The foundation of everything in this portal. A parcel is a single, legally-defined plot of land identified by the Town of Dennis Assessing Department. Every deed record, GIS overlay, and annotation in the system links back to one or more parcels. Start here when you want to know about a specific piece of land — who owns it, what it's assessed at, whether it carries any restrictions, and whether it's currently on the market.

Legal instruments recorded with the Barnstable Registry of Deeds: warranty deeds, conservation restrictions, deed restrictions, Chapter 61 agreements, easements, and more. Documents tell the ownership and encumbrance history of land. Where deed scans are available locally, the portal processes them with optical character recognition to automatically score language relevant to conservation — restrictions, Article 97 protections, agricultural preservation, and similar terms.

Data assembled from external sources and computed from those sources — everything in the portal that isn't a human determination. External layers include MassGIS environmental overlays, Town of Dennis assessor records, deed OCR keyword scores from the Registry, and real estate listings. Derived layers join those sources together: the parcel backbone, GIS presence flags, identity status when assessor and GIS records disagree. Dynamic layers combine external data with staff determinations to produce up-to-date rollups: current development coverage inventory, Article 97 progress across the portfolio. If a value comes from a feed or a calculation, it's a Layer.

Staff decisions recorded alongside the data. Each tag dimension is a question DCLT needs to answer about parcels or documents: How developed is this parcel? Does this deed restrict land under Article 97? A tag records a staff member's determination — with a full history of who decided what and when. Machine signals from OCR scores and GIS overlays surface candidate records; the tag is the verdict. Tags are always staff-authored: if a value comes from a feed or a calculation, it's a Layer, not a Tag. Combine tag dimensions to build focused shortlists: every underdeveloped parcel, every unconfirmed Article 97 document.