Alaska Statewide Orthoimagery Program Update

TONY FOLLETTFEBRUARY 22, 2013

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

Topics for Today

Review Team, Scope, Deliverables

Results Years 1 & 2 Progress & Accuracy

Year 3 Draft Production Plan New Controlled Imagery Process DEMs Analyses Challenges Decisions Ahead Data Access

Alaska Statewide Digital Orthoimagery Team

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

Scope - Schedule Start

Aug 5, 2010 Project Management Plan

Completed 2011 Pilot Project

Completed 2011 Source Imagery & Metadata

10 working days after collection Orthomosaic imagery tiles & supporting information

Spring 2011, 2012, 2013, 2014

Project completion June 30, 2014 (note 2013 is last imagery collection season)

Scope - Deliverables1. 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 filesNOTE: 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

Production Tracking System

Example Deliverables

Fairbanks & Vicinity

Imagery

Example Deliverable Control Record

Example Deliverable Merged DEM

576 (288 bundles) Scenes Collected and Approved 854 Tiles Produced and Approved 18% of Project

Year 1 Tiles Produced

Year 1 Accuracy Results – 11 Blocks

Block Name No. Points RMSE X RMSE Y RMSE H CE90 CE95 NSSDA

CM1 22 2.986 2.495 3.892 5.694 6.494 6.709

CM3_Pilot 49 1.684 1.992 2.608 3.766 4.296 4.499

CM3_South 17 2.313 2.923 3.728 5.082 5.796 6.409

JU1_East 10 6.067 2.552 6.582 8.782 10.016 10.548

JU1_West 7 2.512 2.711 3.696 5.889 6.717 6.392

NM1 23 1.758 1.359 2.222 3.271 3.731 3.815

NM2 64 2.158 1.791 2.804 3.722 4.246 4.833

NM2_East 13 1.336 2.274 2.638 2.591 2.955 4.418

SM1 26 2.035 1.589 2.582 3.439 3.923 4.435

SM2_East 16 1.652 1.588 2.291 3.162 3.607 3.965

SM2_West 18 2.458 1.542 2.902 2.827 3.225 4.896

  265 2.451 2.074 3.268 4.384 5.001 5.538

Year 1 Accuracy Results

412 (206 bundles) Scenes Collected and Approved 752 Tiles Produced and Approved (1606 Total) 35% of Project (cumulative Years 1 & 2)

Year 2 Tiles Produced

Year 2 Accuracy ResultsBlock Name No. Points RMSE X RMSE Y RMSE H CE90 CE95 NSSDA

CM1 29 2.037 2.812 3.473 4.673 5.330 5.935

CM1-Island None            

CM2-gap1 8 2.029 1.781 2.700 4.348 4.959 4.663

CM2-gap2 21 4.776 2.305 5.303 4.575 5.218 8.666

CM3-gap1 19 2.153 2.350 3.187 4.840 5.520 5.511

CM3-gap2 24 2.629 2.305 3.497 5.084 5.798 6.039

NM1 6 2.274 2.508 3.386 2.968 3.385 5.853

NM1-gap1 None            

NM1-gap2 6 2.463 2.789 3.721 3.419 3.900 6.428

NM2 None            

NM2-gap1 3 1.889 1.293 2.290 2.069 2.360 3.895

NM2-gap2 13 1.839 2.091 2.785 3.363 3.836 4.810

NM2_East 6 1.430 2.135 2.569 2.917 3.327 4.362

SM1 6 1.971 1.549 2.507 3.678 4.195 4.308

SM1-gap1 None            

SM2_East 10 1.547 1.404 2.089 3.143 3.585 3.612

SM2_West 9 3.570 2.040 4.112 6.192 7.062 6.866

KP1 19 1.981 2.412 3.121 4.333 4.943 5.376

ST1 12 1.598 2.230 2.744 3.623 4.132 4.685

Year 2 Accuracy Results

Year 3 Spot Scenes Acquired An Additional 168+/- Scenes Were Accepted 65+/- Scenes are on Hold for Production Later 63+/- Off Spec Scenes accepted for use in 2013

Year 3 Draft Production Plan Production will build on Year 1 & 2 Blocks Production blocks still need to be defined New control points will be identified

Year 3 Production Plan Detail

Controlled Imagery Flight Path

Controlled Imagery Flight Path

Controlled Imagery Flight Path

Controlled Imagery Flight Path

TerraPOS is a GPS post-processing software that delivers better than 5 cm positional accuracy of an airborne kinematic trajectory without base station. It works anywhere in the world.

Airborne Imagery Control

Controlled Imagery Atka – Nov. 21, 2012

Bechivin Bay Nov. 21, 2012

DEM Sources NED 2 Arc Second NED 1/3 Arc Second Copper River Rainy Pass Merrill Pass Lake Clark Thompson Pass Chickaloon Anch / Eagle R. / Eklutna Lidar Portage Girdwood Lidar Anaktuvuk Pass Atigun Pass GMTED2010 Alaska & Richardson Hwys St. Paul & St. George Bagley Juneau Augustine Island Katmai

Vertical Analysis of NED DEM

FGDC Accuracy84 vertical pointsRMSE 7.8 mNSSDA 15.2 mMaximum 22.9 m

DEM Difference Map IFSAR sub NED

DEM Difference Map IFSAR sub NED – Detail

DEM Difference Map Mat-Su Lidar sub IFSAR

DEM Difference Map Mat-Su Lidar sub IFSAR - Detail

Challenges – Imagery Collection

Challenges – Imagery Collection

Challenges – Haze

Challenges – Minimizing Cloud Effect

Challenges – use of existing DEMS

Yukon Flats – shaded relief

1/3 arcsec NED Nov/Dec 2010from lidar

NED base data

Challenges – use of existing control

Challenges – Boundary Issues Initial Boundary not accurate – based on old data

Challenges – Gaps

Challenges – Off Spec Scenes Example of an Off Spec Scene – 21.3° Sun Angle

Decisions Ahead

Imagery

2013 final collection year

Options to fill remaining imagery gaps

Accuracy

IFSAR DEMs will update current NED

Analyze improvements from ortho reprocessing

Quality

High value areas or changing areas

Refresh schedule Higher resolution

imagery and/or DEMs

Stakeholders Destination

Professional Surveyor, Aerial Mapping March 2011 Issue, p -16

“The Alaska Statewide Mapping Project”This is the next step in a challenging task that began nearly 300 years ago

Thank You! Lituya Mountain Landslide