Python arcpy.CreateFeatureclass_management() Examples

def generate_cls_boundary(cls_input,cntr_id_field,boundary_output,cpu_core):
    arcpy.env.parallelProcessingFactor=cpu_core
    arcpy.SetProgressorLabel('Generating Delaunay Triangle...')
    arrays=arcpy.da.FeatureClassToNumPyArray(cls_input,['SHAPE@XY',cntr_id_field])
   
    cid_field_type=[f.type for f in arcpy.Describe(cls_input).fields if f.name==cntr_id_field][0]
    delaunay=Delaunay(arrays['SHAPE@XY']).simplices.copy()
    arcpy.CreateFeatureclass_management('in_memory','boundary_temp','POLYGON',spatial_reference=arcpy.Describe(cls_input).spatialReference)
    fc=r'in_memory\boundary_temp'
    arcpy.AddField_management(fc,cntr_id_field,cid_field_type)
    cursor = arcpy.da.InsertCursor(fc, [cntr_id_field,"SHAPE@"])
    arcpy.SetProgressor("step", "Copying Delaunay Triangle to Temp Layer...",0, delaunay.shape[0], 1)
    for tri in delaunay:
        arcpy.SetProgressorPosition()
        cid=arrays[cntr_id_field][tri[0]]
        if cid == arrays[cntr_id_field][tri[1]] and cid == arrays[cntr_id_field][tri[2]]:
            cursor.insertRow([cid,arcpy.Polygon(arcpy.Array([arcpy.Point(*arrays['SHAPE@XY'][i]) for i in tri]))])
    arcpy.SetProgressor('default','Merging Delaunay Triangle...')
    if '64 bit' in sys.version:
        arcpy.PairwiseDissolve_analysis(fc,boundary_output,cntr_id_field)
    else:
        arcpy.Dissolve_management(fc,boundary_output,cntr_id_field)
    arcpy.Delete_management(fc)
    
    return 

def create_feature_class(out_path,
                         out_name,
                         geom_type,
                         wkid,
                         fields,
                         objectIdField):
    """ creates a feature class in a given gdb or folder """
    if arcpyFound == False:
        raise Exception("ArcPy is required to use this function")
    arcpy.env.overwriteOutput = True
    field_names = []
    fc =arcpy.CreateFeatureclass_management(out_path=out_path,
                                            out_name=out_name,
                                            geometry_type=lookUpGeometry(geom_type),
                                            spatial_reference=arcpy.SpatialReference(wkid))[0]
    for field in fields:
        if field['name'] != objectIdField:
            field_names.append(field['name'])
            arcpy.AddField_management(out_path + os.sep + out_name,
                                      field['name'],
                                      lookUpFieldType(field['type']))
    return fc, field_names
#---------------------------------------------------------------------- 

def execute(in_datasets, out_fc):
    # use gcs as output sr since all extents will fit in it
    out_sr = arcpy.SpatialReference("WGS 1984")

    in_datasets = in_datasets.split(";")

    arcpy.CreateFeatureclass_management(os.path.dirname(out_fc),
                                        os.path.basename(out_fc),
                                        "POLYGON",
                                        spatial_reference=out_sr)

    arcpy.AddField_management(out_fc, "dataset", "TEXT", 400)

    # add each dataset's extent & the dataset's name to the output
    with arcpy.da.InsertCursor(out_fc, ("SHAPE@", "dataset")) as cur:

        for i in in_datasets:
            d = arcpy.Describe(i)
            ex = d.Extent
            pts = arcpy.Array([arcpy.Point(ex.XMin, ex.YMin),
                              arcpy.Point(ex.XMin, ex.YMax),
                              arcpy.Point(ex.XMax, ex.YMax),
                              arcpy.Point(ex.XMax, ex.YMin),
                              arcpy.Point(ex.XMin, ex.YMin),])

            geom = arcpy.Polygon(pts,  d.SpatialReference)

            if d.SpatialReference != out_sr:
                geom = geom.projectAs(out_sr)
            cur.insertRow([geom, d.CatalogPath]) 

def copy_schema(template, new, sr=''):
    """Copy the schema (field definition) of a feature class or a table.

