Horizons, Inc.
20030629
sht_13
One
Vector and Raster Digital Mapping Data
Denver, Colorado
Bureau of Reclamation, Upper Colorado Regional Office
None
Unknown
Horizons, Inc. was contracted by the Bureau of Reclamation to provide accurate digital elevation and orthophotogrammetric data. The project encompassed an area of approximately 20 square miles. The photogrammetric process began with black and white aerial photography obtained by subcontractor Walker & Associates of Seattle, Washington on October 23, 2002 at 1:12000 photo scale utilizing airborne GPS control. LiDAR acquisition was performed by Horizons, Inc. on October 30, 2002 at 6000' AMT. The Cessna 310 was equipped with an LH System ALS40 LiDAR system including an inertial measuring unit (IMU) and a dual frequency airborne GPS receiver. LiDAR data was collected with 2 meter nominal post spacing and +/- 15 cm vertical accuracy. Ground control survey was provided by the Bureau of Reclamation. The original black and white film was scanned at 14 microns. Aerotriangulation of the photography was performed utilizing Albany Aerotriangulation Software. A final AT Report summarizing adjustments was produced and AT solutions for the controlled photography were provided in Z/I software compatible file format. LiDAR data was processed to create an elevation model and orthophoto production. LiDAR data processing included removal of points on vegetation and buildings. LiDAR data sets produced included raw/multiple return, first return only, processed (bare earth) and 2 meter grid of the bare earth. A LiDAR Report summarizing processing procedures was produced. Digital orthophotography with 0.2m pixel resolution TIFF format was produced.
For the intended use of Bureau of Reclamation
This metadata document is intended to encompass the entire mapping area. Bounding coordinates are for all 18, while row and column counts refer to each individual orthophoto.
20021001
20030630
Publication Date
None planned
-123.7367
-123.7070
47.5326
47.5127
None
Aerial Photography
LiDAR Acquisition
Orthophoto
None
Quinault River
Washington
None
None
Bureau of Reclamation, Upper Colorado Regional Office
Jennifer Bountry, P.E. and Matt Jones
Hydraulic Engineer and GIS Specialist
mailing and physical address
Geophysics Technical Service Center, 6th & Kipling, D-8330, Bldg67, Rm1079
Denver
Colorado
80225
United States
303-445-3614 (Jennifer Bountry), 303-445-3198 (Matt Jones)
303-445-6351, 303-445-6507
jbountry@do.usbr.gov, mjones@do.usbr.gov
unknown
Windows NT 4.0
The airborne GPS data was processed as a kinematic survey, using both forward and reverse processing techniques. The IMU data was processed using POSProc software provided by Applanix Corporation. The X, Y, Z, omega, phi, and kappa for each photograph were calculated and the final adjustment of this block was solved using Erio Technologies ALBANY software(ALBANY is a simultaneous least squares bundle adjustment).
None
None
The horizontal RMS for the airborne GPS is: X - RMS = 0.225 feet Y - RMS = 0.329 feet, X-Y vector is 0.399 feet.
The vertical RMS for the airborne GPS is: Z - RMS = 0.222 feet. The vertical RMS for the LiDAR data is 0.147 feet.
Horizons, Inc.
20030629
Quinault River, Washington Aerial Mapping and Orthophotograpy
12000
Black and White Aerographic 2405 Film
20021023
Ground Condition
None
None
Quality Control Procedure Scanner:Intergraph PhotoScan TD Photo Digitizing System. Scanner Geometric Calibration:Standard Deviation(sigma)=1.6710356970 Root Mean Square X=1.9970393211 Root Mean Square Y=0.9624905604 Scanner setting: Transmissivity: 0.0151 0.6610 Film Density: 1.8210 0.1778 Gamma: 1.75 Film was kept in airtight containers prior to scanning. Both the base and emulsion sides of the film were cleaned using a tacky roller system prior to scanning. Color adjustment was achieved by visually matching the tone, contrast, and brightness to the original film. Each scanned image was checked computationally for missing data. Quality Control Procedures for LiDAR Processing: AeroScan LiDAR timed reflection data and the IMU SBET flies were processed together using LiDAR processing software. The data set for each flight line was checked for data gaps between overlapping flightlines, and tension/compression areas (areas where data points are more or less dense that the average project specified post spacing). LiDAR data was collected for bi- and cross- directional flight lines over an airport prior to acquisition of the project area. Comparative analysis of the data produced a preliminary omega,phi,kappa correction. LiDAR data was processed and evaluated until angles met project specifications. All flight lines (airport and project) were checked and verified for vertical accuracy of 15 cm. An intensity raster for each flight line was generated and verified that intensity was recorded for each LiDAR point. Static survey ground control points at the airport were compared to the LiDAR data set and the LiDAR data was vertically biased down to the ground. Lidar data in overlap areas of project flight lines was removed. The raw LiDAR data set was processed through a minimum block mean algorithm and points were classified as either bare earth or non-bare earth. User developed macros that factor mean terrain angle and height from the ground were used to determine bare earth point classification. A 2D edit (surfacing) process ensures the accuracy of the automated feature classification. Imagery, intensity of the LiDAR reflection and tin-editing software were combined to assess points. LiDAR points were classified into bare earth, top of canopy, intermediate canopy, buildings, noise, water, miscellaneous structures or unclassified points. 2D surfaced LiDAR data and stero imagery was edited in softcopy photogrammetric workstations with 3D viewing and compilation capibilities. Contours generated from the LiDAR data were compared to the imagery. Breakline features, water features and planimetric data were collected. Data points remaining on structures and/or vegetation and data falling within water features was removed. LiDAR data erroneously removed during the surfacing process was included. Quality Control Procedures for orthophoto production: Individual orthophotos were mosaiced into a regional database and the resulting orthophoto composite was visually inspected for tone balance and image distortion. The final orthophotos were visually inspected for accuracy and consistency.
None
20030629
Mary Bosworth, P.E.
Horizons,Inc.
Project Manager Horizons Job #03-5816
mailing and physical address
3600 Jet Drive
Rapid City
South Dakota
57703
United States
605-343-0280
605-343-0305
bosworth@horizonsinc.com
8am-5pm Mountain Time
Raster
Pixel
11000
11100
2
Transverse Mercator
0.9996
-123.0000
0.0000
500000.0000
0.0000
Row and column
0.1
0.1
Meters
NAD83
GRS 1980
6378137.0000000
298.26
Walker & Associates - Camera#140241,Serial#134668,CFL 153.742
Orthophoto Pixel Size = 0.2 meter
None
Bureau of Reclamation
Jennifer Bountry, P.E. and Matt Jones
Hydraulic Engineer and GIS Specialist
mailing and physical address
Geophysics Technical Service Center, 6th & Kipling, D-8330, Bldg67, Rm1079
Denver
Colorado
80225
United States
303-445-3614 (Jennifer Bountry), 303-445-3198 (Matt Jones)
303-445-6351, 303-445-6507
jbountry@do.usbr.gov, mjones@do.usbr.gov
unknown
Quinault River, Washington Aerial Mapping and Orthophotography
Unknown
20030629
20030629
Horizons, Inc.
Mary Bosworth, P.E.
Project Manager Horizons Job #03-5816
Mailing and physical address
3600 Jet Drive
Rapid City
South Dakota
57703
United States
605-343-0280
605-343-0305
bosworth@horizonsinc.com
8am-5pm Mountain Time
FGDC CSDGM
FGDC-STD-001-1998