State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
20051231
Connecticut Erosion Sites
2005
vector digital data
Hartford, Connecticut, USA
State of Connecticut, Department of Environmental Protection
The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. Data compiled at 1:24,000 scale.
http://www.ct.gov/deep
Mary DiGiacomo-Cohen
20051231
Statewide GIS Analysis and Mapping of the Geologic Conditions Contributing to Eroding Terrace Escarpments
document
Groton, Connecticut, USA
Long Island Sound Resource Center
The erosion-sites data layer is part of a Statewide GIS Analysis and Mapping of the Geologic Conditions Contributing to Eroding Terrace Escarpments, Project #03-02 of the Nonpoint Source Management Grant Program, funded under Section 319 (h) of the Federal Clean Water Act, and administered by the Connecticut Department of Environmental Protection.
Connecticut Erosion Sites is a site specific, point feature-based layer developed at 1:24,000-scale that includes decriptive information regarding the character of the erosion (severity, slope, geologic factors) at selected locations through out the state. The layer is based on information collected and compiled during October-December, 2005 while field testing the applicability of the Erosion Susceptilibity layer developed as part of Project #03-02 Statewide GIS Analysis and Mapping of the Geologic Conditions Contributing to Eroding Terrace Escarpments. The layer represents conditions at a particular point in time. The layer includes 83 locations and descriptive attributes (site name, severity of erosion, description, etc) as well as attributes from a spatial join with merged soils and quaternary geology layers. Features are point locations that represent the selected study areas within the state; it is NOT a comprehensive inventory of erosion locations. Data is compiled at 1:24,000 scale. This data is not updated.
Connecticut Erosion Sites is a site specific data layer developed at 1:24,000-scale. The purpose of this layer is show locations and provide desriptions of erosion sites used to confirm the applicability of the draft erosion suscepibility map. Erosion sites were inventoried in selected areas of the state wide study area. This map should be used in conjunction with the final 1:24,000 scale Erosion Susceptibility layer and other documents developed for the Project #03-02: Statewide GIS Analysis and Mapping of the Geologic Conditions Contributing to Eroding Terrace Escarpments. The objective of this project is to identify the geologic conditions that lead to eroding terrace escarpments throughout the state. This layer is part of an information package that can be used as a planning and management tools by state and municipal officials. Not intended for maps printed at map scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet.)
For additional information, refer to Statewide GIS Analysis and Mapping of the Geologic Conditions Contributing to Eroding Terrace Escarpments, Project #03-02 Final Report, prepared by Mary L. DiGiacomo-Cohen, Long Island Sound Resource Center, University of Connecticut, Avery Point, Groton, CT 06340 in conjunction with North Central Conservation District, 24 Hyde Ave., Vernon, CT, 06066. Report prepared for Nonpoint Source Management Grant Program, Funded under Section 319 (h) of the Federal Clean Water Act, administered by the Connecticut Department of Environmental Protection.
20051231
publication date
None planned
-73.177488
-71.813630
42.024793
41.285074
None
Erosion
Soils
Quaternary Geology
Stratified Deposits
Terrace Escarpments
Sedimentation
Siltation
ISO 19115 Topic Category
geoscientificInformation
None
Connecticut River
Thames River
Housatonic River
Quinebaug River
Farmington River
Salmon River
U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the Outlying Areas of The United States, and Associated Areas (Federal Information Processing Standard 5-2): Washington, DC, National Institute of Standards and Technology.
Connecticut
CT
U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard (FIPS) 10-4): Washington, D.C., National Institute of Standards and Technology.
United States of America
USA
None. The data is in the public domain and may be redistributed.
No restrictions or legal prerequisites for using the data. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet). Although this data set has been used by the State of Connecticut, Department of Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Environmental Protection as to the accuracy of the data and or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing this data on a map or using it in a software application, analysis, or report, please acknowledge the State of Connecticut, Department of Environmental Protection as the source for this information. For example, include the following data source description when printing this layer on a map: Erosion_severity from the Erosion_sites layer, compiled and published by CT DEP. Source map scale is 1:24,000.
State of Connecticut, Department of Environmental Protection
mailing and physical address
79 Elm Street
Hartford
Connecticut
06106-5127
USA
860-424-3540
860-424-4058
dep.gisdata@ct.gov
Monday to Friday, 08:30 to 16:30 Eastern Standard Time
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/erosionsusceptibilitypolypointfullview.gif
Full view of Connecticu Erosion Sites shown with Connecticut Erosion Susceptibility in the background. These are sites where detailed descriptions of erosion conditions was used to confirm the applicability of the draft erosion susceptibility data.
