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I have created a shapefile (point data) and wish to change some parameters in the files table data. I can edit the data and see the coresponding change in my my symbology. However, when I save the shapefile, the data and symbology revert back to the way it was before the edits. What am I doing wrong?

I have a shape file of a series of points. One column in my table has values between 1 and 6 that show up as color-coded points on my map. The data for the column came from a spreadsheet that I had joined with the shapefile. I was trying to update certain values in the column (I set the shapefile so I could amend it, opened the table and changed the value. The color of the point on my map changed, however, when I tried to save the changes, the color (and value) reverted to the previous settings. I did find a way to make it work. I amended my original spread sheet in Excel and exported it as a dbf. I then unjoined the dbf and shapefile and rejoined with the new data. Don't know if that's the correct way, but it worked.

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which software? –  underdark Feb 11 '13 at 17:46
    
which application? In ArcGIS you require layer to create (.lyr) files for preserving symbology. Right Click the layer and save as layer. –  Mapperz Feb 11 '13 at 17:46
    
Sorry, that should be Quantum GIS. –  PKappen Feb 11 '13 at 18:02
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I thnik we need to hear how you are editing, and what value you are editing, perhaps the field properties also. –  Brad Nesom Feb 11 '13 at 19:39
    
#Change all Values in a Field of an Attributtable #Here the first and the second Field with a part of the Layername in the First Field #and a Qvariant Value in the second field #Attention!!! All Field values will be overwritten #H.Wallwitz 12. Februar 2013 22:08 qgis.utils.iface from PyQt4.QtCore import * vlayer = qgis.utils.iface.activeLayer() #Ermittle den Layernamen ab der 3. Position nutzwert = vlayer.name() strlang = len(nutzwert) strteil = nutzwert[3:strlang] #-------------------------------------- feat = QgsFeature() attrs = feat.attributeMap() fid = 0 caps = layer.dataProvider().capabi –  user15123 Feb 12 '13 at 21:33
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2 Answers

I had the same issue from time to time. I found that it is best to open the attribute table, edit the data, save the data before closing the table, and then close. it should work. it is a glitch. but generally works right.

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Thanks for the input. I tried it as you suggested, unfortunately, it still didn't work. –  PKappen Feb 11 '13 at 20:18
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Also, remember to click away from the last field you edit before saving or the edited field won't be saved. –  nhopton Feb 11 '13 at 20:29
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It sounds like what you need to edit is actually the table not the shape file.
Otherwise you could export the shapefile again, after you join your table. you would
then have a shapefile with all the values from the join table. and your edit to the
shapefile should work correctly then.

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