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  1. Title: Juvenile Delinquents, Washington, D.C., 1935 (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of the historic paper map entitled: Spot map showing residences of juvenile delinquents in the District of Columbia as of July 1, 1935. Data furnished by Juvenile Court of the District of Columbia. It was published in 1936. Scale [ca. 1:19,200]. Base map 'Complete to June 13, 1933.' The image inside the map neatline is georeferenced to the surface of the earth and fit to the Maryland State Plane Coordinate System Meters NAD83 (Fipszone 1900). All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows location of juvenile delinquents' residences by race and sex. Shows also features such as block numbers and alley dwelling areas, roads, railroads and stations, drainage, selected public buildings and points of interest, parks, cemeteries, and more. This layer is part of a selection of digitally scanned and georeferenced historic maps from The Harvard Map Collection as part of the Imaging the Urban Environment project. Maps selected for this project represent major urban areas and cities of the world, at various time periods. These maps typically portray both natural and manmade features at a large scale. The selection represents a range of regions, originators, ground condition dates, scales, and purposes.

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  2. Title: Map of the District of Columbia

    Contributors:

    Summary: Extent: 1 map Abstract: Map of Washington, D.C., showing typhoid fever statistics classified by race in each of 53 numbered districts. Also shows locations of hospitals. Notes: Oriented with north to the upper left (north arrow not shown). Map detached from a United States House of Representatives document in the United States congressional serial set (5127 H.doc.8/3): Report of the Commissioners of the District of Columbia for the year ended June 30, 1906. Vol. III, Report of the Health Officer. Washington : Government Printing Office, 1907. Series transcription from: Report of the Commissioners of the District of Columbia for the year ended June 30, 1906. Vol. III, Report of the Health Officer. Includes index to hospitals. Scale approximately 1:24,600

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  3. Title: Map of the District of Columbia

    Contributors:

    Summary: Extent: 1 map Abstract: Map of Washington, D.C., showing death rates classified by race in each of 53 numbered districts. Also shows locations of hospitals. Notes: Oriented with north to the upper left (north arrow not shown). Map detached from a United States House of Representatives document in the United States congressional serial set (5127 H.doc.8/3): Report of the Commissioners of the District of Columbia for the year ended June 30, 1906. Vol. III, Report of the Health Officer. Washington : Government Printing Office, 1907. Series transcription from: Report of the Commissioners of the District of Columbia for the year ended June 30, 1906. Vol. III, Report of the Health Officer. Includes index to hospitals. Scale approximately 1:24,600

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  4. Title: Plano de Yerba Buena, Alta California (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced image of a site plan Plano de Yerba Buena, Alta California. For descr. see: Harlow, N. The Maps of San Francisco Bay ... 1850, no. 31.Pen-and-ink and watercolor on tracing paper.Oriented with north to right."No. 280, City of San Francisco, San Francisco, Exhibit no. 2 A.F., filed in office Aug. 20, 1853, Geo. Fisher." Shows drainage, settlements, etc. Relief shown pictorially. A scanned version of this map was georeferenced as part of the Imagined San Francisco project. This project traces the history of urban planning in San Francisco, placing special emphasis on unrealized schemes. Rather than using visual material simply to illustrate outcomes, Imagined San Francisco uses historical plans, maps, architectural renderings, and photographs to show what might have been. By enabling users to layer a series of urban plans, the project presents the city not only as a sequence of material changes, but also as a contingent process and a battleground for political power. Savvy institutional actors--like banks, developers, and many public officials--understood that in some cases to clearly articulate their interests would be to invite challenges. That means that textual sources like newspapers and municipal reports are limited in what they can tell researchers about the shape of political power. Urban plans, however, often speak volumes about interests and dynamics upon which textual sources remain silent. Mortgage lenders, for example, apparently thought it unwise to state that they wished to see a poor neighborhood cleared, to be replaced with a freeway onramp. Yet visual analysis of planning proposals makes that interest plain. So in the process of showing how the city might have looked, Imagined San Francisco also shows how political power actually was negotiated and exercised. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  5. Title: MassGIS 2000 Massachusetts Senate Legislative Districts (1993)

    Contributors:

    Summary: The Massachusetts State Senate Legislative Districts (1993) datalayer reflects the State Senate district boundaries as defined by Chapter 274 of the Acts of 1993. The name of the statewide datalayer is SENATE93. Names of elected officials are up-to-date through March 1997.

