NSGIC

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NSGIC
NATIONAL STATES GEOGRAPHIC INFORMATION COUNCIL
2105 Laurel Bush Rd. Bel Air, MD 21015
443-640-1075 www.nsgic.org
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Imagery LiDAR Data Volumes Jay Arnold
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Data Storage Byte Terms

• Kilobyte (kb) 1024
• Megabyte (mb) X 1,000
• Gigabyte (gb) X 1,000
• Terabyte (tb) X 1,000
• Petabyte (pb) X 1,000
• Exabyte (eb) X 1,000
• Zettabyte (zb) X 1,000
• Yottabyte (yb) X 1,000

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Data Storage Rules of Thumb

• Always Double Your Estimate!
• Imagery Size Is 4x File For Each 2x Resolution
  Jump
• So 6-inch Pixel 4X Size Of 1-foot Pixel
• Collars/Buffers Increase Size Quickly
• 10 Collars 1.44X Size
• 10 On Top Bottom 1.2
• 10 On Left Right 1.2, So 1.2x1.2 1.44

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Data Storage Rules of Thumb

• 16-bit Files Are 2X 8-bit
• Many Clients Want To Have Both The 8-bit Finished
  Product And The 16-bit Raw Data
• So A 400mb 4-band Stack File At 8-bit 1.2gb For
  Both 8-bit And 16-bit
• Popular Compression Ratios Include
• 151 (USDA NAIP)
• 201
• 501

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Data Storage Rules of Thumb

• Imagery Production 5X Storage Requirement of
  Final Products
• LiDAR Production 4X Storage Requirement of
  Final Products
• FireWire or Other Hard Drive Storage is Great for
  Transfer/Delivery
• LTO3 Tapes Make Backup Easy
• SAN-Based Storage Suggested

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Imagery Storage Requirements

• 3.75-minute DOQQ 1M
• Bw .Tif 40-45mb
• RGB Or CIR .Tif 140-150mb
• 7.5-minute DOQQ 1M
• Bw .Tif 140-150mb
• RGB Or CIR .Tif 550-600mb
• 5,000ft X 5,000ft 1-foot
• RGB Or CIR .Tif 75mb
• 4-band Stack 100mb

• 5,000ft X 5,000ft 6-inch
• RGB Or CIR .Tif 300mb
• 4-band Stack 400mb
• 5,000 X 5,000ft 3-inch
• RGB Or CIR .Tif 1.2gb
• 4-band Stack 1.6gb

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LiDAR Storage Requirements

• LiDAR Data At 5M DEM ¼ Quad
• DEM 10mb
• 2-Foot Contours Breaklines 35mb
• Edited Point File 20mb
• Raw Point File 30mb
• TOTAL 100mb per DOQQ Area
• LiDAR _at_ 1M DEM 25X 5M DEM
• DEM 250mb

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Data Storage by State Example

• Louisiana
• Size is 52,000 sq mi (land water)
• 3500 DOQQs
• 500gb for RGB or CIR 1M DOQQs
• 350gb for 5M DEM Other LiDAR
• 35gb for DEM alone
• At 1-ft pixel 5.4tb
• At 6-inch pixel 21.6tb
• At 1M DEM LiDAR 875gb for DEM alone

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Pixel Size by State ExamplePost-Katrina New
Orleans
1-ft ADS40
6-Inch DMC
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5 m Bare-Earth LiDAR Model
5 m Bare-Earth LiDAR Terrain Model
1 m Bare-Earth LiDAR Terrain Model
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Thank You!
Imagery LiDAR Data Volumes Jay
Arnold jarnold_at_3001inc.com 256.327.9377