(Link to Metadata) This dataset is derived from the multi-resolution National Elevation Dataset (NED), at resolutions of both 1/3 arc-second (approx. 10 meters) and in limited areas, 1/9 arc-second (approx. 3 meters). Contours derived from this data may appear to have �shifted� when compared to the 7.5 minute USGS Quad Maps, i.e., Digital Raster Graphics, for a variety of reasons: 1) The NED is a multi-resolution dataset, e.g., areas with LiDAR source data have superseded the original "quad" contours; 2) A result of the original contour vectors undergoing a NAD27 to NAD83 conversion, then the contour vector-to-raster resampling that produced the initial grid, followed by a resampling of that initial 10m grid to the 1/3 arc-second NED (~10.29m) and finally the raster-to-vector conversion yielding the current contours. VCGI extracted the Vermont portion of the NED and re-projected into Vermont State Plane Meters NAD83 (vertical units in feet). Production artifacts were filtered out of this source data prior to acquisition resulting in a much-improved base of elevation data for calculating contours, slope and hydrologic derivatives. The NED is the primary elevation data product produced and distributed by the USGS. The NED provides the best available public domain raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands in a seamless format. The NED is derived from diverse source data, processed to a common coordinate system and unit of vertical measure. The source data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). The source elevation values are provided in units of meters, and are referenced to the North American Vertical Datum of 1988 (NAVD 88) over the conterminous United States. The NED is updated on a nominal two month cycle to integrate newly available, improved elevation source data.

description: (Link to Metadata) Used ElevationDEM_DEM10M and the Arc/Info HILLSHADE command with "Shade", "z_units = .3048", azimuth = 315 degrees and altitude = 45 degrees options to create this data layer. Input source dataset is derived from the multi-resolution National Elevation Dataset (NED), at resolutions of both 1/3 arc-second (approx. 10 meters) and in limited areas, 1/9 arc-second (approx. 3 meters). VCGI extracted the Vermont portion of the NED and re-projected into Vermont State Plane Meters NAD83 (vertical units in feet). Production artifacts were filtered out of this source data prior to acquisition resulting in a much-improved base of elevation data for calculating contours, slope and hydrologic derivatives. The NED is the primary elevation data product produced and distributed by the USGS. The NED provides the best available public domain raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands in a seamless format. The NED is derived from diverse source data, processed to a common coordinate system and unit of vertical measure. The source data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). The source elevation values are provided in units of meters, and are referenced to the North American Vertical Datum of 1988 (NAVD 88) over the conterminous United States.; abstract: (Link to Metadata) Used ElevationDEM_DEM10M and the Arc/Info HILLSHADE command with "Shade", "z_units = .3048", azimuth = 315 degrees and altitude = 45 degrees options to create this data layer. Input source dataset is derived from the multi-resolution National Elevation Dataset (NED), at resolutions of both 1/3 arc-second (approx. 10 meters) and in limited areas, 1/9 arc-second (approx. 3 meters). VCGI extracted the Vermont portion of the NED and re-projected into Vermont State Plane Meters NAD83 (vertical units in feet). Production artifacts were filtered out of this source data prior to acquisition resulting in a much-improved base of elevation data for calculating contours, slope and hydrologic derivatives. The NED is the primary elevation data product produced and distributed by the USGS. The NED provides the best available public domain raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands in a seamless format. The NED is derived from diverse source data, processed to a common coordinate system and unit of vertical measure. The source data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). The source elevation values are provided in units of meters, and are referenced to the North American Vertical Datum of 1988 (NAVD 88) over the conterminous United States.

