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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
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.
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