This polygon layer contains the two elective districts for congressmen in Cambridge in the United State Congress. This layer was created for general use by the Cambridge Election Commission and for public distribution. There are two congressional districts in Cambridge, one of which is in the middle of another one.

For more information and download links see:
http://www.cambridgema.gov/gis/gisdatadictionary/elections/elections_congressionaldistricts.aspx

This point layer contains the police stations within the City of Cambridge.

This point layer is are all of the Cobrahead street lights which will be replaced throughout the summer of 2014. There are other types of lights in the City which are not included in this GIS layer. Decorative street lights which will be replaced in 2015, and lights owned by others (DCR, Universities, & private) have not been verified for accuracy yet and will be included in a future update of this layer.

This dataset contains the Average Daily Traffic counts and AM and PM peak hour Traffic counts measured on various road segments in the City of Cambridge from 1972 to 2017. The counts in this data set reflect only vehicle counts. An Average Daily Count measures the number of vehicles for an entire day, or an average of several days. Automatic Traffic Recorders (ATRs) log every vehicle that passes in each direction and this data is used to calculate Average Daily Traffic volumes and AM and PM Peak Hour Traffic Volumes for the street. The Peak Hour is average highest number of vehicles recorded during the morning and evening peak hour. Not all streets have the same peak hour. For example, the peak hour for one street could be 5 pm to 6 pm, whereas a peak hour for another street could be from 5:15 pm to 6:15 pm. The peak hour for a street can also change from day to day. When counts are done for several days, the Peak Hour count is the average of the highest peak hour over those days.
Automatic Traffic Recorders (ATR’s) are rubber hoses temporarily affixed to the street. When a vehicle passes, a pulse of air passes through the hose and triggers an air switch in a recording device on the roadside. The recorder device is a small steel box powered by a battery. Air switch triggers are stored on board and later downloaded to a computer. Note: Traditional and older ATRs were not able to record bicycles, however, more recent ATR’s (past 5 to 10 years) have been able to record bicycles that pass over the recorder.

This layer contains point features of Youth Centers in Cambridge. Created for general use by City staff. Used for both mapping and specific identification of buildings with a similar use.

For more information and download links see:
http://www.cambridgema.gov/GIS/gisdatadictionary/Landmark/LANDMARK_YouthCenters.aspx

This dataset contains the Average Daily Traffic counts and AM and PM peak hour Traffic counts measured on various road segments in the City of Cambridge from 1972 to 2017. The counts in this data set reflect only vehicle counts. An Average Daily Count measures the number of vehicles for an entire day, or an average of several days. Automatic Traffic Recorders (ATRs) log every vehicle that passes in each direction and this data is used to calculate Average Daily Traffic volumes and AM and PM Peak Hour Traffic Volumes for the street. The Peak Hour is average highest number of vehicles recorded during the morning and evening peak hour. Not all streets have the same peak hour. For example, the peak hour for one street could be 5 pm to 6 pm, whereas a peak hour for another street could be from 5:15 pm to 6:15 pm. The peak hour for a street can also change from day to day. When counts are done for several days, the Peak Hour count is the average of the highest peak hour over those days.
Automatic Traffic Recorders (ATR’s) are rubber hoses temporarily affixed to the street. When a vehicle passes, a pulse of air passes through the hose and triggers an air switch in a recording device on the roadside. The recorder device is a small steel box powered by a battery. Air switch triggers are stored on board and later downloaded to a computer. Note: Traditional and older ATRs were not able to record bicycles, however, more recent ATR’s (past 5 to 10 years) have been able to record bicycles that pass over the recorder.

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https://www.cambridgema.gov/GIS/gisdatadictionary/Landmark/LANDMARK_PublicLibraries

Description
This layer contains point features of all public libraries in Cambridge. Created for general use by City staff. Used for both mapping and specific identification of buildings with a similar use.

About Edit Dates
This data is automatically updated on a set schedule. The Socrata edit date may not reflect the actual edit dates in the data. For more details please see the update date on the full metadata page or view the edit date within the data rows.

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https://www.cambridgema.gov/GIS/gisdatadictionary/Basemap/BASEMAP_Buildings

Description
City of Cambridge, MA, GIS basemap development project encompasses the land area of City of Cambridge with a 200-foot fringe surrounding the area and Charles River shoreline towards Boston. The basemap data was developed at 1" = 40' mapping scale using digital photogrammetric techniques. Planimetric features; both man-made and natural features like vegetation, rivers have been depicted. These features are important to all GIS/mapping applications and publication. A set of data layers such as Buildings, Roads, Rivers, Utility structures, 1 ft interval contours are developed and represented in the geodatabase. The features are labeled and coded in order to represent specific feature class for thematic representation and topology between the features is maintained for an accurate representation at the 1:40 mapping scale for both publication and analysis. The basemap data has been developed using procedures designed to produce data to the National Standard for Spatial Data Accuracy (NSSDA) and is intended for use at 1" = 40 ' mapping scale. Where applicable, the vertical datum is NAVD1988.

About Edit Dates
This data is automatically updated on a set schedule. The Socrata edit date may not reflect the actual edit dates in the data. For more details please see the update date on the full metadata page or view the edit date within the data rows.

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https://www.cambridgema.gov/GIS/gisdatadictionary/Landmark/LANDMARK_PublicSchools

Description
This layer contains point features of all Cambridge public schools. Created for general use by City staff. Used for both mapping and specific identification of buildings with a similar use. Also used by emergency responders for evacuation and if the school is a designated shelter.

About Edit Dates
This data is automatically updated on a set schedule. The Socrata edit date may not reflect the actual edit dates in the data. For more details please see the update date on the full metadata page or view the edit date within the data rows.

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https://www.cambridgema.gov/GIS/gisdatadictionary/Environmental/ENVIRONMENTAL_StreetTrees

Description
Trees and tree planting sites owned, planted or maintained by the City of Cambridge, the Massachusetts Department of Conservation and Recreation, and MIT, Harvard University and other private organizations. This layer is maintained by Cambridge Public Works. City owned and maintained trees. This layer is maintained by Cambridge Public Works and updated regularly by the City Arborist.

About Edit Dates
This data is automatically updated on a set schedule. The Socrata edit date may not reflect the actual edit dates in the data. For more details please see the update date on the full metadata page or view the edit date within the data rows.