FLOOD10502

• County: Phillips
• Community: Holyoke
• Basin: South Platte
• Title: Holyoke / Phillips County Floodplain Study Documents
• Floodplain - Doc Type: Correspondence

0~'/25/QO

12:20 FAX [phone]

EagleSean Ine

14J002

Laser Terrain Mapping & Imaging
Tel: [phone] Fax: [phone]

1770 Range Street Unit B, Boulder, Colorado 80301
www.eaglesc8n.com e-mail: [e-mail]

Price Quotation

Date: 2/25/00
P,'oject: Holyokem, Colorado
Project Number: 00RCE007
Customer: Colorado Dept, of Natural Resources - Tom Browning

Project Requirements
Airborne LIDAR terrain mapping and digital imaging of approximately 3 square miles of Frenchman Creek,
near Holyoke, Colorado. Digital product deliverables to include high-resolution Digital Elevation Models
(DEMs), 2-foot interval contour data, planimetric feature data and high-resolution orthorectified images.

Provisions
1. EagleScan will collect LIDAR (Light Detection and Ranging) and Digital Panchromatic Image data using the
EagleScan OATIS system.
2. EagleScan will provide all personnel and equipment required to perform data collection and processing, Project
boundaries defining data collection area will be supplied by customer before contract authorization.
3, Data will be referenced to mutually agreeable National Geodetic Survey high order control stations or other
accessible and acceptable control points specified by customer before contract authorization,

Deliverables
Coordinate Svstem:
1. All data will be delivered in Colorado State Plane coordinate system with NAD83 (horizontal) and NA VDSS
(vertical) datum and units will be in US survey feet unless otherwise specified before contract authorization.
2, Conversion to other standard coordinate systems and datum can be accommodated, usually at no additional cost.
3, Unique or local datum conversions can be accommodated also, but as an optional task. If a special, non-
standard datum is required, details of datum and conversion factor or algorithm will need to be specified before
contract authorization,
4, Geoid conversions are based on GEOID96 model conversion factors on an individual point basis.

DEM Data:
1. Absolute DEM accuracy will be 15cm (6 inches) Root Mean Square Error (RMSE) (or I-sigma) vertical and 1-
meter (-3-feet) RMSE (or I-sigma) horizontal.
2. OEM data are based on a digital elevation model consistent with the US Geological Survey (USGS) National
Mapping Program DEM Accuracy Standard. OEM data is acquired and processed in accordance to the latest
FEMA LIOAR mapping guidelines,
3, Nominal elevation sample spacing will be approximately 3-5 meters (9-15 feet),
4, DEMs consist of a large number of random-sampled elevation points, each containing a northing, easting and
elevation value, Elevation data can also be triangulated into a gridded OEM as an optional task.
5. Vegetation effects will be processed using an automatic removal process, yielding approximately 90-95%
removal of vegetation from data. Effectiveness of automated vegetation removal may decrease under leaf-on
conditions. Low height vegetation, such as shrubs or crop fields, may remain represented as surface elevation
data as well. The vegetation removal process and water features will cause a decrease in OEM resolution,
Additional manual vegetation removal will also be performed,
6, Manual removal of structures and buildings will be performed on the data.
7, Contours at 2-foot vertical interval will be generated by interpolation of the DEM data, Topographic breaklines
will not be collected or processed,

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