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GIS 1 GIS Lecture 8 Spatial Data Processing. GIS 2 Outline Extracting Features by Attributes Location Proximities Geoprocessing Tools Model Builder.

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Presentation on theme: "GIS 1 GIS Lecture 8 Spatial Data Processing. GIS 2 Outline Extracting Features by Attributes Location Proximities Geoprocessing Tools Model Builder."— Presentation transcript:

1 GIS 1 GIS Lecture 8 Spatial Data Processing

2 GIS 2 Outline Extracting Features by Attributes Location Proximities Geoprocessing Tools Model Builder

3 GIS 3 Extracting Features

4 GIS 4 Attribute Query Extraction You have tracts for state but want one county only

5 GIS 5 Attribute Query Extraction Select tracts by County ID

6 GIS 6 Export Selected Features Right-click to export selected features

7 GIS 7 Add Exported Layer

8 GIS 8 Location Proximities

9 GIS 9 Select by Location Identify spatial relationships between layers Finds features that are within another layer. Input: County Census Tracts Can’t use Select By Attributes Output: City tracts only

10 GIS 10 Select by Location Select feature to extract tracts to (city outline)

11 GIS 11 Select by Location Selection, Select By Location

12 GIS 12 Export Selection and Add Layer

13 GIS 13 Other Select by Location Queries Toxic release sites within 1 mile of a river

14 GIS 14 Other Select by Location Queries Points near points Schools within ½ mile of polluting companies

15 GIS 15 Other Select by Location Queries Polygons intersecting lines Municipalities that intersect Interstates

16 GIS 16 Other Select by Location Queries Lines intersecting polygons

17 GIS 17 Other Select by Location Queries Buildings whose centers are in emergency zones

18 GIS 18 Geoprocessing Tools Overview Clipping Features

19 GIS 19 Geoprocessing Tools GIS Operation to manipulate data Typically take input data sets, manipulate, and produce output data sets Often use multiple data sets

20 GIS 20 Geoprocessing Tools Clip Dissolve Intersect Union Append

21 GIS 21 Clipping Features

22 GIS 22 Clip “Cookie cutter” to select features =

23 GIS 23 Clipping Features (Points, Lines, Polygons) X YZ = = =

24 GIS 24 Line (Arc) Clipping Input layer - Streets Clip layer – Central Business District (selected) Output layer - Streets within Central Business District

25 GIS 25 Clip Geoprocessing Tool

26 GIS 26 Difference Between Clipping and Select by Location Clip: Clean “cut” Select by Location: Dangle edges

27 GIS 27 Dissolving Features

28 GIS 28 Dissolve Aggregates items that have the same value #Item 1 C 2 R 3C 4 I

29 GIS 29 Dissolve Example You have states but need regions

30 GIS 30 Dissolve Functions ArcToolBox or Command Line Window

31 GIS 31 Dissolve Field Field with a common value for each feature (e.g. Sub_Region)

32 GIS 32 Statistics Field Aggregated field can be summarized using a statistics type (i.e. state population can be aggregated by population for each region)

33 GIS 33 Resultant Dissolved Regions Layer

34 GIS 34 Appending Features

35 GIS 35 Append Appends features together

36 GIS 36 Append Streets Separate street layers for neighborhoods

37 GIS 37 Append Streets Choose both street layers to append

38 GIS 38 Resultant Layer One street layer with all records and field items

39 GIS 39 Union Features

40 GIS 40 Union Use Union when you want to overlay two polygon layers so that the resulting output layer a) has the combined attribute data of the polygons in the two inputs, and b) contains all the polygons from the inputs, whether or not they overlap.

41 GIS 41 Union Start with Pittsburgh ZIP codes and Neighborhoods

42 GIS 42 Union Attributes tables contain different data

43 GIS 43 Union Union neighborhoods and ZIP Codes to include the zip on each neighborhood polygon

44 GIS 44 Union Result: Polygons are unioned with same information Tips: Same Projections, Order of Layers

45 GIS 45 Intersecting Features

46 GIS 46 Intersect Use Intersect when you want to overlay a layer with the polygons in another layer so that the resulting output layer - has the combined attribute data of the features in the two inputs, and - only contains features that fall within the spatial extent of the overlay polygons

47 GIS 47 Intersect Flood zones that intersect buildings

48 GIS 48 Intersect Result is only building polygons that intersect floodzones with combined data fields

49 GIS 49 Model Builder

50 GIS 50 Model Builder Workflow processes can be complicated Automates and strings functions together

51 GIS 51 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

52 GIS 52 Model Builder Example Begin with census tracts for the state of Pennsylvania

53 GIS 53 Model Builder Example Clip only tracts whose centers are located within Pittsburgh neighborhoods Union the census tracts and neighborhoods

54 GIS 54 Model Builder Example Run the model…

55 GIS 55 Model Builder Example Display and query the results

56 GIS 56 Summary Extracting Features Attribute Queries Select by Location Converting Shapefiles Geoprocessing Tools Clip Dissolve Union Intersect Append Model Builder


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