[OKGIS] Old aerial photos of OKC?

[Mike Sharp]

If you are trying to insert the latest MrSid format image files into
AutoCad Map you will need the Raster Design Object Enabler installed
(this also applies to plain AutoCad or other AutoCad products).  The
free download can be found at
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=7176069
&linkID=2786655 .  If you want to decode a MrSid image to a TIFF, BMP or
JPG(with various levels of compression) and at true color, 256 color
palette or gray scale color depth, download the free GeoExpress Viewer
from LizardTech at
http://www.lizardtech.com/download/dl_options.php?page=geo (scroll down
to GeoExpress View).  Under the tool menu select export.  The program is
a trial evaluation version and after 4 hours of use it requires
registration and purchase ($299).  Also, during the 4 hour time frame it
times out in 30 minutes so you have to restart it until the 4 hours is
used up.  I have not tried the command line decoder Scott referred to.

 

For example, I decompressed the 2006 NAIP Osage County mosaic into 9
tiles (3x3) of about 20-25 Mb/tile as a true color, compressed (10x) JPG
which took about 20 minutes or so on a dell Pentium 4, 2.13 GHz, 2 Gb
RAM laptop.  The results look pretty good.  If you care to see for
yourself, go to ftp://ftp.okcc.state.ok.us/gis/MrSid/Osage%202006/
<ftp://ftp.okcc.state.ok.us/gis/MrSid/Osage 2006/>  . This would be
quite useful if you only wanted to extract a small area out of a county
mosaic for a project.  Unfortunately, during this job I hit my 4 hour
limit but the program continued to run until the decompression task
ended.  Now I need to decide if I want to invest the $ 300 in upgrading
to the full, registered version or install it on another computer for
another 4 hours of use. 

 

By the way, if you are interested in decompressing MrSid files prior to
2005 (older MrSid format), I have made available the Win 95/NT Ver 2.0
MrSid Viewer for you to download at
ftp://ftp.okcc.state.ok.us/gis/MrSid/ .  This viewer is free and does
not timeout but it is not as robust as the GeoExpress.  You can export a
selected area to a TIFF at various resolutions, however no jpg
compression option.

 

Mike Sharp

Acting State Geographic Information Coordinator

Office of Geographic Information

and

Director Information Technology

Ass't Director AML Program

Oklahoma Conservation Commission

2800 N. Lincoln Blvd., Suite 160

Oklahoma City, OK 73105

405-521-4813 Office

405-833-0648 Cell

405-521-6686 Fax

Mike.Sharp at conservation.ok.gov

 

________________________________

From: okgis-bounces at gis.gis.ou.edu [mailto:okgis-bounces at gis.gis.ou.edu]
On Behalf Of Brown, Scott
Sent: Wednesday, January 24, 2007 10:26 AM
To: Oklahoma GIS Community
Subject: RE: [OKGIS] Old aerial photos of OKC?

 

If you have access to AutoCAD Map, you can import the freely available
mrsid images straight into your drawing.  Otherwise there is a command
line utility (I've never used) at
http://www.lizardtech.com/download/dl_options.php?page=geo (scroll down
to MrSID Decode) that is supposed to decompress the MrSID files to a
format that AutoCAD can natively read (i.e. TIFF).  Maybe someone else
has experience with this and can comment on whether or not it works as
advertised.

 

Scott Brown

GIS Specialist

The Benham Companies

 

________________________________

From: okgis-bounces at gis.gis.ou.edu on behalf of dw.converse at okc.gov
Sent: Wed 1/24/2007 10:07 AM
To: okgis at gis.gis.ou.edu
Subject: RE: [OKGIS] Old aerial photos of OKC?

Is there a web site that will let me get aerial photo for Oklahoma in a
format to import into Autocad?

	-----Original Message-----
	From: okgis-bounces at gis.gis.ou.edu
[mailto:okgis-bounces at gis.gis.ou.edu] On Behalf Of David W. Wheelock
	Sent: Tuesday, January 23, 2007 2:13 PM
	To: Oklahoma GIS Community
	Subject: [OKGIS] Old aerial photos of OKC?

	This is for one of my users here at ODAFF.  See below...

	 

	
________________________________


	From: Mark Bays 
	Sent: Tuesday, January 23, 2007 1:05 PM
	To: David W. Wheelock
	Subject: Maps

	David,

	 

	Is there someplace where free aerial photos from the 30's and
40's of Oklahoma City might exist?  It would be helpful if they were
digitized.

	 

	Thanks

	Mark

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