    Required:
    template -- template table or fc
    new -- new output fc or table

    Optional:
    sr -- spatial reference (only applies if fc) If no sr
          is defined, it will default to sr of template.

    Example:
    >>> copy_schema(r'C:\Temp\soils_city.shp', r'C:\Temp\soils_county.shp')
    """
    path, name = os.path.split(new)
    desc = arcpy.Describe(template)
    ftype = desc.dataType
    if 'table' in ftype.lower():
        arcpy.CreateTable_management(path, name, template)
    else:
        stype = desc.shapeType.upper()
        sm = 'SAME_AS_TEMPLATE'
        if not sr:
            sr = desc.spatialReference
        arcpy.CreateFeatureclass_management(path, name, stype, template, sm, sm, sr)
    return new 

def createOutputFC():
    # Input theAOI is the original first parameter (usually CLU feature layer)
    #
    # Given the path for the new output featureclass, create it as polygon and add required fields
    # Later it will be populated using a cursor.

    try:

        epsgWGS84 = 4326 # EPSG code for: GCS-WGS-1984
        outputCS = arcpy.SpatialReference(epsgWGS84)

        nasisProjectFC = arcpy.CreateScratchName("nasisProject", workspace=arcpy.env.scratchGDB,data_type="FeatureClass")

        # Create empty polygon featureclass with coordinate system that matches AOI.
        arcpy.CreateFeatureclass_management(env.scratchGDB, os.path.basename(nasisProjectFC), "POLYGON", "", "DISABLED", "DISABLED", outputCS)
        arcpy.AddField_management(nasisProjectFC,"mukey", "TEXT", "", "", "30")   # for outputShp

        if not arcpy.Exists(nasisProjectFC):
            AddMsgAndPrint("\tFailed to create " + nasisProjectFC + " TEMP Layer",2)
            return False

        return nasisProjectFC

    except:
        errorMsg()
        return False


## =================================================================================== 

def createOutputFC(dictOfFields,preFix="Temp",shape="POLYGON"):
    """ This function will creat an empty polygon feature class within the scratch FGDB.  The feature class will be in WGS84
        and will have have 2 fields created: mukey and mupolygonkey.  The feature class name will have a prefix of
        'nasisProject.' This feature class is used by the 'requestGeometryByMUKEY' function to write the polygons associated with a NASIS
        project.

        fieldDict ={field:(fieldType,fieldLength,alias)
        fieldDict = {"mukey":("TEXT",30,"Mapunit Key"),"mupolygonkey":("TEXT","",30)}

        Return the new feature class  including the path.  Return False if error ocurred."""

    try:
        epsgWGS84 = 4326 # EPSG code for: GCS-WGS-1984
        outputCS = arcpy.SpatialReference(epsgWGS84)

        newFC = arcpy.CreateScratchName(preFix, workspace=arcpy.env.scratchGDB,data_type="FeatureClass")

        # Create empty polygon featureclass with coordinate system that matches AOI.
        arcpy.CreateFeatureclass_management(env.scratchGDB, os.path.basename(newFC), shape, "", "DISABLED", "DISABLED", outputCS)

        for field,params in dictOfFields.iteritems():
            try:
                fldLength = params[1]
                fldAlias = params[2]
            except:
                fldLength = 0
                pass

            arcpy.AddField_management(newFC,field,params[0],"#","#",fldLength,fldAlias)

##            if len(params[1]) > 0:
##                expression = "\"" + params[1] + "\""
##                arcpy.CalculateField_management(helYesNo,field,expression,"VB")

##        arcpy.AddField_management(nasisProjectFC,"mukey", "TEXT", "", "", "30")
##        arcpy.AddField_management(nasisProjectFC,"mupolygonkey", "TEXT", "", "", "30")   # for outputShp

        if not arcpy.Exists(newFC):
            AddMsgAndPrint("\tFailed to create scratch " + newFC + " Feature Class",2)
            return False

        return newFC

    except:
        errorMsg()
        AddMsgAndPrint("\tFailed to create scratch " + newFC + " Feature Class",2)
        return False

## ===================================================================================