Hi Michaël,
Even Rouault answered me>
>> Why so many decimals in "id" and "attr"? Doesn't definition (11.0) in
>> dbf file mean that it has max 11 numbers and 0 decimals, thus it is an
>> integer?
> Yes, but with 11 figures, you can have an integer that is more than a signed
> 32 bit integer, hence the choice of the shapefile >driver to expose those
> fields as real to avoid integer overflow.
I suppose there is no need to change OJ behaviour.
-Jukka-
Lähettäjä: Michael Michaud [mailto:m.michael.mich...@orange.fr]
Lähetetty: 19. toukokuuta 2014 20:22
Vastaanottaja: jump-pilot-devel@lists.sourceforge.net
Aihe: Re: [JPP-Devel] Integers stored by OpenJUMP become Real in GDAL
Hi Jukka,
Basic data types of dBase III format are :
C (Character)
All OEM code page characters.
D (Date)
Numbers and a character to separate month, day, and year (stored internally as
8 digits in YYYYMMDD format).
N (Numeric)
- . 0 1 2 3 4 5 6 7 8 9
L (Logical)
? Y y N n T t F f (? when not initialized).
M (Memo)
All OEM code page characters (stored internally as 10 digits representing a
.DBT block number).
AFAIK, OpenJUMP uses only C, D and N
For integers, it exports a numeric of length 11 with 0 decimals
For doubles, it exports a numeric of length 33 with 16 decimals
While reading a dbf, OpenJUMP reads column with 0 decimal as integers and
columns with 1 decimal or more as double
That said, dbase format has evolved a lot since version III and binary integer
may exist now,
Not sure that using other data types is a good idea though. In your case, I
don't know if GDAL
looses the "number of decimal places", but this info is all we need to know if
an attribute is
an integer or a double/decimal.
Michaël
Hi,
If I create an attribute of type integer in OpenJUMP and save the layer into
shapefile, GDAL/OGR is reporting that the datatype is "real (11.0)". However,
if I reload the shapefile back to OJ the datatype is still Integer. Do we write
the integer datatype in some odd way or is it GDAL that interprets is wrongly?
-Jukka Rahkonen-
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