<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Regina,<div><br></div><div>To use the approach below you need to 'Stop Editing' so that the union edits are written to the shapefile.</div><div><br></div><div>However, I think an easier approach is to not use the GUI Editing interface and rather the 'Dissolve' tool in the (<span class="Apple-style-span" style="font-family: Verdana; font-size: 10px; line-height: 16px; ">Geoprocessing tool reference > Data Management toolbox > Generalization toolset > Tools), which will take and input datasource and output a new one through the 'ArcToolbox' dialog.</span></div><div><font class="Apple-style-span" face="Verdana" size="2"><span class="Apple-style-span" style="font-size: 10px; line-height: 16px;"><br></span></font></div><div><font class="Apple-style-span" face="Verdana" size="2"><span class="Apple-style-span" style="font-size: 10px; line-height: 16px;">Here is the direct link to the tool help (should help you find it in the Toolbox view):</span></font></div><div><br></div><div><a href="http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=Dissolve_(Data_Management)">http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=Dissolve_(Data_Management)</a></div><div><br></div><div>A Happy-PosGIS-User-Once-A-Confused-Clicky-ArcGIS-User,</div><div>Dane</div><div><br></div><div><br></div><div><br></div><div><div><div>On Aug 18, 2008, at 9:02 AM, Obe, Regina wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"> <div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2">Thanks Mike,</font></span></div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2"></font></span> </div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2"> Yap that looks more like a union and was pretty fast, but then couldn't figure out how to export it.</font></span></div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2">I right clicked on the layer - selected export data to shape.</font></span></div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2"></font></span> </div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2">Very strangely when I reopen the new shape file in ArcMap - it looks unioned, but then when I open the same shape file in OpenJump - I can still see the boundaries still and opening up the dbf there are clearly 274 records. I even deleted the mxd, sbn, sbx files ArcMap created and it still looked unioned when I reopened it in ArcMap and not unioned when I look at it in open jump.</font></span></div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2"></font></span> </div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2">The union created in open jump is half the size of the ArcMap one too and dbf is empty as I would expect since I didn't ask for any roll up of attributes.</font></span></div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2"></font></span> </div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2">I'm very puzzled. I have no idea why ArcMap shows this as unioned when the size of the shape and the stats don't look that much different from the original. I'm sure I must be missing something here.</font></span></div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2"></font></span> </div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2">Stats looks like this is in open jump</font></span></div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2"></font></span> </div><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2"> <h2 dir="ltr" align="left"><font size="3">Layer: OpenJumpUnion</font> </h2> <div dir="ltr" align="left"><b>Envelope: </b>Env[-179.14734 : 179.77850341796875, 17.884813 : 71.35256064399981]<br><b># Features: </b>1<br></div> <div dir="ltr" align="left"> <table border="1"> <tbody> <tr> <td bgcolor="#cccccc"> </td> <td align="middle" bgcolor="#cccccc">Min </td> <td align="middle" bgcolor="#cccccc">Max </td> <td align="middle" bgcolor="#cccccc">Avg </td> <td align="middle" bgcolor="#cccccc">Total </td></tr> <tr> <td bgcolor="#cccccc">Pts </td> <td align="right">69795 </td> <td align="right">69795 </td> <td align="right">69795.0 </td> <td align="right">69795 </td></tr> <tr> <td bgcolor="#cccccc">Holes </td> <td align="right">0 </td> <td align="right">0 </td> <td align="right">0.0 </td> <td align="right">0 </td></tr> <tr> <td bgcolor="#cccccc">Components </td> <td align="right">219 </td> <td align="right">219 </td> <td align="right">219.0 </td> <td align="right">219 </td></tr> <tr> <td bgcolor="#cccccc">Area </td> <td align="right">1104.3917345465716 </td> <td align="right">1104.3917345465716 </td> <td align="right">1104.3917345465716 </td> <td align="right">1104.3917345465716 </td></tr> <tr> <td bgcolor="#cccccc">Length </td> <td align="right">733.4595414659133 </td> <td align="right">733.4595414659133 </td> <td align="right">733.4595414659133 </td> <td align="right">733.4595414659133 </td></tr></tbody></table></div> <div dir="ltr" align="left"> </div></font> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff"><strong>ArcMap Union</strong></font></span></div></span> <div dir="ltr" align="left"><span class="334073315-18082008"><strong>Envelope: </strong>Env[-179.14734 : 179.77850341796875, 17.884813 : 71.35256064399981]<br><b># Features: </b>274 </span></div> <div dir="ltr" align="left"><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2"> <table border="1"> <tbody> <tr> <td bgcolor="#cccccc"><font color="#0000ff" size="2"></font></td> <td align="middle" bgcolor="#cccccc">Min </td> <td align="middle" bgcolor="#cccccc">Max </td> <td