Street centerline network for the City of Portland, Multnomah County, Clackamas County and Washington County developed for geocoding purposes. This dataset has a character (textual) street number field to better allow for locating addresses that have leading zeros (e.g., 0680 SW Bancroft St.). This dataset does not yet include the data fields and structure necessary for performing routing operations.--Additional Information: Category: Transportation - Streets Purpose: Provides a dataset including all address segments to be used for geocoding (locating) addresses in the Portland Region. Includes the capability to search those addresses whose street number begins with a zero.-- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=52067

Tile Download Link 2005 6" pixel resolution orthoimagery of South Portland from May 6, 2005. Provided by the Maine Office of GIS and the Maine GeoLibrary Board. As the prime contractor, Bradstreet Consultants, Inc. used the aerial photography flown in one session on May 6, 2005, by Richard Crouse & Associates, Inc. of Frederick, MD who acquired approximately 1335 photos @ 1"=600' with airborne GPS using a Wild RC-30 (#13261) aerial camera. Bradstreet Consultants, Inc. painted and repainted ground targets for photo survey control points (~200) to support full analytical aerotriangulation. The aerotriangulation solution was used to set up each stereopair of photos for orthorectification and DTM compilation. The ortho imagery was created by scanning (14 microns (um) per pixel or 1815 dpi) the original 1"=600' scale film and employing a digital terrain model (DTM) from updating some town's original DTM and some town's from scratch using the 1"=600' scale negatives or diapositives using both analytical and softcopy (digital) stereoplotter in the Kork KDMS format.

Maine Statewide Orthoimagery Project - During the spring of 2020 new 4-band (R, G, B, and NIR) aerial imagery was acquired covering the entire project area using Leica ADS digital camera systems. All imagery was collected during the 2022 spring flying season during leaf-off conditions for deciduous vegetation in the State of Maine. The sun angle shall be 25-degrees or greater, and streams should be within their normal banks, unless otherwise negotiated. During flight planning and acquisition, a significant effort is made to limit clouds, snow (please note: small amounts of snow such as piles in parking lots, extreme shaded areas, within dense evergreens or unpopulated northern facing slopes may be acceptable), fog, haze, smoke, or other ground obscuring conditions in the imagery. In no case will the maximum cloud cover exceed 5% per image. Within the immediate areas of power plants, factories, or controlled agricultural burns some steam or smoke and/or shadows may be visible on imagery. Woolpert produced new 8-bit, 4-band stacked color digital orthoimagery files in GeoTIFF format with TFW “world file” at a 45cm (18-inch), 30cm (12-inch), 15cm (6-inch) and 7.5cm (3-inch).The Maine GeoLibrary Board has developed a statewide, 5-year, rotating orthoimagery acquisition program for Maine to facilitate state, regional and local government GIS base mapping in an efficient and cost-effective program. The State of Maine will use digital orthoimagery for the development of various base map products in a computerized GIS that will support the needs of the state and multiple stakeholders through applications, such as, multi-jurisdictional homeland security mapping applications, state and county emergency management applications, regional and local planning, state and local public safety applications, economic development and other GIS business objectives.

Points representing the locations of verified active addresses in the Portland Metro Region. Addresses been culled from the City of Portland Master Address Repository, Multnomah County Assessor Records and the RLIS Master Address Points dataset.--Additional Information: Category: Address Purpose: For mapping, geocoding, mailing, and analysis of addresses in the Portland Metro Region. Update Frequency: Twice Weekly-- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=54157

The Maine Silver Jackets team developed a set of coastal flood risk data layers to support local resilience planning. The USACE New England District modeled three different storm intensities (10-yr, 25-yr, and 100-yr) based on historic analogues (Patriot's Day Storm of April 15-17, 2007; Bomb Cyclone of Jan 4-6, 2018; and the Blizzard of Feb 4-10, 1978), and four different sea level heights (0, 1.5, 3.0, 3.9, and 8.8 feet above current mean higher-high water, NTDE 1983-2001). Tides, sea level rise scenarios, and riverine discharges were added as boundary conditions to the Coastal Modeling System framework (CMS-Flow), a hydrodynamic model solving for depth-averaged circulation. This was coupled with a spectral wave transformation model, CMS-Wave, to compute wave statistics and account for wave setup within the model domain. The resulting model information was provided as sets of nodes, or points, representing grid cell centroids (easting and northing) and maximum water level values referenced to NAVD88. These sets of model nodes were post-processed by NOAA to generate a single set of clean, consistent, merged, and spatially-referenced points. The points were used to interpolate raster-based water surface elevation data which became the basis for inundation mapping. High resolution lidar-derived elevation data were compiled with breaklines representing shorelines and waterfront infrastructure to generate a physical representation against which the storm-generated water surface elevation data were compared. Inundation depth grids and flood extent polygons were produced as final data layers.

