Orthoimaging and Photogrammetric Mapping Development
| Agency: | City of Bangor |
|---|---|
| State: | Maine |
| Level of Government: | State & Local |
| Category: |
|
| Opps ID: | NBD11622627681860875 |
| Posted Date: | Dec 21, 2023 |
| Due Date: | Jan 24, 2024 |
| Source: | Members Only |
Orthoimaging and Photogrammetric Mapping Development
The City of Bangor is requesting proposals to provide photogrammetric services to generate orthoimagery, planimetric, and topographic mapping products.
Due by 2:00 PM, Wednesday, January 24, 2024
General Information
Attachment Preview
Request for Proposals
Orthoimaging and Photogrammetric Mapping
Development
Proposal No. P24-26
Purchasing Department
262 Harlow Street
Bangor, ME 04401
207-992-4282
Issue Date: December 20, 2023
I. Introduction
The City of Bangor is requesting proposals to provide photogrammetric services to
generate orthoimagery, planimetric, and topographic mapping products. The specific
services and their delivery shall comply with the specifications contained in this request.
II. General Information
Available on the City’s website at the following web address:
www.bangormaine.gov/proposals. By submitting a response to this solicitation, the
Proposer accepts the responsibility for downloading, reading, and bidding by the terms
and conditions set forth in the City’s “General Information for Vendors”.
In your proposal, please specify whether you currently have or are in the process of
developing a domestic violence policy. If you do not have such a policy, let us know if
you would like to receive a copy of the City of Bangor's policy as a reference.
III. Submission
For consideration, submit the Contact Information, References, and Project Cost and
Timeline forms, in an envelope marked "Proposal No. P24-26: Orthoimaging and
Photogrammetric Mapping Development" by 2:00 P.M. on January 24, 2024.
Submission of documents can be completed by:
A. Emailing to bids@bangormaine.gov ; or
B. Hand Deliver to 262 Harlow Street, Bangor, ME (back entrance of building at City
of Bangor entrance); or
C. US Post Office addressed to 73 Harlow Street, Purchasing Department, Bangor,
ME 04401; or
D. All Other Delivery Services addressed to 262 Harlow Street, City of Bangor,
Bangor, ME 04401.
Proposal No. P24-26
Page 1 of 16 Orthoimaging and Photogrammetric
Mapping Development
All submissions should reference “Proposal No. P24-26: Orthoimaging and
Photogrammetric Mapping Development”. Proposals will be publicly opened at the
time stated above in the temporary Council Chambers, 262 Harlow Street, Bangor,
Maine (see Appendix A - Meeting Location Map).
A tabulation of all received proposals will be posted on the City's website by 4:30 P.M.
on the opening date. Visit www.bangormaine.gov/bidtabs for results.
IV. Questions
Any questions must be directed in writing to bids@bangormaine.gov no later than 4:30
P.M., Friday, January 5, 2024.
The City will provide a response by 4:30 P.M. on Friday, January 12, 2024. This
response will be in the form of an addendum, accessible on the City's website.
Notifications will be sent to the Registered Vendor List when new addenda are released.
To receive these updates, the City strongly encourages all potential bidders to register
as vendors at www.bangormaine.gov/vendorregistration.
V. Late Proposals
It is the responsibility of the Proposer(s) to see that their proposals have sufficient time
to be received by the Purchasing Department before the submittal deadline. Any
proposal, portion of a proposal, or requested proposal revision received at the City
Purchasing Department after the time and date specified, will be returned to the
Proposer unopened.
VI. Withdrawal of Proposals
No Proposer may withdraw their proposal for a period of ninety (90) days from the date
of opening. All proposals shall be subject to acceptance by the City during this period.
To withdraw a proposal prior to the opening, the Proposer shall request the withdrawal
in writing. All costs associated with the withdrawal (i.e. mailing fees) will be borne by
the Proposer.
VII. Rejection
The City reserves the right to reject any proposals, waive any informalities or defects in
proposals, or accept a higher cost proposal if it is deemed to be in the best interest of
the City. The City also reserves the right to clarify with the successful Proposer.
Proposal No. P24-26
Page 2 of 16 Orthoimaging and Photogrammetric
Mapping Development
VIII. Information for Proposers
A. All Federal and State taxes must be excluded from the proposal price. Upon
request, a tax exemption certificate for the City of Bangor shall be furnished to the
successful Proposer.
B. The information requested in Section XIII. Submission Requirements, included
with this request, must be completed and returned for a proposal to be considered.
C. Proposers are required to maintain the following insurance policies throughout the
life of the project and name the City of Bangor as an additional insured where
applicable:
1. Worker’s Compensation Insurance
2. Employer’s Liability Insurance
3. Comprehensive Automobile Liability
4. Commercial & General Liability
5. Professional Liability (Errors &
Omissions)
Statutory
$500,000 each accident
$500,000 disease – policy unit
$500,000 disease – each employee
$1,000,000 combined, single limit per
accident
$2,000,000 combined single limit
$4,000,000 aggregate
$2,000,000 combined single limit
$4,000,000 aggregate
IX. Background
The City of Bangor, Maine, has maintained a robust GIS program for over a decade.
