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Skriptování v Python - úvod

• What is Python?
• What is Python Window?
• Quick tour of Python
• Writing Python scripts
• Getting started with Python in ArcGIS 10
• What is ArcPy?

Data pro 4. skript

Ukázka skriptů Python (ArcGIS 10)

1 (verze ArcGIS 10)

import arcpy     #import modulu
arcpy.env.overwiteOutput = True
arcpy.env.workspace = "d:/jirka/skola/vyuka/gis/model/"     #nastaveni workspace - pracovni adresar nebo geodatabaze
 
try:
   data = arcpy.Describe("obce.shp")   
   i = 0
   while (data.fields[i].name):
      print data.fields[i].name
      i += 1
except:
   print arcpy.GetMessages()

2 (verze ArcGIS 10)

import arcpy     #import modulu
arcpy.env.overwiteOutput = True
arcpy.env.workspace = "d:/jirka/skola/vyuka/gis/model/"     #nastaveni workspace - pracovni adresar nebo geodatabaze
 
try:
  rows = arcpy.SearchCursor("obce.shp", '"NAZEV" = \'Liberec\'')   #vytvori cursor
  for row in rows:
     pocet = row.OB01     #pocet obyvatel zadane obce
  radky = arcpy.SearchCursor("obce.shp")
  for radek in radky:
      if (radek.OB01 > pocet):
         print "%s - %i" %(radek.NAZEV, radek.OB01)
except:
   print arcpy.GetMessages()

4 (verze ArcGIS 10)

import arcpy     #import modulu
arcpy.env.overwiteOutput = True
arcpy.env.workspace = "d:/jirka/skola/vyuka/gis/model/"     #nastaveni workspace - pracovni adresar nebo geodatabaze
 
kraje = "D:\\jirka\\skola\\vyuka\\gis\\model\\kraje.shp"
 
rows = arcpy.SearchCursor("kraje.shp")   #vytvori cursor
for row in rows:
      nazev = row.NAZEV_ENG 
      kraje_Select_shp = "D:\\jirka\\skola\\vyuka\\gis\\model\\"+nazev+".shp"
      arcpy.Select_analysis(kraje, kraje_Select_shp, "\"NAZEV_ENG\" = '"+nazev+"'")

6 (ArcGIS 10)

import arcpy     #import modulu
arcpy.env.overwiteOutput = True
arcpy.env.workspace = "d:/gis1/obce"     #nastaveni workspace - pracovni adresar nebo geodatabaze
 
try:
   data = arcpy.Describe("obce.shp")
   shapename = data.ShapeFieldName
   rows = arcpy.SearchCursor("obce.shp", '"NAZEV" = \'Lhota\'')
   for row in rows:
       prvek = row.getValue(shapename)
       print "Prvek %s: " % row.NAZEV
       partnum = 0
       for part in prvek:
           print "Part %i: " % partnum
           for bod in prvek.getPart(partnum):
               print bod.X, bod.Y
           partnum += 1  
except:
   print arcpy.GetMessages()

Ukázka skriptů Python (ArcGIS 9)

1 (verze ArcGIS 9)

import arcgisscripting     #import modulu
gp = arcgisscripting.create()   #vytvoreni objektu geoprocessingu
gp.Overwriteoutput = True          #nastaveno prepisovani
gp.workspace = "d:/jirka/skola/vyuka/gis/model/"     #nastaveni workspace - pracovni adresar nebo geodatabaze
 
try:
   data = gp.Describe("obce.shp")   
   fields = data.Fields
   field = fields.next()
   while field:
      print field.Name
      field = fields.next()
except:
   print gp.GetMessages()

