AndreaBozzo/ceres-open-data-index huggingface dataset:
CT 2004 Spring Aerial Imagery (black & white, 0.8 foot)

This image service is available through [CTECO], a partnership between [UConn CLEAR] and [CT DEEP]. It is a virtual mosaic of 13,680 GeoTIFF tiles. Dataset Information Extent: Connecticut Dates: 2004, with minor areas from 2000 and 2005, between snow melt and leaf out Bands: 1 (black and white) Pixel resolution: 1 foot Image Tile Projection: CT State Plane NAD83 Feet (EPSG 2234) Service Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857) Tide Coordinated: No More Information - [2004 Orthophotography Data Guide on CT ECO] - [All about Aerial Imagery on CT ECO] - [Metadata] Credit and Funding Connecticut Department of Environmental Protection (CT DEEP), Connecticut Department of Emergency Services and Public Safety (DESPP), Connecticut Department of Transportation (DOT)
CT 1990 Spring Aerial Imagery (black & white, 1 meter)

This image service is available through [CTECO], a partnership between [UConn CLEAR] and [CT DEEP]. It is a virtual mosaic of 1,656 GeoTIFF tiles. Dataset Information Extent: Connecticut Dates: 1990 Bands: 1 (black and white) Pixel resolution: 1 meter Image Tile Projection: CT State Plane NAD83 Feet (EPSG 2234) Service Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857) Tide Coordinated: No More Information - [1990 Orthophotography Data Guide on CT ECO] - [All about Aerial Imagery on CT ECO] - [Metadata] Credit and Funding Connecticut Department of Energy and Environmental Protection (DEEP), U.S. Geological Survey (USGS)
CT Counties

This CT Counties layer consists of individual polygons representing each of the 8 counties that make up the state of Connecticut. This feature layer is directly derived from the [CTDOT Municipalities] feature layer geometry, created by CT Department of Transportation. The municipalities are dissolved into their associated counties. This feature layer includes US Census Federal Information Processing Standards (FIPS) codes that are associated with each municipality. This was included based on information from [Connecticut County to County Subdivision Crosswalk] from the US Census. The 9 Planning Regions in Connecticut have replaced the counties for statistical and administrative functions, so these 8 counties are used only in legacy geography. Connecticut’s 9 planning regions provide a geographic framework within which municipalities can jointly address common interests and coordinate such interests with state plans and programs. CGS Section [16a-4a] authorizes the Secretary of the Office of Policy and Management (OPM) to designate or redesignate the boundaries of logical planning regions. CGS Section [4-124j] authorizes the member municipalities of each planning region to establish a formal regional governance structure known as a council of governments (COG). For more information see: * [CT Office of Policy and Management, Regional Councils of Governments in Connecticut] * [Final Change to County Equivalents in Connecticut [PDF]] * [Final Federal Register Notice] * [CT Office of the Secretary of the State, Regional Councils of Governments] ────────────────┬─────────────────────────────────────────────── Field name │Field description ────────────────┼─────────────────────────────────────────────── County │Name of the county. ────────────────┼─────────────────────────────────────────────── CountyFIPS │US Census FIPS code associated with the county. ────────────────┼─────────────────────────────────────────────── StateFIPS │US Census FIPS code associated with the state. ────────────────┼─────────────────────────────────────────────── CountyFIPS_GEOID│Full US Census FIPS for the county. ────────────────┼─────────────────────────────────────────────── ObjectID │Unique Object ID. ────────────────┴─────────────────────────────────────────────── [CT Municipalities] [CT Counties] [CT Councils of Governments] [CT Planning Regions]
Soils Drainage Class

Drainage class (natural)" refers to the frequency and duration of wet periods under conditions similar to those under which the soil formed. Alterations of the water regime by human activities, either through drainage or irrigation, are not a consideration unless they have significantly changed the morphology of the soil. Seven classes of natural soil drainage are recognized-excessively drained, somewhat excessively drained, well drained, moderately well drained, somewhat poorly drained, poorly drained, and very poorly drained. These classes are defined in the "Soil Survey Manual. The State of Connecticut defines inland wetlands based on soils. The Connecticut Inland Wetlands and Watercourses Act defines wetland soils to include any of the soil types designated as poorly drained, very poorly drained, alluvial, or floodplain by the National Cooperative Soil Survey, as may be periodically amended, of the Natural Resources Conservation Service of the United States Department of Agriculture. Map units dominated by Connecticut inland wetland soils may have inclusions of non-wetland soils, and non-wetland map units may have inclusions of Connecticut inland wetland soils. On site investigation is necessary to determine the presence or absence of wetland soils in a particular area. This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was prepared by digitizing maps, by compiling information onto a planimetric correct base and digitizing, or by revising digitized maps using remotely sensed and other information. This data set consists of georeferenced digital map data and computerized attribute data. The map data are in a soil survey area extent format and include a detailed, field verified inventory of soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped. The soil map units are linked to attributes in the National Soil Information System relational database, which gives the proportionate extent of the component soils and their properties.
Soils Farmland Classification

