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Scanning for TNRIS' Historical Imagery Archive

Scanning for TNRIS' Historical Imagery Archive

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  1. Scanning for TNRIS’ Historical Imagery Archive

  2. 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 scanning projects.
  3. Project Origins • 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 StratMap/TWDB funds.
  4. What did we do? • Our goal was to utilize

    all of our allotted $250,000 towards digitization of the TNRIS archive. o We calculated this would cover about 100,000 frames of historic imagery and approximately 5,000 georeferenced images. • 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 1950. 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
  5. Project Standards • 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.
  6. What were the specifications/standards/conventions? Cont.. • 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 reference source. • 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.
  7. Are we getting more money? More iterations? • 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.
  8. 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 efficiently.
  9. TNRIS RDC is looking for 2 or 3 interns for

    the Fall to Summer Semesters Application Process: Please submit the following items via email to Kathleen Mack (Kathleen.Mack@twdb.texas.gov) • Cover Letter • Resume • 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 applications • 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