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
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