Basic Stereo Pair Imagery
Basic Stereo Pair Imagery products are designed for users with advanced image processing capabilities and photogrammetric tools. This product is ideal for Digital Elevation Model (DEM) generation, 3-D visualization and feature extraction applications. Basic Stereo products are collected in-track, meaning on the same orbit, and are acquired at angles optimal for stereo viewing and manipulation.
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Features |
Benefits |
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High three-dimensional accuracy
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More accurate mapping and terrain modeling results |
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High resolution
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Provides high density terrain posting to produce highly detailed surface data |
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Largest image swath collection size
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Collect larger area in stereo faster. Deliverable unit size is at least 17.6 wide x 14 km long (246 km2) |
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High radiometric response
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Improve feature identification in darker or brighter areas such as building shadows or snow |
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Open systems
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High-resolution stereo imagery projects can be run quickly and easily using commercial photogrammetry tools |
Spatial and Spectral Resolution
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Panchromatic |
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Spectral Characteristics |
Black & White - WV1: 400 to 900 nm |
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Pixel ResolutionA |
WV1: 50 to 75 cm (1.6 to 2.5 ft) |
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Imagery AccuracyB |
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Horizontal |
6.5 m CE90 at nadir |
Typical performance in the range of 4.0 - 5.5 m CE90 at nadir |
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Vertical |
6.5 m LE90 with these numbers |
Typical performance in the range of 6.5 - 8.0 m LE90 |
A - Pixel resolution varies across the image due to off-nadir viewing angle. Pixels closest to nadir have a better resolution than those farthest from nadir. DigitalGlobe will collect stereo imagery at up to 35° off nadir.
B - These numbers exclude terrain and off-nadir angle affects and are based on a convergence angle of approximately 35 degrees.
Processing
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Radiometric Corrections |
Sensor Corrections |
Resampling Options |
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Order Parameters |
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Product Type |
Panchromatic |
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Image Bits/Pixel |
8 or 16 bits |
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File Formats |
GeoTIFF 1.0, NITF 2.1 or NITF 2.0 |
Deliverables
Basic Stereo Pair Imagery can be acquired directly from the DigitalGlobe archive or you can submit a new collection request. Basic Stereo is delivered in 17.6 by 14 km units. Minimum purchase size is 15 km wide x 14 km long.
Products are delivered by FTP or on DVD with all the Image Support Data files needed for photogrammetric processing, including a stereo file that identifies the images in the pair and collection angles, attitude and ephemeris data, geometric calibration, camera model, image metadata, radiometric data, and rational functions.
* Distribution and use of imagery at better than .50 m GSD pan and 2.0 m GSD multispectral is subject to prior approval by the U.S. Government.