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SO <br />(AB) Surveying & Mapping Services <br />City of Santa Ana <br />• Line smoothing programs are used where appropriate to enhance aesthetic quality of the <br />contour strings. Every index contour will be labeled. <br />Digital Planimetric Mapping <br />This task involves extraction and processing of planimetric features from the aerial photography <br />using interactive photogrammetric techniques. Data fi•om field edits will be integrated at this stage as <br />well. <br />• The photogrammetric technicians will digitize all of the planimetric features desired by <br />the City into a MicroStation design (.DON) file using digital mapping software. Common <br />features are grouped together and placed on predetermined levels in accordance with the <br />City's CADD specification, and assigned their distinguishing Iineweights, linestyles and <br />colors. <br />• The planimetric files will be divided into sheets as desired by the City, and carefully <br />reviewed by the QC Technicians for correctness, completeness, and aesthetic quality. The <br />files will also be checked for full compliance with the City's CADD specification. QC <br />checks will be performed with digital imagery in the background, and the planimetric <br />data superimposed, making any missing or incorrectly digitized features readily apparent. <br />Checkplots will be produced as a final step in the QC process. <br />• The preliminary file sets will be written to CD-ROM disks for delivery to the City, <br />together with a set of checkplots. <br />• Upon receiving approval from the City, field crews will be mobilized to perform field <br />edits, cross -sections, supplemental DTM data collection, and any other survey tasks <br />desired by the City. Total station instrumentation and data collectors will be used for this <br />task. <br />• Upon completion of the field surveys, the data collectors will be downloaded, the data <br />processed, and integrated into the MicroStation files with the photogrammetrically <br />captured information. Following final QC checks, the completed MicroStation files will <br />be written to CD-ROM disks for delivery to the City, together with a set of hardcopy <br />plots. <br />5150 E. Hunter Ave. 17 Anaheim, CA 92807 <br />(714) 777-8877 alanirank@Johnson-irank.com FAX: (714) 777-1641 <br />