align="middle" bgcolor="#cccccc">Avg </td> <td align="middle" bgcolor="#cccccc">Total </td></tr> <tr> <td bgcolor="#cccccc">Pts </td> <td align="right">5 </td> <td align="right">45836 </td> <td align="right">688.0 </td> <td align="right">188644 </td></tr> <tr> <td bgcolor="#cccccc">Holes </td> <td align="right">0 </td> <td align="right">0 </td> <td align="right">0.0 </td> <td align="right">0 </td></tr> <tr> <td bgcolor="#cccccc">Components </td> <td align="right">1 </td> <td align="right">219 </td> <td align="right">1.0 </td> <td align="right">492 </td></tr> <tr> <td bgcolor="#cccccc">Area </td> <td align="right">1.0783706500011592E-5 </td> <td align="right">1104.373302353546 </td> <td align="right">8.061118897843844 </td> <td align="right">2208.7465780092134 </td></tr> <tr> <td bgcolor="#cccccc">Length </td> <td align="right">0.013284095041776186 </td> <td align="right">733.3902842391406 </td> <td align="right">8.213194606088345 </td> <td align="right">2250.4153220682065 </td></tr></tbody></table></font></span></div> <div><font face="Arial" color="#0000ff" size="2"></font> </div> <div><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2"></font></span> </div> <div><span class="334073315-18082008"></span><font face="Arial"><font color="#0000ff"><font size="2">O<span class="334073315-18082008">riginal</span></font></font></font></div><font face="Arial"><font color="#0000ff"><font size="2"><span class="334073315-18082008"> <h2>Layer: st99_d00 </h2> <div><b>Envelope: </b>Env[-179.14734 : 179.77850341796875, 17.884813 : 71.35256064399981]<br><b># Features: </b>274<br></div> <div> <table border="1"> <tbody> <tr> <td bgcolor="#cccccc"> </td> <td align="middle" bgcolor="#cccccc">Min </td> <td align="middle" bgcolor="#cccccc">Max </td> <td align="middle" bgcolor="#cccccc">Avg </td> <td align="middle" bgcolor="#cccccc">Total </td></tr> <tr> <td bgcolor="#cccccc">Pts </td> <td align="right">5 </td> <td align="right">45836 </td> <td align="right">688.0 </td> <td align="right">188644 </td></tr> <tr> <td bgcolor="#cccccc">Holes </td> <td align="right">0 </td> <td align="right">0 </td> <td align="right">0.0 </td> <td align="right">0 </td></tr> <tr> <td bgcolor="#cccccc">Components </td> <td align="right">1 </td> <td align="right">219 </td> <td align="right">1.0 </td> <td align="right">492 </td></tr> <tr> <td bgcolor="#cccccc">Area </td> <td align="right">1.0783706500011592E-5 </td> <td align="right">1104.373302353546 </td> <td align="right">8.061118897843844 </td> <td align="right">2208.7465780092134 </td></tr> <tr> <td bgcolor="#cccccc">Length </td> <td align="right">0.013284095041776186 </td> <td align="right">733.3902842391406 </td> <td align="right">8.213194606088345 </td> <td align="right">2250.4153220682065 </td></tr></tbody></table></div></span></font></font></font> <div><br><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2">Signed,</font></span></div> <div><span class="334073315-18082008"><font face="Arial" color="#0000ff" size="2">Very confused Regina</font></span></div> <div class="OutlookMessageHeader" lang="en-us" dir="ltr" align="left"> <hr tabindex="-1"> <font face="Tahoma" size="2"><b>From:</b> postgis-users-bounces@postgis.refractions.net [<a href="mailto:postgis-users-bounces@postgis.refractions.net">mailto:postgis-users-bounces@postgis.refractions.net</a>] <b>On Behalf Of </b>Bresnahan, Mike<br><b>Sent:</b> Monday, August 18, 2008 10:12 AM<br><b>To:</b> PostGIS Users Discussion<br><b>Subject:</b> RE: [postgis-users] PostGIS 1.3.3 on Windows XP Unstable<br></font><br></div> <div></div> <div id="idOWAReplyText46739" dir="ltr"> <div dir="ltr"><font size="2">> How the hell do you get it to do a real union?<br><br>Heh. Intuitive ArcMap is not. It took me forever to figure it out as well. You can do a union a couple different ways. The way that seemed to work the best for this is to:</font></div> <div dir="ltr"><font size="2"></font> </div> <div dir="ltr"><font size="2">1) Run ArcMap</font></div> <div dir="ltr"><font size="2">2) Add the shapefile to your map</font></div> <div dir="ltr"><font size="2">3) Open the edit toolbar.</font></div> <div dir="ltr"><font size="2">4) Click on Start Editing.</font></div> <div dir="ltr"><font size="2">5) Select the entire dataset by left clicking and then dragging a rectangle around the geometry.</font></div> <div dir="ltr"><font size="2">6) Select Union from the menu on the edit toolbar.</font></div> <div dir="ltr"><font size="2"></font> </div> <div dir="ltr"><font size="2">You should see the union happen right before your eyes.</font></div> <div dir="ltr"><font size="2"></font> </div> <div dir="ltr"><font size="2">I think I tried the Union Tool like you did and didn't get what I expected. I think it just did a union on each individual feature instead of doing an aggregate union.</font></div> <div dir="ltr"><font size="2"></font> </div></div></div> <div><div><br class="webkit-block-placeholder"></div><hr size="1"><div><br class="webkit-block-placeholder"></div><p><strong> The substance of this message, including any attachments, may be confidential, legally privileged and/or exempt from disclosure pursuant to Massachusetts law. It is intended solely for the addressee. If you received this in error, please contact the sender and delete the material from any computer. </strong></p></div><div><br class="webkit-block-placeholder"></div><hr size="1"><div><br class="webkit-block-placeholder"></div><p><strong><font size="2" color="339900"> Help make the earth a greener place. 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