Denver Regional Council of Governments (DRCOG), Denver Regional Council of Governments (DRCOG)
Sidewalk Line 2016
vector digital data
DRCOG Denver Region Urbanized Project Area
Denver Regional Council of Governments
This metadata describes this dataset which was formed by combining DRCOG’s Planimetrics 2014 Centerline Sidewalks data with the City and County of Denver’s inventory of sidewalks and landscape buffers from past curb and gutter inventories.DRCOG’s Planimetrics 2014 Centerline Sidewalks Data includes stereocompiled paved sidewalk and paved trail centerlines feature of DRCOG’s Denver Region Urbanized Project Area. The data was compiled from the Denver Regional Aerial Photography Project (DRAPP) 2016 Aerial Imagery Acquisition and Production. This 1"=100' scale imagery is comprised of 4-band RGBIR color orthoimagery with a GSD (Ground Sample Distance) of 0.5'. Imagery was collected with the Leica ADS40 and ADS80 digital sensors and processed with Leica XPro software. Imagery is projected in State Plane Coordinate System, Colorado central zone using the Lambert Conformal Conic map projection parameters. Horizontal and vertical datums are NAD83(11) and NAVD88(GEOID12A) respectively.The City and County of Denver’s curb and gutter inventory has been performed over multiple years and has collected information on sidewalk and landscape buffers where possible. The City also used a manual QA/QC process to verify sidewalk and landscape buffer widths on arterial streets. Collector and local street data was added using a script that converted DRCOG’s Planimetrics data to segment-level attribute data.
Delineates paved sidewalks (including sidewalk width and landscape buffer width), crossings and paved trails (including width). Sidewalks are paved walks for pedestrians, “Point A to Point B” use. Crossings are connections between two sidewalks across the roadway. Trails in this layer are public paved walkways intended for recreational purposes.
Capture criteria: If the sidewalk widens and the centerline shifts, create a "jig" to keep the centerline connected. The sidewalk does not stop at intersections or at parking aprons or at driveways, BUT these areas should be separate segments within the line feature and attributed differently (see attribution:Type). The main goal of this feature dataset is connectivity; it will be used for routing and modeling of pedestrian trips. When connecting "sidewalk"segments with an "other crossing" segment (see attribution: Type), only connect with there is visible access between the two sidewalk segments. Access means that a wheelchair can traverse it (so stairs do not constitute a connection). For sidewalk centerlines meeting parking apron, the portion of sidewalk centerline within the apron always breaks into a different line segment, and has a type of "other crossing" unless the sidewalk crossing the parking lot is readily visually apparent, in which case the sidewalk centerline simply continues unbroken. For sidewalk centerlines meeting driveway apron, the sidewalk continues as with the polygon sidewalks. This layer includes all public sidewalks (e.g. adjacent to a public building, schools, or roads, adjacent to commercial buildings, maintained by a public entity) and trails (e.g. in public parks, maintained by a public entity). The sidewalks layers will not include private sidewalks (i.e. serving individual residences, contained within campuses, mails or commercial complexes) EXCEPT where the sidewalk maintains connectivity with the public sidewalk network. In these instances, if the private sidewalk is too complex (i.e. multiple, indirect paths, or with many branches), a best-fit line may be drawn to maintain connectivity with the public sidewalks. Break all sidewalk and trail centerlines at line intersections.
digital aerial image
paved sidewalks and paved trails centerlines
ISO 19115 Topic Categories
ISO 19115 Topic Categories
ACCESS CONSTRAINTS: None. USE CONSTRAINTS: The City and County of Denver is not responsible and shall not be liable to the user for damages of any kind arising out of the use of data or information provided by the City and County of Denver, including the installation of the data or information, its use, or the results obtained from its use. ANY DATA OR INFORMATION PROVIDED BY THE City and County of Denver IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Data or information provided by the City and County of Denver shall be used and relied upon only at the user's sole risk, and the user agrees to indemnify and hold harmless the City and County of Denver, its officials, officers and employees from any liability arising out of the use of the data/information provided. NOT FOR ENGINEERING PURPOSES
This project was funded by various City and County of Denver departments for use in Denver Moves Pedestrians & Trails and subsequent planning efforts.
Available to the public and accessible through Denver's Open Data Catalog http://data.denvergov.org
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.4.1.5686
There are no Attributes in this data set.
Compliance with the collection and accuracy standard was ensured by the placement of GPS ground control prior to the acquisition of aerial imagery. A softcopy aerotriangulation adjustment is performed on the aerial imagery is Leica XPro software. Accuracy of the stereo compiled features is a function of the aerotriangulation accuracy as summarized by the X, Y, Z RMSE statistics of the ground control points.
Completeness is ensured in the final vector editing process by comparison to the 2014 digital orthoimages as a backdrop to the paved sidewalks and paved trails centerlines vector features.
The horizontal accuracy of the delivered paved sidewalks and paved trails centerlines features is a function of the aerotriangulation accuracy as expressed by the X and Y RMSE statistics of the ground control. DRCOG stated accuracy requirement (AppendixB_Feature Requirements_20151002.xlsx) is National Map Accuracy Standard (NMAS) for 1"=100' scale mapping. NMAS accuracy for map scales larger than 1:20000 horizontal tolerance is 1/30" for 90% of well defined points or, 3.0' horizontal accuracy. RMSE of the control is X = 0.108' and Y = 0.082'.
The Horizontal_Positional_Accuracy_Value was tested in accordance with Geospatial Positioning Accuracy Standards Part 3: National Standard for Spatial Data Accuracy (NSSDA), FGDC-STD-007.3-1998. NSSDA horizontal accuracy is 1.7308*RMSE_r or 1.7308*0.095 = 0.16'. NSSDA Horizontal accuracy of the aerotriangulated aerial imagery meets or exceeds the NMAS requirement of 1/30" for 1"100' scale mapping.
The paved sidewalks and paved trails centerlines were digitized in 2D from the aerial imagery and have no vertical attribute of accuracy value associated with X and Y values.
D WGS 1984
Centerline of paved sidewalks and paved trails.
Internal feature number.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
Date attribute is created.
Month, day and year the feature entity is created
Kucera International, Inc.
Kucera International, Inc.
Name of vendor creating the entity feature
Note field added for various purposes
A value of "Yes" indicates that a sidewalk is located on private property, a golf course or areas where access is limited.
City and County of Denver
is the sidewalk detached
Surface Type; Asphalt, Concrete, Stone
Length of feature in internal units.
Positive real numbers that are automatically generated.
FGDC Content Standard for Digital Geospatial Metadata