Global Mapper has advanced capabilities,like image rectification, contour generation from surface data, is it true?

Global Mapper has advanced capabilities like image rectification, contour generation from surface data, view shed analysis (including Fresnel) from surface data, terrain layer comparison (including differencing), and triangulation and gridding of 3D point data. Repetitive tasks can be accomplished using the built in scripting language or comprehensive batch conversion functionality.

Global Mapper is more than just a utility; it has built in functionality for distance and area calculations, raster blending, feathering, spectral analysis and contrast adjustment, elevation querying, line of sight calculations, cut-and-fill volume calculations.

Global Mapper also includes the ability to directly access multiple online sources of imagery, topographic maps, and gridded terrain data. This includes access to worldwide high resolution color imagery from DigitalGlobe (watermarked access for free), detailed street maps from OpenStreetMap.org, and access to the entire TerraServer-USA database of USGS satellite imagery and topographic maps free-of-charge. Global Mapper also has the ability to easily access WMS data sources, including built-in access to elevation data and color imagery for the entire world, and to view elevation data in true 3D with any loaded raster imagery and vector data draped on top of it!

Global Mapper supports viewing of dozens of the most common data formats:

GeoPDF DLG (DLG-O & SDTS) DRG DOQ DEM DGN DTED DWG DXF GPX SDTS DEM ECW MrSID (Imagery & Lidar) ESRI Shapefiles E00 Vertical Mapper GRD JPEG2000 CADRG/CIB GeoTIFF KML/KMZ Lidar LAS Arc Grid Tiger/Line SEGP1/UKOOA P-190