GIF
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/erosionsusceptibilitypolypointdetailview.gif
Detailed view of Connecticu Erosion Sites shown with Connecticut Erosion Susceptibility in the background. These are sites where detailed descriptions of erosion conditions was used to confirm the applicability of the draft erosion susceptibility data.
GIF
These data are maintained by the State of Connecticut using ArcGIS software developed by Environmental Systems Research Institute (ESRI) in a Microsoft Windows operating system environment.
The erosionsites layer retains the feature types and information identified by the State of Connecticut, Department of Environmental Protection and obtained from the data compiler. All attributes have valid values. Values are within defined domains. The accuracy test for the attribute values was conducted by comparing the information presented in the source data with 1:24,000-scale field sheets and interactive displays of the data on a computer graphic system. These check plot maps and computer displays depicted and labeled the erosionsites features in different colors based on values for comparison with the original data source. AV_LEGEND and IMS_LEGEND are broad classifications of erosionsites features. AV_LEGEND, and IMS_LEGEND were not manually entered. These additional fields were populated by calculating values equal to existing fields. Erosionsites features were manually selected and populated with descriptive attributes values to (uniquely) identify and describe individual features. Attributes respresenting geologic and soils conditions for each sites, and erosion category were populated by spatial join.
Point features conform to the following topological rules. Points are single part. There are no duplicate points. Points do not overlap. Establishment of logical consistency was performed by the State of Connecticut, Department of Environmental Protection using ESRI ArcGIS software to manually create and control feature topology in shapefile format. No automated procedures or tests were performed to guarantee desired topology other than visual inspection.
The completeness of the data reflects the feature content of the data sources, which include the FIELD DATA SHEETS for the project. The erosionsites layer is complete in the sense that it accurately reflects the contents of the Erosion sites field information available at the time the State of Connecticut, Department of Environmental Protection created the layer. However, compared to current conditions, the erosionsites layer is incomplete. This data is not updated.
The horizontal positional accuracy of this data complies with the United States National Map Accuracy Standards for 1:24,000 scale maps. According to this standard, not more than 10 percent of the locations tested are to be in error by more than 1/50 inch (40 feet) measured on the publication scale of a USGS 7.5 minute topographic quadrangle map. Some feature locations were interpolated from the transporation features, surface water features, elevation contours, buildings, and built-up areas depicted on USGS 7.5 minute topographic quadrangle maps. Other feature locations were derived from GPS coordinates; their horizontal precision exceeds the map standard.Typically, the Trimble Pro XR collects data with the PDOP set to 6.0 and the S/N set to 10.0 the standard error of the collected data is less than 1 meter, so the 95% confidence is on the order of 2 meters.
Point features represent approximate positions for linear or large area objects or observations that are transient, variable or temporal in nature.
Some features are accurately positioned because GPS-based coordinates were collected at the actual location of the site in the field, and other features are less accurately positioned because the site represents a large area which was interpolated from topographic quadrangle maps.
State of Connecticut, Department of Environmental Protection
2005
field sheets for erosion study
map
Hartford, Connecticut
State of Connecticut, Department of Environmental Protection
field sheets consist of draft erosion susceptibility map overprinted on DRG topographic quads at 1:24,000 scale
24000
paper
2005
publication date
field map
field sheets consist of draft erosion susceptibility map overprinted on DRG topographic quads at 1:24,000 scale
State of Connecticut, Department of Environmental Protection
Unpublished Material
GPS locations
vector digital data
Hartford, Connecitcut, USA
State of Connecitcut, Department of Environmental Protection
http://www.ct.gov/deep
24000
disc
unknown
ground condition
gps.shp
GPS.shp is in Shapefile format.
Mary DiGiacomo-Cohen
Unknown
eunion.shp
vector digital data
Groton, Connecticut, USA
Long Island Sound Resource Center
24000
disc
unknown
ground condition
eunion.shp
union of soils and quaternary geology data layers
State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
20051231
Connecticut Erosion Sites
vector digital data
Hartford, Connecticut, USA
State of Connecticut, Department of Environmental Protection
http://www.ct.gov/deep
24000
disc
20051231
publication date
Erosion_Susceptibility_Sites.shp
Erosion_Susceptibility_Sites.shp is in Shapefile format.
