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I started georeferencing and I could not save my new "rectify" file, I don't know if is because of the raster or I did something wrong. Then I find out that my control layer is not accurate, it doesn't match to other shapefiles in the same geodatabase (same projected coordinate reference), neither with a basemap. How do I make sure to have an accurate control layer? Should I georeference a Google earth map first? (to their WGS_1984, then projected to WGS_1984_UTM_zone_20S) and then georeference my shapefiles and my old maps?

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"I started georeferencing" in what application? – Mapperz♦ Feb 3 at 4:05
@Mapperz probably in arcgis, theres a georeferencing toolbar – U2ros Feb 3 at 12:21
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@U2ros QGIS, SAGA, Idrisi, ERDAS, MapInfo, MapMaker, TNTmips etc all also have georeferncing capabilities, to name but a few other GIS packages. It might be ArcGIS, but then again it might not, so we need the OP to be specific before the question can be answered for their situation. – MappaGnosis Feb 3 at 13:02
There are many answers for this question in several software. I suggest a search for georeferncing. – Brad Nesom Feb 3 at 14:52
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@Mapperz, it's ArcGis 10.0. I will correct my "control" layer with an Esri imaginery, then try to georeference. But I am afraid I wont be able to save my "Rectify" (in the dialog where you save, the selection of type of data is in gray) and I dont know why, besides the fact that my control points were not balanced. – Vivian Feb 3 at 23:13
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2 Answers

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On the Save As dialog opened by Rectify from the Georeferencing pulldown on the Georeferencing toolbar there is a field called Output Location that confuses many people.

On that dialog make sure you do NOT try to enter the Output Image name - just select a folder. Then you should be able to enter an output image name in the Name field and choose its Format.

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yes it is tricky, but I follow all those steps and is in format tab, underneath the folder location is where is gray, so even if I type a name and press save, the raster in unable to be saved. Thanks for your time! – Vivian Feb 6 at 3:50
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Please check out complete & step by step tutorial (contains how to Geo-reference raster image in ArcGIS)

Details: Click here

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