Key Terms. Attribute join Target table Join table Spatial join

Transcription

1 Key Terms Attribute join Target table Join table Spatial join

2 Lect 10A Building Geodatabase Create a new file geodatabase Map x,y data Convert shape files to geodatabase feature classes

3 Spatial Data Formats Coverage Shape file Geodatabase: personal, file, enterprise (SDE)

4 Shape File Multiple files, all with the same name but different file extensions No intermediate data products, but has indices to speed data processing Widely used to share spatial data files

5 Geodatabase A geodatabase is a container used to hold a collection of datasets (GIS features, tables, raster images, and other objects)

6 Geodatabase Storage model based on a series of simple yet essential relational database concepts and leverages the strengths of the underlying database management system (DBMS). Simple tables and well-defined attribute types are used to store the schema, rule, base, and spatial attribute data for each geographic dataset. Provides a formal model for storing and working with your data. Through this approach, structured query language (SQL) a series of relational functions and operators can be used to create, modify, and query tables and their data elements.

7 Geodatabase A feature class is stored as a table, often referred to as the base or business table. Each row in the table represents one feature. The shape column stores the polygon geometry for each feature. The contents of this table, including the shape when stored as a SQL spatial type, can be accessed through SQL.

8 Enterprise Geodatabase Practically unlimited size and multiple simultaneous users Use enterprise data management systems Store spatial datasets in a number of DBMSs: IBM DB2, Microsoft SQL Server, Oracle, or Postgres

9 Personal Geodatabase Parallels enterprise geodatabase but on PC Stores datasets in a Microsoft Access.mdb file Limited to 2GB Much overhead in space and extra structure Tempting to apply one s own Access skills, but needs ArcGIS Catalog utility for manipulation

10 File Geodatabase Esri s replacement for shapefiles Vector and raster map layers Other objects (tables) Stores one or more datasets in a folder of files with.gdb extension Can be up to 1 TB in size Can be used across platforms Can be compressed and encrypted for read-only, secure use

11 X, Y Data Point data table with X and Y attributes Increasingly popular to include X and Y with data Commonly used for GPS data

12 Lecture 10B Geocoding Create and manage address locator Match addresses

13 Lecture 10B Geocoding Definition: the process of creating map features from addresses Three components: Data table (addresses) Reference data Address locator

14 Create Address Locator ArcCatalog 14

15 Choose Address Locator Style Skeleton of the address locator Based on data tables and reference layer

16 Address Locator Styles Styles Reference dataset geometry Reference dataset representation Address search parameters Example Applications US Address Dual Ranges Lines Address range for both sides of street segment All address elements in a single field 320 Madison St. N2W1700 County Rd Union St. Finding a house on a specific side of the street US Address Single House Points or polygons Each feature represents an address All address elements in a single field 71 Cherry Ln. W1700 Rock Rd Carson Rd. Finding parcels, buildings, or address points

17 Streets, ZIP Codes Choose Reference Layer 17

18 ArcGIS Locator Parameters

19 Geocode in ArcMap Add tabular data and streets layer Add address locator Geocode addresses View geocoding results Interactively rematch addresses

20 Address Rematching Investigate unmatched addresses. Generally requires expertise and knowledge of local streets Compare a street name in the attributes of the streets table and the address table.