<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr">I encountered following problems with Intersection by using Grass's v.overlay.</div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr">I used 2 vector area maps to create a new map through intersection (or option used).</div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr">The number of new polygonal areas of the output each time is different. Inconsistent output.</div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr">I kept encountering Error 6: Failed to add field named 'a_testnumber'.<br></div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr">Can anyone shed some light on this?</div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr">Regards,</div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1516876905960_6183" dir="ltr">David</div></div></body></html>