Python And GIS - Beyond Modelbuilder And Pythonwin
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The document discusses using Python for GIS tasks beyond ESRI's ModelBuilder. It covers Python lists, code examples accessing databases and downloading files, using third-party modules, text editors and IDEs for Python development, and references for further learning about Python and GIS. The presentation and code discussed are available online.
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![>>> Love the list > List: Array of object references - Huh? or Ordered collection of arbitrary objects list1 = [0,1,2,3] list2 = ['zero','one','two','three'] list3 = [0,'zero',1,'one',2,'two',3,'three'] > Ordered list2.sort() list2.sort(reverse=True) ['one','three',...] ['zero','two',...] > Mutable list1.append(4) list1.reverse() [0,1,2,3,4] [4,3,2,1,0]](https://image.slidesharecdn.com/pythonandgisbeyondmodelbuilderandpythonwin-1225719286857699-8/85/Python-And-GIS-Beyond-Modelbuilder-And-Pythonwin-3-320.jpg)
![>>> Keep lovin' the list > Iterable for l in list3 0 zero ... > Membership 3 in list3 --> True > Nestable - 2D array/matrix list4 = [[0,1,2], [3,4,5], [6,7,8]] > Access by index - zero-based list4[1] list4[1][2] [3,4,5] 5](https://image.slidesharecdn.com/pythonandgisbeyondmodelbuilderandpythonwin-1225719286857699-8/85/Python-And-GIS-Beyond-Modelbuilder-And-Pythonwin-4-320.jpg)
![>>> Process a text file 1 import csv, arcgisscripting 2 gp = arcgisscripting.create() 3 rows = gp.InsertCursor('C:/database.gdb/table') 4 fields = ['slat','slon','spud'] 5 reader = csv.reader(open('C:/file.csv','rb')) 6 for line in reader: 7 t = 0 8 row = rows.NewRow() 9 for field in fields: 10 row.SetValue(field,line[t]) 11 t = t + 1 12 rows.InsertRow(row) CSV GDB table](https://image.slidesharecdn.com/pythonandgisbeyondmodelbuilderandpythonwin-1225719286857699-8/85/Python-And-GIS-Beyond-Modelbuilder-And-Pythonwin-5-320.jpg)
![>>> Databases: MS SqlServer 1 import ceODBC 2 db = ceODBC.connect('DSN=Wells') 3 c = db.cursor() 4 c.execute('SELECT wellname, slat, slon \ 5 FROM wells WHERE wellid IN (1,2,3)') 6 for each in c.fetchall(): 7 print each [('DOE #1-18', 33.095599, -92.38563), ('SMITH #2-7', 35.10155, -91.48824), ('JOHN #11-13', 34.09130, -93.45256)]](https://image.slidesharecdn.com/pythonandgisbeyondmodelbuilderandpythonwin-1225719286857699-8/85/Python-And-GIS-Beyond-Modelbuilder-And-Pythonwin-6-320.jpg)
![>>> Databases: IBM DB2 1 import ceODBC 2 db = ceODBC.connect('DSN=dsn;UID=uid;PWD=pwd') 3 c = db.cursor() 4 c.execute('SELECT wellname FROM wells') 5 for each in c.fetchmany(3): 6 print each [('DOE #1-18', 33.095599, -92.38563), ('SMITH #2-7', 35.10155, -91.48824), ('JOHN #11-13', 34.09130, -93.45256)]](https://image.slidesharecdn.com/pythonandgisbeyondmodelbuilderandpythonwin-1225719286857699-8/85/Python-And-GIS-Beyond-Modelbuilder-And-Pythonwin-7-320.jpg)
![>>> Download files 1 import os, shutil 2 wgetDir = 'C:/Program Files/wget/o' 3 quads = 4 [['36094a1','ELKINS','ar'],['36094a2','FAYETTEVILLE','ar']] 5 exts = ['tif', 'tfw', 'fgd'] 6 url = 'http://www.archive.org/download/' 7 home = 'C:/temp/quads/' 8 for quad in quads: 9 for ext in exts: 10 fullurl = url + 'usgs_drg_' + quad[2] + \ 11 '_' + quad[0][:5] + '_' + quad[0][5:] + \ 12 '/o' + quad[0] + '.' + ext 13 os.system('wget %s -o log.log' % (fullurl)) 14 # Move and rename --> AR_ELKINS_o35094h3.tif 15 shutil.move(wgetDir + quad[0] + '.' + ext, 16 home + quad[2].upper() + '_' + \ 17 quad[1].replace(' ','_') + \ 18 '_' + 'o' + quad[0] + '.' + ext)](https://image.slidesharecdn.com/pythonandgisbeyondmodelbuilderandpythonwin-1225719286857699-8/85/Python-And-GIS-Beyond-Modelbuilder-And-Pythonwin-10-320.jpg)
