Hello all,
I've recently found some high-res color satellite imagery available for download on my county's GIS website. It consists of tiles in MrSID format (with a .sdw file for geolocation), of ~ 3 MB each. I'm wanting to use this imagery as a more detailed replacement for some of the BirdsEye imagery I downloaded through Garmin for my Oregon 450.
The imagery for the whole county is about 15 GB of MrSID files. What I'd like to do is to take the tiles, combine them into large raster maps like I have with the BirdsEye stuff and get as good of coverage of my home county as I can (downsampling where appropriate), given the limits of the Oregon and my memory card (I have a 16 GB MicroSD card in it). I know there's a 4 GB file size limit due to the FAT filesystem, and also limits on the size and number of map tiles available on the Oregon.
I've tried using G-Raster, but it can't geolocate the MrSID files, even with the .sdw information.
Has anyone done anything like this and could tell me what tools I could use to create the raster maps for my Oregon? I've tried using a number of tools to create a small map to test the quality and file size, but I can't even manage to do that.
Is this possible, or am I totally crazy? Can anyone help point me in the right direction for making large raster maps for the Oregon from MrSID data?
Thanks,
Jason