Digitization – Creates
Digital Legacy Data (DLD)
Precision Capture is an absolute necessity -
If integrity is lost at the beginning of the process, it cannot
be regained.
Digitization:
The precision digital capture (at 4500 dpi)
using a high- resolution flatbed scanner with a tolerance of
.005” to meet ASME Y14.31-2014 "Undimensioned Drawings -
Engineering Drawing and Related Documentation Practices”.
The resulting digital files are delivered as tiff group 4, 300 dpi,
and suitable for management in JEDMICS/A-TEAM.
DLD – Digitized Legacy Data must meet accuracy standards
specified in DI-SESS82351A (shown on following page Taken from DI-SESS-82351A Section 3.3 e (pg 17))
e. Digitized Legacy Data
In addition to the requirements in section 3.3.b, legacy data is any
type of document developed in a non-electronic format (e.g., manual
drafting board created drawings on Mylar) or any type of document
which has been scanned into a raster image format and validated to
accurately represent the original non-electronic format. Once
scanned and validated, Legacy Data becomes Digitized Legacy
Data. The PDF documents shall be full text searchable.
Compression shall be Group 4 IAW TIFF Version 6 and non-wrap
format. The image density or resolution for raster images shall be
200 dots per inch (dpi), including raster PDF documents.
(1) Physical media drawings include both dimensional and scaled
drawings as well as un-dimensioned, one-to-one scale drawings. Undimensioned, one-to-one scale drawings include stable base media
such as PB artwork and Mylar mechanical design drawings such as
flat patterns, loft, and painting templates.
(2) After scanning, validation tests shall be done by overlaying prints
of the scanned image over the original media checking for exact
overlay and matches of grid lines, curves, other drawing details, and
possible distortion and deviation. As an acceptance criterion, an
exact overlay and match to the original without distortion and
deviation is required.