(Link to Metadata) This data layers consists of 100 foot contours intervals interpolated from the USGS NED. USGS NED (National Elevation Dataset) data are described in the documentation for data layer ElevationDEM_DEM24. More information about the NED can be accessed by going to http://ned.usgs.gov

The Vermont Water Quality Standards (VTWQS) are rules intended to achieve the goals of the Vermont Surface Water Strategy, as well as the objective of the federal Clean Water Act which is to restore and maintain the chemical, physical, and biological integrity of the Nation's water. The classification of waters is in included in the VTWQS. The classification of all waters has been established by a combination of legislative acts and by classification or reclassification decisions issued by the Water Resources Board or Secretary pursuant to 10 V.S.A. � 1253. Those waters reclassified by the Secretary to Class A(1), A(2), or B(1) for any use shall include all waters within the entire watershed of the reclassified waters unless expressly provided otherwise in the rule. All waters above 2,500 feet altitude, National Geodetic Vertical Datum, are designated Class A(1) for all uses, unless specifically designated Class A(2) for use as a public water source. All waters at or below 2,500 feet altitude, National Geodetic Vertical Datum, are designated Class B(2) for all uses, unless specifically designated as Class A(1), A(2), or B(1) for any use.

description: (Link to Metadata) USGS RF 250,000 scale Digital Elevation Models are provided by the US Geological Survey. Generated from ElevationDEM_DEM250 using Arc/Info HILLSHADE command.; abstract: (Link to Metadata) USGS RF 250,000 scale Digital Elevation Models are provided by the US Geological Survey. Generated from ElevationDEM_DEM250 using Arc/Info HILLSHADE command.

(Link to Metadata) Mapping of the alpine tundra features on Mount Mansfield, Vermont. For this shapefile, alpine tundra is defined by three (3) features: Bare Rock, Alpine Vegetation (non-evergreen), and Subalpine Krummholz (evergreen). The coverage of the alpine tundra spans the Sunset Ridge Trail, the Maple Ridge Trail, and the portion of the Long Trail from the Mount Mansfield Forehead to the Mount Mansfield Adam's Apple. The shapefile was created through an object-based image analysis. Data sources include high-resolution 4-band imagery (Red, Green, Blue, Infrared) from the Vermont Imagery Program (0.2 meters, 0.5 meters) collected in 2013 during leaf-off conditions and the National Agriculture Imagery Program (1 meter) collected in 2014 during leaf-on conditions, and high-resolution elevation data (normalized digital surface model, digital elevation model) from the Vermont Lidar Program (0.7 meters) collected in 2014 during leaf-off conditions.

The United States has an average elevation of roughly 2,500 feet (763m) above sea level, however there is a stark contrast in elevations across the country. Highest states Colorado is the highest state in the United States, with an average elevation of 6,800 feet (2,074m) above sea level. The 10 states with the highest average elevation are all in the western region of the country, as this is, by far, the most mountainous region in the country. The largest mountain ranges in the contiguous western states are the Rocky Mountains, Sierra Nevada, and Cascade Range, while the Appalachian Mountains is the longest range in the east - however, the highest point in the U.S. is Denali (Mount McKinley), found in Alaska. Lowest states At just 60 feet above sea level, Delaware is the state with the lowest elevation. Delaware is the second smallest state, behind Rhode Island, and is located on the east coast. Larger states with relatively low elevations are found in the southern region of the country - both Florida and Louisiana have an average elevation of just 100 feet (31m) above sea level, and large sections of these states are extremely vulnerable to flooding and rising sea levels, as well as intermittent tropical storms.

This DEM image service was intentionally published with the default gray scale color ramp to support flexibility for the user. For details on how you can generate derivatives on the fly using this service, please watch the March 2017 webinar on how to use the new lidar imagery services via http://vcgi.vermont.gov/events/archive#webinar.

