran these two commands (after setting the region):<br>
<br>
# Display fields with different colors based on area<br>
d.vect.thematic map=fields column=HECTARES color=red-blue</blockquote><div><br></div><span class="Apple-style-span" style="font-family: Arial; border-collapse: collapse; white-space: pre; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><div>
<span class="Apple-style-span" style="border-collapse: separate; font-family: arial; white-space: normal; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: collapse; font-family: Arial; white-space: pre; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">"You must open a display monitor"</span><br>
</span></div></span><div><span class="Apple-style-span" style="font-family: Arial; border-collapse: collapse; white-space: pre; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">I meet this error message when do the commond "d.vect.thecmatic....", by the serach enginee I found this topic has mentioned in the grass-dev mailist,but I have not found the final way to solve the problem/</span></div>
<div><span class="Apple-style-span" style="font-family: Arial; border-collapse: collapse; white-space: pre; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "></span> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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# Add a label with the area for each field<br>
d.vect map=fields display=attr type=centroid attrcol=HECTARES lsize=10 lcolor=black<br>
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And the result is the attached image. The d.vect.thematic broke the fields into 4 categories based on size (two larger fields have the same color). I could have changed the number of intervals with the nint option.<br>
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Cheers,<br><font color="#888888">
Micha<br>
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</font></blockquote></div><br>