Imagery & Video Product Guide
Version 1.1.1 Updated April 29, 2014
Document number: 1006-142
About Skybox Skybox Imaging empowers global businesses to make better decisions with timely, high fidelity imagery and infinite analytics. By combining the power of web technologies and a constellation of high-resolution imaging satellites, Skybox is generating a unique data source describing daily global activity with timely, accessible, sub-meter color imagery and high definition video of the Earth. Founded in 2009, Skybox Imaging is backed by leading venture firms and comprised of internet and aerospace professionals. For more information visit skybox.com
About the Product Guide This guide provides a comprehensive overview of Skybox Imagery & Video products. If something is not completely clear or if you need more information, please let us know with an email to
[email protected]. This version of the Product Guide is consistent with products generated by version 0.11.5 of the Skybox Production System software.
Contents 1. Imagery & Video Products ................................................................................................................ 3 2. Image Frames .................................................................................................................................. 4 3. Raw Video........................................................................................................................................ 8 4. Stabilized Video ............................................................................................................................... 12 5. Imaging Geometry ........................................................................................................................... 15 6. Contact Us ....................................................................................................................................... 16
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1. Imagery & Video Products Product
Description
Image Frames
High-resolution imagery with detailed metadata and minimal geometric processing for advanced imagery analytics.
Raw Video
High definition video with minimal geometric processing. Delivered with raw video frames for advanced video analytics.
Stabilized Video
High definition video stabilized to a fixed field of view.
High Fidelity Imagery
High Definition Video
High fidelity imagery when and where you need it. See the cars, trucks, ships, planes, factories, warehouses, and high-value sites that matter to your business and the global economy. For advanced image processing, Skybox imagery includes RPC models, internal sensor geometry, sensor position, and sensor orientation.
At 30 frames per second, Skybox video brings your world to life with incredible clarity, from an entirely new perspective. Raw video is available for advanced video analytics, delivered with comprehensive metadata for every video frame. Map nearshore bathymetry or build 3D models of cities, mines, or mountains.
Specifications | SkySat-1 Imagery
Specifications | Sky-Sat -1 Video
Pan
450-900 nm
Color
Panchromatic
Blue
450-515 nm
Green
515-595 nm
GSD
1.1 m at nadir
Red
605-695 nm
Duration
Up to 90 seconds
Near-IR 740-900 nm
Frame Rate
30 frames per second
Panchromatic GSD
85 cm at nadir
Field of View
2 km X 1.1 km at nadir
Multispectral GSD
2 m at nadir
File Format
H.264 (.mp4)
Bit Depth
11 bits
Swath Width
8 km at nadir
File Format
TIFF
Image Bands
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2. Image Frames High-resolution imagery with detailed metadata for advanced image processing.
Product Description Skybox Image Frames are a set of sub-meter resolution panchromatic, multispectral, and pan-sharpened image frames with detailed metadata required for advanced image processing. The Image Frames product contains minimal geometric processing and is therefore suitable for additional product creation, including orthorectification and mosaicking. A single collection of Skybox Image Frames may consist of tens or hundreds of individual frames covering the extent of the collection area. Individual frames are not north-oriented or referenced to the ground, but include rational polynomial coefficient (RPC) models for georeferencing in commercial off-the-shelf (COTS) software. The Image Frames product also includes a detailed physical sensor model, sensor position, and sensor orientation allowing for rigorous orthorectification by advanced users.
Product Contents The Image Frames product includes the following contents, packaged into a clear and consistent file structure, detailed in the “File Structure & Naming Convention” section below. Deliverable
Description
Panchromatic image frames
A set of panchromatic image frames (16-bit .tif), each with its own RPC.
Multispectral image frames
A set of multispectral image frames (16-bit .tif), each with its own RPC.
Pan-sharpened BGRN image frames
A set of pan-sharpened BGRN image frames (16-bit .tif), each with its own RPC.
