model builder in arcgis

Model Builder in ArcGIS

By Ashok Peddi

What is ModelBuilder? What is a Model Builder? is an application in which you can create, edit, and modify models! “Model” is an ideal representation() (Ex. Role model) “Builder” building an ideal representation Why we need Model Builder? reduce the ambiguity and redundancy to increase one’s efficiency; Optimization Visual Programming!

Why Model Builder

• Developing a model for a GIS analysis allows for repeat testing of a hypothesis using different data.

• The model can be coded into a GIS application, so that the steps are performed automatically.

• Easier reproduction of results.• Simplification of workflow.• Informs the computer how to conduct a series of

steps that would be impractical for you to do manually.(TT process)

How ModelBuilder Works• Drag layers you want to

participate into the model• Drag tools you want to

use into the model• Output layers, tables,

objects shown in green• Connect the features

using arrows• Order matters to certain

tools (Clip)

Human inefficiency

• Physically cannot perform the steps as fast as Model Builder can produce the results.

• Certain steps, such as iteration through a feature set would be prohibitively time consuming.(perform the same steps)

• Minimize the amount of time spent

Efficient Workflow

There are many repetitive steps you will take in your daily workflow.

Streamlining the process saves you time.

Types of Model builders

Executing tools Model Builder often used method Simple & easyCreating tools with Model Builder Use of Elements, connectors and

Additional Functionality

• The Model can be expanded further, with more data and tools(Edit option).

• The Model can be exported into a scripting language, allowing for greater modeling capabilities.

• Python is the default (and recommended) scripting language for ModelBuilder

Creating a New Toolbox

• Creating your own Toolbox is not just for organizational purposes. It allows you to share your models with others.

• If you will be sharing your model and using relative addresses, you need to plan the folder location of your New Toolbox carefully.– Default location for a New Toolbox created inside Create

a new Toolbox by right clicking in ArcCatalog and selecting New Toolbox.

Model Builder Icon

Model Builder Window

Able to add any data* or any tool of Arc Tool box by clicking insert and Add Data or tool

* Any shape file/ Table

References

• http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//002w00000001000000