The last city-wide mapping updates were completed in 2019. These improved on
orthoimagery, topographic, and planimetric data developed in 2014 and 2009.
The City currently utilizes 3” resolution (7.5 cm GSD, 15 cm RMSE) full-color
orthoimagery acquired through the State of Maine Orthophotography Program in 2019.
This data was, in turn, used to generate 100-scale planimetric data including features
such as building footprints, impervious surfaces, road centerlines, and recreation trails.
Typical use cases for this and other data include analyzing sites and properties, locating
assets like manholes and streetlights, identifying surface types and conditions, and
evaluating natural habitats.
Upon request, the City will furnish the successful Proposer with additional relevant
information including, for example, existing planimetric, topographic, and orthophoto
data. Any existing data provided will only be used as reference material and all products
will be created new.
Characteristics of the City of Bangor (see Appendix C – City of Bangor Map):
A. Location: Penobscot County, Maine, USA
B. Area: 34.59 square miles
C. Topography: Gently rolling hills and river valleys
Proposal No. P24-26
Page 3 of 16 Orthoimaging and Photogrammetric
Mapping Development
D. Population: ~32,000
E. Land Use: 26% urban, 30% suburban, and 44% rural
X. Scope of Services
A. Overview
The City is requesting proposals from qualified applications to produce new city-wide
orthoimagery, planimetric, and topographic mapping products. These deliverables
will include at minimum:
1. 3” resolution (7.5 cm GSD, 15 cm RMSE) or better full-color orthophotography
captured in Spring 2024.
2. Source data including non-orthorectified, uncompressed imagery and project
files, aero-triangulation data, and stereo pairs.
3. Elevation products including the DTM used during Orthorectification as well as
a derived 2-foot contour polyline layer (optionally; 1-foot contour polylines).
4. Accompanying FGDC-compliant metadata.
B. Technical Specifications
1. General Guidelines
a. Project Management
The successful Proposer shall furnish all necessary materials, labor,
supervision, equipment, and transportation necessary to execute and
complete all work. Work shall be conducted under the direction of City staff
and the GIS Administrator who shall be responsible for the overall direction
of the project, scheduling, quality control, personnel, and inquiries regarding
any other aspect of this project.
b. Quality Control
The successful Proposer shall be responsible for demonstrating that all
technical specifications have been met and that these meet or exceed
accepted professional standards for accuracy and precision. The Proposer
shall implement a QAQC (Quality Assurance and Quality Control) program
that documents these standards, any formal qualifications for employees
and subcontractors, management and oversight processes, and acceptance
procedures. Final deliverables will be accepted according to these
guidelines.
Proposal No. P24-26
Page 4 of 16 Orthoimaging and Photogrammetric
Mapping Development
c. Pilot Project
In order to ensure that deliverables meet the required structure, format,
accuracy, and anticipated timelines, a Pilot Project covering approximately
one (1) square mile will precede the creation of any final deliverables. This
Pilot Project is intended to test production methodologies, delivery
specifications, and to evaluate QAQC procedures. The deliverables
evaluated during the Pilot Project will include Orthoimagery, Topographic
Mapping, and Planimetric Mapping covered in Section XI.B., C. and D.
2. Aerial Imagery
a. Imagery acquisition shall occur during the spring 2024 flying season
(between early April and late May) after water bodies and land surfaces are
free of ice and snow. Final imagery shall be clear and free from artifacts or
imperfections and must minimize the effects of haze, snow, ice, smoke,
dust, seasonal floodwaters, and spring foliage. Additionally, imagery shall
meet the following criteria:
i. Minimum pixel resolution of 3” (7.5 cm) at 15 cm RMSE horizontal
accuracy.
ii. Include four bands – red, green, blue, and near infrared.
iii. Cover the entire City plus a 200-foot buffer.
iv. Compensated for any crab or tilt of the aircraft.
v. Acquired to minimize the effects of shadows and building skew.
b. Imagery acquisition flights shall consist of parallel flight lines and minimize
breaks. Layout should specify a minimum of 60% forward overlap and 30%
side overlap. To minimize building skew and displacement, the overlap ratio
may be increased to 80% in the City’s center.
The Proposer shall be responsible for establishing and surveying both
horizontal and vertical controls required to produce 1:100 scale equivalent
mapping and meet or exceed the following criteria:
i. A primary horizontal control network with an accuracy of 2nd order, class
2.
ii. Horizontal control will be based on the NAD1983 datum, 1996
adjustment.
iii. Horizontal network must be connected to a minimum of three Order-B
NSRS control stations.
iv. Vertical control will be at least 3rd order accuracy and must be based on
the NAVD88 datum.
c. The Proposer will provide the City with recent evidence of a manufacturer
or independent calibration on any cameras or sensor equipment used to
Proposal No. P24-26
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Mapping Development
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