2 (verze ArcGIS 9)

import arcgisscripting, sys     #import modulu
gp = arcgisscripting.create()   #vytvoreni objektu geoprocessingu
gp.Overwriteoutput = 1          #nastaveno prepisovani
gp.workspace = "d:/jirka/skola/vyuka/gis/model/"     #nastaveni workspace - pracovni adresar nebo geodatabaze
 
try:
  input = "Liberec"     #String - nazev obce
  rows = gp.SearchCursor("obce.shp")   #vytvori cursor
  row = rows.next()       #promena row obsahuje jeden zaznam ze shapefilu
  while row:
      if row.GetValue("NAZEV") == input:
          pocet = row.GetValue("OB01")     #pocet obyvatel zadane obce
      row = rows.next()
  radky = gp.SearchCursor("obce.shp")
  rad = radky.next()
  while rad:
      if rad.GetValue("OB01") > pocet:
         print rad.GetValue("NAZEV"), rad.GetValue("OB01")
      rad = radky.next()
except:
  print gp.GetMessages()

3 (ArcGIS 9)

import arcgisscripting, sys     #import modulu
gp = arcgisscripting.create()   #vytvoreni objektu geoprocessingu
gp.Overwriteoutput = 1          #nastaveno prepisovani
gp.workspace = "d:/jirka/skola/vyuka/gis/model/"     #nastaveni workspace - pracovni adresar nebo geodatabaze
try:
  input = sys.argv[1]     #String - nazev obce
  output = sys.argv[2]    #cesta k textovemu souboru
  f = open(output, 'w')   #otevru file
  rows = gp.SearchCursor("obce.shp")   #vytvori cursor
  row = rows.next()       #promena row obsahuje jeden zaznam ze shapefilu
  while row:
      if row.GetValue("NAZEV") == input:
          pocet = row.GetValue("OB01")     #pocet obyvatel zadane obce
      row = rows.next()
  radky = gp.SearchCursor("obce.shp")
  rad = radky.next()
  while rad:
      if rad.GetValue("OB01") > pocet:
          f.write(rad.GetValue("NAZEV")+" "+str(rad.GetValue("OB01"))+"\n")    #do souboru pisu obce ktere maji vic obyvatel nez zadana
      rad = radky.next()
  f.close()
except:
  print gp.GetMessages()

4 (verze ArcGIS 9)

import sys, string, os, arcgisscripting

gp = arcgisscripting.create()
gp.workspace = "d:/jirka/skola/vyuka/gis/"     

kraje = "D:\\jirka\\skola\\vyuka\\gis\\kraje.shp"

rows = gp.SearchCursor("kraje.shp")   #vytvori cursor
row = rows.next()       #promena row obsahuje jeden zaznam ze shapefilu
while row:
      nazev = row.GetValue("NAZEV_ENG") 
      kraje_Select_shp = "D:\\jirka\\skola\\vyuka\\gis\\"+nazev+".shp"
      gp.Select_analysis(kraje, kraje_Select_shp, "\"NAZEV_ENG\" = '"+nazev+"'")
      row = rows.next()

5 (ArcGIS 9)

import arcgisscripting, sys
gp = arcgisscripting.create()
gp.Overwriteoutput = 1 
gp.workspace = "i:/pracovni/cajthaml/"  

try:
    input = sys.argv[1] # vstup
    mezi = sys.argv[2]  # mezivysledek po dissolve
    dis = sys.argv[3]   # nazev atributu pro dissolve

    gp.Dissolve_management (input, mezi, dis) 

    radky = gp.SearchCursor(mezi)
    rad = radky.next()

    while rad:
        nazev = rad.GetValue(dis)
        vystup = nazev+".shp"
        gp.Select_analysis (mezi, vystup, "\""+dis+"\" = '"+nazev+"'")  # vytvori samostane shapefily pro dissolvovane prvky
        rad = radky.next()

except:
  print gp.GetMessages()

7 (kód v rámci Field Calculatoru)

def pocet(jmeno):
   delka=jmeno.count(' ')+1
   return delka

slov=pocet(!NAZEV!)

8 (kód v rámci Field Calculatoru)

def posun(geometrie):
	point = geometrie.getPart(0)
	point.X = point.X - 2000
	return point

Shape=posun(!Shape!)