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Buildings Sauk County, WI YE2016

Identification Information

Citation
Title
Buildings Sauk County, WI YE2016
Originator
Sauk County
Publication Date
2017-03-23
Edition
Final
Geospatial Data Presentation Form
mapDigital
Abstract
This polygon data layer represents buildings in Sauk County, Wisconsin at year-end 2016. It is a feature class within the geodatabase, Sauk_Buildings_YE2016.gdb.[The creation of the subsequent building footprint data was executed to capture the existing ground conditions at a specific point in time using Stereo Imagery for the purpose of GIS analysis. GIS is a system of computer software, hardware, and data that allows a user to manipulate, analyze, and present information that is tied to a spatial location. Sauk contracted with the Sanborn Map Company to execute a collection of various buildings types that meet contract requirements.]
Purpose
This layer is intended for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. [Building polygons for Sauk, Wisconsin. For 1"=100' or (1:1200) source scale mapping (6" GSD imagery): all structures with roofs having a area of 100 square feet or greater are captured from the stereo photography as a polygon. Buildings are delineated by tracing the eave line of the structure for dwellings, businesses, houses, house trailers, garages, barns, and accessory structures.]
Supplemental Information
Augmented original metadata with UW-Madison specific elements. For complete metadata documentation, please visit http://data-saukgis.opendata.arcgis.com . This data was submitted to the UW geospatial archive in 2017. Content may be considered current as of December 31, 2016. It was published to the UW geospatial archive as part of the Wisconsin Department of Administration Land Information Program annual collection of public data for the year 2017.
Temporal Extent
Time Instant
2017-01-01T00:00:00
Bounding Box
West
-90.314838
East
-89.598954
North
43.643027
South
43.148049
ISO Topic Category
imageryBaseMapsEarthCover
structure
Place Keyword
Sauk County
Wisconsin
Place Keyword Thesaurus
GNS
Temporal Keyword
2015
April 2015
Theme Keyword
Polygon
Theme Keyword Thesaurus
FGDC
Theme Keyword
Buildings
Theme Keyword Thesaurus
LCSH
Resource Constraints
Use Limitation
[This data is meant for use by requested parties. This data cannot be used without express consent.]
Legal Constraints
Use Limitation
Although this data is being distributed by the University of Wisconsin-Madison, no warranty expressed or implied is made by the University as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the University in the use of this data, or related materials.
Other Restrictions
[Contact Sauk County for information about datasets. This data may be used be the requested party for stated purposes and should not be re-distributed.]
Status
completed
Maintenance and Update Frequency
notPlanned
Language
eng
Credit
Sauk County
Point of Contact
Contact
Sauk County
Delivery Point
505 Broadway St
City
Baraboo
Administrative Area
WI
Postal Code
53913
Country
US
Email
kfelton@co.sauk.wi.us
Phone
608-355-3240

Spatial Reference Information

Reference System Identifier
Code
7631
Code Space
EPSG
Version
9.1.1

Data Quality Information

Quantitative Attribute Accuracy Report
Lineage
Process Step
Description
[Several major processes were done before the Buildings were produced, namely: digital aerial photography, imagery processing and QC, softcopy aerial triangulation and QC, ortho-rectification and QC. Aerial Photography: Aerial Photography was acquired with Microsoft Ultracam Eagle family precision digital aerial mapping cameras April 13, 14, 18 and 23 of 2015. Aerial photography was flown at 8750-9400 feet ASL depending on the elevation of the area flown. Planes were deployed with gyro-stabilized mount and equipped with forward motion compensation, Airborne GPS and Inertial Measurement Unit (IMU). Using an UltraCam Eagle CameraGPS/IMU, mission data is processed together with simultaneously collected ground-based GPS base station data in forward and reverse directions. This precisely determines the aerial camera's position and orientation in the terrain (project) coordinate system and allows for correct orientation of the imagery. The photo mission was conducted under optimal atmospheric conditions and greater than 30 degree sun angle. Imagery and GPS/IMU data is downloaded from disc on the plane to disc on the ground.]
Process Step
Description
[The digital aerial imagery was transferred from the camera to a Mass Storage Unit (MSU) and shipped to Sanborn's main facility in Colorado Springs. Once downloaded, data is processed via Microsoft Ultramap software from the raw camera format to a 4-band unsharpened color image and a pan image. An application is executed that outputs the mid-exposure pulse for each image. At this point a POS file is processed as input to the Aerial Triangulation process. Raw camera data files are archived on LTO3 tapes. The imagery is processed using Intergraph PPS processing software to create a 3-band color image in natural color (RGB) format. The images are archived (on LTO3 tapes) and removed from system when orthophotography production has been completed.]
Process Step
Description
[Softcopy (Digital) Aerotriangulation: This task involved the densification of ground control points, measurement of photo coordinates, computation and block adjustment to solve for exterior orientation parameters of individual photographs necessary for ortho-rectification using new ground control locations surveyed by the Sanborn map company, along with a combination of photo-identifiable points and targeted points. The ground control points were measured in a fully digital environment using softcopy stereoplotters and tie points and passpoints automatically generated. Analytical aerotriangulation computations and adjustment were done using ZI Imaging's ISAT software, which is capable of performing bundle block adjustments using a rigorous least squares analysis, and possesses error detection and removal facilities, systematic error corrections for lens distortion, earth curvature, and atmospheric refraction. State-of-the-art software with highly sophisticated error-detection routines was used to perform the computation and bundle block adjustment. A trained aerial triangulation specialist analyzed both numerical printouts and graphical error vector output display to detect gaps or holes in the block due to missing tie points, pass points or ground control.]
Process Step
Description
[The stereo pairs were used to photogrammetrically extract building footprints. The data was loaded into Geodatabase format with attribution as required by the project. The data was then QC'd using Orthophothos checking for correct position, shape accuracy, and attribution.]
Process Step
Description
Exported original feature class into a new file geodatabase to maintain the original file format of the data and to conform to UW-Madison's data distribution plan.
Process Date
2017-08-07T00:00:00
Source
Title
Geodatabase
Originator
Sanborn Map Co., Inc.

Distribution Information

Format Name
File Geodatabase Feature Class
Format Version
10.3
Distributor
University of Wisconsin-Madison
Distributor
Sauk County
Online Access
https://gisdata.wisc.edu/public/Sauk_Buildings_YE2016.zip
Protocol
WWW:DOWNLOAD-1.0-http--download
Name
GeoData@Wisconsin
Function
download

Spatial Representation Information

Vector
Topology Level
geometryOnly
Vector Object Type
composite
Vector Object Count
72778

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
A1475998-DCB0-47E2-99BC-23C557B5D5DE
Metadata Point of Contact
Name
Arthur H. Robinson Map Library
Position Name
metadata technician
Delivery Point
550 N. Park Street
City
Madison
Administrative Area
WI
Postal Code
53706
Country
US
Email
askmap@library.wisc.edu
Phone
(608) 262-1471
Metadata Date Stamp
2017-08-24
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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