Aerial photography digitization at MAGIC Overview

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




Outline

• Equipment

• Staffing

• Timelines

• Projects

• Providing Access

• Suggestions for the Future

• Q & A




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

http://www.epson.com/cgi-bin/Store/jsp/Product.do?BV_UseBVCookie=yes&sku=E10000XL-PH




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)




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?




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




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




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




PROVIDING ACCESS




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.




Shapefile




Metadata




Spreadsheet




kml open with google earth




Kml zoom in with download popup




Whole state

google map preview




Zoom in with download popup




Search by Address




FUTURE WORKFLOWS




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




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

http://www.digitizationguidelines.gov/




QUESTIONS?

Aerial photography digitization at MAGIC Overview

Education

Transcript of Aerial photography digitization at MAGIC Overview