tif images are currupt

We are sorry to hear you are not happy with your results. I was able to download and view the GeoTiff file. The file is 4.4 GB so you will need to use special viewers to work with it. We use QGIS but other GIS software that is optimized for viewing such large files will work too. This file is 76749 x 58472. Lots of softwares out there will top out at 16k x 16k... You also need enough RAM to be able to hold all of that in memory. Dealing with super big files like this is not easy which is why we offer the tiled web maps.