R99-071 09-27-99 RESOLUTION NO. R99-71
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF
PEARLAND, TEXAS, AUTHORIZING THE CITY MANAGER OR HIS
DESIGNEE TO ENTER INTO AN AGREEMENT WITH WILLIAMS-
STACKHOUSE, INC. FOR PROFESSIONAL MAPPING SERVICES
TO INCLUDE BOTH THE CITY LIMITS AND ITS EXTRA-
TERRITORIAL JURISDICTION.
BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF PEARLAND, TEXAS:
Section 1. That certain agreement by and between the City of Pearland and
Williams-Stackhouse, Inc., a copy of which is attached hereto as Exhibit "A" and made
a part hereof for all purposes, is hereby authorized and approved.
Section 2. That the City Manager or his designee is hereby authorized to
execute and the City Secretary to attest the original of the attached agreement for and
on behalf of the City of Pearland, for professional mapping services to include both the
City limits and its extraterritorial jurisdiction.
PASSED, APPROVED and ADOPTED this the day of
~)~{Y~.~ , A.D., 1999.
ATTEST:
APPROVED AS TO FORM:
CITY ATTORNEY
TOM REID
MAYOR
CONTRACT FOR PROFESSIONAL MAPPING SERVICES
This contract is made and entered into this 27th day of Septernh~gi~999 by and
between the City of Pearland, TexasJ hereinafter called the City, and Williams-
Stackhouse Incorporated, hereinafter called WSI.
I. Scope of Work
WSI shall furnish, in a professional and workmanlike manner, aerial photography,
control surveys and monumentation, analytical aerotriangulation, digital topographic
mapping (updated and new), and digital orthophotography of an 83 square mile
project area as defined by the attachedproject maps.
A. Aerial Photography
To produce the desired map data and photo products, WSI shall obtain new
black-and-white aerial photography at three scales: 1 "=3000' (18,000' above
mean terrain), 1 "=800' (4800' above mean terrain), and 1 "=1300' (7800' above
mean terrain). Each scale shall cover the entire 83 square mile. project area.
The 1 "=3000' photography shall consist of three east-west flight lines and
approximately 30 individual exposures taken with a 60 percent forward overlap
and a 30 percent sidelap. This shall result in full stereoscopic coverage and shall
be suitable for attaining 1 "=500' map accuracy standards and for preparing a
digital orthophoto mosaic (5' pixel resolution) of the entire area.
The 1 "=800' photography shall consist of nine east-west flight lines and
approximately 230 individual exposures taken with a 60 percent forward overlap
The 1 "=1300, photography shall consist of six east-west flight lines and
approximately 66 individual exposures. These exposures shall be precisely
centered over two 1 "=200' map facets and shall be used for preparing digital
orthophotos with a 1' pixel resolution.
WSI shall take the. photography with Kodak Double-X 2405 Aerographic Film or
equivalent using a Wild/Leica RC-30 precision aerial mapping camera. This
camera shall be equipped with a gyro-stabilized mount, forward motion
compensation (FMC), eight fiducial marks, and a standard six inch focal length.
The camera shall meet or exceed USGS.speficications and shall have a USGS
calibration report nor more than three years old.
This phase of the project shall be accomplished during the winter season when
foliage cover is reduced and during the high-sun angle period of the day
(approximately 10:00 a.m. to 2:00p.m,). Thephotography shall also be taken
with calm, clear atmospheric conditions when the ground is not obscured by
clouds, cloud shadows, haze~ fog~ or snow.
After it is taken and developed, WSI shall carefully examine the photography with
respect to scale, overlap/sidelap, crabj tip/tiltj and image quality. Exposures that
do not meet standard specifications, or are in some other way deemed
unacceptable, shall be reflown by WSI as soon as conditions permit. All
acceptable photography shall be labeled with date, scale, city name, flight line
number, and exposure number.
After the photography is checked for quality and labeled, WSI shall prepare two
sets of 9" x 9" contact prints. These shall be printed on Agfa P2-2photographic
paper or equivalent with an EPC UC-2 contact printer. One set of prints shall be
delivered to the City and the other set shall be used for the control survey and
analytical aerotriangulation operations.
