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Upper San Pedro Watershed

Importing San Pedro Data

This information is provided for users unfamiliar with GIS file structures and
GIS applications in general. Experienced GIS users will recognize exceptions to
the information provided below.

The directory structure of this CD is as follows:


The files located in the Coverages and Grids directory on this CD are GIS data
files in ArcInfo format. These data files are commonly referred to as coverages
and grids. When viewed from the command line or Windows Explorer, each coverage
or grid appears as a subdirectory or folder containing numerous files. The data
storage structure of these files is complex and makes use of relational database
principals. Simply copying a coverage or grid from the CD to a users computer
will likely result in a corrupted version on the users machine. This is because
not all of the required files will be transferred and the relational links to
necessary portions of the data will be lost. 

A user may transfer the entire Coverages and or Grids directory to their hard
drive or other suitably large storage devise without corrupting the data files
contained in the directory. The procedure is different if a user only wants to
transfer selected coverages or grids to their computer.

Without GIS software, individual coverages or grids must be copied to the user's
computer using special export files that allow the dataset to be transferred
without corruption. The (zipped) export files for each dataset in the Browser are
provided in the Exports directory, and may be copied from the CD to another storage 
devise using the copy command from the command line or any of the methods available 
in Windows Explorer.  These files can also be downloaded to a location of the user's
choice by clicking on the 'Download' button on each data page in the browser.

Coverages - all coverages are provided as ArcInfo Export (*.e00) files in the Exports 
directory, and have been compressed using ZIP or GZIP.  Once transferred to your
computer, the files need to be uncompressed using Winzip Exit EPA Disclaimer or similar 
product.  A copy of the current version of WinZip is included in the  WinZip directory 
on this CD.  Installation of the WinZip software is accomplished by  double clicking 
the winzip70.exe file from Windows Explorer.


The Import71.exe file located in the ArcExplorer directory will install the software 
necessary to convert the uncompressed export (.e00) files into coverages.  To install, 
double click the import71.exe file in the Windows Explorer.  Once installed, the 
Import71 utility prompts the user for the location of the export file to be imported 
and the location of the directory where the imported coverage should be placed. 
Numerous export files can be imported into the same directory. Once imported, the 
individual coverages should only be modified or relocated using GIS software.

Grids - the creation of Export (.e00) files for grids is less efficient than simply
zipping workspaces containing individual grids.  As a result, the grids on this browser
are provided as compressed *.zip files for transfer/download.  Once unzipped, the grids
are ready for use, and do not need to be imported using the Import71 utility.  Please
do not, however, copy the grids out of the workspace/directory they come in using
anything other than GIS software.  A workspace is the directory containing the 'info'
directory, and the dataset directory.

Shapefiles - a shapefile is actually a group of files with the same name, but different
file types (e.g. *.shp, *.shx, *.dbf, etc.).  For convenience, these files have been 
zipped/compressed into one file for transfer/download that can be found in the 'Exports'
directory.  They may also be copied directly from the 'Shapefiles' directory using 
Windows Explorer, provided that you are careful to copy all of the files with the same 
base name.

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