description: (Link to Metadata) This metadata applies to the following collection area(s): Eastern VT 2014 0.7m and related 'normalized' Digital Surface Model (nDSM). Created nDSM using the ArcGIS 'MINUS' command where each pixel represents the height above ground (not above sea level) and is calculated by subtracting the DEM from the DSM, with vertical units in meters. This metadata complies with the VT Geodata Portal format and applies to thematic layers with the same resolution (RESCLASS), e.g., 0p7m, 1m etc., and may include multiple data 'collection' efforts. For the original vendor metadata containing specific details on each collections 'point cloud' such as flight dates, nominal pulse spacing and RMSEz etc., see the 'All Available Lidar' Product page: (http://vcgi.vermont.gov/data/products/ALL-LDR_MIX_LIDAR_STATE_ALL). For an overview of the 'VCGI Lidar Program' please see 'http://vcgi.vermont.gov/lidar'.; abstract: (Link to Metadata) This metadata applies to the following collection area(s): Eastern VT 2014 0.7m and related 'normalized' Digital Surface Model (nDSM). Created nDSM using the ArcGIS 'MINUS' command where each pixel represents the height above ground (not above sea level) and is calculated by subtracting the DEM from the DSM, with vertical units in meters. This metadata complies with the VT Geodata Portal format and applies to thematic layers with the same resolution (RESCLASS), e.g., 0p7m, 1m etc., and may include multiple data 'collection' efforts. For the original vendor metadata containing specific details on each collections 'point cloud' such as flight dates, nominal pulse spacing and RMSEz etc., see the 'All Available Lidar' Product page: (http://vcgi.vermont.gov/data/products/ALL-LDR_MIX_LIDAR_STATE_ALL). For an overview of the 'VCGI Lidar Program' please see 'http://vcgi.vermont.gov/lidar'.

Link to the ScienceBase Item Summary page for the item described by this metadata record. Service Protocol: Link to the ScienceBase Item Summary page for the item described by this metadata record. Application Profile: Web Browser. Link Function: information

description: (Link to Metadata) This metadata applies to the following collection area(s): Windham County 2015 0.7m and related 'normalized' Digital Surface Model (nDSM). Created nDSM using the ArcGIS 'MINUS' command where each pixel represents the height above ground (not above sea level) and is calculated by subtracting the DEM from the DSM, with vertical units in meters. This metadata complies with the VT Geodata Portal format and applies to thematic layers with the same resolution (RESCLASS), e.g., 0p7m, 1m etc., and may include multiple data 'collection' efforts. For the original vendor metadata containing specific details on each collections 'point cloud' such as flight dates, nominal pulse spacing and RMSEz etc., see the 'All Available Lidar' Product page: (http://vcgi.vermont.gov/data/products/ALL-LDR_MIX_LIDAR_STATE_ALL). For an overview of the 'VCGI Lidar Program' please see 'http://vcgi.vermont.gov/lidar'.; abstract: (Link to Metadata) This metadata applies to the following collection area(s): Windham County 2015 0.7m and related 'normalized' Digital Surface Model (nDSM). Created nDSM using the ArcGIS 'MINUS' command where each pixel represents the height above ground (not above sea level) and is calculated by subtracting the DEM from the DSM, with vertical units in meters. This metadata complies with the VT Geodata Portal format and applies to thematic layers with the same resolution (RESCLASS), e.g., 0p7m, 1m etc., and may include multiple data 'collection' efforts. For the original vendor metadata containing specific details on each collections 'point cloud' such as flight dates, nominal pulse spacing and RMSEz etc., see the 'All Available Lidar' Product page: (http://vcgi.vermont.gov/data/products/ALL-LDR_MIX_LIDAR_STATE_ALL). For an overview of the 'VCGI Lidar Program' please see 'http://vcgi.vermont.gov/lidar'.