WSI shall. also .prepare film diapositives from the aerial photography. These shall
be used for analytical aerotriangulation, digital image scanning, and compilation
of digital topographic mapping. They shall be printed .on Agfa P3p material or
equivalent using an EPC UC-2 contact printer.
B. Control Surveys and Monumentation
To perform accurate photogrammetric measurement, horizontal and vertical
survey data shall be required at numerous locations in and around the project
area. These control points shall be identifiable on the aerial photography and
shall be in strategic locations with respect to the flight lines and stereo-models.
To accomplish this WSI shall utilize as many as possible of the 80 control points
established in 1995. It is anticipated that most that most of these are still in place
and shall be located and targeted prior to obtaining the aerial photography.
WSI shall acquire approximately 15 to 20 additional control points for areas in
which the City has expanded and/or where existing monuments may have been
destroyed. These too shall be targeted and shall be surveyed using GPS
procedures as were used in 1995.
This shall include the placement of three pair of intervisible concrete monuments
with aluminum caps. For each of these monuments WSI shall furnish a report
with description sheets, azimuth references, elevations, coordinates, etc. similar
2
to what was delivered in 1995.
The horizontal control shall be established to at least second order standards
and referenced to the Texas State Plane Coordinate System, NAD 1983.
The vertical control shall be established to at least third order standards and
referenced fD NGVD 1929.
C. Ana/ytica/ Aerotriangu/ation
Prior to the photogrammetric map compilation, WSI shall expand the network of
control points obtained in the field. This shall be accomplished through analytical
aerotriangulation adjustments of both the 1 "=3000' and 1 "=800' flight scales.
This shall provide supplemental control for setting individual stereo-models in the
photogrammetric plotting instruments.
On the film diapostives prepared from the photography, WSI shall mark both the
field points and the supplemental points required for setting the stereo-models.
For this WSI shall use a Wild PUG point transfer device equipped with a 60-
micron drill for pugging the emulsion of the diapositives. The diapositives shall
then be set in a Zeiss P-2 Planicomp analytical stereoplotter to determine relative
coordinates for each of the pug points. These values, along with the known
ground coordinates, shall be used to compute the ground coordinates for the
supplemental points. This shall be accomplished with either a Zeiss PAT-M or
Zeiss PAT-B fully analytical adjustment program.
D. Digita/ Map Compi/ation (Update and New)
WSI shall then use any or all of its four Zeiss analytical stereoplotters to compile
new and updated digital topographic mapping at 1 "=200' and 1 "=500' with a 2'
contour interval. This shall be accomplished for all of the 83 square mile project
area.
Included within this areas is approximately 19 square miles that were mapped in
1995 at the same scale and contour interval. This area shall be updated by
utilizing analytical stereoplotters having superimposition capability. This shall
allow the new stereo-photography to be superimposed with the 1995 map data
for making all necessary changes (new roads, new subdivisions, etc.) WSI shall
also carefully examine the contours and shall make changes for areas that have
been disturbed.
For the other 64 square miles, WSI shall compile new map data consistent with
the standards used for the original 19 square mile area. This shall include the
following map detail: coordinate grid ticks and values (state plane coordinate
system with latitude-longitude values at sheet corners), contours (2' interval),
spot elevations, road edgesJ major buildings, drainage features, and other major
landmark features.
WSI shall compile the map data directly into digital form using Kork digital
mapping software. Features shall be collected in separate data layers and
defined by codes which assign symbols, colors, pen sizes, and other attributes.
After it is ,compiled, the d!gital data shall be edited and formatted at one of WSI's
Pentium PC workstations. During the edit process, text shall be added, the data
shall be placed in its final layered structure~ and it shall be translated to the
desired format, which for this project shall be AutoCAD, release 14.
Special care shall be taken to ensure that all data is GIS compatible in the event
the City ever desires to convert to a full GIS system such as ARC/INFO. This
shall include closing .polygons~ establishing mad centerlines, ensuring contours
are not broken when annotation is placed, etc.
