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from $4.40 / 1,000 results

USGS Karst Sinkhole Risk Screener — Geohazard by Coordinate

Karst & sinkhole-risk screener: batch point-in-polygon over the USGS national CONUS_Karst compilation (7 layers: carbonate, evaporite, sandstone karst + pseudokarst). Returns in_karst_terrain, karst type, near-surface vs buried, rock unit, and an editorial sinkhole-risk tier per coordinate.

Pricing

from $4.40 / 1,000 results

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Developer

Kyle Maloney

Actor stats

Bookmarked

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Monthly active users

2 days ago

Last modified

Categories

Real estate

Developer tools

Agents

Asset label

asset_label

Optional

Caller-supplied label for the screened site.

Type:string | null

Example:Orlando, FL (buried carbonate karst)

Asset latitude

asset_lat

Optional

WGS84 latitude of the screened site.

Type:number | null

Example:28.54

Asset longitude

asset_lon

Optional

WGS84 longitude of the screened site.

Type:number | null

Example:-81.38

Search radius (mi)

radius_miles

Optional

Radius used for the nearby-karst check when the exact coordinate is clear.

Type:number | null

Example:2

In karst terrain

in_karst_terrain

Optional

TRUE if the coordinate falls inside one or more mapped USGS karst/pseudokarst polygons (authoritative point-in-polygon test). Null on error rows.

Type:boolean | null

Example:true

Primary karst class

primary_karst_class

Optional

Machine key of the highest-severity matched layer: carbonate, evaporite, sandstone_karst, evaporite_basin, gypsum_extent, piping_pseudokarst, or volcanic_pseudokarst.

Type:string | null

Example:carbonate

Primary karst label

primary_karst_label

Optional

Human-readable name of the highest-severity matched karst/pseudokarst layer.

Type:string | null

Example:Carbonate karst (limestone/dolostone)

Near surface

near_surface

Optional

TRUE if the primary matched unit is mapped at or near the land surface (highest susceptibility); FALSE if buried beneath insoluble cover; null when not applicable (e.g. subsurface basin/extent layers) or no hit.

Type:boolean | null

Example:false

Karst type detail

karst_type_detail

Optional

Raw decoded USGS description for the primary hit (KARST_TYPE text, DESCRIPT, or basin/lithology summary).

Type:string | null

Example:Carbonate rocks buried under <300 ft of insoluble sediments in a humid climate

Rock unit

rock_unit

Optional

Named geologic unit or formation for the primary hit, where mapped.

Type:string | null

Example:Hawthorn Group, Coosawhatchie Formation

Mapped state

mapped_state

Optional

US state abbreviation carried by the primary hit's source polygon, where available.

Type:string | null

Example:FL

Layers matched

layers_matched

Optional

Semicolon-separated list of every karst/pseudokarst layer whose polygon contains this exact coordinate (can be more than one where units overlap).

Type:string | null

Example:Carbonate karst (limestone/dolostone)

Layers matched count

layers_matched_count

Optional

Count of distinct karst/pseudokarst layers hit at this coordinate.

Type:integer | null

Example:1

Pseudokarst flag

pseudokarst_flag

Optional

TRUE if a hit came from a pseudokarst layer (soil-piping or volcanic lava-tube terrain) rather than true soluble-rock karst.

Type:boolean | null

Example:false

Nearby karst within radius

nearby_karst_within_radius

Optional

TRUE if the exact coordinate is clear but a mapped karst/pseudokarst polygon falls within the search radius (near-boundary flag). Always false when in_karst_terrain is true.

Type:boolean | null

Example:false

Nearby karst types

nearby_karst_types

Optional

Semicolon-separated labels of karst layers found within the search radius when the exact coordinate itself is clear.

Type:string | null

Example:null

Sinkhole risk context

sinkhole_risk_context

Optional

Editorial susceptibility tier: 'Elevated' (soluble rock at/near the surface — the classic active-dissolution condition), 'Moderate' (karst or pseudokarst present but buried, regional, or non-carbonate), or 'None mapped'. Null on error rows.

Type:string | null

Example:Moderate

Geotech Phase-I flag

geotech_phase1_flag

Optional

TRUE if this site should be flagged as a karst/sinkhole line item in a Phase-I geotechnical or environmental due-diligence review. Mirrors in_karst_terrain.

Type:boolean | null

Example:true

Note

note

Optional

Plain-English summary of the result for this asset.

Type:string | null

Example:Orlando, FL: falls within mapped soluble-rock karst terrain (Carbonate karst (limestone/dolostone)); the mapped unit is buried beneath insoluble cover...

Error

error

Optional

Per-asset error message (invalid coordinate or query failure); null when OK.

Type:string | null

Example:null

Disclaimer

disclaimer

Optional

Susceptibility-screen / not-a-site-specific-prediction note.

Type:string | null

Example:Regional geology-based karst/pseudokarst SUSCEPTIBILITY screen...

Source URL

source_url

Optional

USGS CONUS_Karst FeatureServer used.

Type:string | null

Example:https://services5.arcgis.com/njRHYVhl2CMXMsap/arcgis/rest/services/CONUS_Karst/FeatureServer

Checked at

checked_at

Optional

ISO 8601 timestamp of the run.

Type:string | null

Example:2026-07-18T18:00:00.000Z

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