GIS
COORDINATING COMMITTEE
Data Development TWG Work Plan
1999 Digital Orthophotography
August1998
A. Overview:
Acquire statewide color infrared digital orthophotography from aerial
photographs to be flown in 1999.
B. Background: The State of Georgia, through the Department of Community Affairs
(DCA), signed a Joint Funding Agreement (JFA) with the U.S. Department of
Interior - USGS and many other partners (Federal, State, and Local) to produce
Digital Orthophotography Quarter Quadrangles (DOQQs) statewide in 1995. DOQQs are highly accurate digital aerial
photographs with a spatial resolution of one-meter. These DOQQs were produced from 1993 National Aerial Photography
Program (NAPP) black and white imagery.
The DOQQs are being used widely throughout state, local, and private
organizations for a wide array of state business needs (appendix A).
The Data Development Technical Working Group
(DD-TWG), under the direction of Terry Jackson, DCA, conducted a needs
assessment for digital imagery and decided to participate in the next NAPP-3
program for Georgia. States were asked
to co-fund and cooperate with the NAPP steering committee to determine the type
of imagery needed for the state. If a
state does not cooperate, the federal government may or may not conduct the
flight. The DD-TWG also concluded that
Georgia should fly the state using color infrared film under leaf-off
conditions. The flight will take place
between December 1998 and March 1999.
This project will produce NAPP film and film positives that can be used
to produce a new set of color infrared DOQQs.
The GISAC and DD-TWG committees sought out partners to fund the NAPP-3 flight. The total cost to the State under a 50/50 cost share with the USGS was approximately $250,000. To fund the JFA with USGS five organizations contributed $50,000 each:
Department of Community Affairs and Atlanta Regional Commission
Department of Natural Resources
Department of Transportation
Georgia Forestry Commission
The NAPP-3 JFA between Georgia and USGS was executed
on June 25th 1998, by the Office of the Information Technology
Policy Council (ITPC). Georgia is on
schedule to have color infrared leaf-off aerial photographs completed by
mid-1999.
The DD-TWG also recommended that the state
investigate opportunities to develop DOQQs from this imagery. The committee had two main issues: 1) the
next generation DOQQs should be produced in a more timely fashion and 2) the
cost should be significantly less then the previous venture. Statewide coverage from 1993 DOQQs
(contracts executed in 1995 and 1996) were delivered on schedule. The committee desires to have new statewide
coverage completed in no more than 18-months from the contract date. The overall cost of the new DOQQs should be
30-40% less since much of the costly production of digital elevation models and
the collection of ground control was accomplished during the last project and
could be reused.
Methodology: There are two methods being investigated to produce second
generation DOQQs, image-to-image rectification and standard orthophotographic
production. Both techniques in theory will produce DOQQs that will
approximately match the previous set of DOQQs.
This is a desirable result since much of our state spatial data
infrastructure will be rectified to the 1993 imagery. Image-to-image rectification involves first scanning and
correcting imagery. Next photo
identifiable features from old and new imagery are identified and the new
imagery is warped to fit the old DOQQs.
Using standard techniques for second generation DOQQs, much of the
previous processing (old aerial triangulation, DEM, and ground control) can be
reused to develop the DOQQs.
Several National Digital Orthophotography Program (NDOPP) steering committee members feel that the image-to-image technique can produce a product at a lower cost than standard techniques. But this has not been proven and some speculate that the cost will be the same or possibly higher due to higher labor costs associated with finding photo-identifiable features. Currently the USGS has signed JFAs for second generation DOQQs using standard techniques and on a 50/50 actual cost match until then have a better fix on actual cost. The DD-TWG recommends that the state follow the lead of the USGS-NMD and enter into a JFA using their methodology to develop DOQQs.
Data Content
and Delivery Schedule: The data produced from this
project will have the following specifications:
Digital othophotography
derived from 1999 NAPP-3 color infrared leaf-off Imagery for Georgia.
Spatial resolution: One-meter
Spatial accuracy: Must meet National Map Accuracy Standards
for its scale.
Scale: 1:12,000
Tiling method: USGS quarter quadrangle
Projection: UTM and State Plane
Datum: NAD83
Units: Meters
Data Format: GeoTIFF
The delivery schedule will depend on the State of
Georgia having the necessary funds available to execute an agreement so that
our request can be queued in the heavy production cycle for the nation. If we submit one JFA versus several, as we
did in 1995, it may help speed the production and help in managing the
project. The tentative delivery
schedule for this database development project is as follows:
|
Milestone |
Date(s) |
|
NAPP flight |
December 1998 – March 1999 |
|
NAPP media available |
June 1999 |
|
Sign JFA with USGS |
July 1999 |
|
DOQQ Production |
August 1999 – December 2000 |
Budget: The USGS cost estimated to produce second generation DOQQs
is $750 per quarter quadrangle. They are developing a program where states
can cost share this development under their traditional 50/50 JFA. USGS has two contracts underway to help
determine the actual cost to produce second generation DOQQs. More accurate cost estimates will be
available in the coming year.
