Geo-Referencing

[Teeds]

I need some guidance from surveyors.

 

How do you geo-reference a property boundary, so it shows up in the correct position on earth?

 

I am using AutoCAD to draft property boundaries and need to convert them to shape files and import them into ArcGIS.

 

The importing part etc. is easy enough, but getting them land on the right spot on earth in ArcGIS is a mystery to me. Getting them to be in the correct spot in AutoCAD to begin with is the key.

 

Thanks in advance!

[chulse]

Do you know the real-world coordinates (in a given projection and datum) of at least 1 of the property corners?

 

(I'm not a surveyor, but a GIS geek)

[Teeds]

Do you know the real-world coordinates (in a given projection and datum) of at least 1 of the property corners?

 

(I'm not a surveyor, but a GIS geek)

 

In this particular case I do, but as many times as not this is not the case.

 

I do know that I am all but sunk without one point referenced.

 

I assume that I do something like moving the PLINE to that point in the XY coordinate system and rotate the boundary to match north correctly.

 

What does not make sense is how it works in that the earth is a sphere and the XYZ system is square. I am probably making things way too complicated.

[chulse]

The coordinate system used is likely a State Plane and the x and y grid only covers a small area (not the whole earth).

 

I would think that using Move and Rotate should get you what you want.

Without a known point, I think you are stuck.

 

You might look at this:

http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=An_overview_of_map_projections

or this:

http://geology.isu.edu/geostac/Field_Exercise/topomaps/state_plane.htm

or this:

http://geospatial.osu.edu/conference/proceedings/workshops/conner.pdf

[Teeds]

The coordinate system used is likely a State Plane and the x and y grid only covers a small area (not the whole earth).

 

I would think that using Move and Rotate should get you what you want.

Without a known point, I think you are stuck.

 

You might look at this:

http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=An_overview_of_map_projections

or this:

http://geology.isu.edu/geostac/Field_Exercise/topomaps/state_plane.htm

or this:

http://geospatial.osu.edu/conference/proceedings/workshops/conner.pdf

 

Texas does have a state plane as we are in zone 13, 14 and 15. I plan on calling the surveyor that is working for us and asking thesame question. I will report back with my answers once I have the answer.