[求助]加图层时提示"Warning, inconsistent extent"，原因何在？

<P>加图层时提示</P>
<P>"Warning, inconsistent extent！</P>
<P>One or more of the added layers has an extent that is not consistent with the associated spatial reference information.</P>
<P>Reprojecting the data in such a layer may lead to unexpected behavior. Use ArcCatalog to confirm the spatial reference is correct and adjust if necessary"</P>

<P>（备注：数据的Geographic coordinate system name: GCS_Assumed_Geographic_1）</P>
<P>为什么会出现这样的信息提示？这样会对数据有影响吗？</P>
<P>如果有影响将来的使用，请问我该采取什么方式？如何进行adjust?</P>