Model builder in_arcgis
- 1. Using Model Builder in ArcGIS Getinet Sintayehu Bahir Dar, sep, 20191
- 2. 2 What is ModelBuilder? • ModelBuilder is an application we use to create, edit and mange models • We create models in ArcGIS using ModelBuilder to automate process • It is a tool for building workflows / models that use sequence of geoprocessing tools • An automation tool… But comes with some startup overhead
- 3. Why Use Model Builder? • Most useful in two circumstances • Documents models & their parameterization • Allows experimentation with model parameters – particularly for “weighting and rating” • Basic idea is that of a “dependency diagram” • User specifies inputs, processing and outputs • If inputs change, system repeats intermediate operations as needed • Diagram has three kinds of elements • Inputs , Geoprocessing Operations and Outputs • Output from one operation can be used as input to an other, allowing “chaining 3
- 4. Model Benefits • Model Builder is a graphical interface that allows users to easily create models using existing tools and data • Models provide an easy way to interpret visual representation of the data and workflow useful in project documentation • Models can be reused and shared, and are easy to modify if necessary • Models are much more convenient than running many tools individually • Models are a series of geoprocessing tools that facilitate the automation of complex or repetitive tasks • Requires no programming experience
- 5. Tips • Working in the model builder application vs. using the model as a tool • Keep vs. delete intermediate data • Run vs. Run Entire Model • Iteration – added from Insert menu or set in the model properties • Add to Display • Export to script
- 6. Model Builder Setup • Rather obscure to start…implemented as a custom toolbox tool • Open toolbox panel • Create empty toolbox • Right mouse on Toolboxes, select New Toolbox • Create empty model • Right mouse on new Toolbox, select New Model • Then populate model by drag and drop • Of data layers from map table of contents • Of geoprocessing operations from the toolbox • Finally, wire data and processing boxes together 6
- 7. • Creating a new model: • Click the ModelBuilder button on the ArcMap Standard toolbar • This opens the ModelBuilder window for editing 7 the model is open for editing, you can add tools using the Search window; add data elements
- 8. • Adding tools and data to a model: • In ArcMap, click Geoprocessing > Search For Tools. • You can create any where, but first create toolbox 8
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- 10. Documentation • Documentation for a model can be viewed in the model dialog box, ArcCatalog, or Desktop Help • On the model context menu in ArcCatalog, choose Item Description…, then click the Edit icon to add information • Basic documentation (name, label and description) can also be added on the model properties dialog
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- 12. Add tool to the Model 12
- 13. 13 Add data to the model Right click on the Buffer tool Create input features (Make variable -> From Parameter -> Input features ) Input feature added Right click on the empty area Create variable Select the datatformat Input feature added
- 14. Run States 14 Not linked Linked Not Ready-To-Run Data provided Not Ready-To-Run Tool parameters defined Ready to run Add to display Tool already run
- 15. Validating the Model 15 Validate the model: data elements and parameter values are valid Data variables reference data on disk, not the actual data
- 17. • The first geoprocessing applies a new projection to an input feature class to create a new output feature class • The output feature, projected feature class, becomes input feature for the next geoprocessing (clip) 17 Output from one tool may be used as input to one or more other tools