![>>> DB records --> FC 1 connect(dsn) 2 db.cursor() 3 execute(sql) 4 results = fetchall() 5 fields = [f1,f2,...] 6 rows = InsertCursor(table) 7 for r in results: 8 row = rows.NewRow() 9 row.SetValue(fields[i], r[i] 10 ... 11 if point data: 12 MakeXyEventLayer(table,x,y,layer) 13 CopyFeatures(layer,featureclass) 14 else: 15 AddJoin(layer,layerfield,table,tablefield) 16 CopyFeatures(layer,featureclass)](https://image.slidesharecdn.com/pythonandgisbeyondmodelbuilderandpythonwin-1225719286857699-8/85/Python-And-GIS-Beyond-Modelbuilder-And-Pythonwin-11-320.jpg)
![[email_address] Presentation and code available at: http://code.google.com/p/csvimporter ?](https://image.slidesharecdn.com/pythonandgisbeyondmodelbuilderandpythonwin-1225719286857699-8/85/Python-And-GIS-Beyond-Modelbuilder-And-Pythonwin-19-320.jpg)
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- 1. >>> Python and GIS: … Beyond ModelBuilder … and PythonWin Chad Cooper Southwestern Energy Company
- 2. >>> What we'll cover > Lists, lists, lists > Code examples > 3 rd party modules > Editors/IDEs > Python references > This presentation/code online! Code in orange Pseudocode in blue Output/results in green
- 3. >>> Love the list > List: Array of object references - Huh? or Ordered collection of arbitrary objects list1 = [0,1,2,3] list2 = ['zero','one','two','three'] list3 = [0,'zero',1,'one',2,'two',3,'three'] > Ordered list2.sort() list2.sort(reverse=True) ['one','three',...] ['zero','two',...] > Mutable list1.append(4) list1.reverse() [0,1,2,3,4] [4,3,2,1,0]
- 4. >>> Keep lovin' the list > Iterable for l in list3 0 zero ... > Membership 3 in list3 --> True > Nestable - 2D array/matrix list4 = [[0,1,2], [3,4,5], [6,7,8]] > Access by index - zero-based list4[1] list4[1][2] [3,4,5] 5
- 5. >>> Process a text file 1 import csv, arcgisscripting 2 gp = arcgisscripting.create() 3 rows = gp.InsertCursor('C:/database.gdb/table') 4 fields = ['slat','slon','spud'] 5 reader = csv.reader(open('C:/file.csv','rb')) 6 for line in reader: 7 t = 0 8 row = rows.NewRow() 9 for field in fields: 10 row.SetValue(field,line[t]) 11 t = t + 1 12 rows.InsertRow(row) CSV GDB table
- 6. >>> Databases: MS SqlServer 1 import ceODBC 2 db = ceODBC.connect('DSN=Wells') 3 c = db.cursor() 4 c.execute('SELECT wellname, slat, slon \ 5 FROM wells WHERE wellid IN (1,2,3)') 6 for each in c.fetchall(): 7 print each [('DOE #1-18', 33.095599, -92.38563), ('SMITH #2-7', 35.10155, -91.48824), ('JOHN #11-13', 34.09130, -93.45256)]
- 7. >>> Databases: IBM DB2 1 import ceODBC 2 db = ceODBC.connect('DSN=dsn;UID=uid;PWD=pwd') 3 c = db.cursor() 4 c.execute('SELECT wellname FROM wells') 5 for each in c.fetchmany(3): 6 print each [('DOE #1-18', 33.095599, -92.38563), ('SMITH #2-7', 35.10155, -91.48824), ('JOHN #11-13', 34.09130, -93.45256)]
- 8. >>> Sending email 1 import smtplib 2 server = smtplib.SMTP(email_server_ip) 3 msg = 'Eat more spam and eggs!' 4 server.sendmail('[email protected]', 5 '[email protected]', 6 msg) 7 server.quit() > Make sure port 25 is unblocked!
