Georeferencing a DWG in ArcGIS Pro

[Music] hello welcome to another video from eg is associates today we're going to be taking a look at how do we geo reference AutoCAD files DWG s inside of arcgis pro and this is a pretty common practice and if you've done it before in arcmap it's not that much different in arcgis pro if you've never done it before it's not a hard thing to do and the reason we do this is a lot of the files we get that come in an autocad format typically from engineers or surveyors or landscape architects and what not are not geo-referenced meaning they're not in a real-world coordinate system so when we try to bring them into our GIS they often come in well down at zero zero or never-never-land just nowhere near where it needs to be and so we can using tools in arcgis pro bring that drawing up to where it needs to be so it fits within our GIS data so we'll now look and see how that process works inside of arcgis pro ok so i'm now in arcgis pro i already have a project open with a map and what i have if i go over here into catalog I've got a subdivision here that has parcels that I need to bring in and create inside of my parcel data set here basically I want to update this parcel layer so that it includes this new subdivision so I'm going to bring in the drawing file now you can bring in the entire drawing but I just really need that the lines so that's gonna be what I bring in so I'll go ahead and select it and just drag it into my map and it comes in and if I go ahead and zoom to the layer so you can see where it has come in at see it's coming in down here and if you look at the very bottom of the map down here you'll see the coordinate readout you can see that it's down there it looks like roughly 500,000 in 500000 so it's down here really in never-never-land doesn't line up with a photography at all and certainly is not lining up with my data so certainly need a geo reference this so what I'm going to do is I already know where the subdivision belongs so that's the first step is knowing where does this go within your data set I've already done that so I'm gonna go to my map and bookmark that I've already got established for that location you can see this parent parcel right here and I'll go ahead and make sure that it is selectable so you can see which one I'm referring to so it's this parcel right here that you see highlighted in blue so this is the original parent parcel that has been subdivided and that I want to update where the data have in my AutoCAD drawing now I got from the surveyor that designed the subdivisions so next thing I want to do is get this drawing so it appears at least close to where I need it to be so I'm kind of zoom in a little bit on this get myself more centered and then up here with the AutoCAD drawing layer selected you'll see that a new tab has appeared in my ribbon the CAD layer managed tab so if I click on it you can see there's a button up here called geo reference so when I click yet it's now going to open the geo referencing tab in the ribbon so this is a new tab that just appeared by clicking on that button and the first thing I want to do as I said is get that CAD file so it appears right up here where it belongs or at least close to it so you'll see in the prepare group there's a move to display so this is going to shift the AutoCAD file up into this general area so I'm gonna click it and now you can see in orange that the CAD file has appeared up here in the general location of where it needs to be so the next thing I need to do is pick control points that match the CAD file to my GIS data and so let's get rid of this little warning that's telling me it's missing a spatial reference get rid of that because that's really annoying so I need to pick two points that matchup between the CAD file and my GIS data a zoomed out a little bit here and re-centered so I could kind of do that now the best method to do this or the the best location to pick control points is those that are kind of diagonal from one another when you geo-reference a CAD file in our GIS pro just like in arcmap you can only pick two points so we want to pick two points that we can easily identify between the data so it looks like the corners I could pick the corner so I'm gonna pick this southwestern corner and I'm going to go with this northeastern corner so I'm gonna start down here at the southwest zoom in a little bit so I make sure that I'm picking the right locations then I'm gonna go up here to add control points when I click that tool up here on the ribbon go down and pick on the location of my CAD file first you notice it is snapping you do want to make sure you're snapping is enabled so I'm going to click so I'm getting that intersection and now I'm going to match to my GIS data again making sure I'm snapping to the right location in here zoom in a little bit more and make sure that I was snapping to that right location all right they're seeing see the red circle with the X in it on the CAD file matches to the green circle with accent in my GIS data so that's the first control point so I'm gonna zoom back out a little bit and then pan up now i'm gonna pan up if it's going to cooperate with me there we go and zoom in on this northeastern corner again verify have the control points tool selected i'm going to snap to the intersection and my cat file and then to the intersection of my GIS data click that so again the red and the green targets appear and a zoom back out and pan a bit more so we can see yeah we've done okay oops a little bit too much there we go so now that I've picked those two control points I can hit apply you can see now that cat file snaps right into place where it needs to be okay this point I want to save this and what that's going to do and I click the Save button it's going to generate a world file for that CAD file so that any other drawing or I'm sorry any other maps that I use that drawing in it's going to come in in the right location it's also going to generate a prj file or projection file that lets arcgis pro and or even arcmap know what coordinate system this cad file has been geo reference to so I'm gonna click save to that and now that I've gotten that in there it's right where it needs to be so at this point I could then use this data to do several things I could say update for example the property lines layer with this I could doing that let me clear my selection and go in and they'll set this so first I'm just going to start so the only thing that is selectable are the lines from a CAD file and go to my edit tab go select select the file the lines out of the CAD file that I want with that go up here to copy then go over here to paste hit the drop down and hit paste special choose the layer that I want it to go into being the property lines and go okay so and now you can see over here in the contents pane that there are now 146 property lines selected so I successfully copied those lines over if I turn off the CAD file turn that off go ahead and clear my selection real quick you can see the property lines let me change the color so there's something different than what the CAD file happened to be we'll make them red just so they stand out so you can see that copied that over the other other thing I could do if I didn't care about the lines I just needed to split the parent parcel out into the individual parcels for the subdivision do that too so again make sure that that's the only thing that is selectable and I'm gonna make sure that parcels are editable so notice I've got parcels listed it's the only editable layer you don't have to do this this is just for safety make sure I don't accidentally edit another layer also notice the exclamation point out here to the right of the layer name that indicates that that layer is not editable that's because it's the AutoCAD file we brought in so with that I just want to use these AutoCAD lines to split the original parent parcel into the new subdivided parcels so again and go up here to my select tool select those CAD lines like so go to my edit tab here and go to the split tool and I'm going to do this split by feature so this is a new function that was added in I believe it was 2.3 version of ArcGIS Pro so my input features oops I should have already selected those are going to be my CAD lines so I'm go ahead and grab those there we go there now selecting see them kind of appearing these dashed lines my target is going to be the the original parcel that I want to split so I'm gonna click in there just got to make sure that's layer selectable there we go so it's now selectable and now that's highlighted with the the hashed fill pattern there so you can tell that that's the parcel is selected now with those with the cab line selected and then my target selected I'm now going to hit split and it runs the tool and now notice I have a hundred and sixty-six parcel polygons selected so that would be all of the parcels that are now in there and again if I clear that selection turn off the CAD file then you can see the individual parcels that have been split out using the CAD data at which point then I would hit save my edits so there you go it's just as easy as that now that same process will work not only with AutoCAD DWG files but also with DXF files or even MicroStation dgn files the same basic process will also work if you have a raster file a scanned plat an aerial photo scanned map whatever the difference being that with a raster file like that you can actually pick more than two control points you can pick as many control points as you want and choose what type of transformation you use with that but as I said really if you get a cat file that needs your referencing it is as simple as that process we just went through and then from there you can do all kinds of things with the data once you get it in the right place so hopefully you found that very helpful remember if you need any other assistance with your GIS whether it's 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Channel: eGIS Associates

Views: 14,930

Rating: 4.9039998 out of 5

Keywords: ArcGIS, ArcGIS Pro, GIS, georeference, coordinate system, AutoCAD, dwg, dxf, dgn, Esri, converting, convert, update, project, eGIS, mapping

Id: Kwk5ndihFd0

Length: 14min 41sec (881 seconds)

Published: Thu Mar 28 2019