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Showing results for tags 'coordinate systems'.
Found 3 results
Creating custom coordinate system (with datum parameters TOWGS)
Kevin Malone posted a topic in Civil 3D & LDDI'm tying to create custom Coordinate System in C3D 2012 with datum parameters (Dx, Dy, Dz, Rx, Ry, Rz and scale), but during the creation process (thru MAPCSCREATE function) I don't get anywhere to input this values. As you can see on screenshot, TOWGS parameters are all "0". Only way to form some kind of datum with parameters is creating Geodetic Transformation, but I can't link/import that in my CS definition I would appreciate any help
Plotting Latitude and Longitude in Vanilla ACAD 2014
dal-designs posted a topic in AutoCAD 2D Drafting, Object Properties & InterfaceOK, so I'm an experienced CAD user but have never had to do anything but draw by metes and bounds before, so I need some direction here. I am trying to draw the location of a proposed driveway in vanilla AutoCAD 2014 in such a way that I can bring it into QGIS and/or Google Earth and lay it right in to where it will be in real life. This is just an exhibit for a developer to approve a cross-access driveway, so it doesn't have to be precise or pretty. Here's what I (think I) know so far: - drawing units have to be set to metric - coordinate system of the other data I'm using from the local COG is Texas Central State Plane (UTM14) What else do I need to do to get started?
Google Earth Image question
Tad_Thurston posted a topic in Civil 3D & LDDIn Civil 3D, under the Insert tab, there is a menu selection that allows you to insert a Google Earth image directly from Google Earth. This image is inserted to match the coordinates of your ACAD drawing. However, it does not always match the known correct line work, depending on the drawing settings. For example, if one was working on a project in California in Cal. Coordinate System, zone 2, the available coordinate systems (under the Units and Zone tab) could be HARN, NAD27 or NAD83. Then there is the transformation settings (under the Transformation tab) like: Sea Level Scale Factor and Grid Scale Factor. My question is: What are the best drawing settings to use for the best fit between the Google image and the drawing so that the image matches linework that you know is correct (based on certified surveys)? Thanks.