Deviation between Mercartors Projection and Land survey
Deviation between Mercartors Projection and Land survey
(OP)
Hello there folks !!
I am new to this forum, and am excited to be part of this forum. Recently I was given an assignment to overlap a Google earth satellite image and a cluster of stitched topo survey layout over an area of 4 Kmsq. I noticed that what I am asked to do is not correct because I believe Google earth is based to be created on Mercator's or equivalent cylindrical projection technique wherein in the topo drawing isn't. I am keen to understand the least deviation that would occur in a projected earth image over an unprojected drawing over the said area.. Or I am i wrong here in my assessment ?
Thanks in advance.
I am new to this forum, and am excited to be part of this forum. Recently I was given an assignment to overlap a Google earth satellite image and a cluster of stitched topo survey layout over an area of 4 Kmsq. I noticed that what I am asked to do is not correct because I believe Google earth is based to be created on Mercator's or equivalent cylindrical projection technique wherein in the topo drawing isn't. I am keen to understand the least deviation that would occur in a projected earth image over an unprojected drawing over the said area.. Or I am i wrong here in my assessment ?
Thanks in advance.
Engineering begins where Architecture ends !





RE: Deviation between Mercartors Projection and Land survey
TTFN (ta ta for now)
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RE: Deviation between Mercartors Projection and Land survey
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Deviation between Mercartors Projection and Land survey
I agree with your points, but would it be safe to say that overlapping topo survey and google earth image is the right idea ?
Engineering begins where Architecture ends !
RE: Deviation between Mercartors Projection and Land survey
What kind of errors are you seeing?
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Deviation between Mercartors Projection and Land survey
Engineering begins where Architecture ends !
RE: Deviation between Mercartors Projection and Land survey
Dik
RE: Deviation between Mercartors Projection and Land survey
Is it possible that your surveyor is using a datum that's specific to your region of India? While "absolute" GPS coordinates are used for Google Earth, there may be legacy reasons, such as existing monuments that might tie your survey to a slightly different coordinate system
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Deviation between Mercartors Projection and Land survey
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Deviation between Mercartors Projection and Land survey
Engineering begins where Architecture ends !
RE: Deviation between Mercartors Projection and Land survey
However, if you use a GIS application (ArcGIS, Autocad Map 3D, etc.), and each data source is properly georeferenced, the software should correctly adjust the reference data projections to whatever master projection you have specified (and things should line up).
RE: Deviation between Mercartors Projection and Land survey
Engineering begins where Architecture ends !