mapping and serving alaska’s first statewide digital orthoimagery base map

Mapping And Serving Alaska’s First Statewide Digital Ortho-Imagery Base Map

PETER HICKMAN – Geographic Information Network of Alaska

TONY FOLLETT – AeroMetric

July 24, 2012 – Esri User Conference

Assignment: Provide satellite-based 1:24,000 orthoimagery of entire state

Project Team

Project Scope

Standards

Projection Albers Equal Area Conic Projection

Datums NAD83 CORS96 Epoch 2003 NAVD88 Geoid99-Alaska

Accuracy NMAS, CE90 40 feet (12.2m)

Cloud cover < 10% per Spot satellite scene

Schedule

Start: Aug 5, 2010 Project Management Plan

2nd version April 30, 2011 Pilot Project: Completed 2011 Source Imagery & Metadata

10 working days after collection Orthomosaic imagery tiles &

supporting information Apr 30, 2011, Feb 28 2012, 2013,

2014 – subject to revision Project completion: June 30, 2014

Deliverables

1. Project management plan including team organizational initiatives2. Source imagery and metadata3. Orthomosaic imagery tiles, natural color & panchromatic with metadata

a. DEMb. AT resultsc. Natural color datad. Panchromatic data

4. Orthomosaic imagery tiles, color infra-red with metadata5. Project horizontal and vertical control

a. Existing controlb. Newly acquired control

6. QA / QC reports7. Production files

NOTE: Options for license uplifts and other deliverables

Geographic Area & Tile Sizes

1,561,622 sq km including

1-km buffer

4,608 tiles, 20K x 20K

meters, 8K x 8K 2.5m pixels

Vertical Analysis of NED DEM

FGDC Accuracy

84 vertical points

RMSE 7.8 m

NSSDA 15.2 m

Maximum 22.9 m

Example Accuracy Results (meters)

Production Status

Year 1 Year 2

Scenes Collected 576 352

Tiles Produced 854 751

Percentage of Project 18% 17%

Challenges – use of existing DEMS Yukon Flats – shaded relief

NED base data

1/3 arcsec NED Nov/Dec 2010from LiDAR

Additional Information

“The Alaska Statewide

Mapping Project”

Professional Surveyor, Aerial

Mapping March 2011 Issue, p 16

Thank you!