Utilizing LA County Tax Assessor’s Database for Land Use Analysis
This guide outlines the process of using the LA County Tax Assessor’s Database to analyze land use. The tax roll, which offers substantial information, can be purchased and accessed through the designated P drive. To filter and export relevant data, focus on specific zip codes and use Excel to create a new column for Assessor Identification Numbers (AIN). Finally, integrate the data into ArcGIS by clipping and joining datasets for effective spatial analysis. Make sure to follow the guidelines to maintain data integrity.
Utilizing LA County Tax Assessor’s Database for Land Use Analysis
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Presentation Transcript
Using the Tax Assessor’s Database & Other land use datasets
Background • LA County Tax Assessor’s roll • Usually for purchase from • Used to locate addresses • Wealth of information • HUGE FILE!!
Using the Behemoth • P drive: LA_Assessor • Please do not make any changes directly • When copying to another computer, must copy whole file • Access file links to the TXT tax roll • Read me file and PDF is there for reference
Open Access • Click on one of the tables (they are the same thing) • Need to get out a manageable size such as a zip code • Highlight zip code field – wait a couple minutes or so and click ESC
Filter should pop up • Text filter – begins with • Enter your 5 digit zip code • Wait for the filter to complete • Go to the last record using the arrows at the bottom • Scroll to the top – press shift and then click on top record • All records should now be selected
Right click on the table name • Export – select excel • Make sure to click export data with formatting and layout • And – export only selected records
Open file in Excel • Create a new column named “AIN” • You need to concatenate the first three fields to get to create the AIN • Drag that formula down to the end of your spreadsheet • Ready to bring into ArcGIS!
Working in ArcGIS • Make sure you have a boundary file – eg. 90024 • Add the parcel shapefile • Clip the county wide parcel shapefile to your boundary file • Join the small assessor data to the small parcel layer
Using the Land Use File • Clip the county wide to your boundary file • Dissolve your parcels so they just become an outline • Clip the boundary land use to the dissolved parcels