Farmland classification identifies map units as prime farmland, farmland of statewide importance, farmland of local importance, or unique farmland. It identifies the location and extent of the soils that are best suited to food, feed, fiber, forage, and oilseed crops. NRCS policy and procedures on prime and unique farmlands are published in the "Federal Register," Vol. 43, No. 21, January 31, 1978. This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was prepared by digitizing maps, by compiling information onto a planimetric correct base and digitizing, or by revising digitized maps using remotely sensed and other information. This data set consists of georeferenced digital map data and computerized attribute data. The map data are in a soil survey area extent format and include a detailed, field verified inventory of soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped. The soil map units are linked to attributes in the National Soil Information System relational database, which gives the proportionate extent of the component soils and their properties.
Soils Hydric Rating

This rating indicates the percentage of map units that meets the criteria for hydric soils. Map units are composed of one or more map unit components or soil types, each of which is rated as hydric soil or not hydric. Map units that are made up dominantly of hydric soils may have small areas of minor nonhydric components in the higher positions on the landform, and map units that are made up dominantly of nonhydric soils may have small areas of minor hydric components in the lower positions on the landform. Each map unit is rated based on its respective components and the percentage of each component within the map unit. The thematic map is color coded based on the composition of hydric components. The five color classes are separated as 100 percent hydric components, 66 to 99 percent hydric components, 33 to 65 percent hydric components, 1 to 32 percent hydric components, and less than one percent hydric components. In Web Soil Survey, the Summary by Map Unit table that is displayed below the map pane contains a column named 'Rating'.In this column the percentage of each map unit that is classified as hydric is displayed. Hydric soils are defined by the National Technical Committee for Hydric Soils (NTCHS) as soils that formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part (Federal Register, 1994). Under natural conditions, these soils are either saturated or inundated long enough during the growing season to support the growth and reproduction of hydrophytic vegetation. The NTCHS definition identifies general soil properties that are associated with wetness. In order to determine whether a specific soil is a hydric soil or nonhydric soil, however, more specific information, such as information about the depth and duration of the water table, is needed. Thus, criteria that identify those estimated soil properties unique to hydric soils have been established (Federal Register, 2002). These criteria are used to identify map unit components that normally are associated with wetlands. The criteria used are selected estimated soil properties that are described in "Soil Taxonomy" (Soil Survey Staff, 1999) and "Keys to Soil Taxonomy" (Soil Survey Staff, 2006) and in the "Soil Survey Manual" (Soil Survey Division Staff, 1993). If soils are wet enough for a long enough period of time to be considered hydric, they should exhibit certain properties that can be easily observed in the field. These visible properties are indicators of hydric soils. The indicators used to make onsite determinations of hydric soils are specified in "Field Indicators of Hydric Soils in the United States" (Hurt and Vasilas, 2006).
Soils Inland Wetland

The State of Connecticut defines inland wetlands based on soils. The Connecticut Inland Wetlands and Watercourses Act defines wetland soils to include any of the soil types designated as poorly drained, very poorly drained, alluvial, or floodplain by the National Cooperative Soil Survey, as may be periodically amended, of the Natural Resources Conservation Service of the United States Department of Agriculture. Map units dominated by Connecticut inland wetland soils may have inclusions of non-wetland soils, and non-wetland map units may have inclusions of Connecticut inland wetland soils. On site investigation is necessary to determine the presence or absence of wetland soils in a particular area. This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was prepared by digitizing maps, by compiling information onto a planimetric correct base and digitizing, or by revising digitized maps using remotely sensed and other information. This data set consists of georeferenced digital map data and computerized attribute data. The map data are in a soil survey area extent format and include a detailed, field verified inventory of soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped. The soil map units are linked to attributes in the National Soil Information System relational database, which gives the proportionate extent of the component soils and their properties.
Water Pollution Control Facilities

