For the Indiana Spatial Data Portal, what can I do about 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 ensure 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 (either the single file download page or the ISDP multi-file download tool). 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 the likely problem. Contact your local Internet service provider or network administrator for help with Internet 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 Tuesday and Wednesday 1am-3pm. If you experience problems, try downloading the file again during non-peak hours or on a weekend. Sunday 3am-7am is the least active download period.
  
  
• Consider purchasing the county mosaic on CD or DVD. For more information, see the Purchase imagery section of What is the 2005 IndianaMap Orthophotography Project?

If you have questions, send email to  uitsgis@indiana.edu .

Also see:

• Why do I need a password to download some GIS data from the Indiana Spatial Data Portal?
• How do I install the ISDP Multi-file Download Tool?
• Why do I have trouble accessing files on the Indiana Spatial Data Portal?