Gis tutorial 1
This presentation is the property of its rightful owner.
Sponsored Links
1 / 43

GIS Tutorial 1 PowerPoint PPT Presentation


  • 70 Views
  • Uploaded on
  • Presentation posted in: General

GIS Tutorial 1. Lecture 7 Geocoding. Outline. Geocoding overview Linear (street) geocoding Problems and solutions Street map sources Polygon geocoding Geocoding in ArcView Useful Web sites. Lecture 7. Geocoding overview. Geocoding.

Download Presentation

GIS Tutorial 1

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Gis tutorial 1

GIS Tutorial 1

Lecture 7

Geocoding


Outline

Outline

GIS TUTORIAL 1 - Basic Workbook

Geocoding overview

Linear (street) geocoding

Problems and solutions

Street map sources

Polygon geocoding

Geocoding in ArcView

Useful Web sites


Geocoding overview

Lecture 7

Geocoding overview

GIS TUTORIAL 1 - Basic Workbook


Geocoding

Geocoding

GIS TUTORIAL 1 - Basic Workbook

  • Process of creating geometric representations for locations (e.g., points) from descriptions of locations (e.g., street addresses)

  • Uses a computer program that employs code tables to standardize address components called a geocoding engine

  • Two ways to geocode

    • Batch geocoding—attempts to match all addresses

    • Interactive rematching—sophisticated user interface to match addresses


Geocoding examples

Geocoding examples

GIS TUTORIAL 1 - Basic Workbook

City’s economic development department maps technology businesses by street addresses to see technology-rich areas in a city

County health director maps personal care and nursing homes and compares them to elderly population by neighborhood

Business maps store locations and compares to competitor locations

Emergency dispatch operators geocode an address to determine who should respond to an emergency call

Others?


Geocoding files

Geocoding files

  • Tabular data (text or dbase)

    • Street addresses

    • ZIP codes

    • Latitude and longitude

GIS TUTORIAL 1 - Basic Workbook


Geocoding files1

Geocoding files

GIS TUTORIAL 1 - Basic Workbook

  • Geographic data

    • Street centerlines

    • ZIP code polygons


Other geocoding files

Other geocoding files

  • Lines

    • Railroads, rivers

  • Polylines

    • Parcels, census blocks, tracts, MCD/CCDs, places, counties, etc.

  • Points

    • Landmarks such as churches, schools, and other cultural features represented as TIGER as points

GIS TUTORIAL 1 - Basic Workbook


Linear street geocoding

Lecture 7

Linear (street) geocoding

GIS TUTORIAL 1 - Basic Workbook


Linear geocoding streets

Linear geocoding (streets)

  • Urban street maps

    • Four street address numbers ranging from low to high for each side of a street segment

198

100

Oak Street

199

101

GIS TUTORIAL 1 - Basic Workbook


Geocoding steps

Geocoding steps

Original address: 125 East Oak Street15213

Address parced: |125|East|Oak|Street|15213

Abbreviations standardized: |125|E|Oak|St|15213

Elements assigned to match keys:

[HN]:125 [SN]:Oak[ST]:St[SD]:E [ZP]:15213

Index values calculated: [HN]:125 [SN]:Oak(Soundex # ) [ST]:St [SD]:E [ZP]:15213 (Index #)

GIS TUTORIAL 1 - Basic Workbook


Geocoding steps1

Geocoding steps

Candidates identified: 125 East Oak Street15213

Candidates scored and filtered:

GIS TUTORIAL 1 - Basic Workbook


Geocoding steps2

Geocoding steps

Best candidate matched

Oak St

198

98

100

2

101

1

199

99

123

Pine Av

GIS TUTORIAL 1 - Basic Workbook


Address components

Address components

Number123Oak St E, Apt. 2, Pittsburgh, PA 15213

Street name 123 Oak St E, Apt. 2, Pittsburgh, PA 15213

Street type 123 OakStE, Apt. 2, Pittsburgh, PA 15213

Direction, suffix123 Oak St E, Apt. 2, Pittsburgh, PA 15213

Direction, prefix 123 EOak St, Apt. 2, Pittsburgh, PA 15213

Unit number123 Oak St E, Apt. 2, Pittsburgh, PA 15213

Zone, city123 Oak St E, Apt. 2, Pittsburgh, PA 15213

Zone, ZIP code123 Oak St E, Apt. 2, Pittsburgh, PA 15213

Items for single number street address:

Address Unit City ZIP Code

123 Oak St E Apt. 2 Pittsburgh 15213

GIS TUTORIAL 1 - Basic Workbook


Problems and solutions

Lecture 7

Problems and solutions

GIS TUTORIAL 1 - Basic Workbook


Possible problems

Possible problems

  • Variations in street names

    • Fifth Avenue, Fifth Ave., 5th AV

    • Saw Mill Run Blvd, Route 51

  • Data entry errors

    • Fidth Avenue

    • Sawmill Run

  • Place Names

    • White House, Heinz Field, Empire State Building

  • Intersections

    • Fifth Avenue and Craig Street

GIS TUTORIAL 1 - Basic Workbook


Possible problems1

Possible problems

  • Zones

    • 100 Main ST 15101, 100 Main ST 16202

  • P.O. boxes

    • P.O. Box 125

  • Missing street (TIGER) information

GIS TUTORIAL 1 - Basic Workbook


Solutions

Solutions

GIS TUTORIAL 1 - Basic Workbook

  • Clean data before geocoding

  • Use postal address standards

    • Publication 28 of the U.S. Post Office (2000)

