Aerial photography digitization at MAGIC Overview
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Provides an overview of the workflows and considerations for digitizing aerial photography collections based on experience at MAGIC
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Aerial photography digitization at MAGIC Overview
- 1. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team DIGITIZING AERIAL IMAGERY: A 15,000 FT VIEW Presented by: Michael Howser & Jie Lin University of Connecticut Libraries MAGIC
- 2. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Outline • Equipment • Staffing • Timelines • Projects • Providing Access • Suggestions for the Future • Q & A
- 3. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Equipment - Scanning • Scanning • Flat bed scanners for aerial imagery 9” by 9” prints • Started with Microtek (model ???) which digitized nearly all of our aerial photography collections • Scanned in greyscale (for non-color prints) • Transitioned to the EPSON 1000XL
- 4. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Equipment - Photography • Photography • Overhead capture using digital SLR camera and camera stand • This method is utilized for archival materials • May provide better color replication and faster throughput when staffed by photographer • More expensive option Photo stand example from Miami University Libraries Digitization Lab (July 2013)
- 5. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Digitization Standards • Resolution • 300 DPI – used at MAGIC • 1200 DPI – images digitized by CT DEEP • Greater resolution = larger files but also enables greater detail when zoomed in and provides more information for printing • File Format • TIFF – uncompressed archival master • JPEG2000 – archival master • RAW (DNG) – option for photography captured materials • Derivatives for users • JPEG? • PDF? • Thumbnails?
- 6. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Staffing • Students • MAGIC utilized work study and student labor students to digitize materials • 10 hrs per week • Speed depends on student ability and equipment • Staff • Conduct QA/QC functions • Oversee digitization and coordinate student schedules
- 7. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Timeframe considerations • When using students productivity increases during summer and breaks, less during exams and midterms (generally) • Monotony of scanning can reduce motivation so need to revolve from scanning to other duties periodically • Aerial photos may be missing, have markings which need to be removed, or need preservation treatment before digitizing • Conduct tests to estimate time required to digitize a small batch to estimate completion timeframe
- 8. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Digitization Projects completed at MAGIC • 1951-1952 Aerial Photo collection (7 out of 8 counties coverage) • 1957 Aerial Photo collection (1 county) • 1963, 1967, 1969 (small area coverage) • 1970 Statewide • 1985-1986 Statewide • 1990 Statewide • 1995 Statewide
- 9. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team PROVIDING ACCESS
- 10. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Website • Offer users with multiple options to access aerial photo indexes • Each data derivative originates from the shapefile • A map preview option enables address searches using a Google Maps interface to locate and download individual images • Continue to expand on these offerings.
- 11. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Shapefile
- 12. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Metadata
- 13. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Spreadsheet
- 14. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team kml open with google earth
- 15. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Kml zoom in with download popup
- 16. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Whole state google map preview
- 17. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Zoom in with download popup
- 18. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Search by Address
- 19. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team FUTURE WORKFLOWS
- 20. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Changes to consider for the future Past • Scanned aerial photos and stored on CD/DVD • Scanned photos at 300 DPI • Combined air photo indexes in the 1960s into one collection • Used one flat bed scanner for all image scans Future • Scan images and deposit to our digital archive • Scan photos at 600-1200 DPI • Create separate indexes for each flight year then create interface to search • Streamline workflow by adding multiple scanners
- 21. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team Changes to consider for the future Past • Scanner was calibrated once • Scans were done in greyscale • QA/QC was done long after scans were completed • Students focused on one task (scanning) Future • Ensure equipment is FADGI 3-4 start compliant • Scan photos in full color rather than greyscale • QA/QC should be completed within 24-48 hours after scanning • Multiple tasks for students to improve output
- 22. University Libraries Digital Scholarship & Data Curation Team University Libraries Digital Scholarship & Data Curation Team QUESTIONS?