From the digital map data WSI shall prepare and deliver to the City one set of
approximately 122 mylar plots at 1 "=200'. Each plot will be 24"x 36" in overall
size with a 20" x 30" map area. The plots shall also include a standard title and
border format, similar to the 1995 map sheets, containing such information as city
name, map scale, north arrow~ map location diagram, etc.
In addition to the 1 "=200' mapping, the data will be reformatted, resized, etc. for
use at 1 "=500' scale. This shall include delivery to the City of one set of 28 24" x
36" mylar plots at 1 "=500'. These shall have the same type title and border
format as the 1 "=200' plots.
As well as the map plots, WSI shall also deliver one set of digital files on CD for
both map scales.
All digital map compilation shall meet or exceed the following photogrammetric
accuracy standards:
Ninety percent of all well defined planimetric detail shall be plotted to
within 1/40" at map scale~ and no such feature shall be in error by more
than one full interval.
Ninety percent of all solid-line contours shall be accurate to within
one-half the contour intervalJ and no such contour shall be in error by
more than one full interval.
4
* In areas of dense vegetation (heavy brush, trees, etc.) where visibility of
ground is obscured, the contours shall be shown as dashed lines and
plotted as accurately as photogrammetric methods permit.
* Ninety percent of all spot elevations shall be accurate to within
one;fourth the contour intervalJ and no such elevation shall be in error by
more than one-half the interval.
E. Digital Orthophotos
To produce the digital orthophotos, WSI shall scan a "clean" set of film
diapositives prepared from selected exposures of the aerial photography.
"Clean" refers to the fact that this shall be a separate set of diapositives from
those used for the analytical aerotriangulation and digital map compilation,
The scanning shall be accomplished with a: Leica/Helava DSW300
photogrammetric scanner. The scans shall be made from the 1 "=1300'
photography at no less than 1300 dots per inch for the purpose of producing a 1'
pixel resolution and from the 1 "--3000' .photography at no less than 600 dots per
inch for the purpose of producing a 5' pixel resolution.
To attain standard photogrammetric accuracies~ WSI shall rectify the digitized
imagery on a pixel-by-pixel basis using elevation data from the map compilation
phase of the project. This shall be accomplished with an Autometric IPS
Softplotter and shall result in scale-accurate digital photographic images,
otherwise known as digital orthophotos.
Particular care shall be taken by WSI throughout this phase of the project to
ensure that image densities remain consistent. The imagery shall also be
carefully examined for scratches or other blemishes which shall be corrected with
Adobe Photoshop software.
The digital orthophoto files shall be delivered on CD in a Tagged Image File (TIF)
format with accompanying world files for geo;refarencing purposes. Three sets
of the files shall be delivered to the City.
The orthophotos prepared from the 1 "~1300' aedal photography (1' pixel
resolution) shall correspond to two map facets (6000' x 8000') and shall be butt-
matched Ino overlap). Approximately 65 files (48 megabytes each) shall be
needed to cover the 83 square mile project area.
The orthophotos prepared from the 1 "=3000' aerial photography (5'. pixel
resolution) shall be digitally mosaiced to create on large file of the entire 83
II.
square mile area. This file shall be approximately 180 megabytes in size.
Using the single image file covering the entire project area, WSI shall utilize a
Cymbolic Sciences Light Jet 5000 laserprinter to.produce photographic-quality
hard-copy prints at 1 "=1000'. These shall be printed as single sheets
(approximately 48"x 90") and shall be unmounted and unframed. Three copies
shall be delivered to the City and shall be similar in quality to the photo mosaic
delivered in 1995.
Hardcopy prints shall not be delivered for the 65 higher-resolution orthophotos.
F. Delivery Products
One set of 9" x 9" contact prints from all flight scales
One survey report with description sheets for new monuments
One set of 122 mylar map plots (24"x 36") at 1 "=200' with a
2' contour interval
One set of 28 mylar map plots (24" x 36") at 1 "=500' with a
2' contour interval
One set of digital map files (1 "=200' and 1 "=500') in AutoCAD release
14 format
Three sets of 65 digital orthophoto files (1' pixel resolution) on CD
In a TIF format with accompanying world files
Three sets of one digital orthophoto file covering the entire project area
(5' pixel resolution) on CD in a TIF format with accompanying world files
Three 48" x 90" laser plots from the digital orthophoto file of the
entire pro)ect area.
