对一图层进行“Graduated color”操作，显示出错

<P>一矢量图层，图层中约有18000个图斑块，该图层表征不同空间上的风速，我将风速指分为了五个等级，1-5，现想将不同等级风速用不同颜色显示出来<BR><BR>结果，在对图层进行“Graduated color”操作，显示“Maximum sample size reached.....” 该图层共有图斑18000左右，ARCGIS就已经不支持了？</P>
<P>有何办法没？</P>

没人遇到这种情况么？

<P>解决方法如下：</P>
<H4>Error Message</H4>
<DIV>Symbolizing using graduated colors or graduated symbols in ArcMap returns the following error: <BR><BR>"Maximum sample size reached. Not all records are being used. Use this sample or change maximum sample size."</DIV>
<P><BR> </P>
<H4>Cause</H4>
<DIV>The sample size for the data exceeds the maximum sample size specified in the Symbology tab.</DIV>
<P><BR> </P>
<H4>Solution or Workaround</H4>
<DIV>
<OL>
<LI>Right-click the layer in the table of contents and click Properties.
<LI>Click the Symbology tab and click Quantities in the Show box.
<LI>Symbolize the data with graduated colors or graduated symbols.
<LI>Click the Classify button to display the Classification dialog box.
<LI>Click the Sampling button.
<LI>Set the maximum sample size to any number greater than or equal to the amount of features in the layer.
<LI>Click Apply.
<LI>Click OK. </LI></OL></DIV>