State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
20051231
Connecticut Erosion Sites
vector digital data
Hartford, Connecticut, USA
State of Connecticut, Department of Environmental Protection
http://www.ct.gov/deep
24000
disc
20051231
publication date
Erosion_Susceptibility_Sites
Erosion_Susceptibility_Sites is in GeoDatabase Feature Class format.
Feature digitizing and attribution (heads up digitizing method) - Using ESRI ArcView 3 software, features appearing on the source map were manually digitized on the screen (heads-up digitizing) at display scales greater than 1:24,000 using USGS 7.5 minute topographic quadrangle maps displayed in the background for reference. Individual features were digitized based on topographic base information. Features were assigned attribute values based on information shown on the field maps. Feature location and attribute accuracy was visually checked and inspected by symbolizing and labeling features according to attribute value on the computer screen and comparing this information to the orginal source data.
field map
2005
Erosion_Susceptibility_Sites.shp
Long Island Sound Resource Center
Mary DiGiacomo-Cohen
mailing and physical address
UConn Avery Point
1080 Shennecossett Rd
Groton
CT
06340
USA
860 405-9015
lisrc@uconn.edu
Erosion locations were captured with a Trimble Pro XR backpack GPS unit. The unit's filters were set to capture points with a PDOP of < 10.0 and a S/N (signal to noise ration) of greater > 1.0. The data was post processed against a base station and then exported into ArcView shape files using the Connecticut State Plane NAD 83 coordinate system. Features were copied to erosionsites.shp and assigned attribute values based on information shown on the field maps and field logs. Feature location and attribute accuracy was visually checked and inspected by symbolizing and labeling features according to attribute value on the computer screen and comparing this information to the orginal source data.
gps.shp
2005
Erosion_Susceptibility_Sites.shp
State of Connecticut, Department of Environmental Protection
Thomas Nosal
mailing and physical address
79 Elm St
Hartford
CT
06106-5127
USA
(860) 424-3590
Attribute enhancements - a spatial join was used to add attributes from a data layer respresenting the union of soils and quaternary geology (which was dissolved to create Erosion Susceptibilty layer). Additionally the AV_LEGEND attribute was added to establish a very general classification scheme for symbolizing features.
eunion.shp
2005
Erosion_Susceptibility_Sites.shp
Long Island Sound Resource Center
Mary DiGiacomo-Cohen
mailing and physical address
UConn Avery Point
1080 Shennecossett Rd
Groton
CT
06340
USA
860 405-9015
lisrc@uconn.edu
Convert to GeoDatabase Feature Class format - Defined new Feature Class named Erosion_Susceptibility_Sites; and imported the attribute definitions, loaded features and imported metadata from Erosion_Susceptibility_Sites.shp shapefile.
Spatial Reference Properties for Feature Class:
Coordinate System: NAD_1983_StatePlane_Connecticut_FIPS_0600_Feet
XY Domain MinX: 100000; MaxX: 2247483.645
XY Domain MinY: 200000; MaxY: 2347483.645
Precision: 1000
Erosion_Susceptibility_Sites.shp
20061108
Erosion_Susceptibility_Sites
State of Connecticut, Department of Environmental Protection
Howie Sternberg
mailing and physical address
79 Elm Street
Hartford
Connecticut
06106
USA
860-424-3540
State of Connecticut, United States of America
Vector
Entity point
83
Lambert Conformal ConicLambert Conformal Conic41.20000041.866667-72.75000040.833333999999.999996499999.999998
coordinate pair
0.000250
0.000250
survey feet
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
1.000000
Explicit elevation coordinate included with horizontal coordinates
Connecticut Erosion Sites
Erosion sites represented as point features.
State of Connecticut, Department of Environmental Protection
OBJECTID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
SHAPE
Feature geometry.
ESRI
Coordinates defining the features.
COMMENT
Site identifier or casual name
compiler
text value
EROSION_SE
Erosion severity
compiler
text value
subjective
as observed by compiler
DESCRIP
brief decription of site conditions, geologic observations
compiler
text value
subjective
as seen by compiler
TOWN
Town Name
compiler
text value
VISIT_DATE
date of site visit YYYYMMDD
compiler
Coordinates defining the features.
