Environment & Risk

Part of the Regrid Parcel Schemas reference. Label definitions, source/standardization value meanings, and live coverage access are on that parent page. ⭐ marks the recommended field for its job; fields marked API Queryable can filter the /parcels/query endpoint (max 4 fields per query).

fema_flood_zone — FEMA Flood Zone ⭐

Description: FEMA Flood Zone per the Flood Insurance Rate Map (FIRM). Zones beginning with A or V represent the highest level of flood risk. More info here: https://www.fema.gov/glossary/flood-zones

Use it for: What type of flood zone is this property in, if any?

Related fields: fema_flood_zone_subtype, fema_nri_risk_rating
How it's made: Spatially matched to FEMA data
Units: Code · Valid range: See linked docs · Example: A
Coverage: See fema_flood_zone_pct in the live Coverage Report CSV.
Related docs: https://www.fema.gov/flood-maps

Also known as: flood zone, flood risk, floodplain, is it in a flood zone, FEMA flood (field aliases: flood_zone, FIRM_zone, FEMA_zone)

fema_flood_zone_subtype — FEMA Flood Zone Subtype

Description: FEMA Flood Zone Subtype per the Flood Insurance Rate Map (FIRM) providing specific details around the associated Flood Zone.

Use it for: What is the subtype of the flood zone?

Related fields: fema_flood_zone ⭐
How it's made: Spatially matched to FEMA data
Units: Code · Valid range: See linked docs · Example: 1 PCT ANNUAL CHANCE FLOOD HAZARD CONTAINED IN STRUCTURE
Coverage: See fema_flood_zone_subtype_pct in the live Coverage Report CSV.
Related docs: https://www.fema.gov/flood-maps

Also known as: flood zone detail, flood zone subtype (field aliases: flood_zone_subtype, FIRM_subtype)

fema_flood_zone_raw — FEMA Flood Zone Raw Data

Description: JSON field containing more complex details related to the Flood Zone specifically in instances where multiple Flood Zones are associated with a property.

Use it for: Machine-readable raw flood details for more calculations

How it's made: Spatially matched to FEMA data
Units: JSON · Valid range: JSON blob · Example: [{"zone":"A","subtype":"1 PCT ANNUAL CHANCE FLOOD HAZARD CONTAINED IN STRUCTURE","percent":0.18},{"zone":"A","subtype":"RIVERINE FLOODPLAIN IN COASTAL AREA","percent":0.04},{"zone":"X","subtype":"AREA OF MINIMAL FLOOD HAZARD","percent":0.29}]
Coverage: See fema_flood_zone_raw_pct in the live Coverage Report CSV.
Related docs: https://support.regrid.com/property-app/fema-flood-layer

Also known as: (field aliases: flood_zone_raw, FEMA_FIRM_raw, flood_details_json)

fema_flood_zone_data_date — FEMA Flood Zone Data Date

Description: The Effective Date of the Flood Insurance Rate Map (FIRM) for the associated Flood Zone and property.

How it's made: Spatially matched to FEMA data
Units: Date · Valid range: Date · Example: 2023-09-01
Coverage: See fema_flood_zone_data_date_pct in the live Coverage Report CSV.
Related docs: https://support.regrid.com/property-app/fema-flood-layer

Also known as: (field aliases: FIRM_effective_date, flood_map_effective_date)

fema_nri_risk_rating — FEMA NRI Risk Rating

Description: Sourced from FEMA's National Risk Index; the Risk Rating leverages available source data for natural hazard and community risk factors to develop a baseline relative risk measurement for each U.S. Census tract for all 50 states, the District of Columbia (DC), American Samoa (AS), Commonwealth of the Northern Mariana Islands (MP), Guam (GU), Puerto Rico (PR), and the U.S. Virgin Islands (VI). The National Risk Rating is intended to help users better understand the natural hazard risk of their communities by providing a category range from “Very Low” to “Very High.” A "No Rating" designation does not equate to a null value. It typically means that the area has no measurable building, population, or agricultural value exposed to a specific hazard, or that the calculated annualized loss (EAL) for that hazard is zero. More details on this methodology can be found in FEMA’s technical documentation: https://www.fema.gov/sites/default/files/documents/fema_national-risk-index_technical-documentation.pdf

Use it for: How risky is it to build here?

Related fields: fema_flood_zone ⭐
How it's made: Spatially matched to FEMA data
Valid range: See FEMA documentation
Coverage: See fema_nri_risk_rating_pct in the live Coverage Report CSV.
Related docs: https://support.regrid.com/property-app/fema-flood-layer

Also known as: natural hazard risk, disaster risk, how risky, FEMA risk rating (field aliases: NRI_risk_rating, risk_category, risk_rating)

cdl_majority_category — Cropland Data Layer Majority Category ⭐

Description: Human readable label for the majority CDL value. Cropscape and CDL documentation use the term "category" to describe these, so that is why we use 'category' in this attribute name. [Available for parcels 10 acres or larger.]

Use it for: The single most prevalent crop, eg "Corn". Helpful for high-level viz and analysis of agricultural land use

Related fields: cdl_majority_percent, cdl_raw
How it's made: Calculated from the Cropland Data Layer raster data for parcels >= 10 acres
Units: Code · Valid range: See linked docs · Example: corn, wheat, soybean
Coverage: Calculated for parcels >= 10 acres. Source data makes reliability low for smaller parcels See cdl_majority_category_pct in the live Coverage Report CSV.
Related docs: Cropland Data Layer (CDL) Key

Also known as: crop, what is growing, main crop, agricultural land cover (field aliases: dominant_CDL_category, majority_category)

cdl_majority_percent — Cropland Data Layer Majority Percent

Description: Percentage of the parcel that the 'cdl_majority_category' covers. We intend 'cdl_majority_category' and 'cdl_majority_percent' to be used together and we include these attributes individually for easy access when doing application development or analysis. [Available for parcels 10 acres or larger.]

