topic Re: Is it possible to georeference a jpeg map without control points? in Map Projections Questions https://community.esri.com/t5/map-projections-questions/is-it-possible-to-georeference-a-jpeg-map-without/m-p/871045#M281 <HTML><HEAD></HEAD><BODY><P>The difference in the projections and you are going to reference it to requires control points.</P><P>You can adjust to fit as best you can, but you will need to provide that real-world referencing in order to get a useful product.</P></BODY></HTML> Thu, 19 Apr 2018 05:03:06 GMT DanPatterson_Retired 2018-04-19T05:03:06Z Is it possible to georeference a jpeg map without control points? https://community.esri.com/t5/map-projections-questions/is-it-possible-to-georeference-a-jpeg-map-without/m-p/871044#M280 <HTML><HEAD></HEAD><BODY><P>&nbsp;Can i just overlay it on a base map and make the fit as close as possible? (the scanned map I have has decimal degrees but its really old and doesnt seem to align to&nbsp;WGS 89 which is the coordinate system I want.&nbsp;</P><P><IMG class="image-1 jive-image" src="https://community.esri.com/legacyfs/online/402343_pastedImage_1.jpg" style="width: 620px; height: 589px;" /></P></BODY></HTML> Thu, 19 Apr 2018 00:08:51 GMT https://community.esri.com/t5/map-projections-questions/is-it-possible-to-georeference-a-jpeg-map-without/m-p/871044#M280 Olivia_Leadbetter 2018-04-19T00:08:51Z Re: Is it possible to georeference a jpeg map without control points? https://community.esri.com/t5/map-projections-questions/is-it-possible-to-georeference-a-jpeg-map-without/m-p/871045#M281 <HTML><HEAD></HEAD><BODY><P>The difference in the projections and you are going to reference it to requires control points.</P><P>You can adjust to fit as best you can, but you will need to provide that real-world referencing in order to get a useful product.</P></BODY></HTML> Thu, 19 Apr 2018 05:03:06 GMT https://community.esri.com/t5/map-projections-questions/is-it-possible-to-georeference-a-jpeg-map-without/m-p/871045#M281 DanPatterson_Retired 2018-04-19T05:03:06Z Re: Is it possible to georeference a jpeg map without control points? https://community.esri.com/t5/map-projections-questions/is-it-possible-to-georeference-a-jpeg-map-without/m-p/871046#M282 <HTML><HEAD></HEAD><BODY><P>It looks like there are graticule lines identifying latitude-longitude so you could use those. If they aren't labeled with latitude-longitude lines, are there any coordinates on them at all? Is there any projection, datum, or ellipsoid information anywhere?&nbsp;</P><P></P><P>Who's the publisher and when was it published? That can also help narrow down what coordinate system was used.</P><P></P><P>Melita</P></BODY></HTML> Fri, 20 Apr 2018 16:50:54 GMT https://community.esri.com/t5/map-projections-questions/is-it-possible-to-georeference-a-jpeg-map-without/m-p/871046#M282 MelitaKennedy 2018-04-20T16:50:54Z