Schedule
WSI's schedule for performing this work shall be as follows:
Field Reconnaissance and Targeting
Aerial Photography Acquisition
Photo Lab Operations
GPS Control Surveys
Analytical Aerotriangulation
Digital Map Compilation
Image Scanning and Digital Orthophoto Production
Final Deliveries
Jan. 1 - Feb. 15, 2000
Jan. 15 - Feb. 15, 2000
Feb. 15- Mar. 1, 2000
Mar. 1 -Apr. 1, 2000
Apt. 1 - May 1, 2000
May 15 - Sept. 15, 2000
May 15 - Sept. 15, 2000
July 1 - Oct. 1, 2000
III. Fees and Payments
As compensation for the work to be performed under this agreement the City shall
pay WSI one hundred ninety nine thousand seven hundred fifty dollars ($199~750).
WSI shall invoice the City at the end of each month, based on percentage of work
completed according to the following breakdown (no payment shall be due until
completion of the aerial photography):
Black-and-white aerial photography at three scales
(1 "=3000', 1 "=800', and 1 "=1300'). Includes delivery
of one set of contact prints ..................................... $
19,600
Control surveys. Includes locating and targeting
existing control, establishing new GPS control where
necessary, establishing three new pair of intervisible
monuments, and delivery of one survey report with
new monument description sheets ............................... $
23,500
Analytical aerotriangulation for densification of the
control network .............................................. $ 13,450
Digital topographic mapping updates (1 "=200',
2' contour interval) for original map area of
approximately 19 square miles. Includes delivery
of one set of 37 24" x 36" mylar plots and one set of
digital files in AutoCAD format .................................. $
18,430
Digital topographic mapping .(l "=200', 2' contour
interval) for an additional area of approximately 64
square miles. Includes delivery of one set of 85
additional 24"x 36" mylar plots and one set of
digital files in AutoCAD format .................................. $
91,520
Digital topographic mapping (1 "=500', 2' contour
interval) for entire 83 square mile area. Includes
delivery of one set of 28 24" x 36" mylar plots
and one set of digital files in AutoCAD format .......................$
12,450
Image scanning and digital orthophoto production
(1' pixel resolution). Includes delivery of three sets
of 65 image files and accompanying world files on CD ................$
12,350
Image scanning and digital orthophoto production
(5' pixel resolution). Includes delivery of three sets
of one mosaiced image file with accompanying world
file on CD and three 48" x 90" photographic-quality
laser plots ................................................... $
8,450
Total $ 199,750
IV. Guarantee
WSI and its subcontractors shall guarantee the accuracy of all work performed
under this contract for a period of three years upon final delivery of all products.
V. Termination
The City may, at its discretion, terminate the work under this agreement by giving a
seven day written notice. If the project is terminated. WSI shall be equitably paid
for services rendered prior to effective termination notice date, pro-rated on the
basis of completed work.
VI. Additional Provisions
This contract shall not be assignable without the express prior written consent of
the City.
Notices and invoices under this contract shall be sent to the following:
City of Pearland
3519 Liberty Drive
P.O. Box 2068
Pearland, Texas 77588
Attn: John W. Hargrove, P.E., City Engineer
Williams-Stackhouse Incorporated
2118 Mannix Drive
P. O. Box 17066
San Antonio, Texas 78217
Attn: Randall L. Holt, President
This contract is binding on the parties hereto, their successors and assigns.
Each party represents that this contract is entered into lawfully and pursuant to all
necessary approvals and authority.
The performance of this contract shall be in Brazoria County, Texas.
Executed in duplicate originals on the day first written above.
City of Pearland, Texas
Williams-Stackhouse Incorporated
By:
Title: Citv Manager Title:
Date:
Attest:
· z z z z~ ~
0
g ~t~
C)
C)