1. Lab 10: Spatial Queries You have been asked to determine what census tract that each parcel Property is contained. How will you find the tract number for each parcel property & display on a map using MapInfo? In this lesson, you will learn how to ask questions/ query multiple data layers when the only relationship between the layers is spatial. You will learn what spatial operators : within, contain, intersect You will also learn what a buffer is, how to create and how to use the spatial operators with a buffer.

2. To create a Spatial SQL to answer: Which parcels are within contaminated soil? Spatial SQL in MapInfo Select File> Open Table Select parcel & contaminated soil table. Then: 1 Select Query 2 Select SQL Select 1 2 (Continued on next slide)

3. Continued- Spatial SQL-Which parcels are within contaminated soil? Answer is parcels shaded orange 2 Select the tables using tables button 3 Move cursor to where condition box, select columns button- select file. Obj Select Operators button- select within Select columns button- select file.obj 4 Select Verify 5 Select OK 2 2 3 3 3 4 5

4. Which parcels are intersect contaminated soil? Spatial SQL

5. The order of tables can change the spatial SQL result. If contaminated soil table listed first, it is the base table & the output of the SQL is one contaminated soil record (polygon). If parcel table listed first, it is the base table & the output of the SQL is many parcel records (polygons) Spatial SQL

6. Example: Buffering selected polygons at a constant distance in MapInfo & having the buffer result in one buffer for each object: Select File>Open Table select table to buffer; In layer control- 1 make the cosmetic layer be Editable 2 Select OK Buffer result (3 buffer polygons) 3 Select objects to buffer on map using arrow select 3 3 3 4 Select Objects 5 Select Buffer 6 Type Radius value & select units feet or miles select smoothness value select 1 buffer or multiple 7 Select OK 1 2 4 5 6 7

7. Example: Buffering selected polygons at a constant distance in MapInfo & having the buffer result in one buffer of all objects Buffer result (1 buffer polygon)

8. You are now ready to begin MapInfo Exercise- Lab 10 Spatial Queries. The main objectives are: To ask questions or query data layers using: Query> SQL Select Menu using operators of within, contain, & intersect To create a buffer and using spatial operators, determine if features from one layer are within or intersect features from another layer Begin exercise- lab 10