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Page 3 of 7 Pacific International Engineering Maple River- Phase I Proposal July 18, 2003 It is understood that you will contract with Houston Engineering Inc, of Fargo, ND for the ground survey component of this project. It is understood that Houston will furnish all targeted ground control necessary for controlling the topographic mapping. Enclosed is a diagram showing the location of the eight (8) new points and the repanel of five (5) existing ground control points required for this project. Each point will require a panel measuring 18" x 8' for each of four legs in a cross formation. Airborne GPS will be the primary control utilized on this project. Airborne GPS photo control greatly reduces the amount of ground control required as each photo center provides a control location. Enclosed is a copy of the Airborne GPS ground survey requirements. This document outlines the services that we require in support of our Airborne GPS operations. NOTE: The surveyor responsible for the ground control survey shall verify which horizontal coordinate system and vertical datum will be required by the client for any control survey work performed in conjunction with this project. When using control information provided by our clients, an additional charge of $75.00 per hour will be made for excess office time, if any, to resolve problems created by the receipt of erroneous control. The horizontal ground control survey closure shall be at least NGS Second Order Class II and vertical closure shall be at least _+0.1 times the targeted contour interval. Horizontal Datum Vertical Datum Coordinate System Mapping Units Project Coordinate Specifications INAD 83 NAVD 88 ND State Plane South Zone feet Survey Report Ground survey data will be supplied in final project coordinates. In addition, Airborne GPS projects require latitude, longitude and ellipsoid values for each control location. Horizons requires a Registered Land Surveyor to verify ground control survey projects. Survey data for all points will be provided in a final survey report signed by a Registered Land Surveyor and also as a digital file in standard ASCII X,Y,Z format. - Aerotriangulation - The aerial photography and ground control will be used in conjunction with aerotriangulation techniques to establish a consistent horizontal and vertical datum for the area being mapped. From basic traverses to establish secondary control, aerotriangulation will be used to supplement the targeted photo control to produce fully controlled stereomodels. - LiDAR Processing - LiDAR elevation data will form the foundation of the Digital Terrain Model on this project. LiDAR data will be processed through three stages in Phase I of this project: (1) Pre-processing, (2) Post-processing, and (3) Manual Feature Classification. (The fourth and final phase of operations, 3D Edit, will be processed during Phase II operations under a separate contract).