1/29 Former leader of the “free” world … “I know what I believe. I will continue to...

1/29

Former leader of the “free” world …

http://www.dubyaspeak.com

“I know what I believe. I will continue to articulate what I believe and what I believe – I believe what I believe is right.”

“Science is not an art – I mean, reading is not an art. It's a science.”

“If a person doesn't have the capacity that we all want that person to have, I suspect hope is in the far distant future, if at all.”

“Rarely is the question asked: Is our children learning?”

“We spent a lot of time talking about Africa, and we should. Africa is a nation that suffers from incredible disease.”

“Our nation must come together to unite.”

“I know the human being and fish can coexist peacefully”

G. Dubya Bush

2/29

Satellite tracking systems

http://www.orbcomm.com

3/29

arcpy.*Cursor functions

4/29

SearchCursor Syntax

5/29

SearchCursor Example

6/29

Update Cursor Syntax

7/29

Update cursor example

8/29

Insert/Update and Locked data

Can not Insert/Update if data is lockedFeature class or table can be locked if it is:

Part of a map in an MXD that is open in ArcMapPart of a workspace being viewed by ArcCatalog

Best practices include:Exit ArcGIS applications when running scripts that create or modify tables or feature classesDelete cursor objects when you have finished using them …

9/29

Insert Cursor Syntax

10/29

InsertCursor Example

11/29

The Data Access (da) module

arcpy.da.Walk( ) – an ArcGIS-aware version of os.path.walk ( )

New to 10.1 with faster cursors

12/29

SearchCursor Function and Classarcpy Function

arcpy.da Class

13/29

SearchCursor Function and Class Example

68 sec for Function

0.66 sec for Class

~100 times faster in this example.

14/29

The Geometry Class

15/29

Geometry Properties

16/29

Geometry Methods

… and clipcontainsconvexHullcrossesdifferencedisjointdistanceToequalsgetAreagetLengthgetPartintersectoverlapspositionAlongLineprojectAssymmetricDifferencetouchesunionwithin

17/29

Reading geometries

18/29

Writing geometries using Python

Polylines by example …

19/29

Writing geometries using Python

For Update/InsertCursor objects, test your scripts on a copy of the dataset. It is sometimes hard to undo modifications to data!

Input file structure:

20/29

Spatial reference and cursors

21/29

Creating a spatial reference

22/29

Point and PointGeometry Classes

23/29

PointGeometry Class

24/29

Array Class

25/29

Licensing and Installation

26/29

Licensing and Installation

Check to see if a license is available

Returns license to license manager

Check out license from license manager

See if requested product is available

Information about installation

Install types that used with GetInstallInfo

Current product license

Legacy … replaced by

27/29