Section 1

Introduction


 

 

 

1-01†††† SCOPE AND APPLICATION

Photogrammetry consists of the accurate measurement of man-made and natural land features through the production and use of aerial photographs and can be supplemented by field-edited surveys which compensate for information not otherwise revealed by the photographs.

Once the photographs and related information become available, original map manuscripts can be compiled and final-drafted as maps, plans, related specialized drawings or other graphic representations of land features at the intended scales and contour intervals.

1-02†††† PROJECT AREA

Each project area shall be delineated on a United States Geologic Survey (USGS, also known as Quad Map ) sheet; or comparable keymap to include the breadth and length of the project and its relationship to the surrounding terrain.

A twenty - five millimeters (25 MM) wide band at the final map scale encompassing the project area shall also be compiled to insure complete coverage of the area.

1-03†††† FLYING PERIOD

Aerial photography shall be undertaken only when well-defined images can be obtained.† Photography shall not be attempted when the ground is obscured by haze, snow, foliage, flooding conditions or when clouds or cloud shadows would appear on more than five (5) percent of the area of any one photograph.† At the time of year during which aerial photographs must be taken, shadows caused by topographic relief and low sun angle shall be avoided whenever possible.† Aerial photography shall not be undertaken when the angle is less than thirty (30) degrees above the horizon.

1-04†††† NEGATIVES AND PHOTOGRAPHS

All photographic negatives shall become the property of the State of New Jersey, Department of Transportation (NJDOT).† All photographs shall be clear, sharp, free of blemishes and of good quality in all respects.† The scale, date, and project identification shall be evident thereon, and identifying numbers in sequence shall be indicated on all photographs.

The Contractor shall furnish two (2) sets of photographic contact prints on resin-coated paper showing sufficient overlap for stereoscopic study of the project area.

The Contractor shall likewise furnish any additional photographic reproductions so designated by the NJDOT upon examination of the contact prints.

The Contractor shall furnish two (2) copies of a photographic index map of each project area, printed on resin-coated paper, to permit selections of prints on any part of the project in question.

1-05†††† RESPONSIBILITY FOR CONTROL SURVEYS

The Contractor shall provide all materials, supplies, equipment and qualified personnel required for the satisfactory completion of all control surveys to the accuracy and precision stipulated by the NJDOT.† Unless stated otherwise, all field and office work shall be done by the Contractor, and only Professional Land Surveyors licensed by the State of New Jersey, Department of Law and Public Safety, Division of Consumer Affairs, Board of Professional Engineers and Land Surveyors, shall be authorized to perform and supervise complete control surveys.

Each survey tape, leveling rod and precision instrument, i.e. theodolite, level, electronic distance measuring device, global positioning system instrument, etc., shall have been calibrated within the past year.† Calibration tests and results shall be submitted to the NJDOT upon request.

1-06†††† BASIC DRAFTING REQUIREMENTS

All maps and plan sheets shall be produced on tracing sheets made of dimensionally stable polyester-type plastic transparent film having a minimum thickness of one tenth of a millimeter (0.10 MM).† Every feature and detail plotted thereon shall be sufficiently clear and accurate so that all subsequent reproductions will show clearly legible nomenclature and symbol definition at the prescribed scale.

The Contractor shall compile all planimetry and topography stipulated by the NJDOT onto map manuscripts by stereophotogrammetric methods at the direct scale and contour interval prescribed by the NJDOT.† The symbols used to represent planimetric and topographic features shall be in accordance with Figures 1-1A, 1-1B, 1-1C, and 1-2.

The map manuscripts shall be available for inspection by the NJDOT at all times, and they shall be delivered to the NJDOT for field-editing and the incorporation of any additional planimetric detail.

The Contractor shall obtain and neatly render on the maps the current names and political subdivision or corporate lines of any adjoining states and all concerned counties and municipalities.† Also required are the current designations of all Federal, State and County roadways and the names of prominent bodies of water such as rivers and lakes.† In addition to being legible and clear in meaning, all names and numbers so rendered shall not interfere with map features.

On projects with flights east and west, map sheets and plan sheets shall commence from the west and progress eastward.† On projects with flights north and south, map sheets and plan sheets shall commence from the south end and progress northward.

1-07†††† PLAN INDEX

The Contractor shall prepare an index of maps or plan sheets on tracing sheets made of plastic film as prescribed in Section 3-02.1.† The index shall show the positions and relationships of all maps or plan sheets superimposed over a drawing or composite photograph of the entire project.† Sufficient data shall be indicated on the index to permit selection of individual sheets.

