Common use of DIGITIZING Clause in Contracts

DIGITIZING. 2.3.1 A digitized graphic data model called ‘Mapping’ of the topographic mapping for this project shall be in a V8 3-D ".DGN" format for Bentley Systems software, furnished on a recordable compact disc. The version of Microsoft Windows must be NT or higher. Compact Discs will be furnished with the check prints. 2.3.2 A Break-line/Spot elevation model called ‘DTM’ which contains all pertinent planimetric and topographic features necessary to create an accurate digital terrain model (DTM) of the aerial mapping area, also in the same Bentley V8 3D.DGN file format shall be provided. The breaklines are not to cross but are to fall just short of the breakline of intersection within a tolerance prohibiting the triangulation through the breakline. The breakline should be constructed in such a manner that prohibits the triangulation through it. Also a breakline should not ‘loop’ back upon itself or have ‘tails’ at the ends of the breakline. These breaklines shall be tested by the consultant to assure that no breakline crosses or touches another breakline. A series of line segments which delineate and define the discontinuities of the terrain (model) surface (Improved and/or unimproved). Examples of breaklines are edges of roadways (paved or unpaved), crown of street, or manmade flowlines, drains, changes in slope gradient, edges of graded pads, tops and toes of slopes, tops and bases of retaining walls, steep cliff faces, retaining structures - such as bridge abutments, etc. Generally, breaklines can be loosely defined as the intersection of two planes and are any linear terrain feature that delineates the ground surface (improved and/or unimproved), and therefore have a controlling effect on the definition and accuracy of the digital terrain model. These breaklines serve as a wall through which terrain triangles cannot pass. Additionally, for further definition and accuracy of the DTM, spot or "regular" surface points should be added to the DTM (surface model) to further define and "fill-in" the surface. The more severe the discontinuities in the surface, the greater the need for increased density in point collection. The spots, used to define the gradient change, needs to be dense enough to prevent unwanted flattening in the surface according to the contour interval. As a general rule of thumb, these points should be collected at a density of ½" at the plotted scale. The use of a good engineering font, capital x or +, with a center/center justification shall be used for point symbology. A raised or depressed point defining a surface where a break line could not define that surface. Examples are tops of mounds, mountains, hills, raises, peaks, and raised cones or bottom of depressions, ditches, craters, holes and depressed cones. The contours shown in 3.a above shall be generated solely from this DTM data. 2.3.2.1 The appropriate City of San Diego cell library (V8 City Existing.cel), font resource file (V8 City Font.rsc), color table (V8 City color.tbl), line style (V8 City Line Style.rsc), level scheme, and seed file parameters are to be used for placement of all elements in the design files, with strict adherence to "Working Units" and seed file "Global Origin". Base map level schemes are attached. A diskette containing the most current version of the above seed files, cell libraries and font resource files will be provided to the aerial contractor, if needed, upon request. 2.3.2.2 All graphic elements within the Project Design File shall adhere to appropriate MicroStation element definitions to allow for error free translation of design files from 3d to 2d. If the Design file is observed to have incorrect element definitions which produce errors related to either the above 3d to 2d file translations, or produce errors when used with other Bentley Applications software, the aerial contractor shall be responsible for the correction of any errors or deficiencies in the design file related to incorrect graphic element definitions, etc. 2.3.2.3 Intergraph Design file working units shall be the Survey Foot: I.E., Feet, 10th's of a foot, and 1000th's of a foot. Use a (sf) symbol for foot annotations, and (su) for tenths annotations in working units tutorial. 1200/3937 sf = 1.0 m and 1200/393700 se = 1.0 cm. (Note: Above parameters are provided in V8 nad83 3d.dgn).

DIGITIZING. 2.3.1 A digitized graphic data model called ‘Mapping’ ‘Mapping’ of the topographic mapping for this project shall be in a V8 3-D ".DGN" format for Bentley Systems software, furnished on a recordable compact disc. The version of Microsoft Windows must be NT or higher. Compact Discs will be furnished with the check prints. 2.3.2 A Break-line/Spot elevation model called ‘DTM’ ‘DTM’ which contains all pertinent planimetric and topographic features necessary to create an accurate digital terrain model (DTM) of the aerial mapping area, also in the same Bentley V8 3D.DGN file 3D.DGNfile format shall be provided. The breaklines are not to cross but are to fall just short of the breakline of intersection within a tolerance prohibiting the triangulation through the breakline. The breakline should be constructed in such a manner that prohibits the triangulation through it. Also a breakline should not ‘loop’ back upon itself or have ‘tails’ at the ends of the breakline. These breaklines shall be tested by the consultant to assure that no breakline crosses or touches another breakline. A series of line segments which delineate and define the discontinuities of the terrain (model) surface (Improved and/or unimproved). Examples of breaklines are edges of roadways (paved or unpaved), crown of street, or manmade flowlines, drains, changes in slope gradient, edges of graded pads, tops and toes of slopes, tops and bases of retaining walls, steep cliff faces, retaining structures - such as bridge abutments, etc. Generally, breaklines can be loosely defined as the intersection of two planes and are any linear terrain feature that delineates the ground surface (improved and/or unimproved), and therefore have a controlling effect on the definition and accuracy of the digital terrain model. These breaklines serve as a wall through which terrain triangles cannot pass. Additionally, for further definition and accuracy of the DTM, spot or "regular" surface points should be added to the DTM (surface model) to further define and "fill-in" the surface. The more severe the discontinuities in the surface, the greater the need for increased density in point collection. The spots, used to define the gradient change, needs to be dense enough to prevent unwanted flattening in the surface according to the contour interval. As a general rule of thumb, these points should be collected at a density of ½" at the plotted scale. The use of a good engineering font, capital x or +, with a center/center justification shall be used for point symbology. A raised or depressed point defining a surface where a break line could not define that surface. Examples are tops of mounds, mountains, hills, raises, peaks, and raised cones or bottom of depressions, ditches, craters, holes and depressed cones. The contours shown in 3.a above shall be generated solely from this DTM data. The contours produced from the DTM data shall meet or exceed ASPRS 90 standards where 68% (1Φ) of the contours tested fall within 1/3 contour interval. Any point tested that is more than 3Φ out shall be regarded as blunderous. These standards closely parallel the familiar National Map Accuracy Standards. 2.3.2.1 The appropriate City of San Diego cell library (V8 City Existing.cel), font resource file (V8 City Font.rsc), color table (V8 City color.tbl), line style (V8 City Line Style.rsc), level scheme, and seed file parameters are to be used for placement of all elements in the design files, with strict adherence to "Working Units" and seed file "Global Origin". Base map level schemes are attached. A diskette containing the most current version of the above seed files, cell libraries and font resource files will be provided to the aerial contractor, if needed, upon request. 2.3.2.2 All graphic elements within the Project Design File shall adhere to appropriate MicroStation element definitions to allow for error free translation of design files from 3d to 2d. If the Design file is observed to have incorrect element definitions which produce errors related to either the above 3d to 2d file translations, or produce errors when used with other Bentley Applications software, the aerial contractor shall be responsible for the correction of any errors or deficiencies in the design file related to incorrect graphic element definitions, etc. 2.3.2.3 Intergraph Design file working units shall be the Survey Foot: I.E., Feet, 10th's of a foot, and 1000th's of a foot. Use a (sf) symbol for foot annotations, and (su) for tenths annotations in working units tutorial. 1200/3937 sf = 1.0 m and 1200/393700 se = 1.0 cm. (Note: Above parameters are provided in V8 nad83 3d.dgn).