topic Re: Coordinate System - Imagery Basemap in Data Management Questions https://community.esri.com/t5/data-management-questions/coordinate-system-imagery-basemap/m-p/707529#M40078 <HTML><HEAD></HEAD><BODY><SPAN>If I am understanding you correctly...</SPAN><BR /><SPAN>When you add a data layer to a new blank map document, the data frame will adopt the coordinate system of the first data layer.</SPAN><BR /><SPAN>For the online base maps, this is web Mercator.</SPAN><BR /><SPAN>Then, if you want to be in a different coordinate system, simply right click on the data frame, select the coordinate system tab and select a new coord sys.</SPAN><BR /><BR /><SPAN>All data added to the frame will be reprojected on-the-fly into whatever system the data frame is using.</SPAN><BR /><SPAN>The rider to this is when the input data has "no projection" or has an incorrectly specified system. But that's another debate.</SPAN><BR /><SPAN>Cheers,</SPAN><BR /><SPAN>Neil</SPAN></BODY></HTML> Thu, 17 Oct 2013 08:02:24 GMT NeilAyres 2013-10-17T08:02:24Z Coordinate System - Imagery Basemap https://community.esri.com/t5/data-management-questions/coordinate-system-imagery-basemap/m-p/707528#M40077 <HTML><HEAD></HEAD><BODY><SPAN>Good morning, I am using ArcGIS 10.1, previously used version 9.1. When I add the base map (Imagery) the coordinate system of the data in use is changed.</SPAN><BR /><SPAN>As can keep the coordinate system and that the Base Map (Imagery) will fit?</SPAN><BR /><BR /><SPAN>thanks</SPAN></BODY></HTML> Wed, 16 Oct 2013 13:38:15 GMT https://community.esri.com/t5/data-management-questions/coordinate-system-imagery-basemap/m-p/707528#M40077 HernanMorales 2013-10-16T13:38:15Z Re: Coordinate System - Imagery Basemap https://community.esri.com/t5/data-management-questions/coordinate-system-imagery-basemap/m-p/707529#M40078 <HTML><HEAD></HEAD><BODY><SPAN>If I am understanding you correctly...</SPAN><BR /><SPAN>When you add a data layer to a new blank map document, the data frame will adopt the coordinate system of the first data layer.</SPAN><BR /><SPAN>For the online base maps, this is web Mercator.</SPAN><BR /><SPAN>Then, if you want to be in a different coordinate system, simply right click on the data frame, select the coordinate system tab and select a new coord sys.</SPAN><BR /><BR /><SPAN>All data added to the frame will be reprojected on-the-fly into whatever system the data frame is using.</SPAN><BR /><SPAN>The rider to this is when the input data has "no projection" or has an incorrectly specified system. But that's another debate.</SPAN><BR /><SPAN>Cheers,</SPAN><BR /><SPAN>Neil</SPAN></BODY></HTML> Thu, 17 Oct 2013 08:02:24 GMT https://community.esri.com/t5/data-management-questions/coordinate-system-imagery-basemap/m-p/707529#M40078 NeilAyres 2013-10-17T08:02:24Z