1-08†††† METHOD OF TESTING AND INSPECTION

The Contractor shall submit two complete sets of computations and adjustments of all ground control data to the NJDOT for review by the NJDOT before the analytical solution for stereo compilation is begun.† Submissions shall be in both hard and computer floppy diskette or compact disk formats.† Computer diskettes or compact disks (CDís) must be 100% NJDOT compatible.† The NJDOT shall advise the Contractor of approval or rejection within the thirty (30) calendar days after receipt of the computations by the NJDOT.

The Contractor shall submit three (3) black-line or blue-line white check prints of each completed final map tracing sheet for review.† The NJDOT will direct, at its discretion, either in-house personnel or the outside Consultant contracted by NJDOT to prepare the formal plans, specifications and estimates, if other than the Contractor, to:† (1) field-inspect and test the submitted check prints for completeness of planimetry or topography, and (2) ensure general conformance with Section 5 and specific conformance with Section 7 at the applicable scales.† Contour accuracy will be tested by taking elevations of points crossed by a field traverse.† In all cases, the NJDOT reserves the right to select the areas to be tested.† The required field inspections and conformance checks shall have priority to be accomplished as promptly as possible.

When a tracing sheet or check print is rejected based upon its percent of error being greater than the allowable value as stipulated by these Specifications, the Contractor shall review and revise the sheet as required to bring it within the permitted tolerance.

For either the initial or subsequent submissions, the NJDOT shall be allowed sixty (60) calendar days for each sheet after the receipt of the check prints for review.† The Contractor shall be notified of approval or rejection with this period.† If any sheet is rejected, the Contractor shall upgrade it to an acceptable level of accuracy and shall submit three (3) additional prints as before, at his own expense, within thirty (30) calendar days after notification or rejection.† After the initial review and rejection, all additional field inspections, tests or other checks made by the NJDOT will be at the Contractor's expense at the rate of four hundred dollars ($400) per sheet for each additional rejection and subsequent check.† All required corrections and resubmitted check prints shall be at the Contractor's expense.

The Contractor shall deliver tracing sheets by items or sub-items when notified of final approval of all tracing sheets by the NJDOT except that, upon special NJDOT requests, the Contractor shall deliver a particular tracing sheet of an approved map or plan sheet.

1-09†††† COMPLETION TIME AND PRIORITIES

Contact photographs and indexes shall be delivered to the NJDOT within ten (10) calendar days after the flying period shown on the Proposal form and Contract, given permissible flying conditions.† Failure to complete flying of all items and sub-items within the flying period, without advance written authorization, shall be cause for annulment of the Contract.

Unless stipulated otherwise by the NJDOT, the Contractor shall produce and submit check prints of the first six (6) final map tracing sheets in sequence to the NJDOT within seventy-five (75) calendar days of the last day of the flying period.† Additional check prints must be submitted at the rate of ten (10) sheets over forty-five (45) calendar days thereafter.† Where two or more items are combined in one contract, time allowed will be figured either consecutively or by priority unless specified otherwise by the NJDOT.

If the flight of any item is subjected to an authorized delay beyond the flight period for any reason, the last day of the flying period shall, nevertheless, be considered the final date for determining photograph and map delivery dates.

All remaining negatives shall be delivered to the NJDOT within thirty (30) calendar days after complete acceptance of all maps covered by the Contract.

1-10†††† METHOD OF PAYMENT

Payment shall consist of full compensation for all work completed and accepted by the NJDOT, for defrayal of all fees and other costs, for performance of extra work and alterations ordered by the NJDOT, and for submission and delivery to the NJDOT according to the Proposal form, the Contract, and any subsequent Addenda and Change Orders.† The Contract-specified unit price times the actual quantity of each pay item accepted by the NJDOT, or the lump sum of each pay item accepted by the NJDOT, or the force account basis when applicable and authorized by the NJDOT, shall constitute the basis for payment.

The Contractor may request partial payments for work performed on items with lump sum prices.† These requests may be submitted monthly and shall be made on voucher forms supplied by the NJDOT.† Upon approval, payment shall then be meted out by the NJDOT on the following basis:

FIGURE 1-1A:††††††††††† NJDOT STANDARD LEGEND

FIGURE 1-1B:††††††††††† NJDOT STANDARD LEGEND (CONT.)

FIGURE 1-1C:††††††††††† NJDOT STANDARD LEGEND (CONT.)

FIGURE 1-2:††††††††††† SUPPLEMENTAL SYMBOL LEGEND