[Qgis-user] Loss of data

[Pedro Machado Monteiro]

Hey Vladut:

If you succeed in recovering the previous *dbf* file, you can join it again
to the recent damaged shapefile, by the common field of area, provided your
previous field SUP (area) was actually the area of the geometry elements.


Before joining, recalculate and/or round the area fields, in order to fix
them to the same and appropriate number of decimals (and, if necessary,
convert them to string),  so that you can assure exact matches.

Best regards

Pedro Monteiro












Andrea Peri <aperi2007 at gmail.com> escreveu no dia domingo, 15/11/2020 Ã (s)
11:36:

> Restoring only the dbf will do am error for a shapefile because it is sync
> with shp and shx.
> The retrieve should fo for all three files or nothing.
> The dhx could be recalculate from dbf and shp. But dbf and shp must be
> sync-ed.
>
> A.
>
>
> Il dom 15 nov 2020, 11:37 Yury <yury.zammit at gmail.com> ha scritto:
>
>> Windows has a feature called previous versions. Locate the shape files on
>> explorer, look for the dbf file, right click, properties and see if you
>> have any previous versions that you can restore.
>>
>> On Sun, 15 Nov 2020, 10:45 Francesco Pelullo, <f.pelullo at gmail.com>
>> wrote:
>>
>>> Ciao Vladut,
>>>
>>> I'm sorry, you have no chanches to recover deleted attributes.
>>>
>>> You need to populate attributes again.
>>>
>>> However, in my mind, this could be not a impossible job.
>>>
>>> SUP (area) attribute is a geometry dependant value, you could calculate
>>> areas again with a simple string in field calculator.
>>>
>>> TIPO (Type) attribute is the real problem, but since I suppose you
>>> extracted it from some public data source, maybe you could use field
>>> calculator again for extract data in minutes.
>>>
>>> Don't worry, these are common experiences that would drive you to a more
>>> prudent jobs management.
>>>
>>> Also hope you will adopt another file format (.gpkg is great) and leave
>>> shapefiles.
>>>
>>> Ciao
>>> Francesco
>>>
>>>
>>>
>>> Il dom 15 nov 2020, 10:12 Vladut Constandoiu <vladutco at gmail.com> ha
>>> scritto:
>>>
>>>> Good morning,
>>>>
>>>> My name is Vladut Constandoiu, I'm a university student from Trento,
>>>> Italy and I'm using QGis for my master thesis.
>>>> Yesterday I had a very unpleasant experience with QGis. I have a
>>>> shapefile that contains all of the different areas of the
>>>> river's hydrological basin on which I'm doing my project; every element has
>>>> two attributes: type (TIPO) and area (SUP). Somehow I managed to erase
>>>> those attributes from the attribute table and could not do undo (ctrl+z or
>>>> anything else) since the auto-save plug-in activated exatly 2 seconds
>>>> after  my mistake and saved the changes. The shapefile contains about 6900
>>>> elements, and they were all sorted by use, while now they are just areas
>>>> without any information.
>>>> Is there any way to recover a previous version of that shapefile so
>>>> that I don't have to spend uncountable hours putting all the attributes
>>>> back in?
>>>> Here are three pictures of my work, previously and after the loss of
>>>> information.
>>>>
>>>> Before data loss:
>>>> [image: image.png]
>>>>
>>>> After data loss + legend of types of area:
>>>> [image: image.png]
>>>>
>>>> Attribute panel:
>>>> [image: image.png]
>>>>
>>>> I would be enormously grateful to anyone who could help me find a
>>>> solution for this mess.
>>>>
>>>> Thank you very much in advance and have a nice day.
>>>> Sincerely,
>>>> Vladut Constandoiu
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