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enTaxr [ nj ] - Tax Maps of New Jersey. New Jersey Geospatial Forum 6 June 2014 www.wrwetzel.com/Cartography Bill Wetzel [email protected] Motivation / Trajectory. Wanted convenient access property data for specific parcels & explore neighborhoods

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entaxr nj tax maps of new jersey

enTaxr[nj] - Tax Maps of New Jersey

New Jersey Geospatial Forum

6 June 2014

www.wrwetzel.com/Cartography

Bill Wetzel

[email protected]

motivation trajectory
Motivation / Trajectory
  • Wanted convenient access property data for specific parcels & explore neighborhoods
  • Browsing difficult, search not forgiving in Open Public Records. QGIS, ArcGIS don’t scale.
  • Initial target was Google Earth, KML files containing property data, awkward user interface
  • Maps followed from generated shapefiles and property class, assessment data
  • Move to Google Maps for intuitive user interface
results
Results
  • Intuitive, graphical geospatial index to property data through Google Maps
  • Property data for 3,441,254  parcels in 565 towns in NJ
  • Maps for 21 counties and 565 towns
  • Error and mismatch logs for 565 towns
  • Tools for automatic generation of property data files and maps
fundamentals
Fundamentals
  • Municipality, not tile, is basic unit of locality
  • Fully automatic processing, no manual steps with gui-based GIS tools
  • Most work in EPSG:3424 (NAD 83/ NJ) projection. Convenient to work in feet.
  • Re-project to EPSG:4326 (WGS 84) for KML files
munis index map
Munis Index Map
  • All 565 municipalities
  • Zoom and click on municipality
  • Curiosities – diagonal line from Readington Township to Little Egg Harbor – must be a story
counties index map
Counties Index Map
  • 21 counties
  • Click on county or text in sidebar
mercer county index map
Mercer County Index Map
  • Click on municipality
  • All index maps semi-transparent to show town names on map
trenton parcels index map
Trenton Parcels Index Map
  • Zoom in, click on parcel
  • Parcels index on satellite view
  • Large municipalities split into sections
  • Google Maps limitation, 1000 parcels per KML file, about 14 KML files per section
  • Navigate with Prev/Next
300 riverview plaza trenton
300 Riverview Plaza, Trenton
  • Search Box on Parcels Index
  • Search only meaningful within current municipality
  • Hide / Show parcels layer
  • Legend – show legend on sidebar
  • Parcels Index over satellite view
  • County / Munis Index over street view
nearby area
Nearby Area
  • Parcels colored by property class
  • Residential, commercial, industrial muted
  • Exempt, vacant, farms and others less muted
property class map rumson
Property Class Map – Rumson
  • All maps to consistent scale
  • 10 feet /pixel - most
  • 5 feet / pixel – Monmouth
  • Space limits of web host
assessment map rumson
Assessment Map - Rumson
  • Colored blue to red
  • 21 Steps of $150,000
  • $0.0 to $3,000,000 and up
  • Exempt – light gray
  • No data – dark gray
  • High assessed value of exempt parcels confounded map
  • Tax map almost identical, not included here
property class map rumson1
Property Class Map - Rumson
  • Class ID shown in parcel
  • Same coloring as parcels on Google Maps
  • Coastline identified and colored
  • Follows from early interest in identifying waterfront property
  • Intersection of parcel with buffered coastline
  • Waterfront parcels no longer marked
  • Road style of secondary importance
assessment map rumson1
Assessment Map - Rumson
  • Assessment shown on edge of parcel if possible
  • Intent is qualitative heat map
assessment map monmouth county
Assessment Map – Monmouth County
  • Property Class & Assessment maps for all 21 counties
state table index
State Table Index
  • Alternate to index maps
  • Thumbnail links to maps
  • KML files
  • County table and graphical index
  • Graphs are experimental, have rough edges, not discussed further here
county table index
County Table Index
  • Thumbnail links to property class and assessment maps, (property tax maps for Monmouth)
  • Parcels graphical index
  • Error log
  • pams_pin mismatch log
inputs property data
Inputs - Property Data
  • Mod-IV assessment data
  • SR-1A sales data
inputs gis shapefiles
Inputs - GIS Shapefiles
  • Municipal parcels by county - NJ
  • County & municipal outlines - NJ
  • State coastline - NJ
  • Streets – Open Street Maps
  • Place names – Open Street Maps
  • Parcels, coastline, street places all clipped to municipal outlines
data quality
Data Quality
  • Non-numeric where numeric expected
  • Non-ASCII characters
    • 0xAC in “Ponce, Luis J-Ces*edes” in Rahway
    • Null character
  • Property Class – clean, not validated
  • Non-Usable Code – oh/zero, spaces, decimal points, some correctable
  • Few parcels mislabeled – apparent on maps
  • Curiosities - One parcel in Wrightstown lies within New Hanover
  • Winding direction of polygons/holes in shapefiles slightly inconsistent
common errors
Common Errors

Overall, given 3,441,254 parcels, data is remarkably clean

pams pin
pams_pin
  • Critical field – join parcel shapefile with property data, no data to display if mismatch
  • Typos – leading zero, extra decimal point
  • Assessor creativity – non-numeric in block/lot number: 0904_1_2.B, 0904_189.A_29.A
  • Inconsistent use of qcode field
  • Systemic errors – temporal misalignment, lot renumbering, missing updates, duplication, missing qcodes
pams pin correction heuristics
pams_pinCorrection Heuristics
  • Remove qcode – 14,126
  • Remove leading zero from lot number - 7527
  • Add leading zero to lot number - 1835
pams pin mismatch rate
pams_pin Mismatch Rate
  • Almost classic 80/20 rule – 16% of towns have 80% of the mismatches
other errors
Other Errors
  • Log scale used because of large range of error counts. Zero-error-count data points are not shown.
  • 387 towns have no errors
  • Jersey City has 6599 errors from duplication
questions plea to assessors and the gis community
Questions / Plea to Assessors and the GIS Community
  • Are lists of errors and mismatches in one place for all municipalities helpful?
  • Has anyone done it before? Does anybody care?
  • If so, how disseminate the lists to assessors or others for correction?
  • How validate errors, especially qcode issues?
  • Assessors – please look at Error Log on the website and correct the errors, if any, for your town’s property data.
development environment
Development Environment
  • Linux Mint, Python, JavaScript
  • Pyshp – shapefileprocessing
  • Pyproj – projection translation
  • Shapely – intersections, buffers
  • Simplekml – KML file creation
  • Mapnik – map production
  • Pandas, numpy, matplotlib – limited use
future direction
Future Direction
  • Move property data from KML file to database
  • Add generalized search over property data
  • Add other maps – zoning, hazard (flood and toxic areas), census data
  • Add error summaries
  • Explore GDAL/OGR library
  • Find market for project
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