9章代码

9.1 修改字段长度

#coding=utf8
import arcpy

import os
import sys
import math

def Main():

    fm1 = arcpy.FieldMap()

    fms = arcpy.FieldMappings()
    for field in arcpy.ListFields(inFeature):
        if field.type!="Geometry" and field.type!="OID" and field.editable:
            fm = arcpy.FieldMap()
            myFieldname=field.name
            arcpy.AddMessage("myFieldname=="+myFieldname)
            fm.addInputField(inFeature, myFieldname)
            fm.mergeRule="First"
            outputField=fm.outputField
            outputField.name =myFieldname
            if myFieldname==FieldName:
                outputField.length=Fieldlen #修改
            fm.outputField=outputField #必须的
            fms.addFieldMap(fm)

    outPath, outFC = os.path.split(outFeature)

    arcpy.FeatureClassToFeatureClass_conversion(inFeature, outPath, outFC, field_mapping=fms)

inFeature  = arcpy.GetParameterAsText(0)
FieldName  = arcpy.GetParameterAsText(1)
Fieldlen=arcpy.GetParameter(2)
outFeature=arcpy.GetParameterAsText(3)

Main()

9.2.2 修改字段类型

#coding=utf8
import arcpy

import os
import sys
import math

def Main():

    #fm1 = arcpy.FieldMap()

    fms = arcpy.FieldMappings()
    for field in arcpy.ListFields(inFeature):
        if field.type!="Geometry" and field.type!="OID" and field.editable:
            fm = arcpy.FieldMap()
            myFieldname=field.name
            arcpy.AddMessage("myFieldname=="+myFieldname)
            fm.addInputField(inFeature, myFieldname)
            fm.mergeRule="First"
            outputField=fm.outputField
            outputField.name =myFieldname
            if myFieldname==FieldName:
                outputField.length=Fieldlen
                outputField.type=Fieldtype

                arcpy.AddMessage("Fieldlen=="+str(Fieldlen))

            fm.outputField=outputField #必须的
            fms.addFieldMap(fm)

    outPath, outFC = os.path.split(outFeature)
    try:
        arcpy.FeatureClassToFeatureClass_conversion(inFeature, outPath, outFC, field_mapping=fms)
    except Exception as e:
        #print e.message
        arcpy.AddError(e.message)

inFeature  = arcpy.GetParameterAsText(0)
FieldName  = arcpy.GetParameterAsText(1)
Fieldtype=arcpy.GetParameterAsText(2)
Fieldlen=arcpy.GetParameter(3)
outFeature=arcpy.GetParameterAsText(4)

Main()

9.3  获得一个省有多少的城市

#coding=utf8
import arcpy

import os
import sys
import math

def getCount(inFeature):
    result = arcpy.GetCount_management(inFeature)
    count= int(result.getOutput(0))
    return count

def Main():
    count=getCount(sFeature)
    if count < 1:
        arcpy.AddMessage(sFeature+u"没有数据")
        return
    yl_999=arcpy.env.scratchWorkspace+"/yl_999" #in_memory/yl_999" #

    fms = arcpy.FieldMappings()
    fms.addTable(sFeature)
    #fms.addTable(cityFeature) 考虑到和sFeature相同的字段
    newname=cityFieldName
    for field in arcpy.ListFields(cityFeature):
        if field.type!="Geometry" and field.type!="OID" and field.editable:
            fm = arcpy.FieldMap()
            myFieldname=field.name
            fm.addInputField(cityFeature, myFieldname)

            if myFieldname.lower()==cityFieldName.lower():

                fm.mergeRule="Join"
                fm.joinDelimiter=","
            else:
                fm.mergeRule="First"

            outputField=fm.outputField
            if FieldExists(sFeature,myFieldname):
                outputField.name =myFieldname+"_1"
                if myFieldname.lower()==newname.lower():
                    newname=myFieldname+"_1"
            else:
                outputField.name =myFieldname
            if myFieldname==cityFieldName:
                outputField.length=99999
            fm.outputField=outputField #必须的
            fms.addFieldMap(fm)

    arcpy.SpatialJoin_analysis(sFeature, cityFeature, yl_999, "#", "#", fms)

    #arcpy.AddMessage("newname="+newname)
    scursor=arcpy.da.SearchCursor(yl_999, newname)
    with arcpy.da.UpdateCursor(sFeature, FieldName) as myupdatecursor:
        for row in myupdatecursor:
            srow=scursor.next()
            mystr=srow[0]
            if mystr==None:
                mystr=""

            row[0]=mystr
            myupdatecursor.updateRow(row)
    del scursor
    arcpy.Delete_management(yl_999)

sFeature  = arcpy.GetParameterAsText(0)
FieldName  = arcpy.GetParameterAsText(1)
cityFeature=arcpy.GetParameterAsText(2)
cityFieldName=arcpy.GetParameterAsText(3)

