A Portal to High-Resolution Topography Data and Tools
OpenTopography provides an end-to-end system for the distribution and processing (DEM generation) of LiDAR topography data.
KMZ files for LiDAR-derived images
The MapWarehouse allows you to purchase and download GIS data instantly using a simple Google Maps interface.
Purchase orthophoto, parcel, base maps and DEM
Whitebox GAT is an open-source and transparent GIS and remote sensing package that is flexible and powerful. This is the replacement for the much-used Terrain Analysis System (TAS).