For the Indiana Spatial Data Portal, what can I do if I have problems downloading files?
When you download a spatial data or metadata file from the Indiana Spatial Data Portal (ISDP) using either the Single File Download or the Multi-file Download Tool, you may experience any of the following problems:
- Your downloaded file may be corrupt or invalid.
- The zipped archive may be empty.
- Your browser may time out, resulting in no file being downloaded.
Cause
An interrupted network connection can result in a partially downloaded file. Indiana University's I-Light fiber-optic network ensures high-speed connectivity between Indiana's major universities. However, if you attempt to download a county mosaic or other large file (400MB or more) from the ISDP outside of the I-Light network, a DSL or cable broadband connection does not necessarily ensure that you will have a successful or complete download. The bandwidth, speed, and reliability of your network are crucial for the successful download of large files.
Suggestions
- When your download appears complete, verify that the size of your
downloaded file matches the file size listed on the download page.
UITS recommends using a command prompt to list the size of
the file; this will display the actual file size listed on a
Unix system (e.g., the Massive Data Storage
Service), while the size reported in Windows Explorer
will be slightly different. If the file size on your computer is
smaller, an interrupted Internet connection is likely the
problem. Contact your local Internet service provider or network
administrator for help with network interruptions. You may also want
to check your system's firewall and Internet settings to see if they
are limiting your download capacity.
- The greatest demand for files occurs on Tuesdays and Wednesdays
between 1am and 3pm. If you experience problems, try downloading the
file again during non-peak hours or on a weekend. The least active
download period is between 3am and 7am on Sundays.
- Most network interruptions are only temporary, lasting a few
seconds to a few minutes. If you receive an error message,
retry the file download in 10 minutes. If the problem persists,
note the error message and email the UITS GIS
Specialists.
- Consider purchasing the county mosaic on CD or DVD; see the "Purchase imagery" section of What is the 2005 IndianaMap Orthophotography Project?
If you have questions, email a GIS Support Specialist.
Last modified on September 25, 2009.
