wisconsin aerial imagery ted koch, wisconsin state cartographer’s office wlia 2005 annual...

Ted Koch, Wisconsin State Cartographer’s Office

WLIA 2005 Annual ConferenceFebruary 24th, 2005

Wisconsin Aerial ImageryWisconsin Aerial Imagery

Wisconsin Aerial Imagery- 2005 -

Ted Koch, State CartographerWI State Cartographer’s Office

Univ. of Wisconsin-Madisonwww.wisc.edu/sco




High Resolution Images(< 1 meter; i.e. 6”, 12”, 18”)

• 2005 a banner year for digital orthophoto acquisition.

• Approx. 60% (~20 m acres) of state’s area.

• Value - approx. $2.5 million.




What’s a Digital Orthophoto?

• Aerial photo– Captured by film-based or digital camera.– Contains distortions due to differences in

terrain elevation and aircraft position.– Does not have constant scale across the

image.




What’s a Digital Orthophoto?

• Digital Image produced by:– Geometric correction of the image– Unwarping the effects of distortion due to

terrain and camera position.




What is a Digital Orthophoto?

• Produced from a variety of inputs:– Digital image– Control – values of known points– Terrain Model – DEM or DTM– Image rectification to terrain model, and fit to a

map projection– Metadata




2005 Ortho Acquisition

• Statewide

• Local (counties and municipalities)




Statewide

• NAIP (National Agricultural Imagery Program)

– Nationwide program, administered by the USDA-FSA

– Acquired for crop compliance programs– Flown during growing season




Statewide

• NAIP Products:– Natural color – Two resolutions:

• 1-meter ortho (matches w/i 3-meters of DOQQ reference image)

• 2-meter geo-rectified (matches w/i 10 meters of DOQQ reference image)




NAIP Image

Prescott, Pierce County

(from MN

coverage)




Statewide

• NAIP Products: 1-Meter Ortho– Format: DOQQ or compressed county

mosaic– UTM coordinate system, NAD 83– 10% cloud cover allowed– Base for “common land unit boundaries”




Statewide

• NAIP in Wisconsin - 2005:– 1-meter statewide planned– Funding:

• FSA - 80-90%• Cooperative funding from state organizations:

– DNR - $150,000

– DATCP - $20,000

– 10 WI counties - $~$5,000 each




Statewide

• NAIP Wisconsin contact:Larry CutforthUSDA-FSA, GIS Specialist608/662-4422, Ext [email protected]




Local




Black & White Orthos1” = 100’ scale

18” & 6” resolution(Photos courtesy Ayres Assoc)




Natural Color Orthos1” = 50’ & 1” = 100’ scale

3” resolution(Photos courtesy Ayres Assoc)




CoordinationAccomplished thru three major regional consortia:- SEWRPC- EC/NC/BL RPC- SW Counties

- Next presentation will cover in more detail




Aerial Technologies

• Traditional:– Camera & film – Scanning– Ground control + ground targets




Aerial Technologies

• Recent:– Airborne GPS (reduces need for ground control)

– Forward motion compensation and inertial measurement units (IMUs)

– Digital cameras (cutting edge)




Digital Camera




National Activities

• What’s under discussion:– NSGIC Proposal - Funding– USGS Proposal - Funding– FGDC/Am Nat’l Stds Institute (ANSI) -

Digital Ortho Framework Standard – Currently in draft review (July, 2004)




Conclusion

• Impacts – 2005, lots of data (statewide & local)

• Future scenario(s)– Long term vision, & improved coordination– Stable and predictable funding– Plan for 2010– Technological advances (i.e., digital cameras, near

real-time image processing, etc.)




Questions ?

wisconsin aerial imagery ted koch, wisconsin state cartographer’s office wlia 2005 annual...

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