Pan-sharpened RGB image frames
A set of pan-sharpened RGB image frames (8-bit .tif), each with its own RPC.
Pan-sharpened NRG image frames
A set of pan-sharpened NRG image frames (8-bit .tif), each with its own RPC.
Thumbnail image
Coarse resolution RGB thumbnail (.png) for quick display.
Thumbnail KML
Coarse resolution RGB thumbnail for display in Google Earth.
JSON Metadata File
Image metadata file.
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Naming Convention The Image Frames product adheres to a consistent naming convention across all of the product contents. Filenames include several descriptive elements that are useful for organizing, sorting, and referencing specific files within and between products. The descriptive elements become increasingly granular from left to right.
satelliteID_yyyymmddThhmmssZ_product_detector(D_frameID Term
Definition
satelliteID
Satellite-specific identifier (e.g. SkySat-1 = s01)
yymmddThhmmssZ
Date and time (UTC) at the start of image collection. Format follows ISO 8601.
product
Specific product type within the Image Frames data set (e.g. panchromatic, multispectral, pan-sharpened RGB)
detectorID
Numeric ID of the detector for a given image frame (e.g. d1, d2, or d3)
frameID
Numeric ID of each image frame, consistent across pan, ms, and pansharpened data
Filename Example: s01_20140228T193724Z_pan_d2_0003.tif
SkySat-‐1, 28 Feb 2014, 19:37:24 UTC, panchromatic, detector 2, frame 0003
File Structure The Image Frames product may include tens or hundreds of individual image frames, covering the specified area of interest for all of the product types (panchromatic, multispectral, and pan-sharpened). These frames are organized in a series of sub-folders within the root product directory. satID_yyyymmddThhmmssZ/ s01_20140228T193724Z_metadata.txt s01_20140228T193724Z_thumbnail.kml s01_20140228T193724Z_thumbnail.png
Metadata file in structured JSON file format with comprehensive metadata for advanced image exploitation Coarse resolution RGB thumbnail for display in Google Earth Coarse resolution RGB thumbnail for quick visual display
panchromatic/ s01_20140228T193724Z_pan_d1_0001.tif s01_20140228T193724Z_pan_d1_0001_rpc.txt s01_20140228T193724Z_pan_d2_0001.tif s01_20140228T193724Z_pan_d2_0001_rpc.txt s01_20140228T193724Z_pan_d3_0001.tif Imagery & Video Product Guide | 11 April 2014
Panchromatic image frame (detector 1, frame 0001) RPC model file (detector 1, frame 0001) Panchromatic image frame (detector 2, frame 0001) RPC model file (detector 2, frame 0001) Panchromatic image frame (detector 3, frame 0001)
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s01_20140228T193724Z_pan_d3_0001_rpc.txt s01_20140228T193724Z_pan_d1_0002.tif s01_20140228T193724Z_pan_d1_0002_rpc.txt … Panchromatic image frames … s01_20140228T193724Z_pan_d3_0012.tif
RPC model file (detector 3, frame 0001) Panchromatic image frame (detector 1, frame 0002) RPC model file (detector 1, frame 0002)
s01_20140228T193724Z_pan_d3_0012_rpc.txt
RPC model file (detector 3, frame 0012)
satelliteID_dateTtimeZ_pan_detectorID_frameID.tif Panchromatic image frame (detector 3, frame 0012)
multispectral/ s01_20140228T193724Z_ms_d1_0001.tif s01_20140228T193724Z_ms_d1_0001_rpc.txt … Multispectral image frames … s01_20140228T193724Z_ms_d3_0012.tif s01_20140228T193724Z_ms_d3_0012_rpc.txt
Multispectral image frame (detector 1, frame 0001) RPC model file (detector 1, frame 0001) satelliteID_dateTtimeZ_ms_detectorID_frameID.tif Multispectral image frame (detector 3, frame 0012) RPC model file (detector 3, frame 0012)
pansharp/ s01_20140228T193724Z_pansharp_rgb_d1_0001.tif Pan-sharpened image frame (detector 1, frame 0001) s01_20140228T193724Z_pansharp_rgb_d1_0001_rpc.txt RPC model file (detector 1, frame 0001) … Pan-sharpened RGB image frames satelliteID_dateTtimeZ_pansharp_rgb_detectorID_frameID.tif … s01_20140228T193724Z_pansharp_rgb_d3_0012.tif Pan-sharpened image frame (detector 3, frame 0012) s01_20140228T193724Z_pansharp_rgb_d3_0012_rpc.txt RPC model file (detector 3, frame 0012)
