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UNLV Libraries -> Architecture Studies Library -> Collections -> Las Vegas Guides and Collections -> Map and Aerial Photo Resources for Las Vegas

Digital Orthophoto Quadrangles

ABOUT DOQs
An aerial photograph and an orthophoto or orthoimage may look alike but there are several important differences that allow an orthophoto to be used like a map. A conventional perspective aerial photograph contains image distortions caused by the tilting of the camera and terrain relief (topography). It does not have a uniform scale. You cannot measure distances on an aerial photograph like you can on a map. An aerial photo is not a map. The effects of tilt and relief are removed from the aerial photograph by a mathematical process called rectification. An orthophoto is a uniform-scale image. Since an orthophoto has a uniform scale, it is possible to measure directly on it like other maps. An orthophoto may serve as a base map onto which other map information may be overlaid. The preceding description is from the USGS DOQ page.

HOW TO ACCESS DOQs ON THE WEB

http://keck.library.unr.edu

Once the site opens click on the link for Digital Orthophoto Quadrangles (DOQs) under the heading Maps and Geo-Images. Then type in either the DOQ name or County you would like to search (Nevada Counties Only) and submit your request. You will then be forwarded to a site that has all of the available DOQs for the county you requested listed alphabetically by USGS quadrangle name. For each USGS Topographic Quadrangle there are four DOQs so be sure to access all four. Under the name, right click and a little gray box will appear and give you the option to save the target as. Selecte where you would like the file to go and then hit enter. It will begin to download the file to the location you selected. Once complete, there are two ways to open up the data.

DATA ON CD
The information is also available on CDs at Lied Library. The CDs may be checked out and then viewed using either GIS or image viewing software.

ARCVIEW GIS (AVAILABLE IN THE SOGG BUILDING CADD LAB)

This software allows you to open up a number of files and will automatically match the different files together. Select the Arcview GIS 3.2 program.

PHOTOSHOP OR OTHER IMAGE VIEWING SOFTWARE

These programs can open up the tiff images but will not automatically line the images up. Once starting the program select file and under the pull down menu select open. A box will appear allowing you to select the destination of the file you wish to open. Locate the file and then click okay. The file will then open.


FREE ARC EXPLORER DOWNLOAD FROM ESRI

ArcExplorer is a lightweight GIS data viewer developed by ESRI. This freely available software offers an easy way to perform basic GIS functions. ArcExplorer is used for a variety of display, query, and data retrieval applications, and supports a wide variety of standard data sources. It can be used on its own with local data sets or as a client to Internet data and map servers. The preceding description is from the ESRI Homepage.
This program is available for download at: http://www.esri.com/software/arcexplorer/


List of DOQs for Las Vegas Valley on the UNR Website

Exact dates are not available at this time. Through visual identification of current landmarks it is estimated that the Las Vegas photos date around 1995.

DOQname

HDR Metadata

Quarter

OhioLocation

OrderSetNo

ItemNo State County
blue diamond blue diamond NWS 36115A41.tif 7 54 NV Clark
blue diamond blue diamond SES 36115A43.tif 7 55 NV Clark
blue diamond blue diamond NES 36115A42.tif 7 53 NV Clark
blue diamond blue diamond SWS 36115A44.tif 7 56 NV Clark
blue diamond ne blue diamond ne SWS 36115B34.tif 7 60 NV Clark
blue diamond ne blue diamond ne NES 36115B32.tif 7 57 NV Clark
blue diamond ne blue diamond ne NWS 36115B31.tif 7 58 NV Clark
blue diamond ne blue diamond ne SES 36115B33.tif 7 59 NV Clark
henderson henderson NWS 36114A81.tif 7 346 NV Clark
henderson henderson SES 36114A83.tif 7 347 NV Clark
henderson henderson SWS 36114A84.tif 7 348 NV Clark
henderson henderson NES 36114A82.tif 7 345 NV Clark
las vegas ne las vegas ne SES 36115B13.tif 7 427 NV Clark
las vegas ne las vegas ne SWS 36115B14.tif 7 428 NV Clark
las vegas ne las vegas ne NWS 36115B11.tif 7 426 NV Clark
las vegas ne las vegas ne NES 36115B12.tif 7 425 NV Clark
las vegas nw las vegas nw NWS 36115B21.tif 7 430 NV Clark
las vegas nw las vegas nw SES 36115B23.tif 7 431 NV Clark
las vegas nw las vegas nw SWS 36115B24.tif 7 432 NV Clark
las vegas nw las vegas nw NES 36115B22.tif 7 429 NV Clark
las vegas se las vegas se NWS 36115A11.tif 7 434 NV Clark
las vegas se las vegas se SES 36115A13.tif 7 435 NV Clark
las vegas se las vegas se NES 36115A12.tif 7 433 NV Clark
las vegas se las vegas se SWS 36115A14.tif 7 436 NV Clark
las vegas sw las vegas sw NES 36115A22.tif 7 437 NV Clark
las vegas sw las vegas sw NWS 36115A21.tif 7 438 NV Clark
las vegas sw las vegas sw SES 36115A23.tif 7 439 NV Clark
las vegas sw las vegas sw SWS 36115A24.tif 7 440 NV Clark



Monday, 17-Dec-2012 10:50:33 PST