[mapserver-users] Re: Problem with Class Expression

[Stephen Woodbridge]

It is likely a computed column that does not exist in the file as 
ogrinfo is indicating. In some other program it is computing the AREA on 
fly and presenting is as a virtual column but mapserver does not do that 
for you.

Ask on the GDAL/OGR list how to add a column and populate it with the 
shape AREA.

-Steve W

On 3/29/2012 1:45 PM, Marc-André D. wrote:
> It seems that my column 'AREA' is a calculated one....but how could I
> interrogated that column??? I think the column 'AREA' refer to an other
> shapefile....but how could I create an expression that will interrogate
> another shapefile????
>
>
>
> INFO: Open of `centroide_pts.shp'
>        using driver `ESRI Shapefile' successful.
>
> Layer name: centroide_pts
> Geometry: Point
> Feature Count: 3763
> Extent: (192120.737200, 4986442.910500) - (212410.721754, 5003132.634000)
> Layer SRS WKT:
> PROJCS["NAD_1983_MTM_7",
>      GEOGCS["GCS_North_American_1983",
>          DATUM["North_American_Datum_1983",
>              SPHEROID["GRS_1980",6378137.0,298.257222101]],
>          PRIMEM["Greenwich",0.0],
>          UNIT["Degree",0.0174532925199433]],
>      PROJECTION["Transverse_Mercator"],
>      PARAMETER["False_Easting",304800.0],
>      PARAMETER["False_Northing",0.0],
>      PARAMETER["Central_Meridian",-70.5],
>      PARAMETER["Scale_Factor",0.9999],
>      PARAMETER["Latitude_Of_Origin",0.0],
>      UNIT["Meter",1.0]]
> ID: Real (11.0)
> NO_LOT: String (30.0)
> ECHELLE: String (15.0)
> SOURCE: String (50.0)
> ANGLELOT: Real (10.2)
> ANGLE_MANU: String (1.0)
> VERIF: String (10.0)
> PROB_SUP: String (10.0)
> PROB_NOLOT: String (10.0)
> LEGVERIF: String (10.0)
> MA_NAD27: String (16.0)
> SUP: String (16.0)
> ANGLE: Real (16.4)
> IDENT: String (100.0)
> SUPERFICIE: String (50.0)
> X_COORD: Real (18.5)
> Y_COORD: Real (18.5)
> MATRICULE: String (16.0)
> MA_NAD83: String (16.0)
> CENTROIDE: String (4.0)
> DATE: Date (10.0)
> FEUILLET: String (50.0)
> C1_NAD83: String (4.0)
> C2_NAD83: String (7.0)
> POSITION: String (30.0)
> TAILLE: Real (7.2)
> MAT_83: String (15.0)
> X_COORD: Real (18.5)
> Y_COORD: Real (18.5)
>
>
> -----
> -----------------------------
> Marc-André Dion
> B.Sc Géomatique appliquée
> Université de Sherbrooke
> --
> View this message in context: http://osgeo-org.1560.n6.nabble.com/Problem-with-Class-Expression-tp4668046p4668585.html
> Sent from the Mapserver - User mailing list archive at Nabble.com.
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