Main()

9.4   按字段最长合并

#coding=utf8
import arcpy

import os
import sys
import math


def initProgress(hint,num):
    arcpy.SetProgressor("step", u"正在"+hint,0,num,1)
def step():
    arcpy.SetProgressorLabel(u"正在进行....")
    arcpy.SetProgressorPosition()
def freeProgress():
    arcpy.ResetProgressor()

def getCount(inFeature):
    result = arcpy.GetCount_management(inFeature)
    count= int(result.getOutput(0))
    return count
def getmapidx(fms,fieldname):
    idx=0
    for field in fms.fields:

        if field.name.lower()==fieldname.lower():
            return idx

        idx=idx+1
    return -1

def getfms(fms):
    num=fms.fieldCount
    arcpy.AddMessage("fieldCount={0}".format(num))
    arcpy.AddMessage("fieldValidationWorkspace={0}".format(fms.fieldValidationWorkspace))
    arcpy.AddMessage("exportToString={0}".format(fms.exportToString()))
    for field in fms.fields:
        arcpy.AddMessage("===========outfieldname={0},length={1},type={2}".format(field.name,field.length,field.type))
    for fm in fms.fieldMappings:
        arcpy.AddMessage("inputFieldCount={0}".format(fm.inputFieldCount))
        arcpy.AddMessage("joinDelimiter={0}".format(fm.joinDelimiter))
        arcpy.AddMessage("mergeRule={0}".format(fm.mergeRule))

        field=fm.outputField
        arcpy.AddMessage("out fieldname={0},length={1},type={2}".format(field.name,field.length,field.type))
        num=fm.inputFieldCount
        for i in range(num):
            arcpy.AddMessage("{0}=InputFieldName={1}".format(i,fm.getInputFieldName(i)))
            arcpy.AddMessage("{0}=getInputTableName={1}".format(i,fm.getInputTableName(i)))
def Main():

    #fm1 = arcpy.FieldMap()

    features=inFeatures.split(";")
    num=len(features)
    inFeature=features[0]
    if num==1:
        arcpy.Select_analysis(inFeature, outFeature)
        return

    arcpy.AddMessage("inFeature="+inFeature)
    fms = arcpy.FieldMappings()
    for Feature in features:
        fms.addTable(Feature) #如果这个样，把他的所有对照都自动加过

    for field in arcpy.ListFields(inFeature):
        if field.type!="Geometry" and field.type!="OID" and field.editable:

            myFieldname=field.name

            maxlen=-1;
            for i in range(num):
                flen=getFieldlen(features[i],myFieldname)

                if flen>maxlen:
                    maxlen=flen
            idx=getmapidx(fms,myFieldname)
            arcpy.AddMessage("idx=="+str(idx))
            if idx>-1:
                fm=fms.getFieldMap(idx)
                outputField=fm.outputField
                if outputField.length!=maxlen:
                    outputField.length=maxlen
                    #outputField.length=900
                    fm.outputField=outputField #必须的

                    arcpy.AddMessage("myFieldname============="+myFieldname+":maxlen="+str(maxlen))
                    fms.replaceFieldMap(idx,fm)
    getfms(fms)
    #outPath, outFC = os.path.split(outFeature)
    try:
        arcpy.Merge_management(features, outFeature,fms) #一定要加对照，不然自动了，用了2个小时的教训
    except Exception as e:
        #print e.message
        arcpy.AddError(e.message)

inFeatures  = arcpy.GetParameterAsText(0)
outFeature=arcpy.GetParameterAsText(1)

Main()

9.6.1  联合

#coding=utf8
import arcpy

import os
import sys
import math

def getCount(inFeature):
    result = arcpy.GetCount_management(inFeature)
    count= int(result.getOutput(0))
    return count
def getWorkspace(inFeature):
    desc = arcpy.Describe(inFeature)
    path=desc.path.lower()
    if path.endswith(".mdb") or path.endswith(".gdb"):
        return path
    if os.path.isdir(path):#shp
        return path
    outPath, outFC = os.path.split(path)
    return outPath


def getValueTable(vt):
    arcpy.AddMessage("columnCount={}".format(vt.columnCount))
    arcpy.AddMessage("rowCount={}".format(vt.rowCount))
    arcpy.AddMessage("exportToString={}".format(vt.exportToString()))
    rowCount=vt.rowCount
    columnCount=vt.columnCount
    for i in range(rowCount):
        for j in range(columnCount):
            arcpy.AddMessage("row={0},col={1},value={2}".format(i,j,vt.getValue(i,j)))
            arcpy.AddMessage("row={0},col={1},Truevalue={2}".format(i,j,vt.getTrueValue(i,j)))

def Main():
    # Set the workspace. List all of the feature classes in the dataset
    arcpy.env.workspace = inworkspace
    feature_classes = arcpy.ListFeatureClasses(feature_type="Polygon")
    num=len(feature_classes)
    # Create the value table for the Analysis Union tool with 2 columns
    value_table = arcpy.ValueTable(2) #多少列,2
    i=1

