Esri Image Server:Making Scanned Maps Accessible
Aileen Buckley
Outline
• Why- There are lots of scanned maps and they have many uses
• How- Scan
- Structure
- Create Mosaic datasets
- Publish as Image Service
- Use in WebMaps
Scanned Maps
• Typically maps created from mapping agencies- Topographic maps
- Historic scanned maps
- Navigation maps
Uses of scanned map collections
• Authoritative information source
• Record for land resource management- Forest plot perimeters
- Wetlands
- Agriculture
- Glaciers
- Land/water boundaries
- Political boundaries
• Historical analysis
• Navigation
• Adventure/exploration
How to get the data?
• Some can be downloaded- Eg from USGS
- Formats- TIFF, SID
- Compressed, Uncompressed
- 1-bit, 8-bit, color map
- Georeferenced?
• Scan- Flat bend / Large Format
- RGB, Pan
- 300-600dpi (best to test)
-
Management Considerations
• Archive the Raw (uncompressed scans)
• Store as- TIF with JPEG compression
- RGB compression (not YCbCr)
- Test Q values, depend on content (typically about Q80)
- Create Pyramids
- Use ArcGIS CopyRaster (or FWTools)
- Can use other formats- But compressed TIF is fast, and good and open
Georeferencing
• Use the ArcGIS Georeference tool
• Ensure appropriate projection and datum are set- Set TIF file as “read only”
• Use Update Georeferencing (not Rectify)- Set as Projective, or 2nd Order
- Will create associated AUX.XML
• Multiple methods to help automate
• For large volumes consider QuadG
• Do not reproject or rectify
• Do not clip borders/legends
Scanned map example
Scanned map example
What you want see
Scanned map example
What you want hidden
But not always – there is valuable info here!
How to Manage collections & Metadata
• Individual scans can be added directly to ArcGIS- Will perform required reprojection
• Use Mosaic Datasets for collections of scanned maps
What is a mosaic dataset?
• A geodatabase data model used to catalog, process, visualize and share your collections of raster, imagery, and lidar data
• Indirect data management- Points to the data
- Contains metadata
• Unlimited size
• Provides dynamic mosaicking
• & on-the-fly processing
• Used as a catalog and an image
• Served as an image service
Simple way to make a mosaic dataset
• Create FileGeodatabase
• Create Mosaic Dataset
• Add Rasters – Point to folders that contain the scanned maps
• Edit footprints
• Add attributes
• Build overviews
• Modify properties
CreateMosaic Dataset
Click icon to insert Picture
Demo
Automation – Further simplifies the process
• On the ArcGIS Resource Center
• Example of how to automate and simplify the process
• A toolbox and scripts (MDCS)
• 6 tool & 80 parameters
• Customizable
Publishing the mosaic dataset as an image service
• Used for analysis and as background
• Best quality – On-the-fly processing
• Most functionality – Dynamic mosaicking
• Optionally Register with ArcGIS Online
• Use in web maps and apps
• Query the collection (catalog)
• Can enable Export and Download
Publishing as an Cached Map Service
• Creates Static Background
• Loose functionality
• Simple background
• In ArcGIS for Desktop- Cache
- Package
- Upload
• In ArcGIS Online- Publish & Share