Metadata Conventions The Image Frames product is delivered with a metadata file (_metadata.txt) containing comprehensive collection and sensor metadata in a structured JSON format. This information enables advanced users to perform rigorous orthorectification or write scripts to extract metadata required for advanced image exploitation. Specifically, the metadata file includes collection-specific metadata, rigorous sensor models, exterior orientation parameters, and a list of the product contents. The following provides a high-level overview of the JSON metadata file structure. { “metadata”: { } “sensor”: { } “panchromatic”: { } “multispectral”: { } “pansharp-bgrn”: { } “pansharp-nrg”: { } “pansharp-rgb”: {
Collection-specific metadata parameters Rigorous sensor model information for each sensor used in the imagery collection Filename, RPC model, and exterior orientation for each panchromatic frame Filename, RPC model, and exterior orientation for each multispectral frame
Filename, RPC model, and exterior orientation for each pan-sharpened frame in the 4-band BGRN product Filename, RPC model, and exterior orientation for each pan-sharpened frame in the 3-band NIR (color-infrared) product Filename, RPC model and exterior orientation for each pan-sharpened frame in the 3-band RGB (natural color) product
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The following table defines the parameters contained within the JSON metadata file:
metadata
sensor
Name
Type
Description
copyright catalogID collectionStartTime collectionEndTime satelliteID satelliteName collectionType
string string string string string string string
Copyright information Unique catalog ID corresponding to a single collection event
productionSystemVersion
string
satelliteElevationAngleMin satelliteElevationAngleMean satelliteElevationAngleMax satelliteAzimuthAngleMin satelliteAzimuthAngleMean satelliteAzimuthAngleMax upperLeftLatitude upperLeftLongitude lowerRightLatitude lowerRightLongitude solarElevationAngle solarAzimuthAngle
double double double double double double double double double double double double
panchromaticGSDMean
double
panchromaticGSDUnits multispectralGSDMean multispectralGSDUnits rpcModel
string double string boolean
rigorousModel
boolean
rpcHorizontalCoordinateSystem rpcVerticalCoordinateSystem
string string
satelliteID satelliteName
string string
sensorCount
uint16
linearUnits angularUnits sensorID sensorModelID sensorName sensorModelDefinitionDate sensorType focalLength pixelSizeX pixelSizeY rows columns centerX centerY
string string uint16 uint16 string string string double double double uint16 uint16 uint16 uint16
mechanicalDepartureParameters
double[6]
radialDistortionParameters tangentialDistortionParameters
double[6] double[9]
folder frameCount frameIndex frames
exteriorOrientationParameters sensorID sensorModelID frameName rpcName
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string uint16 uint16 double[6] uint16 uint16 string string
Collection start time “YYYY-MM-DDTHH:MM:SSZ” Collection end time “YYYY-MM-DDTHH:MM:SSZ” Unique ID assigned to the spacecraft Unique name identifying the spacecraft Strip, Point, Area, Path Software version of the production system used to generate the product Minimum satellite elevation angle over the collection (degrees) Mean satellite elevation angle over the collection (degrees) Maximum satellite elevation angle over the collection (degrees) Minimum satellite azimuth angle over the collection (degrees) Mean satellite azimuth angle over the collection (degrees) Maximum satellite azimuth angle over the collection (degrees) Latitude of the upper left corner of the collection extent Longitude of the upper left corner of the collection extent Latitude of the lower right corner of the collection extent Longitude of the lower right corner of the collection extent Solar elevation angle at the time of collection Solar azimuth angle at the time of collection Mean GSD of the panchromatic imagery, with RPC georegistration Units of the reported panchromatic GSD (meters) Mean GSD of the multispectral imagery, with RPC georegistration Units of the reported