A brief summary of the parcel data found in Transect and frequently asked questions.
Transect maintains a license to nationwide parcel data from Landgrid. The data includes 144 million parcel boundaries and records covering 95% of America, plus associated parcel data like owner name, address, and more.
Parcel data is available under Setting > Parcels.
Frequently Asked Questions
Where does the County data come from?
Landgrid sources data directly from each county or whom they designate as the official source for their parcel data.
Some counties are missing from the dataset but are labeled as “Available”, what does that mean?
Available county data means that Landgrid has confirmed the data is available from the County, but for some reason they did not obtain the data. The usual reason is cost from the County, some Counties price their parcel data very high.
When was the data last updated?
On average 94% of the parcels have been refreshed in the last 12 months, with most of those in the last 6 months. The updates are on a rolling update schedule, refreshing county data directly for 100 - 300 counties per month, usually grouped by state.
What do the attributes in the data mean?
Landgrid cleans and converts all county parcel data into a common schema. Please see the link below for a definition of each parcel attribute:
Why do the parcel value fields (‘parval’) not look the way I expect?
The parcel value related fields are all directly from the County Assessor’s data. They are populated as directly from the Assessor attributes as possible for the ‘improvements value’ (improvval), ‘land value’ (landval), ‘parcel value’ (parval), ‘ag value’ (agval) and ‘parcel valuation method’ (parvaltype) attributes. However, while those are the most common value related attributes, every County has their own definition for those attributes and their own methods for how they calculate, record and display amounts for tax purposes. We can not answer questions about why the County records the values in those attributes. We suggest visiting the County’s website or calling the Assessor’s office directly to better understand those values. If, after contacting the County it appears there is an error in what values are in those attribute fields, please send an email to email@example.com.
Why do the parcel numbers (apn, pin, etc) not look the way I expect?
County Assessor parcel identification numbers (‘parcelnumb’) are well known for being complicated and often have variable punctuation or zeros (0) that can affect searching or matching by parcel id number. Counties do occasionally change their method for generating or assigning parcel numbers and that can lead to “new” and “old” parcel number situations. Landgrid always retains any identification number attributes as ‘County Custom Columns’ so it should be possible to match up the data with County data directly, even if the parcel number field is not the only identification number used by the County.
Also, sometimes a State GIS source will add their own unique id to a local parcel id number.
We suggest visiting the County’s website or calling the Assessor’s office directly to better understand their parcel numbering system. If, after contacting the County it appears there is an error in what values are in the parcel id attribute field, please send an email to firstname.lastname@example.org.
Do you have a specific attribute for a specific County?
A current, detailed list of every County in Landgrid's data set and what data fields are available for each county is always available at this URL.
What if the data looks incorrect?
Transect provides to our customers the parcel data exactly as we receive it from Landgrid. We are happy to try to help you interpret the data, but we cannot always successfully troubleshoot errors that you find as the data is directly sourced from a third party.
More more FAQs, please visit Landgrid's website here.