Attribute Extraction

Attribute query extraction You have tracts for an entire state, but want tracts for one county only

Attribute query extraction Select tracts by County FIPS or ANSI ID Cook County = 031

Attribute query extraction Cook County tracts are selected Export to new feature class or shapefile

Export selected features

Add new layer Cook County tracts

Select by Location

Select By Location City of Pittsburgh tracts within municipality

Select by Location Select municipality of Pittsburgh first

Select by Location

Selected Features

Other Proximity Queries

Points Near Polygons Schools near parks

Points Near Polygons View schools in attribute table

Points Near Points Schools are near convenient stores Schools within 300 feet of a convenience store

Polygons Intersecting Lines Neighborhoods that Intersect Streets Transportation planner wants to know what neighborhoods are affected by construction project on major road

Lines Intersecting Polygons Streets or sidewalks that intersect floodplains Public works officials need to know what streets might flood

Polygons Intersecting Polygons Buildings completely within zoning area City planners want to know what buildings are completely within a zoning area

Clipping Features

ArcToolbox

Clip Acts like a “cookie cutter” to create a subset of features. Clip features (Central Business District) Output features (CBD streets) Input features (streets)

Clip vs Select By Location Clean edges Looks good Select by Location Dangling edges Better for geocoding

Clip vs Select by Location Penn Avenue – ranging from street segment 1000-1098

Dissolving Features

ArcToolbox

Dissolve Create regions using U.S. States Use SUB_REGION field to dissolve Sum population

Dissolve Results States dissolved to form regions Population summed for each region

Appending Features

ArcToolbox

Append Appends one or more data sets into an existing data set features must be of the same type input datasets may overlap one another and/or the target dataset TEST option: field definitions of the feature classes must be the same and in the same order for all appended features NO TEST option: Input features schemas do not have to match the target feature classes's schema

Append DuPage and Cook County are combining public works and need a new single street centerline file

Append Append will add DuPage streets to Cook County Streets

Resultant Layer One street layer (Cook County) with all records and field items

Merging Features

ArcToolbox

Merge Combines multiple input datasets of the same data type into a single, new output dataset

Resultant Layer New merged voting district layer

Union Features

ArcToolbox

Union Overlays two polygon layers resulting output layer has combined attribute data of the two inputs contains all the polygons from the inputs, whether or not they overlap

Union Neighborhoods and zip codes

Union Better describes characteristics of a neighborhood. Central business district 15222 vs 15219

Union Attributes tables contain different fields and data

Union Results New polygons with combined data

Intersecting Features

ArcToolbox

Intersect Floodzones and buildings City manager needs to know what buildings intersect flood zones and wants the flood data attached to each intersecting building

Intersect Result Only building polygons that intersect flood zones with combined data fields

Model Builder

Model Builder Workflow processes can be complicated Automates and strings functions together Copyright – Kristen S. Kurland, Carnegie Mellon University

Model Builder Problem: You have census tracts from a state with population data but only want population for neighborhoods in a small region Solution: Use Model Builder functions to clip census tracts and union to aggregate data to neighborhoods Copyright – Kristen S. Kurland, Carnegie Mellon University

Model Builder Example Begin with census tracts for the state of Pennsylvania Copyright – Kristen S. Kurland, Carnegie Mellon University

Model Builder Example Clip only tracts whose centers are located within Pittsburgh neighborhoods Union the census tracts and neighborhoods Copyright – Kristen S. Kurland, Carnegie Mellon University

Model Builder Example Run the model… Copyright – Kristen S. Kurland, Carnegie Mellon University

Model Builder Example Display and query the results Copyright – Kristen S. Kurland, Carnegie Mellon University