producing ortho imagery in arcgis...ortho imagery in gis previous workflow with remote sensing...
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Producing Ortho Imagery In ArcGIS
Hong Xu, Mingzhen Chen, Ringu Nalankal
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Agenda
• Ortho imagery in GIS
• ArcGIS ortho mapping solution
• Workflows
- Satellite imagery
- Digital aerial imagery
- Scanned imagery
- Drone imagery
• Q/A
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Ortho Imagery in GISWhat is ortho imagery?
• Varieties of remote sensing data
- Geometric distortions
• Ortho imagery
- Geometric distortions have been corrected
• Ortho Mapping
- Process and technology that products ortho imagery
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Ortho Imagery in GISPrevious workflow with remote sensing imagery in GIS
Raw images Processing Use in GIS
GIS
3rd party Software
• Users to purchase ortho imagery
• Users to purchase imagery software to process
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Ortho Imagery in GISArcGIS integrates photogrammetry into GIS system
• Reduce project cost and production cycle
• Easy to use for GIS users
ArcGIS
Ortho Mapping
Raw images Process and use in GIS
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ArcGIS Ortho MappingCapabilities
• Generate ortho products
- Orthomosaics
- DEM (DTM/DSM)
• Support many types of data
- Satellite images
- Aerial images
- Scanned images
- Drone images
• Advanced License
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ArcGIS Pro Ortho Mapping – 3 Steps
3. Generate
ortho mapping
products
1. Create
ortho mapping
workspace
2. Perform
block adjustment
Input image
collection Orthomosaic
DEM
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1: Ortho Mapping WorkspacesA sub Pro project that mange input, output, and intermediate files for an ortho mapping session
• Manages images using mosaic dataset
• Keeps track of the processing phases
• Support operations
- Create, add, import, copy, delete
• Create from New Workspace wizard
- Satellite, digital aerial, scanned, drone
• Consistent workflow of adjustment and product generation
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2: Adjustment Image matching and triangulation
• Compute control points
- Tie points
- Ground Control Points (GCPs)
- Check points
• Compute adjustment
- Triangulation algorithm for frame camera model
- Triangulation algorithm for RPC model
- Apply transformation to each image
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2: Adjustment Editing GCPs using GCP Manager
• Import GCPs
- Txt, csv, table
- Import GCP photos
• Manually add GCPs from Map
• Entering one tie point
- Auto-generate the rest
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3. Generate Elevation Product using DEM WizardIncludes generating point cloud and interpolate DEM from it.
• Three methods for point cloud generation
- Extended Terrain Matching (ETM)
- Semiglobal Matching (SGM)
- Enhanced Semiglobal Matching (ESGM)
• Output elevation data
- Digital Surface Model (DSM)
- Digital Terrain Model (DTM)
• Use for orthorectification
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3. Generate Orthomosaic Product Using Mosaic WizardSeamline
• Automatically generated seamlines
- Voronoi method
- Disparity method
- Radiometry method
• Manually edit using Topology editing
• Seamline feather with user defined width
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3. Generate Orthomosaic Product Using Mosaic WizardColor Balancing
• Dodging or histogram methods
- Color grid
- 2rd order polynomial
• Calculate color surface from images
• User provide a target surface
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3. Generate Orthomosaic Product Using Mosaic WizardGenerate Orthomosaics and other products
• Orthomosaics
• Orthorectified mosaic dataset
• Tile cache
- Using Tile Cache tools
• Ortho image scenes
- Use Export Mosaic Items tool
• Ortho image tiles
- Use Split Raster tool
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Workflow: Satellite Imagery
• Support many satellite data (39)
- RPC model
• DEM is required for creating workspace
- Local DEM dataset is recommended
• Support processing templates
- Pan, MS, Pansharpen
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Workflow: Satellite ImageryExample: ZY3 Songshan
FWD, NAD, and BWD scenes Generated DTM (10m)
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Workflow: Satellite ImageryExample: ZY3 Songshan
NAD and MS scenes Pan-sharpen orthomosaics
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Workflow: Digital Aerial ImageryCamera table and frame table
• A camera table from internal orientation info
- Focal length, pixel size, principle point
- Image-to-film transform
• A frame table using external orientation info
- Image perspective center
- Omega, phi, Kappa, camera distortion parameters
• Create workspace from
- The two tables
- DEM data
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Workspace: Digital AerialExample: 16 aerial images, Z/I imaging DMC II 230
• Generated orthomosaic
- Generated DTM for orthorectification
- Computed seamlines using disparity method
• Generated DSM for hillshade analysis
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DemoCreating Orthomosaics from satellite images
Creating DSM from aerial images
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Workflow: Scanned Aerial ImagesCamera and frame table
• A camera table from internal orientation info
- Focal length, pixel size, principle point
- Image-to-film transform
• A frame table using external orientation info
- Image perspective center
- Omega, phi, Kappa, camera distortion parameters
• Historical data workflow tools
- Image footprint
- Index map
- Scan
• Create workspace from the 2 tables
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Workflow: Scanned Aerial ImagesExample: 44 photos of year 1965
• 13 GCPs manually added (NAIP as reference)
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Workflow: Drones
• Images with internal GPS (EXIF)
• Images with external GPS table
• Support a library of cameras
- User defined camera parameters
• Elevation (dataset or a constant)
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Workflow: DronesExample 1: Measuring volume for a engineering site
• Data
- 225 images, GSD=0.016
• Processing
- Projection error= 0.55 (pixel)
- GCP = 0.39m z=0.14m
• Generate Orthomosaic
• Generate DSM
- ESGM method
• Measuring volume
- Surface Volume Geoprocessing tool
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Workflow: DronesExample 2: Mapping Crop Condition
• Data
• Adjust
• Generate orthomosaic
• Create water content map
- with raster function (VARI)
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