There are approximately 4,100-quarter quadrangles
that cover the State of Georgia.
Assuming the cost to Georgia to be 50% of the estimated cost of $750.00
per DOQQ or $350.00, the cost to the State of Georgia to produce a second
generation of DOQQs will be approximately; $1,537,500.00
($375 * 4,100).
The JFA to produce these new DOQQs should be
executed in fiscal year 2000. If GISCC
decides to support this data development partnership, the committee needs to
develop a state strategy to fund this project.
Maintenance
and Custodial Responsibility: This data
development project will not require any maintenance program. Any errors or problems with data will be
corrected by USGS-National Mapping Program.
The NAPP and NDOPP programs currently have a seven-year program for
imagery updates. The GIS Data
Clearinghouse will act as data custodian to aid in the distribution and
management of this project.
Contract
Organization: Department of the Interior, US Geological
Survey, National Mapping Division, Joint Funding Agreement.
Appendix A
1995-96 Joint Funding Agreement Members in Georgia-USGS DOQQ Program
Federal Agencies
Tennessee Valley Authority
USGS National Mapping Division
USDA Consolidated Farm Agency
Services
USDA Natural Resources
Conservation Service
Georgia State Agencies
Department of Community
Affairs
Department of Human Resources,
Division of Public Health- Flood Recovery Program
Forestry Commission
Emergency Management Agency
Department of Natural
Resources
Department of Transportation
Georgia Regional Development Centers
Georgia Mountains
Regional Development Center
Northeast Georgia Regional
Development Center
Southeast Georgia
Compiled
by GA Department of Community Affairs; July 1998
Organizations in Georgia Using 1993 NAPP & DOQQ Products
Federal Agencies
Georgia Cooperative Fish and
Wildlife Research Unit (National Biological Survey-
U.S.
Dept. of Interior)
Tennessee Valley Authority
USGS-Georgia Center for
Spatial Analysis Technologies
USGS National Mapping Division
USDA/NASS
USDA Natural Resources
Conservation Service
Georgia State Agencies
Department of Community
Affairs
Department of Human Resources,
Division of Public Health- Flood Recovery Program
Forestry Commission
Emergency Management Agency
Safe Dams Program - Department
of Natural Resources, Environmental Protection Division
Department of Transportation-
Office of Environment/Location
Department of Natural
Resources, Wildlife Resources Division - Natural Heritage Program
Department of Revenue
Georgia Regional Development Centers
Atlanta Regional Commission
Central Savannah River Area
Chattahoochee-Flint
Regional Development Center
Coastal Georgia
Regional Development Center
Coosa Valley
Regional Development Center
Georgia Mountains
Regional Development Center
Heart of
Georgia-Altamaha Regional Development Center
Lower
Chattahoochee Regional Development Center
McIntosh Trail
Regional Development Center
Middle Flint
Regional Development Center
Middle Georgia Regional
Development Center
North Georgia
Regional Development Center
Northeast Georgia Regional
Development Center
South Georgia Regional
Development Center
Southeast Georgia*
Southwest Georgia
Georgia Counties
Butts County Tax Assessors
Cherokee County Board of
Commissioners
Cobb County Water System
Crisp County Tax Assessors
Georgia Counties
Douglas County Board of
Commissioners
Forsyth County Department of
Information Technology
Harris County Board of Tax
Assessors
Macon-Bibb County Parks and
Recreation
Newton County Tax Assessors
Newton County Board of
Commissioners
Paulding County Board of Tax
Assessors
Paulding County Engineering
Department
Spalding County
Wilkinson County Board of Tax
Assessors
White County
Georgia Cities
City of Calhoun
City of Cartersville
City of College Park
City of Rome
Peachtree City
University System of Georgia
Center for Remote Sensing and
Mapping Science
Dalton College/Board of
Regents
UGA Institute for Community
and Area Development
UGA Institute of Ecology
UGA Institute for Technology
Outreach Services
Utilities
Georgia Power Land
Department Forestry
Georgia Power Company Land
Department
Commercial
Photo Science, Inc.
Pond and Company
ECC International
PBS&J
Other
The Nature Conservancy
West Georgia Drug Task Force
Compiled by GA Department of Community Affairs and the GA GIS Data Clearinghouse; July 1998