Use it for: What % of the parcel is covered by the biggest crop?

How it's made: Calculated from the Cropland Data Layer raster data for parcels >= 10 acres
Units: Double Precision · Valid range: 0+ · Example: 32.3
Coverage: Calculated for parcels >= 10 acres. Source data makes reliability low for smaller parcels See cdl_majority_percent_pct in the live Coverage Report CSV.
Related docs: Cropland Data Layer (CDL) Key

Also known as: (field aliases: majority_percent, dominant_percent, cover_percent)

cdl_raw — Cropland Data Layer Raw Values

Description: A variable length array of 2-member arrays indicating the Cropland Data Layer (CDL) values in position 1, and the percentage of the parcel area covered by that value in the parcel in position 2. Typical parcels have 2-10 different CDL values, and hopefully one predominates in covering the parcel. CDL values can also be grouped. 'value' is the USDA term for the number code that corresponds to a particular crop type or other land cover type, (1, 2, 3 ... 254, but only about 100 numbers used in that range currently by USDA). The human readable label for that 'value' is called the 'category'. A key file providing value and category mappings and link to the USDA references is available here Cropland Data Layer Key [Available for parcels 10 acres or larger.]

Use it for: Machine-readable collection of what's growing on this property and the % of the property it covers

How it's made: Calculated from the Cropland Data Layer raster data for parcels >= 10 acres
Example: [[141, 67.2], [190, 31.1], [176, 1.6]]
Coverage: Calculated for parcels >= 10 acres. Source data makes reliability low for smaller parcels See cdl_raw_pct in the live Coverage Report CSV.
Related docs: Cropland Data Layer (CDL) Key

Also known as: (field aliases: CDL_raw, land_cover_raw, cropland_raw)

cdl_date — Cropland Data Layer Date

Description: Cropland Data Layer (CDL) date. Usually released in February, annually, for the previous year. [Available for parcels 10 acres or larger.]

Use it for: What vintage is the CDL data?

How it's made: Calculated from the Cropland Data Layer raster data for parcels >= 10 acres
Valid range: Recent date (within last 2 years) · Example: 2019-02-01
Coverage: Calculated for parcels >= 10 acres. Source data makes reliability low for smaller parcels See cdl_date_pct in the live Coverage Report CSV.
Related docs: Cropland Data Layer (CDL) Key

Also known as: (field aliases: CDL_year, CDL_date)

roughness_rating — Terrain Roughness Rating

Description: The amount of elevation variability within a parcel. Calculated per parcel from Digital Elevation Model (DEM).
0 = a level terrain surface
1 = a nearly level terrain surface
2 = a slightly rugged terrain surface
3 = an intermediately rugged terrain surface
4 = a moderately rugged terrain surface
5 = a highly rugged terrain surface
6 = an extremely rugged terrain surface
Additional details at: https://support.regrid.com/parcel-data/parcel-elevation-faq

Use it for: Tells you how flat the parcel is. Useful for knowing how difficult it will be to build on or otherwise use the parcel

How it's made: Calculated from a raster Digital Elevation Model.
Units: Index Score
Coverage: See roughness_rating_pct in the live Coverage Report CSV.
Related docs: Parcel Elevation FAQ

Also known as: terrain, how flat, slope, ruggedness, buildability (field aliases: terrain_roughness, ruggedness_class, TRI_class)

highest_parcel_elevation — Highest Parcel Elevation

Description: Highest elevation value (meters) intersecting the parcel calculated using best available terrain data. Calculated for each parcel
Additional details at: https://support.regrid.com/parcel-data/parcel-elevation-faq

Use it for: The highest elevation on the parcel. Combine with lowest elevation to see maximum elevation change across the parcel.

Related fields: lowest_parcel_elevation
How it's made: Calculated from a raster Digital Elevation Model.
Units: Meters
Coverage: See highest_parcel_elevation_pct in the live Coverage Report CSV.
Related docs: Parcel Elevation FAQ

Also known as: elevation, how high, highest elevation (field aliases: max_elevation, highest_elevation)

lowest_parcel_elevation — Lowest Parcel Elevation

Description: Lowest elevation value (meters) intersecting the parcel calculated using best available terrain data. Calculated for each parcel.
Additional details at: https://support.regrid.com/parcel-data/parcel-elevation-faq

Use it for: The lowest elevation on the parcel. Combine with highest elevation to see maximum elevation change across the parcel.

Related fields: highest_parcel_elevation
How it's made: Calculated from a raster Digital Elevation Model.
Units: Meters
Coverage: See lowest_parcel_elevation_pct in the live Coverage Report CSV.
Related docs: Parcel Elevation FAQ

Also known as: elevation, lowest elevation (field aliases: min_elevation, lowest_elevation)

insite_score — InSite Score

Description: NatureServe InSite Score, an integrated biodiversity value score.

Use it for: NatureServe's InSite score, an integrated measure of biodiversity value for the parcel's location. Higher scores indicate greater biodiversity significance - useful for conservation prioritization and environmental screening.

Do not use it for: A regulatory or protected-status designation - it is a screening indicator, not a legal status. For public access designation see padus_public_access.

Related fields: padus_public_access, fema_nri_risk_rating
How it's made: NatureServe InSite model output, joined to parcels by Regrid.
Units: Score
Coverage: Near-nationwide coverage. See insite_score_pct in the live Coverage Report CSV.

Also known as: biodiversity, conservation value, habitat value, environmental significance, nature score