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  6. Title: Boston, Massachusetts, proposed tide mills, 1814 (Raster Image)

    Contributors:

    Summary: This layer is a georeferenced raster image of the historic paper map entitled: A plan of those parts of Boston and the towns in its vicinity : with the waters and flats adjacent which are immediately or remotely connected with the contemplated design of erecting perpetual tide-mills, published by Benjamin Dearborn, 1814. It was originally issued with Massachusetts House Document no. 18 of June 1814 -- petitions to incorporate Boston and Roxbury Mill Corp. Scale [1:15,840]. Covers portions of Boston, Brookline, Cambridge, and Somerville. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Massachusetts State Plane Coordinate System, Mainland Zone (in Feet) (Fipszone 2001). All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, or other information associated with the principal map. This map shows features such as selected roads (existing and proposed), propsosed tide mills and dams, drainage, canals, bridges, and more. This layer is part of a selection of digitally scanned and georeferenced historic maps of Massachusetts from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of regions, originators, ground condition dates (1755-1922), scales, and purposes. The digitized selection includes maps of: the state, Massachusetts counties, town surveys, coastal features, real property, parks, cemeteries, railroads, roads, public works projects, etc.

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  7. Title: Map of the District of Columbia showing location of schools

    Contributors:

    Summary: Extent: 1 map Abstract: Map of Washington, D.C., showing public schools classified by race ("white schools" and "colored schools"). Notes: Relief shown by contours. Oriented with north to the upper left. Map detached from a United States House of Representatives document in the United States congressional serial set (5127 H.doc.8/4): Report of the Commissioners of the District of Columbia for the year ended June 30, 1906. Vol. IV, Report on Board of Education. Washington : Government Printing Office, 1907. Series transcription from: Report of the Commissioners of the District of Columbia for the year ended June 30, 1906. Vol. IV, Report on Board of Education. Includes notes. Scale approximately 1:22,500

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  8. Title: Map of the city of Washington showing location of fatal cases of consumption for the year ended June 30, 1901

    Contributors:

    Summary: Extent: 1 map Abstract: Map of central Washington, D.C, showing locations of deaths from tuberculosis ("consumption") classified by race ("white" and "colored"). Also shows block numbers. Notes: Map detached from a United States House of Representatives document (Serial Set 4302 H.doc.7): Report of the Commissioners of the District of Columbia for the year ended June 30, 1901. Includes directory of "Width of streets and avenues.". Scale approximately 1:13,670

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  9. Title: Senate Districts Massachusetts 2002

    • Polygon data
    • 2008
    Contributors:

    Summary: The Massachusetts Senate Legislative Districts (2002) datalayer reflects the state Senate district boundaries as defined by Massachusetts General Laws, Chapter 57: Section 3. These 40 districts are those used in the Fall 2002 elections. Names of elected officials are up-to-date as of March 2008. This replaces the older Senate District 1993 layer.

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  10. Title: LiDAR-Derived Bare Earth DEM for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), WI 2021

    Contributors:

    Summary: This data represents a LiDAR-derived bare earth Digital Elevation Model (DEM) for the Milwaukee Metropolitan Sewerage District (MMSD), Wisconsin in 2021. This dataset contains a single file covering the geographic extent of the entire county.

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  11. Title: LiDAR-Derived Digital Surface Model (DSM) for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), WI 2021

    Contributors:

    Summary: This data represents a LiDAR-derived digital surface model (DSM) for the Milwaukee Metropolitan Sewerage District (MMSD), Wisconsin in 2021. A Digital Surface Model captures both the natural and built/artificial features of the environment.

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  12. Title: LiDAR-Derived Hydro-Enforced DEM for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), WI 2021

    Contributors:

    Summary: This data represents a LiDAR-derived hydro-enforced Digital Elevation Model (DEM) for the Milwaukee Metropolitan Sewerage District (MMSD), Wisconsin in 2021. This dataset contains a single file covering the geographic extent of the entire county.

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  13. Title: LiDAR-Derived Breaklines for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), WI 2021

    Contributors:

    Summary: This data represents LiDAR-derived breaklines for the Milwaukee Metropolitan Sewerage District (MMSD) in 2021. Hydro breaklines maintain the definition of water-related features in an elevation model. They are used to capture linear discontinuities in the surface, lake shorelines, single-line drains for small rivers, and double-line drains for large rivers.

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  14. Title: LiDAR-Derived Buildings (3-D) for the Milwaukee Metropolitan Sewerage District (MMSD), WI 2021

    Contributors:

    Summary: This data represents buildings (3-D) for the Milwaukee Metropolitan Sewerage District (MMSD) in 2021. [3-D Building Models representing every building in Milwaukee County, WI present in the 2020 lidar survey. Models are based a standardized feature extraction algorithm using esri software. There are roughly 3 levels of detail present in the dataset: Level of Detail (LOD) 1 (simple/prismatic buildings with flat roof detail), LOD 2 (includes roof structure details such as hip and gable roofforms), LOD 3 with several iconic buildings modeled to to mimic their real-world aesthetic (examples are: US Bank Building, Miller Park, and Milwaukee City Hall). Highlights of the model include the differentiation of building components including roof, facades, and ground plane. Data is made available as a single Multipatch feature class consisting of over 400,000 individual building models.]

