Land Surveying Software is a staple of contemporary land surveying. A land surveying professional is called a land surveyor. In order to apply Western surveying methods, American surveyors were hired. Total stations are the primary survey instrument used in mining surveying. The Icelandic Coast Guard is responsible for hydrographic surveying and nautical charting. LiDAR are also in use in hydrographic surveying. Substantial advancements were made in the fields of cartography and surveying. Geometry was essential to surveying and cartography. SketchUp is owned by Trimble Inc., a mapping surveying and navigation equipment company. The DEM could be acquired through techniques such as photogrammetry, lidar, IfSAR, land surveying, etc. SG-1's duties include first contact, reconnaissance and combat, diplomacy, initial archaeological surveying, and technological assessment. There are also categories for professional services firms (e.g., engineering, architecture, surveying, project management). He also spent time studying the skills of drawing, surveying, and architecture. The Romans recognized land surveying as a profession. Rangefinders are used for surveying in forestry.