    # Iterate through the list of feature classes
    for fc in feature_classes:
        # Update the value table with a rank of 2 for each record, except
        #   for BigBog
        myfc=inworkspace+os.sep+fc
        value_table.addRow(myfc + " "+str(i))
        arcpy.AddMessage("myfc={}".format(myfc))
        i+=1
    getValueTable(value_table)
    arcpy.Union_analysis(value_table, outFeature)

inworkspace  = arcpy.GetParameterAsText(0)
outFeature=arcpy.GetParameterAsText(1)

Main()

9.6.2   融合列子

#coding=utf8
import arcpy

import os
import sys
import math


def initProgress(hint,num):
    arcpy.SetProgressor("step", u"正在"+hint,0,num,1)
def step():
    arcpy.SetProgressorLabel(u"正在进行....")
    arcpy.SetProgressorPosition()
def freeProgress():
    arcpy.ResetProgressor()

def getCount(inFeature):
    result = arcpy.GetCount_management(inFeature)
    count= int(result.getOutput(0))
    return count
def getValueTable(vt):
    arcpy.AddMessage("columnCount={}".format(vt.columnCount))
    arcpy.AddMessage("rowCount={}".format(vt.rowCount))
    arcpy.AddMessage("exportToString={}".format(vt.exportToString()))
    rowCount=vt.rowCount
    columnCount=vt.columnCount
    for i in range(rowCount):
        for j in range(columnCount):
            arcpy.AddMessage("row={0},col={1},value={2}".format(i,j,vt.getValue(i,j)))
            arcpy.AddMessage("row={0},col={1},Truevalue={2}".format(i,j,vt.getTrueValue(i,j)))
def DissolveVt():
    dissolveFields = [groupField]

    if sumField=="":
        arcpy.Dissolve_management(inFeature, outFeature,
                          dissolveFields, "")
    else:
        statistics_fields= arcpy.ValueTable(2)
        statistics_fields.addRow(sumField+" "+summode)
        statistics_fields.addRow(sumField+" Count") #加统计个数
        arcpy.Dissolve_management(inFeature, outFeature,
                          dissolveFields, statistics_fields)


def Main():
    DissolveVt()

inFeature  = arcpy.GetParameterAsText(0)
groupField  = arcpy.GetParameterAsText(1)
sumField  = arcpy.GetParameterAsText(2)
summode  = arcpy.GetParameterAsText(3)
outFeature=arcpy.GetParameterAsText(4)

Main()

9.6.3 创建tin

#coding=utf8
import arcpy

import os
import sys
import math

def getValueTable(vt):
    arcpy.AddMessage("columnCount={}".format(vt.columnCount))
    arcpy.AddMessage("rowCount={}".format(vt.rowCount))
    arcpy.AddMessage("exportToString={}".format(vt.exportToString()))
    rowCount=vt.rowCount
    columnCount=vt.columnCount
    for i in range(rowCount):
        for j in range(columnCount):
            arcpy.AddMessage("row={0},col={1},value={2}".format(i,j,vt.getValue(i,j)))
            arcpy.AddMessage("row={0},col={1},Truevalue={2}".format(i,j,vt.getTrueValue(i,j)))
def CreateTin():

    inValTab= arcpy.ValueTable(4)
    inValTab.addRow("{0} {1} {2} {3}".format(dgxFeature,gcField,"Hard_Line","<None>"))

    if fwFeature!="":
        inValTab.addRow("{0} {1} {2} {3}".format(fwFeature,"<None>","Soft_Clip","<None>"))

    arcpy.ddd.CreateTin(outtin, sr, inValTab)

def Main():
    CreateTin()

dgxFeature  = arcpy.GetParameterAsText(0)
gcField  = arcpy.GetParameterAsText(1)
fwFeature=arcpy.GetParameterAsText(2)
outtin=arcpy.GetParameterAsText(3)
sr=arcpy.Describe(dgxFeature).spatialReference
arcpy.CheckOutExtension("3D")
Main()
arcpy.CheckInExtension("3D")
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原文地址：https://www.cnblogs.com/gisoracle/p/13579731.html