description: (Link to Metadata) This metadata applies to the following collection area(s): Chittenden County 2004 3.2m and related "normalized" Digital Surface Model (nDSM). Created "Normalized Digital Surface Model (nDSM) using the ArcGIS "MINUS" command where each pixel represents the height above ground (not above sea level) and is calculated by subtracting the DEM from the DSM, with vertical units in meters. This metadata complies with the VT Geodata Portal format and applies to thematic layers with the same resolution (RESCLASS), e.g., 0p7m, 1m etc., and may include multiple data "collection" efforts. For the original vendor metadata containing specific details on each collections "point cloud" such as flight dates, nominal pulse spacing and RMSEz etc., see the "All Available LiDAR" Product page: (http://vcgi.vermont.gov/warehouse/products/ALL-LDR_MIX_LIDAR_STATE_ALL). For an overview of the "Vermont LiDAR Initiative" please see "http://vcgi.vermont.gov/lidar".; abstract: (Link to Metadata) This metadata applies to the following collection area(s): Chittenden County 2004 3.2m and related "normalized" Digital Surface Model (nDSM). Created "Normalized Digital Surface Model (nDSM) using the ArcGIS "MINUS" command where each pixel represents the height above ground (not above sea level) and is calculated by subtracting the DEM from the DSM, with vertical units in meters. This metadata complies with the VT Geodata Portal format and applies to thematic layers with the same resolution (RESCLASS), e.g., 0p7m, 1m etc., and may include multiple data "collection" efforts. For the original vendor metadata containing specific details on each collections "point cloud" such as flight dates, nominal pulse spacing and RMSEz etc., see the "All Available LiDAR" Product page: (http://vcgi.vermont.gov/warehouse/products/ALL-LDR_MIX_LIDAR_STATE_ALL). For an overview of the "Vermont LiDAR Initiative" please see "http://vcgi.vermont.gov/lidar".

(Link to Metadata) This dataset is derived from the multi-resolution National Elevation Dataset (NED), at resolutions of both 1/3 arc-second (approx. 10 meters) and in limited areas, 1/9 arc-second (approx. 3 meters). Contours derived from this data may appear to have �shifted� when compared to the 7.5 minute USGS Quad Maps, i.e., Digital Raster Graphics, for a variety of reasons: 1) The NED is a multi-resolution dataset, e.g., areas with LiDAR source data have superseded the original "quad" contours; 2) A result of the original contour vectors undergoing a NAD27 to NAD83 conversion, then the contour vector-to-raster resampling that produced the initial grid, followed by a resampling of that initial 10m grid to the 1/3 arc-second NED (~10.29m) and finally the raster-to-vector conversion yielding the current contours. VCGI extracted the Vermont portion of the NED and re-projected into Vermont State Plane Meters NAD83 (vertical units in feet). Production artifacts were filtered out of this source data prior to acquisition resulting in a much-improved base of elevation data for calculating contours, slope and hydrologic derivatives. The NED is the primary elevation data product produced and distributed by the USGS. The NED provides the best available public domain raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands in a seamless format. The NED is derived from diverse source data, processed to a common coordinate system and unit of vertical measure. The source data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). The source elevation values are provided in units of meters, and are referenced to the North American Vertical Datum of 1988 (NAVD 88) over the conterminous United States. The NED is updated on a nominal two month cycle to integrate newly available, improved elevation source data.

(Link to Metadata) Used ElevationDEM_DEM10M and the Arc/Info SLOPE command with the "PERCENT_RISE" and ".3048" Z_unit options to create this data layer. Input source dataset is derived from the multi-resolution National Elevation Dataset (NED), at resolutions of both 1/3 arc-second (approx. 10 meters) and in limited areas, 1/9 arc-second (approx. 3 meters). VCGI extracted the Vermont portion of the NED and re-projected into Vermont State Plane Meters NAD83 (vertical units in feet). Production artifacts were filtered out of this source data prior to acquisition resulting in a much-improved base of elevation data for calculating contours, slope and hydrologic derivatives. The NED is the primary elevation data product produced and distributed by the USGS. The NED provides the best available public domain raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands in a seamless format. The NED is derived from diverse source data, processed to a common coordinate system and unit of vertical measure. The source data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). The source elevation values are provided in units of meters, and are referenced to the North American Vertical Datum of 1988 (NAVD 88) over the conterminous United States.