Water Pollution Control Facilities represents data extracted from permit applications submitted to DEEP. Alias is the facility name utilized in DEEPs internal system whereas the Facility Name is the name utilized on the permit itself. Permittee Address is the address utilized for correspondence and Facility Address is the location of the plant. The Class field differentiates 4 levels of plants in CT (I, II, III, and IV) with I being the lowest and IV being the highest based on complexity of treatment and SCADA present at the plant. Permit ID is the NPDES or State Subsurface permit number. Facility ID is a State of Connecticut ID number assigned to each facility in the state for internal use.
Soils Parent Material Name

Parent material name is a term for the general physical, chemical, and mineralogical composition of the unconsolidated material, mineral or organic, in which the soil forms. Mode of deposition and/or weathering may be implied by the name. The soil surveyor uses parent material to develop a model used for soil mapping. Soil scientists and specialists in other disciplines use parent material to help interpret soil boundaries and project performance of the material below the soil. Many soil properties relate to parent material. Among these properties are proportions of sand, silt, and clay; chemical content; bulk density; structure; and the kinds and amounts of rock fragments. These properties affect interpretations and may be criteria used to separate soil series. Soil properties and landscape information may imply the kind of parent material. For each soil in the database, one or more parent materials may be identified. One is marked as the representative or most commonly occurring.The representative parent material name is presented here. This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was prepared by digitizing maps, by compiling information onto a planimetric correct base and digitizing, or by revising digitized maps using remotely sensed and other information. This data set consists of georeferenced digital map data and computerized attribute data. The map data are in a soil survey area extent format and include a detailed, field verified inventory of soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped. The soil map units are linked to attributes in the National Soil Information System relational database, which gives the proportionate extent of the component soils and their properties.
CT Municipalities (with FIPS)

This CT Planning Regions layer consists of individual polygons representing each of the 169 municipalities that make up the state of Connecticut. This feature layer is directly derived from the [CTDOT Municipalities] feature layer geometry, created by CT Department of Transportation. The municipalities are dissolved into their associated regional Councils of Governments. This feature layer includes US Census Federal Information Processing Standards (FIPS) codes that are associated with each municipality. This was included based on information from [Connecticut County to County Subdivision Crosswalk] from the US Census. ─────────────────────────┬──────────────────────────────────────────────────────────────────────────────── Field name │Field description ─────────────────────────┼──────────────────────────────────────────────────────────────────────────────── Municipality │Name of the municipality. ─────────────────────────┼──────────────────────────────────────────────────────────────────────────────── CouncilsOfGovernments │Name of the Councils of Governments region that the municipality is in. ─────────────────────────┼──────────────────────────────────────────────────────────────────────────────── County │Name of the county that the municipality is in. ─────────────────────────┼──────────────────────────────────────────────────────────────────────────────── PlanningRegion │Name of the Planning Region that the municipality is in. ─────────────────────────┼──────────────────────────────────────────────────────────────────────────────── StateFIPS │US Census FIPS code associated with the state. ─────────────────────────┼──────────────────────────────────────────────────────────────────────────────── CouncilsOfGovernmentsFIPS│US Census FIPS code associated with the Councils of Governments planning region. ─────────────────────────┼──────────────────────────────────────────────────────────────────────────────── MunicipalityFIPS │US Census FIPS code associated with the municipality. ─────────────────────────┼──────────────────────────────────────────────────────────────────────────────── MunicipalityFIPS_GEOID │Full US Census FIPS for the municipality. ─────────────────────────┼──────────────────────────────────────────────────────────────────────────────── ObjectID │Unique Object ID. ─────────────────────────┴──────────────────────────────────────────────────────────────────────────────── [CT Municipalities] [CT Counties] [CT Councils of Governments] [CT Planning Regions]
DEEP Property

[See full Data Guide here. ] DEEP Property is a polygon feature-based layer that includes all land owned in fee simple interest by the State of Connecticut Department of Energy and Environmental Protection. This layer is based on information that was collected and mapped at various scales and at different levels of accuracy. Generally, partial interests such as easements or development rights are not included in this layer. The exception is flood control areas, which may include permanent easements. Types of property in this layer include parks, forests, wildlife areas, flood control areas, scenic preserves, natural areas, historic reserves, DEEP owned waterbodies, water access sites and other miscellaneous properties. This layer is current and is updated as parcels are acquired by DEEP.
CT House Districts

