Entaxr nj tax maps of new jersey
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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


Governor s house

Governor’s House


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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