Hi-resolution Data in a Low-resolution Landscape:

Transcription

1 Hi-resolution Data in a Low-resolution Landscape: Squeezing More Value from Digital Airphotos when Ancillary Data are Lacking Andrew Balser, October 17, 2008

2 Airphotos versus Satellite Imagery: Trade-offs for high-resolution information Airphotos -Cost * -Adaptability -Specs -Timing -Weather -Resolution * Satellite Imagery -Cost * -Radiometric measurement -Single-frame coverage area -Automation *

3 Airphotos versus Satellite Imagery: Trade-offs for high-resolution information Airphotos -Cost * -Adaptability -Specs -Timing -Weather -Resolution * Satellite Imagery -Cost * -Radiometric measurement -Single-frame coverage area -Automation * Bottom line: There are situations where aerial photography is still the best choice

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5 Airphotos versus Satellite Imagery: Thermokarst Project Airphotos -Cost $3, Adaptability -Timing -Weather -Resolution * Satellite Imagery -Cost ~$10, $20, Radiometric measurement -Single-frame coverage area -Automation * Bottom line: There are situations where aerial photography is still the best choice

6 Airphotos versus Satellite Imagery: Thermokarst Project Airphotos -Cost $3, Adaptability -Timing -Weather -Resolution * Satellite Imagery -Cost ~$10, $20, Radiometric measurement n/a -Single-frame coverage area -Automation * Bottom line: There are situations where aerial photography is still the best choice

7 Airphotos versus Satellite Imagery: Thermokarst Project Airphotos -Cost $3, Adaptability -Timing -Weather -Resolution * Satellite Imagery -Cost ~$10, $20, Radiometric measurement n/a -Single-frame coverage area -Automation * Bottom line: There are situations where aerial photography is still the best choice

8 Airphotos versus Satellite Imagery: Thermokarst Project Airphotos -Cost $3, Adaptability -Timing -Weather -Resolution * Satellite Imagery -Cost ~$10, $20, Radiometric measurement n/a -Single-frame coverage area -Automation * Bottom line: There are situations where aerial photography is still the best choice

9 Airphotos versus Satellite Imagery: Thermokarst Project Airphotos -Cost $3, Adaptability -Timing -Weather -Resolution * Satellite Imagery -Cost ~$10, $20, Radiometric measurement n/a -Single-frame coverage area -Automation * Bottom line: There are situations where aerial photography is still the best choice

10 Airphotos versus Satellite Imagery: Thermokarst Project Airphotos -Cost $3, Adaptability -Timing -Weather -Resolution * Satellite Imagery -Cost ~$10, $20, Radiometric measurement n/a -Single-frame coverage area -Automation * Bottom line: There are situations where aerial photography is still the best choice

11 Airphotos versus Satellite Imagery: Thermokarst Project Airphotos -Cost $3, Adaptability -Timing -Weather -Resolution * Satellite Imagery -Cost ~$10, $20, Radiometric measurement n/a -Single-frame coverage area -Automation * Bottom line: There are situations where aerial photography is still the best choice

12 What sort of airphotos? In our region there are no high-res or contemporary DEM products DEMs from the National Elevation Dataset (NED) Interpolated from 1 : 63,360 contour lines on USGS quads many not updated since 1950s Automated orthorectification not really an option for high-resolution imagery (unless we want to fly an ifsar or LiDAR DEM as well) That leaves us with a stopgap method....

13 What sort of airphotos? In our region there are no high-res or contemporary DEM products DEMs from the National Elevation Dataset (NED) Interpolated from 1 : 63,360 contour lines on USGS quads many not updated since 1950s Automated orthorectification not really an option for high-resolution imagery (unless we want to fly an ifsar or LiDAR DEM as well) That leaves us with a stopgap method For now it works, but I look forward to the day when it s no longer necessary....

14 Camera: Nikon D2X Plane: Cessna 185 (192 shown)

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31 Questions?