(Link to Metadata) VTHYDRODEM was created to produce a "hydrologically correct" DEM, compliant with the Vermont Hydrography Dataset (VHD) in support of the "flow regime" project whose goal it is to derive stream perenniality for the VHD through application of logistic regression techniques. Some very important notes about the data: 1)Produced specifically for hydrologic modeling purposes and elevation surface has been altered and should not be used for analyses requiring unmodified elevation values; 2) ELEVATION VALUES, i.e., "Z units", are in CENTIMETERS (details below); and 3) Source data spans a five year period where varying techniques were used. This may explain observed inconsistencies both between and within tiles (detailed in the Attribute Accuracy Report below). This dataset has elevation values present in the surface that accurately reflect the down gradient nature and location of surface water features, i.e. the VHD. This process is also known as "hydro-enforcement" or "drainage enforcement". It is largely unknown that the 1:24k scale National Elevation Dataset (NED) is not "hydrologically correct" in relation to the National Hydrography Dataset (NHD) vector data of the same scale, e.g., the flow paths in the NED surface are not perfectly coincident to those in the scale NHD surface water features. This fact precluded the use of the NED data for hydrologic modeling efforts and reaffirmed the need to create a new "hydrologically correct" DEM. All processing was done using ARCINFO workstation (v.8.3) commands. The ARCINFO "TOPOGRID" command was used to create VTHYDRODEM as it was specifically designed to create "hydrologically correct" digital elevation models (DEM's) from elevation, stream and lake data sets. Single line "1D" streams and lake/pond "2D" polygons, from the 1:5k scale VHD, were given priority over input elevation data in the interpolation process to ensure that the resulting data is "hydrologically correct". Both the VHD and VTHYDRODEM share a common base of the state digital orthophotos, ensuring their interoperability. The Triangulated Irregular Networks (TIN) method was not considered but interested readers should review West Virginia's approach http://www.wvgis.wvu.edu/stateactivities/wvsamb/elevation/topogrid_vs_tin.pdf. This report notes the advantages and disadvantages of each approach. It should be noted that the WV effort included more recent imagery, and a much tighter sampling interval of source data. Nonetheless, it makes a strong case for the TIN approach that should be considered in any subsequent DEM development efforts. The density of input points used to create VTHYDRODEM was lower than the 1:24k NED but the vertical accuracy of those points tested at a higher accuracy and these points were generated with less variability in technique than that of the NED (see http://gisdata.usgs.net/website/USGS_GN_NED_DSI/viewer.htm and check "production methods" under "Layers" for NED data sources and methods). Vertical accuracy was derived using the FGDC National Standards for Spatial Data Accuracy (NSSDA) standards. For the sake of comparison, VTHYDRODEM tested at 6.05 meters, vertical accuracy at the 95% confidence level, whereas, the 1:24k National Elevation Dataset (DEM_24) tested at 21.3 meters. VTHYDRODEM was created for a specific, in-house project to support hydrologic modeling activities using the 1:5k scale VHD. It was interpolated from: 1) the Vermont Mapping Program (VMP) "x, y, z" data known as the "DEM points" (originally used to georectify the state digital orthophotos); and 2) VHD surface water features. A 10-meter cell resolution was chosen for VTHYDRODEM as a balance between input data accuracy and practical considerations and does not necessarily reflect the accuracy of the input data. The 10-meter resolution of this dataset was chosen arbitrarily for reasons noted below and should not be confused with an accuracy of 10 meters. This data should not be confused with the "1/3 arc second" 10m NED data. The lower 10m cell resolution has the following advantages when compared to the existing 30m 1:24k NED: 1) Stream confluences (junctions) can be defined with a greater degree of precision; 2) Confluences in close proximity can be represented individually; 3) Smaller landscape features can be represented and larger ones in greater detail; 4) Exponential improvement in volumetric measurement and tripling of precision in linear measurement of derived vector features, e.g., a watershed boundary is composed of aggregated 10m, i.e., 3 cells equals 30m vs. 30m resolution where 3 cells equals 90m. Similarly the concept applies to volumetric measurements); and 5) Improved cartographic accuracy for derived vector features. NOTE! Elevation units, e.g., "Z units" are in CENTIMETERS. This seeming arbitrary decision has a number of advantages worth considering. The output grid can now be stored as an "integer" type grid while simultaneously preserving the precision of the input data to the nearest centimeter. Integer type grids require one-tenth the storage space and are consequently much faster to process, e.g., deriving watershed boundaries. While it is unlikely that the input data is accurate to the nearest centimeter, this approach allows for greater precision storage, improves the overall appearance of the DEM and precludes problems with the model's depiction of over land flow in hydrologic related analyses when compared to coarser vertical resolutions. This approach mirrors a trend among the USGS and its contractors, who are now producing DEM's with a vertical resolution of decimeters (0.1 meter) for the benefits outlined above.

