Well, I just discovered this, and thought maybe it might help someone else. Or maybe I am just the last to figure it out....
We were importing rectified geo-tiffs into our drawing as background using mapiinsert, and had a couple which refused to come in at the correct location. (These tiffs cover about 6 to 8 miles in length each). What we discovered is that with our units set to 2 decimal places, the units per pixel was "shrinking" our tiff by some 50 or 75 feet at the upper right. If we reset our units to use 6 or 8 decimal places, it came in at the right location. Since the image is placed at the correct state plane coordinates at the lower left, the upper right can get to be off by quite a bit.
Hope this helps someone else.
AKSteve
indeed quite a bit,
so when inserting two adjoining tiffs you should clearly mark the problem ?
What version of Map and/or Civil do you use?
chr.
> indeed quite a bit,
> so when inserting two adjoining tiffs you should clearly mark the problem ?
>
> What version of Map and/or Civil do you use?
>
> chr.
We are using Map 3d 2010, and civil3d 2011. We really have to update map to 2011 so it can see the proxy objects created in civil3d 2011.
It seems that as long as we use at least 6 decimal places, we can insert adjoining tiffs and not see a mis-alignment. In fact, most of the GIS data we get locally has more error built into it than we will see from the tiffs.