Abstract: Building polygons representing houses, businesses, mobile
homes, barns, silos and other buildings that could be determined
from aerial photography, using photogrammetric mapping
technologies and HouseDiff feature extraction process, updated
Purpose: This data set is intended for use as a reference map layer
for GIS maps and applications.
Currentness_Reference: publication date
Maintenance_and_Update_Frequency: As needed
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword_Thesaurus: CUGIR Category
Place_Keyword: Tompkins County, New York
Contact_Organization: Tompkins County ITS GIS Division
Browse_Graphic_File_Description: preview of the dataset
Data_Set_Credit: Tompkins County ITS GIS Division. Building data outside the
City of Ithaca originally vectorized by Hitachi Software. Original
orthoimagery (Color Infrared) from the NYS Office of Cyber Security
& Critical Infrastructure Coordination, 2002. City of Ithaca
data originally produced by NYSEG and subsequently updated by the
City of Ithaca Planning Department.
Native_Data_Set_Environment: Microsoft Windows Desktop 7 Professional Service Pack 1; ESRI
Logical_Consistency_Report: All polygons in this dataset is part of an ArcGIS geodatabase and
consistency is maintained using ArcGIS map topology and geodatabase
topology rules, then exported to a shapefile. Error checking is
performed in the source data set. Please keep in mind that this
dataset is not field checked and as with any features extraction
process there are going to be polygons that looked like buildings on
an aerial photo but are not in the field.
Completeness_Report: Complete for the entire county.
Horizontal_Positional_Accuracy_Report: Varies, depending on source of building footprint. The
accuracy of the data set ranges from the accuracy of the
1991 Tompkins County Planimetric Base Map series data in the
City to the accuracy of the 2002 aerial photos and later
Originator: Tompkins County ITS GIS Division
Originator: Hitachi Software
Title: Tompkins County Building Outlines (Shapefile :
Geospatial_Data_Presentation_Form: vector digital data
Publication_Place: Tompkins County, NY
Publisher: Tompkins County ITS GIS Division
Other_Citation_Details: Derived from 2002 Tompkins County orthoimagery
provided by NYS Office of Cyber Security &
Critical Infrastructure Coordination
Process_Description: In June of 2005, Tompkins County ITS GIS Division
entered into a contractual service agreement with Hitachi
Software to provide building footprint data from 2002
infrared Ortho Imagery using the Hitachi HouseDiff method.
for more info on HouseDiff. The result of this contract was
a shapefile of building footprints with 44,711 features
received by Tompkins County on August 3, 2005. As spelled
out in the contract Tompkins County had 30 days after
receipt to review the building footprints for errors and to
provide feedback to Hitachi Software before the deadline.
This deadline was extended to September 30, 2005 via a
letter from Hitachi Software received by Tompkins County on
September 2, 2005. The two parties agreed that feedback
would be provided in the form of a point shapefile
consisting of two fields; "status" and "comment." The values
for the "status" field are denoted in the enumerated domain
values for the "status" field under the Entity Attribute
section of the feedback point metadata. Comments were also
added when necessary. The data was derived via manual
inspection of each image tile from the countywide
orthoimagery dataset with the exception of those tiles
covering the City of Ithaca. Photographs were used by the
Tompkins County review team to detect differences in shape
and to help with missing buildings where applicable. The
building dataset was processed by Hitachi on a
parcel-by-parcel basis using 2002 County tax parcel data and
original 1991-1995 Planimetric Building footprint data.
Feedback (point shapefile) was sent to Hitachi, and a final
building footprint dataset with changes from the feedback
process was received on October 5, 2005. These buildings
were manually inspected by grid to make sure that the
buildings correlating to each feedback point were processed.
The resulting data file was copied and merged with the
buildings covering the City of Ithaca that are from the
original 1991-1995 Planimetric building footprint
Process_Description: Tompkins County ITS GIS Division staff updated
this buildings dataset for 2014, using several different
sources -- see the FPSOURCE field.
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Entity_Type_Definition: Building polygons representing houses, businesses,
mobile homes, barns, silos and other buildings that could be
determined from aerial photography, using photogrametric
mapping technologies and HouseDiff feature extraction
Entity_Type_Definition_Source: Tompkins County ITS GIS Division 2005.
Internal feature number.
Sequential unique whole numbers that are automatically
Common name assigned to a building usually for a
business or educational institution. Contents of field now
in places table.
General notes that specify location and other items of
Date the building polygon was created (for buildings
added in Fall of 2008 onwards)
Physical municipality in which building is located.
Used for filtering purposes.
Generic building id. Used in script.
Date the building polygon was last modified.
Source from which the building was derived.
Hand digitized from paper maps, descriptions,
blue-prints, or derived from field
Bulk raster to vector conversion such as 2005
Derided from 2008 LIDAR data.
Orthographic images provided by NYS digital
Othophotography program such as 2002 infrared and
2006 natural color images.
2006 Pictometry Ortho data
1991 Planimetric data
Surveyed in the field with electronic
instrumentation such as GPS, theodolite,
Generic building added as a place-holder until
more specific information becomes available
SWIS value for municipality where building is
ESRI building code from the Community Basemap
Building type from ESRI Community basemap project used
to color code buildings on the Community basemap
City of Ithaca data source values similar to the county
FPSOURCE schema but with numbers.
Label assigned to City of Ithaca buildings from their
Additional Label assigned to City of Ithaca buildings
from their export file.
Yes/ No value to indicate if building is part of City
General building layer or not.
Notes attached to buildings from City of Ithaca
Category id from City of Ithaca extract
Perimeter of polygon in feet.
Positive real numbers that are automatically
Area of polygon in square feet.
Positive real numbers that are automatically
Distribution_Liability: Cornell University provides these geographic data "as is". Cornell
University makes no guarantee or warranty concerning the accuracy of
information contained in the geographic data. Cornell University further
makes no warranty either expressed or implied, regarding the condition of
the product or its fitness for any particular purpose. The burden for
determining fitness for use lies entirely with the user. Although these
files have been processed successfully on computers at Cornell University,
no warranty is made by Cornell University regarding the use of these data
on any other system, nor does the fact of distribution constitute or imply
any such warranty.
Distribution_Liability: Tompkins County does not warrant the accuracy or completeness
of the information portrayed in this data. The end user of the data
and products derived from it agrees to accept the data "as is", with
the full knowledge that errors and omissions may exist. The end user
further agrees to hold harmless Tompkins County for any liability or
damages that may result from an improper or inappropriate use of the