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Historical Aerial Photography CD Roms 1962 The statewide graphic
Photo Index was prepared using GIS software (ESRI ArcView) and RIGIS data.
The images for 1962 are contained on two separate CDROMs; 62North and
62South. Computer viewing software provided on this CDROM is courtesy of
LizardTech Inc. of Seattle, Washington, U.S.A. A separate photoindex in html
format for the CDROMs, 62North and 62South, are linked to corresponding
images for Rhode Island. To view the linked images install the provided MrSID_GeoViewer_setup.exe
software and open the HTML document. Then click on any index box to view the corresponding
image. Photo numbers were
derived from the photo number of each original photograph. Photo index outline
limits are approximate. Aerial photography in Rhode Island for 1962 was
captured by Aero Service Corp, Philadelphia, PA and donated to the archived
collection of photography at Statewide Planning. The original photography
used for this project consisted of 937 - 9” X 9” photographs at a photo scale
of 1” = 1320’ produced using standard airborne photogrammetric techniques in
February and April 1962. Actual dates along with a photo identification
number were imprinted on each of the photographs. Approximately every other image was used to create the
1962 indexes, utilizing 458 images.
For this project two separate index CDROM products have been produced,
one for northern and southern Rhode Island, providing full coverage for the
state. Each of the CDROM
contains one of the two indexes, which then have a row of overlap with the
bordering indexes. The 62North
index contains 230 images and the 62South index contains 243 images. Scanning
of the original photopositive images was done under contract with equipment
provided and operated by consultants at the Statewide Planning Offices in
Providence in November of 2000 while 32 photopositive images numbered 4_6103,
8_3539, 9_3570 to 9_3578, 9_3582 to 9_3606, 10_3610 to 10_3624, 10_3648,
11_606, 13_502, and 18_4243 were scanned by an intern at the Statewide
Planning office in Oct 2002. Reduction of the scanned product to TIF image
file format and compression to MrSID images was completed at the consultants’
facilities in Billerica, Massachusetts and Silver Spring, Maryland with the
exception of the previously
mentioned 32 photopositive images.
Those 32 photos were compressed in house in Oct 2002. Individual prints were scanned on
flat bed scanners using commercially available software and microcomputers
with MSWindow operating systems.
The scanning rate selected was 400 dots per inch (dpi) with 8 bit gray
(standard) and software default settings selected. Resulting scanned images were saved to Tagged Image File
(tif) format. The tif images
were then compressed at a 5:1 ratio with LizardTech MrSID Geospatial Encoder
1.4 and saved with file names corresponding to the same photo numbers
imprinted on the photos.
Indexing and transfer of data to CDROM media was conducted at the
Rhode Island Department of Administration, Statewide Planning Program by
state employees in Oct 2002.
Software For those who are
not already GIS users or who lack the specialized software required for
extended GIS analysis, we have included Lizardtech's MrSID GeoViewer. This
program is also available for free over the world wide web and can be
accessed at http://www.lizardtech.com/.
Please consult the accompanying license for any questions concerning this
program's usage.
If you do not
already have Arcview or another application that supports the MrSID image
format, you will need to install the MrSID GeoViewer software on your
computer.
MrSID GeoViewer is
a very small installation. It requires only the following: Windows
Power Macintosh
Additionally, please note that ESRI's Arcexplorer (2.0) supports the MrSID image format. Arcexplorer is a free GIS data viewer available from ESRI. For information about other GIS and image processing software with which to view MrSID images, please see http://www.lizardtech.com/. About
RIGIS The Rhode Island
Geographic Information System (RIGIS) is a consortium of government and
private organizations employing computer and communications technology to
manage and use a collective database of comprehensive geographically related
information. The mission of the RIGIS is to monitor, coordinate, and provide
leadership for activities related to the use of GIS technology within Rode
Island, to support initiatives to implement or use the technology, and to
manage and provide access to a common database of geographically referenced information. The RIGIS
database is maintained on a server at the University of Rhode Island's
Kingston Campus, and at the Rhode Island Department of Administration
in Providence. The Environmental Data Center within the Department
of Natural Resource Sciences at the University provides on line access
(web-browser only) to most RIGIS data via the Internet at www.edc.uri.edu/RIGIS. Data can also
be provided on magnetic and optical media by request from the RIGIS
coordinator at the RI Department of Administration's Statewide Planning
program at rigis@admin.ri.gov. RIGIS data are
copyright protected and licensed for use by the RI Board of Governors for
Higher Education. Restrictions include prohibiting the secondary distribution
of RIGIS data without prior written approval. RIGIS Contact
Information: John
Stachelhaus-RIGIS Coordinator
email:
rigis@admin.ri.gov
telephone: (401)
222-6483 |