I started a new drawing in Civil3d 2010. Set the coordinate system Texas North Central Zone. Connect to a raster image of the quad map - no problem. Then I go to connect to a shapefile of the original land survey county map. It comes it incredibly small and near 0,0,0 instead of in the right place. The coordinate system of the shapefile looks correct based on the metadata. I tried bring in some NGS stations that I downloaded as a shapefile and same problem. Really small and in the wrong place. Anybody have any suggestions for what I am doing wrong? I do this all the time and never have problems bringing the data in I'm guessing i have some setting wrong somewhere.
TIA
Andy Nold
It is possible that you need to bring in the data without changing the coordinate system. Seems like CIVIL3D is scaling your data and that is why it is coming in at the wrong place or you need to specify the coordinate to place the shapefile.
AS3
Just a swag but most shape files are in lat/long. Is Civil reading the other files with the shape that define the transformations. Sounds like it is not for some reason?
In Map then you specified the coordinates system home (your current drawing) then could select the coordinate system for the new shape files that you are trying to import so that it could reproject them. Coming in real small sounds like it's reading lat/long (probably decimal like 34.555595 98.35353) so if it thought this was supposed to be SPC then they would come in tiny.
I accepted the default coordinate system. The OTLS shapefile is from TNRIS and the metadata from TNRIS says that The horizontal datum used is North American Datum of 1927. When I bring in the shapefile, it is automatically selecting LL27, which is NAD27 datum, Lats & Longs; Degrees. You would think it would pop right into the right place like it normally does, but it is coming in about 1/1000th as big as it should be.
I got to go get a sammich for lunch. Will look some more when I get back.
Seems like you may need to specify a scale with the shape file. The metadata will have coordinates for the corners of the shapefile. Calculate the distance and check the distance between the two points at the 1/1000+/- scale it is coming into the drawing at, in order to calculate a scale to apply to the shapefile. Maybe?
AS3
The reason you have world files and other files with GIS is so that you don't have to do scaling. That just adds error if you try and do it by hand and is more akin to rubbersheeting.
There are several LL27's in most software selections. Equal area and several others. It is just selecting the wrong one for some reason at this point.
Funny you post this today. I'm in GIS classes all day today.
Do you need to check a box to Use World File?
Not seeing a "use worldfile" option.
Here's my data connection screen:
Click on the edit coordinate systems then see if there are several LL27's to choose from.
Andy, run a quick inverse for me
from your project to
North: 151318.75'
East: 3071330.66'
Nad 27, Texas North-Central Zone.
😉
Try the LL27WP
I would just like to comment that this is NOT a GIS problem per se but a software problem and settings. Really has little to do with GIS. Projections have been around for centuries and the NGS has been at the forefront of these.
Way to lock up my computer. It is still processing, but I will get back to you when it unlocks.
You know, I notice that it is bringing the drawing in as coordinates. The positions are like -100.3295, 33.0222 which is about the right Lat and Long. Why is it not converting the drawing to SPC?
Andy, run a quick inverse for me
What is that, the site of a still on the Louisianna state line? It's a bunch of miles, for sure.
Andy, run a quick inverse for me
The international boundary marker on the East State Line.
BTW, what did you come up with???? 🙂
Andy, run a quick inverse for me
I didn't yet. I know where your still is but I don't know where my project is yet. Scurry County is all so far. A little northeast of Snyder.
