Scanning for TNRIS’ Historical
The TNRIS Ar-chive
• TNRIS’ long-term goal will be to have all of our historic imagery
scanned, georeferenced and available through the DataHub website.
• TNRIS started small scale scanning of its imagery around 2003-2004,
however, only recently have funds become available for mass
• This project has been on our wish-list for years.
• Logistically, implementation of this project had been a struggle.
• Funding for a large scale project was not available until FY 19.
• Ultimately, this pilot project was fully funded through remaining
What did we do?
• Our goal was to utilize all of our allotted $250,000 towards digitization of the
o We calculated this would cover about 100,000 frames of historic imagery and approximately 5,000 georeferenced
• The RDC identified 9x9 frames of historic gray scale and natural color imagery
that was deemed highest priority.
o First priority collections included urban collections, primarily USDA 1950 and earlier, and TXDOT collections post
o Secondary priority collections were those that covered reservoirs for use in future RDC applications.
• Scanning kicked-off with our StratMap contract partner AECOM on May 1, 2019
and concluded on August 1, 2019
• All imagery were scanned at 800 dpi
• All images were scanned in a TIFF format.
• All images were named based on their source, collection, date, frame
number, and size.
What were the
• Georeferenced imagery was left unaltered. This means that the images resolutions were not
resampled, and color depth was not adjusted.
• All images were georeferenced in WGS 1984 EPSG/WKID: 4326
• Georeferenced images used the Texas Orthoimagery Program (TOP) 1995/96 dataset as its
• All georeferenced Imagery was transformed to at least a 2nd order polynomial with no fewer with
6 control points per image.
• All georeferenced imagery possess a relative accuracy of ~5 pixels or less.
Are we getting more money? More
• The scanning project was successful with 107,000 new digital frames added to
our archive. With this first initiative, the RDC currently has digitized about 25% of
the TNRIS Archive.
• During the last legislative session, StratMap was appropriated funding for various
new priorities including additional scanning projects.
• Funding for these future projects will be spread across the FY 20/21 biennium.
• TNRIS is anticipating starting another scanning project in Spring 2020.
What we gained
This project helped influence a
large scale archive reorganization.
Based on the results of our re-org
efforts and this scanning initiative,
the RDC is in a better position to
intake and identify imagery and
help future iterations run more
TNRIS RDC is looking for 2 or 3 interns for the Fall to Summer Semesters
Please submit the following items via email
to Kathleen Mack
• Cover Letter
• Unofficial Transcripts
• 2 Professional or Academic References
• GIS Intern will assist in projects to
enhance the ability of TNRIS to
serve data to the public.
• Work is primarily focused within
the Research Distribution Center
and will focus on maintaining
Historic Archive and TNRIS
• Additional duties may include
fulfilling historical data orders
assisting our in-house consultants
with imagery orders, and providing
QC for incoming orthoimagery and
Lidar datasets as needed.
For more information or questions please come see us at the TNRIS booth