Vous trouverez ci-dessous un moyen d'accéder aux coordonnées de latitude et de longitude du fichier de formes ESRI, entre autres bits d'informations tels que la référence spatiale, les attributs de champ, les valeurs de champ, etc., à l'aide de Python. Le code ci-dessous ne fonctionne que pour les polygones et les points (car je n'ai pas encore écrit le code pour les polylignes). J'ai essentiellement bricolé du code que j'ai trouvé éparpillé dans l'aide d'ArcGIS Desktop 9.3, ajouté quelques-unes des miennes et rassemblé dans une seule fonction. Il a été écrit avec ArcGIS 9.3. Vous devriez pouvoir passer un fichier de formes polygonal ou un fichier de formes ponctuelles et la logique le dirigera en conséquence.
def get_shapefile( shape_file ):
# Import native arcgisscripting module
import arcgisscripting
# Create the geoprocessor object
gp = arcgisscripting.create(9.3)
# Identify the geometry field
desc = gp.Describe( shape_file )
shapefieldname = desc.ShapeFieldName
# Get shapefile Name
print
print 'Shapefile Name: ', desc.Name
# Get the spatial reference
spatial_reference = desc.SpatialReference.Name
print 'Spatial Reference: ', spatial_reference
print
# Create search cursor
rows = gp.SearchCursor( shape_file )
row = rows.Next()
# Enter while loop for each feature/row
while row:
# Create the geometry object
feat = row.GetValue(shapefieldname)
print '*' * 30
print
print 'Geometry related Information'
print
# Get Geometry Type
geometry_Type = feat.Type
print 'Geometry Type: ', geometry_Type
# Get the area of the feature
geometry_Area = feat.Area
print 'geometry_Area; ', geometry_Area
# Get the centroid for the feature
geometry_Centroid = feat.Centroid
print 'geometry_Centroid:', geometry_Centroid
# Get the extent for the feature
geometry_Extent = feat.Extent
print 'geometry_extent: ', geometry_Extent
print
print 'Get Attribute Table Information'
# Get all the fields for the feature class
fields = desc.Fields
total_number_of_fields = len( fields )
print 'Total number of fields: ', total_number_of_fields
print
print 'List attribute table related information:'
print
field_num_cntr = 0
# Loop through all the fields in the feature class
for field in fields:
print '*'*5, field_num_cntr, '*'*5
print
print 'field Type: ', field.Type
print 'Scale: ', str(field.Scale)
print 'Precision: ', str(field.Precision)
print field.Name, '=> ', row.GetValue( field.Name )
print
field_num_cntr += 1
if geometry_Type == 'polygon':
# Variable to keep track of how many multipart polygons are in
# featureclass
partnum = 0
# Count the number of points in the current multipart feature
partcount = feat.PartCount
print
print 'Number of polygons in feature class: ', partcount
print
# Enter while loop for each part in the feature (if a singlepart feature
# this will occur only once)
while partnum < partcount:
# Print the part number
print "Part ", str(partnum), "of", partcount, ":"
print
part = feat.GetPart(partnum)
pnt = part.Next()
pntcount = 0
# Enter while loop for each vertex
while pnt:
# Print x,y coordinates of current point
print 'X coord:', pnt.x, 'Y coord:', pnt.y
pnt = part.Next()
pntcount += 1
# If pnt is null, either the part is finished or there is an interior ring
if not pnt:
pnt = part.Next()
if pnt:
print "Interior Ring:"
partnum += 1
print
print 'Number of coordinates in feature class: ', pntcount - 1
print
elif geometry_Type == 'point':
feat = row.GetValue(shapefieldname)
# Get coords
pnt = feat.GetPart()
# Print x,y coordinates of current point object
print 'X coord:', pnt.x, 'Y coord:', pnt.y
row = rows.Next()
your_shapefile = 'Path\To\Your\Shapefile.shp'
get_shapefile( your_shapefile )