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GIS

Geographic Information Services
Director: Geoff Almvig
Information from Space Imaging
Space Imaging's Digital Airborne Imagery System (DAIS-1) collects high resolution, multispectral aerial imagery for applications requiring a high degree of detail and accuracy. The superior detail and accuracy of the imagery produced by DAIS-1 makes it an excellent tool for both small area and linear analysis activities.


Fig 1.Beech Aircraft with DAIS refueling at Skagit Regional Airport.

DAIS-1 FEATURES AND BENEFITS:
Collection Features Provide More Data Content
The main advantage of DAIS-1 is its ability to collect 12 bits of data per light band; thus, giving you 20 times the imagery content over traditional 8-bit systems. Because the 12-bit range can distinguish over 4,000 shades of gray, the shadowed areas of an image can be viewed, displayed, analyzed and mapped.

Another advantage is that DAIS-1 images can be collected on marginal flying days, increasing the ability to meet critical time and project deadlines.

System Capabilities Expedite Processing
The system was designed for fast turnaround of imagery products. The digital nature of DAIS-1 allows processing to begin immediately after the imagery is captured. Traditional aerial systems collect analog imagery, which requires additional processing steps before production can begin. Furthermore, differential GPS data and an inertial measurement unit (IMU) provide exact geographic position and camera attitude information, which also expedites image-processing time.

Calibration Provides High-Quality Image Characteristics
To ensure the radiometric quality of the data, Space Imaging contracted with the NASA Ames Laboratory to perform rigorous sensor calibration for a variety of data collection modes. The consistency and integrity of the images make them optimal for highlighting variations in vegetation and automated image classification.


Fig 2. Inside the plane with the sensor and on board computer to collect and process data.


Fig 3. The sensors pointing out the belly of the plane.

DAIS-1 IMAGERY APPLICATIONS:
With its ability to provide distinction of objects from one-half meter to two-meters in size, DAIS imagery applications are ideal for:
Transportation and utility mapping


LOCATION AND COLLECTION OPTIONS:
The DAIS-1 sensor is mounted aboard a Cessna 421-C airplane that can be deployed from Denver to any location in the Continental United States. The DAIS-1system supports three collection options for customers:

TECHNICAL OVERVIEW

Image Products: Precision digital orthorectified color image mosaicks

Spatial Resolution: 0.5m (1.64ft), 1.0m (3.28ft), and 2.0m (6.56ft)

Geometric Accuracy: 4 meter CE90; 1.9m RMS

Spectral Resolution: B, G, R, NIR = 0.4-0.88 um

Radiometric Resolution: 12 bits per pixel = 4096 gray levels per pixel, per band or 8-bit conversion

Tiling Scheme: DOQQ, DOQQQ or custom

Format: GeoTIFF or ERDAS IMG

Projection/Datum: Wide variety available

Imagery Correction: Lens distortion, dark noise, optical vignetting, detector non-uniformity, terrain variation and tonal balance