A layer showing GPCOG's 26 member communities: Bridgton, Cape Elizabeth, Casco, Chebeague Island, Cumberland, Cumberland County, Durham, Falmouth, Freeport, Frye Island, Gorham, Gray, Harrison, Long Island, Naples, New Gloucester, North Yarmouth, Portland, Pownal, Raymond, Scarborough, Sebago, South Portland, Standish, Westbrook, Windham, Yarmouth.

Lines representing the top of the South Waterfront riverbank (Willamette River). https://www.portlandoregon.gov/bps/article/53363-- Additional Information: Category: Zoning Code Purpose: Use for applying zoning restrictions and development requirements in the South Waterfront area of Portland. Update Frequency: As Needed-- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=52755

Feature class that compare the elevations between seawall crests (extracted from available LiDAR datasets from 2010 and 2013) with published FEMA Base Flood Elevations (BFEs) from preliminary FEMA DFIRMS (Panels issued in 2018 and 2019) in coastal York and Cumberland counties (up through Willard Beach in South Portland). The dataset included the development of an inventory of coastal armor structures from a range of different datasets. Feature classes include the following:

Feature class that compares the elevations between sand dune crests (extracted from available LiDAR datasets from 2010 and 2013) with published FEMA Base Flood Elevations (BFEs) from preliminary FEMA DFIRMS (Panels issued in 2018 and 2019) in coastal York and Cumberland counties (up through Willard Beach in South Portland).

Polygon representing an area of the River General (g) greenway overlay zone for South Waterfront development. https://www.portlandoregon.gov/bps/article/53363-- Additional Information: Category: Zoning Code Purpose: For mapping the General (g) overlay zone in South Waterfront. Update Frequency: As Needed-- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=52732

Streetscape standards for Airport Way and Marine Drive in Columbia South Shore plan district. https://www.portlandoregon.gov/bps/article/53364-- Additional Information: Category: Zoning Code Purpose: Special streetscape standards are intended to enhance and strengthen the image of the plan district; unify public and private improvements, and provide a safe, comfortable and attractive pedestrian environment. Update Frequency: Infrequent-- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=52754

This layer was developed by GPCOG based on information available in each transit agency's route maps, as well as the Southern Maine Transit Tracker website. The following transit agencies are included:METROSouth Portland Bus ServiceShuttlebus-ZOOMRTP's Lakes Region ExplorerCasco Bay LinesChebeague Transportation CompanyNNEPRA's Amtrak DowneasterThe routes in this layer are up to date as of 7/11/24 and to the best of our knowledge.

Line feature class which represents coastal engineering structures along coastlines of communities in York and Cumberland Counties, Maine, from Kittery to South Portland.

Set of all the USGS 24k Quadrangle maps that intersect Eaton County, Michigan.The quadrangles included are Aurelius, Bellevue, Charlotte, Chester, Dimondale, Duck Lake, Eagle, Eaton Rapids, Hoytville, Lansing North, Lansing South, Nashville, Needmore, Olivet, Onondaga, Portland South, Saubee Lake, Springport, Wacousta, and Woodbury. They are all the 2019 versions of the maps except Needmore, which is 2017. These maps were acquired by download from the National Map Viewer.https://www.usgs.gov/core-science-systems/ngp/tnm-delivery/ on 1/9/2020.

Willamette River Study Boundary by reach (North, Central, South Waterfront, South) for Planning purposes.-- Additional Information: Category: Boundary Purpose: Map river reach boundaries defined for River Environmental Planning. Update Frequency: Infrequent-- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=60873

Phragmites 1994 is a 1:12,000-scale, polygon feature-based layer that includes areas where phragmites existed in 1994 along the lower Connecticut River corridor from the towns of Portland and Cromwell south to Long Island Sound. This layer was published at the same time as the Phragmites 1968 layer in order to depict the historic differences in phragmites growth between 1968 and 1994. The Phragmites 1994 layer was compiled using 1:12,000 black and white digital orthophotos obtained from the Nature Conservancy of Connecticut. This data represents a particular point in time (1994). It is not updated and does not depcit current conditions. Features are polygon locations that represent the approximate location of phragmites growth in 1994. Attribute information is comprised of the NAME94 attribute that identifies one of 25 general locations of phragmites growth. Other attributes include AV_LEGEND that depicts the existence of phragmites, and ACREAGE that depicts the size of each polygon in acres. Data was compiled at a 1:12,000 scale.