Hi Rob The coordinates are actually reversed, Y is the Easting and the X the Northing. Worse off is the negative sign, not sure what that means. Regards Mwape
> From: [email protected] > To: [email protected] > Subject: RE: [geonet] Converting Local Coordinates to Projected UTM > Coordinates > Date: Tue, 17 Jun 2014 13:54:09 +0000 > > Mwape, > > It is possible that you may be accessing data in a coordinate projection that > was known as the Robertson Projection. This is a unique local projection > that is poorly documented. It was a projection popular with the military in > some African countries during that period and was also used by some mining > companies. It can be very confusing to sort out. > > Can you verify that the Y direction is actually N-S and not E-W? Similarly > that the X direction is actually E-W and not N-S? If I remember correctly, > the Robertson Projection reversed X & Y coordinates in addition to applying a > sign reversal (-ve to the north and east). Units are very probably feet but > you will need to verify as metres were also used. > > Suggest you verify the actual grid coordinate orientation using landmarks or > road intersections that may appear on the maps and on recent satellite > imagery or topographic maps. > > Good luck, it can be a real challenge to convert to UTM if the original data > is in the Robertson Projection. > > Rob Hearst M.Sc., P.Geo, P.Geoph. > Chief Geophysicist > Areva Resources Canada Inc. > Tel:306-343-4049 > Cell: 416-407-6355 > Fax:306-343-4632 > [email protected] > > Before printing this e-mail think if it is necessary > > AREVA group > THIS EMAIL COMMUNICATION IS PRIVATE. IF YOU ARE NOT THE INTENDED RECIPIENT, > PLEASE NOTIFY ME AT THE TELEPHONE NUMBER SHOWN ABOVE OR BY > RETURN EMAIL AND DELETE THIS COMMUNICATION AND ANY COPY IMMEDIATELY. DO NOT > FORWARD IT. THANK YOU. > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of > mwape_somanje > Sent: Tuesday, June 17, 2014 2:35 AM > To: Geosoft Oasis montaj and Target > Subject: [geonet] Converting Local Coordinates to Projected UTM Coordinates > > Dear All > Am working on historical exploration plans for a project in Zambia that was > worked on by some RST company in the 1950 - 1960s. Unfortunately they were > using a local coordinate system that I do not understand for instance the > coordinate Y-10 000, X+25 000. I want to georefference the plans in UTM. Is > there a way to convert them in Target or any other formula? Someone told me > the coordinates are in Loc 29 and in feet. > Thanks > Mwape > --- > > Forum archives can be accessed here: > http://lyris.geosoft.com/read/?fourm=geonet > You are currently subscribed to geonet as: [email protected]. > To subscribe or unsubscribe from any of our forums, select the User Forum > selection on the Geosoft Community page: > http://www.geosoft.com/support/community > > --- > > Forum archives can be accessed here: > http://lyris.geosoft.com/read/?fourm=geonet > You are currently subscribed to geonet as: [email protected]. > To subscribe or unsubscribe from any of our forums, select the User Forum > selection on the Geosoft Community page: > http://www.geosoft.com/support/community --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?fourm=geonet You are currently subscribed to geonet as: [email protected]. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community