- 9. >>> Download files > GNU wget - free CLI program > Retrieve using HTTP protocol > Build a URL such as: 'http://www.archive.org/download/ usgs_drg_ar_36094_a1/ o36094a1.tif' > Pass URL to wget, it fetches
- 10. >>> Download files 1 import os, shutil 2 wgetDir = 'C:/Program Files/wget/o' 3 quads = 4 [['36094a1','ELKINS','ar'],['36094a2','FAYETTEVILLE','ar']] 5 exts = ['tif', 'tfw', 'fgd'] 6 url = 'http://www.archive.org/download/' 7 home = 'C:/temp/quads/' 8 for quad in quads: 9 for ext in exts: 10 fullurl = url + 'usgs_drg_' + quad[2] + \ 11 '_' + quad[0][:5] + '_' + quad[0][5:] + \ 12 '/o' + quad[0] + '.' + ext 13 os.system('wget %s -o log.log' % (fullurl)) 14 # Move and rename --> AR_ELKINS_o35094h3.tif 15 shutil.move(wgetDir + quad[0] + '.' + ext, 16 home + quad[2].upper() + '_' + \ 17 quad[1].replace(' ','_') + \ 18 '_' + 'o' + quad[0] + '.' + ext)
- 11. >>> DB records --> FC 1 connect(dsn) 2 db.cursor() 3 execute(sql) 4 results = fetchall() 5 fields = [f1,f2,...] 6 rows = InsertCursor(table) 7 for r in results: 8 row = rows.NewRow() 9 row.SetValue(fields[i], r[i] 10 ... 11 if point data: 12 MakeXyEventLayer(table,x,y,layer) 13 CopyFeatures(layer,featureclass) 14 else: 15 AddJoin(layer,layerfield,table,tablefield) 16 CopyFeatures(layer,featureclass)
- 12. >>> 3 rd party modules > pyExcelerator, xlrd - Excel > ceODBC, MySQLdb - databases > mxDateTime - date/time f(x)s > csv* - read/write csv files > geopy - geocode using 3 rd party geocoders (Google, Yahoo, VE) > For fun: gdata (Google API), Flickr, digital photos (EXIF) * in standard library
- 13. >>> Editors - Notepad > Basic - you write code, save
- 14. >>> Editors - Notepad2 > Line numbering, syntax coloring
- 15. >>> IDEs - SPE > IDE: Integrated development environment > Tools > Debugger > Shell
- 16. >>> IDEs - IDLE > Ships with CPython distro
- 17. >>> Good references > http://www.python.org/doc > Module reference > Google group: comp.lang.python > Books: > Python Cookbook (recipes online) > How to Think Like a Computer Scientist (online) > ESRI gp scripting forum
- 18. >>> Further reading > Python Magazine - online print and pdf (for fee) > The Python Papers - pdf free online > Dive Into Python - free online
- 19. [email_address] Presentation and code available at: http://code.google.com/p/csvimporter ?