One-meter MrSid 2005 NAIP photos for Oregon

Here are the 2005 USDA NAIP photos for Oregon. Main data page

Counties:
Baker
Benton
Clackamas
Clatsop
Columbia
Coos
counties.mxd
Crook
Curry
Deschutes
Douglas
Gilliam
Grant
Harney
Hood_River
Jackson
Jefferson
Josephine
Klamath
Lake
Lane
Lincoln
Linn
Malheur
Marion
Morrow
Multnomah
Polk
Sherman
Tillamook
Umatilla
Union
Wallowa
Wasco
Washington
Wheeler
Yamhill
Many of the files are > 2 gigabytes. They are posted in gigabyte pieces that you need to re-assemble.

More on file formats

The MrSID .sid format is lizardtech's proprietary implementation of wavelet compression. The compression ratio is about 15:1in this case, with some loss of information. That's still very big. MrSID files can be read in ArcMap and with Viewers and plugins from LizardTech. The .aux file is an optional auxillary file created by ArcMap. The .sdw file is a "world" file with the values to transform from row/column numbers to northing/easting. Most software does not need this. The .shp file, along with all the other files bearing the same root name, constitute a shapefile. This is an ESRI polygon format, readable by many other software packages. It shows the component quarter quads of the mosaic. Around here, a "quadrangle" is a 7.5-minute by 7.5-minute (~7 by 10 mile) area as seen on a USGS 1:24000-scale topo map. Hence a quarter quad is 3.75 minutes by 3.75 minutes.

MrSID files can be viewed, and subsets can be written to image files with the free TatukGIS Viewer. See an example (with world file).

Large Files

Files larger than 2 gigabytes cannot be downloaded under most systems, so they are broken into gigabyte chunks.

New technique

Download httpcat1.py. Examine it, as it is always wise to examine a program that a stranger asks you to execute on your computer. To download, for example, Clallam County, type httpcat1.py http://rocky2.ess.washington.edu/data/raster/naip2006/Clallam/naip_1-1_1n_s_wa009_2006_1.sid This should download the 3 pieces and append them on the fly. It may fail because the command line cannot find httpcat1.py. Either it should be in your searchpath or its full or relative location should be specified. It mayfail because your version of python does not contain urllib. Update. It may fail because python is not in your searchpath. Either add it to your path or give the path to python, e.g. C:\Python24\python.exe httpcat1.py http://rocky2.ess.washington.edu/data/raster/naip2006/Clallam/naip_1-1_1n_s_wa009_2006_1.sid

Old technique

If you download these pieces you must append them with, e.g.:

where fname is, for example naip_1-1_1n_s_wa001_2006_1

Warning: I tested the DOS copy through a remote mount to my linux web server, and the process beat the server to a pulp. Web requests were failing and packets were dropping right and left. I was convinced I was suffering a hardware failure. No, it was just DOS.

This site is still under construction, but comments are welcome.

Webmaster: Harvey Greenberg