This data set represents an overlay district of high elevation for the Town of East Montpelier, Vermont. Any land in town above 1,500 feet in elevation is included in this layer and is subject to development restrictions according to East Montpelier's zoning regulations adopted in 2009.

Much of New Hampshire and Vermont (combined area = 50 000 km ) has hilly to mountainous topography. Elevations range from 0 to 1900 m a.s.l. (average = 360 m), and many peaks exceed 1200 m. Mean annual precipitation increases strongly with elevation (adjusted for additional orographic effects and distance from moisture sources), as do mean monthly precipitation, snow depth, and snow water equivalents. Mean monthly temperatures decrease with elevation, largely masking latitudinal effects, and can be used with other information to show how potential evapotranspiration changes with elevation. These effects combine to produce strong elevational increases in mean annual streamflow and, more surprisingly, cause streamflow variability, both short term and annual, to decrease with mean drainage basin elevation. Low flows for a given exceedance probability increase markedly as mean basin elevation increases above 340 m.

Adopted: 11/27/2017. Overlay district GIS data layer. Models a municipality's overlay district and related information.

(Link to Metadata) Used ElevationDEM_DEM10M and the Arc/Info ASPECT command to create this data layer representing compass direction of the aspect (rounded to whole numbers). Input source dataset is derived from the multi-resolution National Elevation Dataset (NED), at resolutions of both 1/3 arc-second (approx. 10 meters) and in limited areas, 1/9 arc-second (approx. 3 meters). VCGI extracted the Vermont portion of the NED and re-projected into Vermont State Plane Meters NAD83 (vertical units in feet). Production artifacts were filtered out of this source data prior to acquisition resulting in a much-improved base of elevation data for calculating contours, slope and hydrologic derivatives. The NED is the primary elevation data product produced and distributed by the USGS. The NED provides the best available public domain raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands in a seamless format. The NED is derived from diverse source data, processed to a common coordinate system and unit of vertical measure. The source data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). The source elevation values are provided in units of meters, and are referenced to the North American Vertical Datum of 1988 (NAVD 88) over the conterminous United States.

(Link to Metadata) This metadata applies to the following collection area(s): Missisquoi Lower 2008 1.6m and related "normalized" Digital Surface Model (nDSM). Created "Normalized Digital Surface Model (nDSM) using the ArcGIS "MINUS" command where each pixel represents the height above ground (not above sea level) and is calculated by subtracting the DEM from the DSM, with vertical units in meters. This metadata complies with the VT Geodata Portal format and applies to thematic layers with the same resolution (RESCLASS), e.g., 0p7m, 1m etc., and may include multiple data "collection" efforts. For the original vendor metadata containing specific details on each collections "point cloud" such as flight dates, nominal pulse spacing and RMSEz etc., see the "All Available LiDAR" Product page: (http://vcgi.vermont.gov/warehouse/products/ALL-LDR_MIX_LIDAR_STATE_ALL). For an overview of the "Vermont LiDAR Initiative" please see "http://vcgi.vermont.gov/lidar".