multispectral GSD (meters) True or false, indicating that the product contains an RPC model True or false, indicating that the product contains a rigorous sensor model Horizontal coordinate system for geographic processing via RPC Vertical coordinate system for geographic processing via RPC Unique ID assigned to the spacecraft Unique name identifying the spacecraft Number of sensor models included in the sensor model section, nominally 15 Linear units of subsequent sensor model parameters Radial units of subsequent sensor model parameters Unique identifier of each physical detector Unique identifier of the parameters for each sensor model Unique identifier of the parameters for each sensor model UTC date (YYYY-MM-DD) when the sensor model was defined Sensor type, panchromatic (PAN) or multispectral (MS) Focal length of the system (m) Physical size of each pixel in the X direction (m) Physical size of each pixel in the Y direction (m) Number of pixels in the Y-axis (vertical) Number of pixels in the X-axis (horizontal) X-coordinate of the center pixel Y-coordinate of the center pixel Parameters defining the mechanical departures from the nominal detector frame Parameters of the radial distortion polynomial Parameters of the tangential distortion polynomial Directory containing the image frames for a given image product Number of image frames for a given image product Index identifying a specific frame within a given image product Parameters defining spacecraft position and attitude for a given frame, X, Y, Z, omega, phi, kappa Unique identifier of the physical detector for a given frame Unique identifier of the sensor model for a given frame Unique filename for a given frame Unique filename for the RPC model for a given frame
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3. Raw Video High definition video with raw video frames and detailed metadata for advanced video processing.
Product Description Raw Video is high-definition (HD), full motion video (FMV) of a fixed ground target.
Raw Video is
panchromatic (black & white) with a full frame rate of 30 frames per second. The Raw Video product is delivered with a complete set of individual image frames and associated metadata for advanced video processing and additional product creation by advanced users.
Product Contents The Raw Video product includes the following contents, packaged into a clear and consistent file structure, detailed in the “File Structure” section below. Deliverable
Description
Raw video
Raw video file (.mp4), 1920 X 1080 pixels (1080p HD)
Raw video frames
Raw panchromatic video frames (16-bit .tif), each with its own RPC
Thumbnail image
Coarse resolution thumbnail image (.png) to serve as a poster frame, taken from the frame halfway through the video
Thumbnail video
Coarse resolution thumbnail video file (.mp4) for email or web, 480 x 270 pixels
JSON metadata file
Video metadata file
Naming Convention The Raw Video product adheres to a consistent naming convention across all of the product contents. Filenames include several descriptive elements that are useful for organizing, sorting, and referencing specific files within and between products. The descriptive elements become increasingly granular from left to right. Video (.mp4) filenames include a time stamp that indicates the start time of the video. Raw video frame (.tif) filenames include a more specific timestamp corresponding to the acquisition time of each individual frame, with one hundredth of a second precision.
satelliteID_yyyymmddThhmmssZ Term satelliteID
yymmddThhmmssZ
Definition Satellite-specific identifier (e.g. SkySat-1 = s01) Date and time (UTC) at the start of video collection. Format follows ISO 8601. Raw video frames have time precision to 1/100th of a second and represent the exact time that specific frame was collected.
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Filename Example – Raw Video (.mp4): s01_20140228T102512Z.mp4
. SkySat-‐1, 28 Feb 2014, 10:25:12 UTC . Filename Example – Raw Video Frame (.tif): s01_20140228T10251483Z.mp4
. SkySat-‐1, 28 Feb 2014, 10:25:14.83 UTC .