20051018
20051219
LOCATION
source of location data
compiler
topo map
digitized point location based on topographic base map features
compiler
GPS
point location from Trimble Pro XR unit/software
compiler
PHOTO1ID
file name of first photo of this site
compiler
text value
PHOTO2ID
file name of second photo of this site
compiler
text value
PHOTO3ID
file name of third photo of this site
compiler
text value
PHOTO4ID
file name of fourth photo of this site
compiler
text value
AV_LEGEND
same as severity of erosion
compiler
text value
QUPOLY_CD
Quaternary Geologic polygon code
Quaternary Geologic Map of Connecticut and Long Island Sound Basin
text value
1:24,000 scale
from spatial join with eunion.shp (merged soils and quaternary geology data layers)
QUATGEOL
Quaternary Geology
Quaternary Geologic Map of Connecticut and Long Island Sound Basin
text value
1:24,000 scale
from spatial join with eunion.shp (merged soils and quaternary geology data layers)
DSPOLY_CD
Depositional System Code
Quaternary Geologic Map of Connecticut and Long Island Sound Basin
text value
1:24,000 scale
from spatial join with eunion.shp (merged soils and quaternary geology data layers)
DEPOSITION
Depositional System
Quaternary Geologic Map of Connecticut and Long Island Sound Basin
text value
1:24,000 scale
from spatial join with eunion.shp (merged soils and quaternary geology data layers)
SMPOLY_CD
Surficial Materials Code
Quaternary Geologic Map of Connecticut and Long Island Sound Basin
text value
1:24,000 scale
from spatial join with eunion.shp (merged soils and quaternary geology data layers)
SURFMAT
Surficial Materials
Quaternary Geologic Map of Connecticut and Long Island Sound Basin
text value
1:24,000 scale
from spatial join with eunion.shp (merged soils and quaternary geology data layers)
MUSYM
The symbol used to identify the soil map unit
Natural Resources Conservation Service (NRCS)
text value
1:24,000 scale
from spatial join with eunion.shp (merged soils and quaternary geology data layers)
MUNAME
Correlated name of the map unit (field name for surveys in progress)
Natural Resources Conservation Service (NRCS)
text value
1:24,000 scale
from spatial join with eunion.shp (merged soils and quaternary geology data layers)
MUHELCL
The overall Highly Erodible Lands (HEL) classification for the mapunit based on the rating of its components for wind and water HEL classification
Natural Resources Conservation Service (NRCS)
text value
1:24,000 scale
from spatial join with eunion.shp (merged soils and quaternary geology data layers)
POINT_X
x coordinate
ESRI
numeric value
POINT_Y
y coordinate
ESRI
numeric value
EROSION_CA
Erosion category
compiler
1
Highly erodible soil and coarse grained erodible surficial materials
compiler
2
Highly erodible soil and finer grained erodible surficial materials
compiler
3
Erodible surficial materials
compiler
4
Highly erodible soil
compiler
1:24,000 scale
from spatial join with eunion.shp (merged soils and quaternary geology data layers)
Includes Erosion sites features such as general descriptions, geologic and soils conditions at selected erosion locations. Information encoded about these features includes x and y coordinates and standard cartographic symbology classification schemes. Use the AV_LEGEND attribute to symbolize features by type on a map. Use the comment to label features on a map. Additional related attribute data tables are not included with the distributed layer, but are available upon request.
Stone, J.R., Schafer, J.P., London, E.H. and Thompson, W.B., 1992, Surficial Materials Map of Connecticut, U.S. Geological Survey special map, 2 sheets, scale 1:125,000.
Stone, J.R., Schafer, J.P., London, E.H., DiGiacomo-Cohen, M.L., Lewis, R.S. and Thompson, W.B., 2005, Quaternary Geologic Map of Connecticut and Long Island Sound Basin, U.S. Geological Survey Scientific Investigaions Map 2784, 2 sheets, scale 1:125,000.
State of Connecticut, Department of Enviromental Protection
mailing and physical address
79 Elm Street
Hartford
Connecticut
06106-5127
USA
860-424-3540
860-424-4058
dep.gisdata@ct.gov
Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Connecticut Erosion Sites
Although this data set has been used by the State of Connecticut, Department of Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Environmental Protection as to the accuracy of the data and or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata.
Shapefile, Feature Class
ArcGIS
Zip file
http://www.ct.gov/deep
An online copy of the data may be accessed without charge.
The data distributor does not provide custom GIS analysis or mapping services. Data is available in a standard format and may be converted to other formats, projections, coordinate systems, or selected for specific geographic regions by the party receiving the data.
Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.
20111208
Long Island Sound Resource Center, a partnership between the State of Connecticut, Department of Environmental Protection and the University of Connecticut
Mary L. DiGiacomo-Cohen
mailing and physical address
Long Island Sound Resource Center, UConn Avery Point, 1080 Shennecossett Rd.
Groton
CT
06340
USA
(860) 405-9015
lisrc@uconn.edu
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile