What should I do if the Interactive Map will not load?If you receive an error message when trying to view the Interactive Online Map or it will not load properly, this may be the result of one of two problems: either pop-up blocker software is enabled on your computer or a security setting associated with your web browser is preventing this page from being viewed Please verify that all pop-up blockers associated with the web browser and any additional blockers associated with toolbars such as Yahoo or Google are disabled. From Internet Explorer, use the Tools > Internet Options menu to open the Internet Options window. From the Internet Options window, select the Security tab and then click the Custom Level button to open the Security Settings window. From the Security Settings window scroll down to the Scripting area and make sure “Active scripting” and “Scripting of Java applets” are enabled. Also if you are using pop-up blocker software, such as Ad -Watch, be sure to Accept any block notices pertaining to the Interactive Viewer. Why does it take so long for file transfer to begin?All files in the ISDP are archived on a robotic tape system called the Indiana University Massive Data Storage System ( MDSS ). When a file download is initiated, the robotic arm retrieves the necessary tape and loads it into a tape reader. The requested file is then read from tape and transferred to a computer hard drive before the file transfer actually begins. This whole process takes anywhere from 1-5 minutes depending on the size of the file requested and the amount of traffic on the system (larger files take longer to access, and the system is usually busiest in the afternoon). Once the download begins, file transfer rates will depend on how fast your network link is. For wide area connections at 100Mbits/s or better, rates should range from 1-7MB/s. In ArcGIS, why does my DRG show up in all black?Building pyramids on a DRG may corrupt the color ramp associated with the TIFF and cause the image to be displayed without color. If this occurs, simply delete the pyramid file (extension .rrd) to view the image with an appropriate color ramp. If ArcGIS asks, select the No option to build pyramids. In ArcGIS, why does my DEM show up in all black?If a DEM has very little change in elevation, you may see the image displayed without color. This is due to the way ArcGIS is displaying the DEM values, showing a narrow area instead of the entire value set. If this occurs, right click on the layer and select properties. Select the Symbology tab and choose the Stretched statistics. Under stretch type, it may be set to None. Change the stretch type to Standard Deviations of 2 and click apply. What are compressed or archived files?Compressed or archived files (*.tar, *.zip, *.tgz) may contain many separate files in one large archive. Before all the separate files and programs can be read or run, an archiving program must be used to extract the files from the archive. More from IU Knowledge Base File archive methods : The IN DOQQs are stored as "*.tar" archive files. Each archive is comprised of several files which are combined with the GNU "tar" command. In Windows, how do I extract a ".tar" or ".tgz" file?You will need to get file extraction software such as 7-zip . 7-Zip is open source software. You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip.
How do I use DOS commands to extract *.tgz files?You will need to add the pathway of the gzip.exe and tar.exe executables to the PATH environment variable. At DOS prompt, to uncompress tar archive type: This creates a file called testta~1 which is a tar file. -rw-r--r-- 3453/4111 5535092 Dec 18 09:42 2000 ./o41087a7.tif This unpacks the tar archive. How do I use UNIX commands to extract *.tgz files?Rename the *.tgz files to *.tar.gz |