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  15. Title: LiDAR-Derived Culverts (Lines) for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), WI 2021

    Contributors:

    Summary: This data represents LiDAR-derived culverts (lines) for the Milwaukee Metropolitan Sewerage District (MMSD) in 2021. [3D culvert lines and points were generated from lidar bare earth DEM's and 2020 WROC 12 inch stereoimagery. During extraction a degree of user interpretation was necessary in determining culverts versus other similar cultural features. The Lidar base project DEM will be hydro flattened but not hydro-enforced which is typically used on water and flood modeling. To hydro enforce the DEM, we will collect culvert locations across the county. These culvert lines will then be draped to the Lidar point cloud, and the lowest elevation will be applied to the line. We will use the resulting 3D breakline to reclassify the ground points and cut the DEM, allowing water to flow through the culverts, rather than dam against the road bank. This is useful for hydro modeling and land conservation planning across the county.]

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  16. Title: LiDAR-Derived Culverts (Points) for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), WI 2021

    Contributors:

    Summary: This data represents LiDAR-derived culverts (points) for the Milwaukee Metropolitan Sewerage District (MMSD) in 2021. [3D culvert lines and points were generated from lidar bare earth DEM's and 2020 WROC 12 inch stereoimagery. During extraction a degree of user interpretation was necessary in determining culverts versus other similar cultural features. The Lidar base project DEM will be hydro flattened but not hydro-enforced which is typically used on water and flood modeling. To hydro enforce the DEM, we will collect culvert locations across the county. These culvert lines will then be draped to the Lidar point cloud, and the lowest elevation will be applied to the line. We will use the resulting 3D breakline to reclassify the ground points and cut the DEM, allowing water to flow through the culverts, rather than dam against the road bank. This is useful for hydro modeling and land conservation planning across the county.]

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  17. Title: LiDAR-Derived Depressions for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), WI 2021

    Contributors:

    Summary: This data represents LiDAR-derived depressions for the Milwaukee Metropolitan Sewerage District (MMSD) in 2021. [Closed depressions are important features in the landscape and knowing their locations aid in the understanding of topics ranging from water recharge to water quality and flooding. A series of automated routines were used to map closed depressions over 0.1 acres in size throughout Milwaukee County. The 2021 culvert inventory and 2021 hydro-enforced DEM were used to develop the closed depressions. ArcGIS Pro with Spatial Analyst Extension software was utilized to extract depressions from the hydro-enforced DEM. The initial step was to create a raster with filled depressions from the hydro-enforced DEM. The filled raster was then combined with the original DEM using a maximum operator creating a mosaic raster. The mosaic raster accounts for all depressions, but eliminates digital trenches located at culvert locations from the hydro-enforced DEM. The original DEM was then subtracted from the mosaic raster to extract depressions. Depression depths greater than 1 inch were then extracted. The greater than 1 inch depth raster was used to convert depression areas to polygons. Polygons greater than 0.1 acres were selected for the final closed depression dataset. The layer is intended to represent the greatest extent of individual surface depressions regardless of the degree of drainage at each setting. The depressions file can be shaded to show depth. A low elevation point layer was created for each depression and includes a depth value at the low point. A boundary polygon shapefile of closed depressions was generated including an acreage value. Closed depression mapping is influenced by project boundaries. Depressions that intersect the edge of the project boundary will either be partially filled to the height of the low point of the depression at the boundary, or not filled at all in cases where depression bottoms are flat and extend beyond the boundary. Lidar collection buffer areas improve the mapping accuracy of depressions within the subject county.]

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  18. Title: LiDAR-Derived Tiled Bare Earth DEM for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), WI 2021

    Contributors:

    Summary: This data represents LiDAR-derived tiled bare earth digital elevation model (DEM) for the Milwaukee Metropolitan Sewerage District (MMSD), Wisconsin in 2021. A DEM represents the bare earth surface, removing all natural and built features.

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  19. Title: LiDAR-Derived Tiled DSM for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), WI 2021

    Contributors:

    Summary: This data represents LiDAR-derived tiled digital surface model (DSM) for the Milwaukee Metropolitan Sewerage District (MMSD) (covering all of Milwaukee County) Wisconsin in 2021. A Digital Surface Model captures both the natural and built/artificial features of the environment.

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  20. Title: LiDAR-Derived Classified LAS for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), WI 2020

    Contributors:

    Summary: This data represents LiDAR-derived classified LAS points for Milwaukee County and the Milwaukee Metropolitan Sewerage District (MMSD), Wisconsin in 2020. Point classification uses semi-automated techniques on the point cloud to assign the feature type associated with each point. LiDAR points can be classified into a number of categories including bare earth or ground, top of canopy, and water. The different classes are defined using numeric integer codes in the LAS files

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