Hi,
My intention is to georeference an image so as to create a Swipe Map in AGOL. First, I add my control points, rectify, then analyze before attempting to share and finally publish in AGOL. The other day I ran through these steps and it worked fine. I was able to then create the app for a simple Swipe Map. Using the same steps while adding another image to the same map back in Desktop I now continually get the spatial reference undefined error when analyzing. Or the newly created projection through rectifying just disappears and I have to add the control points all over again.
I've added some screenshots.
Thanks for any help.
-Jared
They aren't georeferenced to anything except the screen(?) since the upper left coordinate is 0,0. Are you sure that the inputs had a coordinate system in the first place?
Hi Dan,
I georeferenced the images to the basemap and it gave them WGS 84, the same GCS the data frame has.
The top of the two attached sceenshots shows the message I got after georeferencing and rectifying the image. I checked in the layer's properties tab to make sure it had a GCS and it did, WGS 84. And when analyzing in the Tile Package menu it still gave me this error?
The bottom of the two attachments shows when I attempted to georeference another image. I georeferenced Wesley Tnsp first and it took on WGS 84. When I georeferenced Wilmington1870 Wesley was gone and so was it's GCS. I had to add all the control points all over again and GCS disappears again when trying to analyze it, and so on and so forth over again..
So just to clarify, you already ran through all these steps and it worked, and that work still exists and is successfully georectified? Is that correct? If so, can you use the previously georectified image to georeference this one to?
Hi Jared,
Take a look at the check-points:
- Before adding image to ArcMap, define the spatial reference of the image in ArcCatalog (Image properties) itself.
- After georeferencing an image, click "Update Georeferencing"
- When a new image (with defined spatial reference) is addedto the data frame, make sure that the image name in the georeferencing toolbar is pointing to the newly added image.
Sephe,
Yes, at first I ran through these steps and everything was fine, all the way up to final step of creating the web app (swipe map). Maybe it was a glitch but after trying on another image, using the same process, the GCS would be there one minute and gone the next.
I actually deleted the tile package from AGOL now to start all over. So, the whole web app is discontinued for now- until I get passed this glitch.
Hi Jayanta,
I attempted defining the spatial reference in ArcCatalog and in ArcToolbox. It gave me this message:
This was also a clean image. As in, I downloaded it again from the website, so it didn't have any orientation to ArcMap.
have you gone through this section on Georeferencing a raster ?
The warning is fine, since the raw image can have any extent irrespective of the spatial reference. This is where you start georeferencing.
@ Dan: I read that, thanks.
@ Jayanta: What you see of the image in this attachment is after giving it a spatial reference in ArcCatalog. I can't start adding any control points to this raster as for some reason it's not all there.
So, I carried out the proceeding steps which did work:
1. Add raster and basemap to Desktop
2. Add control points
3. On the Georeference Toolbar, "Update Georeferencing" - this worked in giving it a GCS
4. Left click on the layer and "save as a layer file"
5. In the File menu, "Share as" then "Tile Package"
After publishing the tiles in AGOL, I'm still having the same problems with portions disappearing:
Notice the corner missing on the smaller raster and the top missing on the bigger raster. Before this, I had a small problem with the whole raster disappearing after zoomed in past a certain scale. But to remedy that I deleted that image and went back to Desktop. On Desktop I brought the file back in and "Share as", "Tile Package" window under "Tile Format" I gave it the highest level of detail: "Building". Of course, this took the longest as it had the most tiles to upload, but I was at least able to zoom in enough to read the raster.
But, now portions are missing?
Thanks to both of you for the help so far.
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