This feature layer represents the boundaries of Connecticut's House of Representative’s districts based on the latest redistricting process following the 2020 Census. More information about the 2021 Redistricting Project can be found [here]. The dataset includes the 151 house districts with fields identifying the current CT House of Representatives members and their associated political party for each district. The geometry is derived from the published data from the [Connecticut General Assembly]. More information about the CT House of Representatives members can be found [here]. Collection of CT Legislative District published feature layers: * [Congressional districts] * [Senate districts] * [House districts] Attributes ─────────────────┬──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── District │House district number (text/string) ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── DistrictN │House district number (number/integer) ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Party │Member’s political party (Democratic or Republican) ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Full Name │Member’s full name ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Full Name + Party│Member’s full name, plus political party ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Term │The two-year term during which the member serves in their elected role ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Adjacent Color ID│An ID for the purpose of symbolization, so that each polygon receives a different color than the polygon adjacent to it. ─────────────────┴────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Environmental Justice 2025 Set

Environmental Justice 2025 Set is comprised of two layers: Environmental Justice Block Groups 2025 and Environmental Justice Distressed Municipality 2025. All Census and ACS data used in the creation of these data are the latest available from the Census at time of calculation. Environmental Justice Block Groups 2025 was created from Connecticut block group boundary data located in the Census Bureau's 2025 Block Group TIGER/Line Shapefiles. The poverty data used to determine which block groups qualified as EJ communities (see CT State statute 22a-20a) was based on the Census Bureau's 2024 ACS 5-year estimate. This poverty data was joined with the block group boundaries in ArcPro. Block groups in which the percent of the population below 200% of the federal poverty level was greater than or equal to 30.0 were selected and the resulting selection was exported as a new shapefile. The block groups were then clipped so that only those block groups outside of distressed municipalities were displayed. Maintenance – This layer will be updated annually and will coincide with the annual distressed municipalities update. The latest ACS 5-year estimate data should be used to update this layer. Environmental Justice Distressed Municipalities 2025 was created from the Connecticut town boundary data located in the Census Bureau's 2025 TIGER/Line Shapefiles (County Subdivisions). From this shapefile, "select by attribute" was used to select the distressed municipalities by town name (note: the list of 2025 distressed municipalities was provided by the CT Department of Economic and Community Development). The selection was then exported a new shapefile. The “Union” tool was used to unite the new shapefile with tribal lands (American Indian Area Geography) boundary data from the 2025 TIGER/Line files. In the resulting layer, the tribal lands were deleted so only the distressed municipalities remained. Maintenance – This layer will be updated annually when the DECD produces its new list of distressed municipalities. Note: A distressed municipality, as designated by the Connecticut Department of Economic and Community Development, includes municipalities that no longer meet the threshold requirements but are still in an eligibility grace period. (See definition at CGS Sec. 32-9p(b).) Fitting into that grace period, twelve towns continue to be eligible for distressed municipality benefits. Those are Ansonia, Bristol, Chaplin, Griswold, Groton, Montville, Naugatuck, New Haven, North Stonington, Preston, Stratford, Voluntown.
Brownfields 2025

#### Content Last Updated 2/19/2026 #### Connecticut defines Brownfields in [Section 32-760 of the Connecticut General Statutes] as: #### "any abandoned or underutilized site where redevelopment, reuse or expansion has not occurred due to the presence or potential presence of pollution in the buildings, soil or groundwater that requires investigation or remediation before or in conjunction with the restoration, redevelopment, reuse and expansion of the property.” #### CT DEEP [Brownfields Site Inventory Web Page] and Brownfields Excel Sheet. Data is updated annually in February and is sourced from the DECD Open Data Portal and the EPA ACRES database.
Watershed Boundary Dataset

This data set is a digital hydrologic unit boundary layer that is at the Subwatershed (12-digit) level. The original data set was developed by delineating the boundary lines on base USGS 1:24000 scale topographic quadrangle, and digitizing the delineated lines. Digital Raster Graphics (DRG) images were used for edits to the data layer. This data set consists of geo-referenced digital map data and attribute data. The spatial data are in a statewide coverage format and include complete coverage of the entire state of Connecticut, and small parts of surrounding states. The hydrologic unit ID code attached to each delineated polygon is linked to the attribute data.