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
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