MAP tool of the day - ADERSHEET (rubbersheet)

from MAP3D 2006 help:

ADERSHEET (Rubber Sheet command)
Performs rubber sheeting on selected objects
Rubber sheeting is a nonuniform adjustment of a data set based on the movement of known control points to new locations. For example, data collected by aerial survey may be inaccurate because of flight alignment and camera inaccuracies. By comparing this data with accurate ground survey data, the aerial data can be stretched or rubber sheeted over the accurate data using control points and monuments common to both data sets.
Use rubber sheeting when you want two or more different data sets from different sources to align geographically: for example, when stretching a new subdivision map into a preexisting parcel map.

Note that objects that have a given shape, such as circles, arcs, and ellipses, retain their original shape.

Use rubber sheeting only when it is absolutely necessary, because it can severely compromise the accuracy of your data.
Because rubber sheeting is not a linear transformation, it is difficult to reverse the effects of the transformation and return a drawing to its original state. You should save a copy of your original drawing before you perform a rubber sheeting operation.

Changing Scale
Do not rubber sheet two maps drawn at different scales. If you do, the command matches objects and changes the original scaling of text and blocks to match the new scaling, which can change data significantly. You should use rubber sheeting as a last resort after exhausting other methods of object editing and coordinate adjustment.


Anonymous said...

I'm using Civil 3D Land Desktop Companion 2008.

Is there some trick with the ADERSHEET command when it comes to image files?

I've scanned an old survey and xrefed it into my drawing file. (It's a simple retangular site.) I then rotated and scaled the image to align two of the lot corners. I then rubber sheeted the image in an attempt to align the other two corners.

For some reason, it's maintaining the aspect ratio, and not stretching the X independent of the Y.

I have a vague recollection of this happening before, but I don't remember what I did to fix it.

Any suggestions would be greatly appreciated.



Mistress of the Dorkness said...


If I'm recalling this correctly, you can't stretch an image like that...

I believe that the work around is to... ~dusting off memory~ turn the image into a block... and then stretch the block.

If that doesn't work, I'd have to give this a pass and recommend that you try checking out my favorite Civil3D blog... http://www.civil3d.com/