Upper Illinois River Basin NAWQA

U.S. Geological Survey OFR 01-459

CD-ROM Index Data List Report Table of Contents

How to use the files on this CD-ROM

This compact disk-read only memory (CD-ROM) is included with U.S. Geological Survey OFR 01-459. The CD-ROM contains data collected for the Land-Use Gradient (LUG) Special Study of the National Water-Quality Assessment Program, U.S. Geological Survey. See report text for further details about the study and the methods used to collect the data.

The physical, chemical, and biological data collected for the LUG study are presented in tab-delimited American Standard Code for Information Interchange (ASCII) text files on this CD-ROM. The ASCII text files of the data can be imported into a spreadsheet or database for data analysis or, for a quick review of the data, the files can be viewed from an Internet browser. However, the files specifically were created to allow import into a spreadsheet or database of the user's choice. Because of the tab delimiters in the text files, the data does not appear as neat columns of text in the browser window.

In order to take complete advantage of the hypertext markup language (HTML) and data files on the CD-ROM, the system requirements are an Internet browser and a spreadsheet or database application. However, if these system requirements are not met, the ASCII text files of data on the CD-ROM are usable in any application that can open them, such as a word-processing application. The data files are located in the tables directory of the CD-ROM.

To begin navigating through the CD-ROM using an Internet browser, open the index.html file first. The following describes the files contained on the CD-ROM:

README.txt provides an introduction to the contents of the CD-ROM, including files and directories. (This file is README.html)

index.html is the introductory (index) page that is viewable in an Internet browser. It describes the information that is contained on the CD-ROM. This file should be the first one opened in an Internet browser because it contains useful links that organize the data such as links to the report text, data, and data documentation.

datalist.html is a file that is viewable from an Internet browser. Index.html links to it. Datalist.html contains links to data file documentation that is viewable with an Internet browser, and tab-delimited ASCII summary and raw data files that can be imported into a spreadsheet application.

uirb.css is the cascading style sheet used to set the colors for the HTML pages contained on this CD-ROM. It is used by the HTML files and Internet browser, and need not be opened by the user.

documentation is a directory containing data-file documentation. The documentation for each data file is available as HTML files that are viewable with an Internet browser and also as ASCII text files. The HTML files are linked from the datalist.html page.

images is a directory containing the images used by the HTML files on this CD-ROM.

tables is a directory containing all the files of raw and summary data collected during the land-use-gradient study. This directory is divided into subdirectories by data type, which loosely corresponds to the datalist.html categories. Data files are named such that they correspond to the type of data collected. The data files are accessible from datalist.html.