Lab 6
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Lab 6 Querying Data Due Oct 22 This lab has two sections. Section 1 will deal with basic querying and Section 2 with joining and relating attribute tables. In Section 1 you will do exercises that correspond to Chapter 8 in the Getting to Know ArcGIS book and answer the additional bold faced questions as well as produce reports. Section 2 deals with relating and joining attributes tables. You are to do 9a and 9b exercises in Chapter 9 for this section along with making a map and turning it in. Section 1: Basic queries Perform exercises 8a, 8b and 8c from Chapter 8 in Getting to Know ArcGIS (GTKAG). Print out the report you produced from exercise 8c. Boolean operators: The boolean operators AND, OR and NOT are indispensable for extracting information from large databases. Basically, a boolean operator is used to apply criteria to a database, according to standard rules. In case you are unfamiliar with them, here is a brief explanation of how they work: AND Also known as "intersection", the boolean "AND" operator returns data which meet both of two criteria specified in the expression. For example the following expression is applied to the parcels theme from this chapter: (zip code 92373) AND (at least 3 bedrooms) The expression will return only those parcels which have a zip code of 92373 and also have a structure with 3 or more bedrooms. It will exclude a parcel which had 4 bedrooms but a different zip code or a parcel with zip code 92373 but with a structure with only 2 bedrooms. OR Also known as "union", the "OR" operator returns data that meet either of two criteria specified. For instance the following expression is applied to the parcels data set from this chapter: (zip code 92373) OR (at least 3 bedrooms) This would return not only all parcels in the database having structures with 3 or more bedrooms, but also all others having the zip code 92373, regardless of bedrooms NOT Called "exclusion", the NOT operator excludes all data meeting a certain criterion. The following example is applied to the same database:
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Lab GIS
Transcript of Lab 6
Lab 6 Querying Data Due Oct 22 This lab has two sections. Section 1 will deal with basic querying and Section 2 with joining and relating attribute tables. In Section 1 you will do exercises that correspond to Chapter 8 in the Getting to Know ArcGIS book and answer the additional bold faced questions as well as produce reports. Section 2 deals with relating and joining attributes tables. You are to do 9a and 9b exercises in Chapter 9 for this section along with making a map and turning it in. Section 1: Basic queries Perform exercises 8a, 8b and 8c from Chapter 8 in Getting to Know ArcGIS (GTKAG). Print out the report you produced from exercise 8c. Boolean operators: The boolean operators AND, OR and NOT are indispensable for extracting information from large databases. Basically, a boolean operator is used to apply criteria to a database, according to standard rules. In case you are unfamiliar with them, here is a brief explanation of how they work: AND -‐ Also known as "intersection", the boolean "AND" operator returns data which meet both of two criteria specified in the expression. For example the following expression is applied to the parcels theme from this chapter: (zip code 92373) AND (at least 3 bedrooms) The expression will return only those parcels which have a zip code of 92373 and also have a structure with 3 or more bedrooms. It will exclude a parcel which had 4 bedrooms but a different zip code or a parcel with zip code 92373 but with a structure with only 2 bedrooms. OR -‐ Also known as "union", the "OR" operator returns data that meet either of two criteria specified. For instance the following expression is applied to the parcels data set from this chapter: (zip code 92373) OR (at least 3 bedrooms) This would return not only all parcels in the database having structures with 3 or more bedrooms, but also all others having the zip code 92373, regardless of bedrooms NOT -‐ Called "exclusion", the NOT operator excludes all data meeting a certain criterion. The following example is applied to the same database:
(zip code 92373) NOT (at least 3 bedrooms) This expression returns all parcels having the zip code 92373 except those that have structures with 3 or more bedrooms.
1. How many, if any, parcels for sale in this database have structures with 3 or 4 bedrooms? Do any of these houses have pools? If there are any parcels for sale that meet these conditions, print out a report with their addresses, sale price, size, number of bedrooms and bathrooms.
Section 2: Joining and relating tables Perform exercises 9a and 9b from Chapter 9 in Getting to Know ArcGIS. 1. Explain difference between relating and joining tables. 2. How many different pits contained zinc as a toxic metal? 3. Make a map of the Louisiana showing the pits that contain zinc as a toxic metal.