      • Ultimate source on mailing address formats and codes

      • Provides standard street address formats

      • Standards include house number, prefix directional, street name, street suffix, common unit designator abbreviation for apartment, city, state abbreviation, five-digit ZIP code, ZIP+4 extension

  • Use Standard Intersection Connectors

    • & | @


Solutions1

Solutions

GIS TUTORIAL 1 - Basic Workbook

Use alias tables

Assign house numbers in rural areas

Purchase or build high quality maps (field verification)


Street map sources

Lecture 7

Street map sources

GIS TUTORIAL 1 - Basic Workbook


Tiger line files

TIGER/Line files

GIS TUTORIAL 1 - Basic Workbook

2000 Census street centerlines


Tiger line files1

TIGER/Line files

GIS TUTORIAL 1 - Basic Workbook


Tiger line files2

TIGER/Line files

GIS TUTORIAL 1 - Basic Workbook


Street map usa

Street Map USA

GIS TUTORIAL 1 - Basic Workbook


Gdt dynamap 2000 u s street data

GDT Dynamap/2000 U.S. street data

GIS TUTORIAL 1 - Basic Workbook

Small fee for individual ZIP code layers

Map layers are the highest quality street-map layers in terms of appearance, completeness, and accuracy

Maps include more than 14 million U.S. street segments and include postal boundaries, landmarks, water features, and other features


Polygon geocoding

Lecture 7

Polygon geocoding

GIS TUTORIAL 1 - Basic Workbook


Polygon geocoding1

Polygon geocoding

GIS TUTORIAL 1 - Basic Workbook

  • Method to map data whose identifier is a polygon (e.g. ZIP code, city, or county)

    • Create an aggregate table with a single record for each unique polygon

    • Count the records for each polygon

    • Join table to corresponding polygon layer

    • Symbolize with a choropleth map or graduated point symbols


Tiger polygon topology

TIGER: Polygon topology

GIS TUTORIAL 1 - Basic Workbook

ZIP codes

American Indian Reservation

Alaska Nature Village Statistical Area

Tribal Designated Statistical Area

Tribal Jurisdiction Statistical Area

Alaska Nature Regional Corp.

FIPS State and County Codes

MCD

Place

Census tract/block groups/blocks


Polygon geocoding zip codes

Polygon geocoding (ZIP codes)

GIS TUTORIAL 1 - Basic Workbook


Polygon geocoding zip codes1

Polygon geocoding (ZIP codes)

GIS TUTORIAL 1 - Basic Workbook

Points created at ZIP code centroids


Polygon geocoding zip codes2

Polygon geocoding (ZIP codes)

GIS TUTORIAL 1 - Basic Workbook

Spatially join points to polygons to make choropleth map


Choropleth map result

Choropleth map result

GIS TUTORIAL 1 - Basic Workbook


Geocoding in arcview

Lecture 7

Geocoding in arcview

GIS TUTORIAL 1 - Basic Workbook


Create address locator

Create address locator

GIS TUTORIAL 1 - Basic Workbook

ArcCatalog


Choose address locator style

Choose address locator style

GIS TUTORIAL 1 - Basic Workbook

Skeleton of the address locator

Based on data tables and reference layer


Choose reference layer

Choose reference layer

GIS TUTORIAL 1 - Basic Workbook

Streets, ZIP codes


Address locator properties

Address locator properties

GIS TUTORIAL 1 - Basic Workbook


Geocode in arcmap

Geocode in ArcMap

GIS TUTORIAL 1 - Basic Workbook

Add tabular data and streets layer

Add address locator

Geocode addresses

View geocoding results

Interactively rematch addresses


Address rematching

Address rematching

GIS TUTORIAL 1 - Basic Workbook

  • Investigate unmatched addresses

    • Generally requires expertise with knowledge of local streets

    • Compare street name in the attributes of streets table and address table


Prepare log file

Prepare log file

GIS TUTORIAL 1 - Basic Workbook

Log file includes reasons why addresses did not geocode

Useful for future work on cleaning addresses or repairing street maps


Useful websites

Lecture 7

Useful websites

GIS TUTORIAL 1 - Basic Workbook


Useful web sites

Useful Web sites

  • http://www.usps.gov/

  • http://www.geocode.com/geocode.htm

  • http://www.batchgeocode.com/

  • http://www.mapquest.com

  • http://maps.google.com

  • http://www.zipinfo.com

  • http://zipskinny.com/

  • Others?

GIS TUTORIAL 1 - Basic Workbook


Summary

Summary

GIS TUTORIAL 1 - Basic Workbook

Geocoding overview

Linear (street) geocoding

Problems and solutions

Street map sources

Polygon geocoding

Geocoding in ArcView

Useful Web sites


  • Login