Sacramento Regional Digital Orthophoto Project

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Sacramento Regional Digital Orthophoto Project

• Roger Exline, GIS Manager
• Sacramento County
• Kallen Bailey, Director of Production
• ImageAmerica Corporation

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Background

• Sacramento Regional GIS Cooperative
• Absolute, Relative and Referential Accuracy
• Combined several image acquisition projects into
  a single jointly-funded project
• Support of several public safety applications
• Desire for annual updates

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Project Overview

• The intent of this RFP is to solicit proposals
  from vendors that utilize various technologies so
  that the project team can qualitatively compare
  differences in positional accuracy, resolution,
  overall usability, cost and conversion time
  frame.

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Project Participants

• Sacramento County
• Sacramento Area Council of Governments (SACOG)
• Sacramento Municipal Utility District (SMUD)
• City of Sacramento
• Cal-Trans
• Sac-Yolo Mosquito Abatement
• Sacramento Metropolitan Fire District
• Sacramento Area Flood Control Agency (SAFCA)

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Aggressive Project Schedule

• 1/25/01 Release of RFP
• 2/16/01 Contractor selected
• 2/26/01 Contract signed
• 3/12-13/01 Aerial mission flown
• 5/15/01 TIFF Imagery delivered

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Cost and Schedule Comparisons

• ImageAmerica 4/26/01 99,900
• A 2/22/02 402,875
• B 6/30/01 575,470
• C 12/6/01 584,430
• D 11/26/01 598,150
• E 7/27/01 612,750

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Coordinate Accuracy QC
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Miscellaneous Project Facts

• Imagery covers approx. 1,175 square miles
• Index Grid is CA State Plane NAD83 Zone 2
• 5,461 Individual GeoTiffs _at_ 24 MB ea. on 232
  CDs (131 GB)
• 5,461 Individual MrSids compressed _at_ 201 (1.2
  MB ea. for a total storage of 6.5 GB)
• 11 images either did not pass QC or could not be
  opened from the delivered CDs and were redone

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Current Uses of the Orthos

• Verification of spatial accuracy of cadastral
  layers
• Verification of census block boundaries in
  support of legislative redistricting
• Law enforcement event planning
• Identification of vineyard areas (glassy-winged
  sharpshooter)
• Determining access and egress routes in rural
  areas in support of fire suppression
• Development of pre-fire plans for commercial and
  mercantile development
• Use by private consultants, engineers and
  developers

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What Participants Are Saying

• We got a very good product for a very reasonable
  price. Maria MacGunigal, GIS Coordinator for
  the City of Sacramento
• It has had great value, SMUD has already had
  four departments gain great benefits from its
  use. Jim Hayes, SDIT Project Manager for SMUD
• SACOG sees these orthos as an essential
  infrastructure layer for municipal GIS. Joe
  Concannon, SACOG

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Conclusions

• Orthos have been adopted as a foundation layer
  for Sacramento Regional GIS
• Short project lifecycle guarantees the use of the
  most up-to-date orthos and a quicker return on
  investment
• Reasonable project cost has made it much easier
  to add new participants
• Entire County ortho layer will be updated on an
  annual basis

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New Participants

• Sacramento Regional Transit District
• City of Elk Grove
• City of Citrus Heights
• ???