Georeferencing a PDF Map in ArcMap

okay I'm going to walk you through the steps on how to georeference a PDF image in arcmap so the first step is you want to set your data frame coordinate system so I'm going to go data frame properties this case I've already done it but essentially you're going to go to projected coordinate system we're gonna you work with UTM nad 1983 and we're working with in zone 10 so that's the one you're going to work with I'm going to hit OK and the next step to bring in a PDF in arcmap you actually need to use a special tool so we're going to put up this arctoolbox it's little red box go to conversion tools and we're going to PDF to tiff open this up and the input in my case is going to be this base 7 aerial image PDF and my export is going to go right into that same folder and as you've already done I'm going to turn it again phase 7 aerial I like putting no spaces between files so this this warning will come up it means that you have to put dot tip at the end and then it should work oh oh I'm going to replace it whoops v2 version 2 great so now it's making this conversion and here is my image now you're going to notice that there are that's why this little warning comes up but there's no coordinates associated with this image so the next step is to go customize toolbars geo referencing toolbar so we're going up this toolbar here Oh an important part here is that you need to find this image on an existing map to get some coordinates and you need to find coordinates for points that you can identify in the image so for instance at the end of this road would be a great place or at the end of this road so you need to go into Google Earth or another joyous application to find those coordinates so here I am in Google Earth and this is the same location as my map so if you look at this road right here and at this road I was able to find those on my image so I want to capture the coordinates here and then here and I like working in UTM so I'm going to go to tools options and we're going to pick the Universal transverse Mercator as ur as the the coordinate system we're working with the projection we're working with so here you go I'm going to write those coordinates down and then I'm going to write these coordinates down so I wrote my coordinates now and now I want to add these coordinates to my map and so what you're going to do is you're going to do add control points in this geo referencing toolbar click on that you you to click on that you also want to open up view link table ok and now once you're ready to add some control points so I'm going to start here and I'm going to select this point right here and see how it drags out in there it says 1 and this line dries out I'm going to right click input X Y so my x coordinates for this one are five four six zero one seven six and my Y coordinates are five one nine five nine four so you should always have six for your oops I didn't do that right huh your X should have six and your Y should have seven so my add 23 to be five one five nine four and this one should be five four six zero one seven six okay oh where did it go well I've now assigned it coordinates so it won't be in this location anymore so you're going to right-click on it and go zoom to layer and now you're located to where it should be in with real-world coordinates that's always a good you need to because of some warping with the projection to always need to add at least two control points preferably if they were spaced apart a little bit more now right here there's the name of the road that's kind of difficult and it makes it hard to assign the the actual point on this map I'm going to estimate for this map but if you work I believe that the under the sea is where in the image is the end of the road so I'm going to right click oops and click on it so I'm adding another control point right click and put x and y so now we're going to add these points so remember your X should be five one nine seven four eight and these Y coordinates will be followed four six zero four six nine great we're going to zoom to layer again and see now by assigning to coordinates you see how it's a little bit tilted and that's the way it should be because of the projection and because maps are 2d image on a three-d geoid okay so now the next last step is to update your referencing good so now what you can export this map if you want to use this and then applications like Venza PDF maps or something like that so I'm going to do that file export map I'm going to save it as um a PDF there we go I can see it for a second and it's my real image for phase seven and the last piece here is you got to go into advanced and ensure that says export map to your reference information safe there you go now you've got a geo-referenced image for other uses

Channel: ThinkForestEcology

Views: 62,852

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Id: 7kTidTrYclE

Length: 7min 11sec (431 seconds)

Published: Mon Mar 13 2017