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Apologies for the newbie / basic question, but it seems to be a fairly simple concept which I can't get to work properly, and I'd be really grateful for a pointer or two!

I have a load of different georeferenced raster tif maps loaded into ArcGIS (9.2). If I update the content of one of these maps in a program outside of GIS, (i.e. photoshop or equivalent,) I want the most up to date map to show in ArcMap the next time I open it. It's linking to the file in windows, so surely it's straightforward enough to refresh the link?

Right now, I don't know how to do this without either removing the map from the GIS file and re-adding it, or navigating to the file in windows and deleting the .aux and .rrd files, which is annoying. Surely there is a setting or an easy function I can use to do this? (Please say yes?!)

I would be much obliged if anyone could offer any advice.

Thanks,

Lisa

P.S. I am just learning to GIS, and have no Python experience as yet, so please be gentle!

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  • The question seems a tad strange. Normally, ArcGis should just memorise the path of the raster. Upon opening the file in ArcGis, it just goes to the location specified, and finds the current version of that file. Only thing I could see being a problem is that your edits can't be saved to the raster file due to the file being open in arcgis at the time. Have you tried just saving the raster file, firing up ArcGis and check if the edits have been adjusted? May 14 '14 at 15:55
  • Yep, I had assumed the links would be automatic - I have ArcGIS closed, I edit the raster file, I open ArcGIS, and 9 times out of 10 (I would say occasionally it has worked that they've updated, but it's very rare!) it's usually like a cache version of my file I can see? I have to close it, delete the aux and rrd files and open again, or remove and re-add. If I check the properties of the raster the path is saved correctly in source data, so I'm not quite sure what's going on!!
    – Lisa SH
    May 14 '14 at 16:00
  • Have a look at this: resources.arcgis.com/en/help/main/10.1/index.html#//… , as it appears you load the layer from a local cache somehow. You may want to try and turn off the caching option to ensure it's a 'fresh' copy of the data you see in ArcGis May 14 '14 at 16:03
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When you edit your TIFF in photoshop or similar it may not write the georeference tags so it would be a good idea to use world file registration (.tfw).

Normally when you change a raster you must rebuild the pyramids, else not use pyramids, you don't have to especially if the images are small. To rebuild the pyramids use GDALaddO http://www.gdal.org/gdaladdo.html if you are afraid of python or build pyramids geoprocessing tool.

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