File Structure The Raw Video product includes both a raw video file and a collection of raw video frames for advanced video analysis. The raw video is included in the root directory, while the raw video frames are organized in a sub-folder called video_frames. satID_yyyymmddThhmmssZ/ s01_20140228T102512Z.mp4 s01_20140228T102512Z_metadata.txt s01_20140228T102512Z_thumbnail.mp4 s01_20140228T102512Z_thumbnail.png
Raw video file (H.264 .mp4) Metadata file in structured JSON file format with comprehensive metadata for advanced video exploitation Coarse resolution thumbnail video for email or web Coarse resolution thumbnail image for quick visual display
video_frames/ s01_20140228T10251267Z.tif s01_20140228T10251267Z_rpc.txt s01_20140228T10251270Z.tif s01_20140228T10251270Z_rpc.txt s01_20140228T10251274Z.tif s01_20140228T10251274Z_rpc.txt … Raw video frames … s01_20140228T10254267Z.tif s01_20140228T10254267Z_rpc.txt
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Raw video frame (time 10:25:12.67 UTC) RPC model file (time 10:25:12.67 UTC) Raw video frame (time 10:25:12.70 UTC) RPC model file (time 10:25:12.70 UTC) Raw video frame (time 10:25:12.74 UTC) RPC model file (time 10:25:12.74 UTC) satelliteID_dateTtimeZ.tif Raw video frame (time 10:25:42.67 UTC) RPC model file (time 10:25:42.67 UTC)
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Metadata Conventions The Raw Video product is delivered with a metadata file (_metadata.txt) containing comprehensive collection and sensor metadata in a structured JSON format. This information enables advanced users to perform advanced video analysis or write scripts to extract metadata for automated video processing. Specifically, the metadata file includes collection-specific metadata, rigorous sensor models, exterior orientation parameters, and a list of the product contents. The following is a high-level overview of the JSON metadata file structure. { “metadata”: { } “sensor”: { } “video_frames”: { }
Collection-specific metadata parameters Rigorous sensor model information for the sensor used in the video collection Filename, rpc model, and exterior orientation for each raw video frame
}
The following table defines the parameters contained within the JSON metadata file.
metadata
Name
Type
Description
copyright
string
catalogID
String
collectionStartTime collectionEndTime satelliteID satelliteName collectionType
string string string string string
Copyright information Unique catalog ID corresponding to a single collection event Collection start time “YYYY-MM-DDTHH:MM:SSZ”
productionSystemVersion
string
videoLength frameRate
uint16 double
satelliteElevationAngleMin
double
satelliteElevationAngleMean
double
satelliteElevationAngleMax
double
satelliteAzimuthAngleMin
double
satelliteAzimuthAngleMean
double
satelliteAzimuthAngleMax
double
upperLeftLatitude upperLeftLongitude lowerRightLatitude lowerRightLongitude solarElevationAngle solarAzimuthAngle
double double double double double double
panchromaticGSDMean
double
panchromaticGSDUnits
string
rpcModel
boolean
rigorousModel
boolean
rpcHorizontalCoordinateSystem
string
rpcVerticalCoordinateSystem
string
Imagery & Video Product Guide | 29 April 2014
Collection end time “YYYY-MM-DDTHH:MM:SSZ” Unique ID assigned to the spacecraft Unique name identifying the spacecraft Video Software version of the production system used to generate the product Video length (duration) in seconds Frame rate of the video collection in frames per second Minimum satellite elevation angle over the collection (degrees) Mean satellite elevation angle over the collection (degrees) Maximum satellite elevation angle over the collection (degrees) Minimum satellite azimuth angle over the collection (degrees) Mean satellite azimuth angle over the collection (degrees) Maximum satellite azimuth angle over the collection (degrees) Latitude of the upper left corner of the collection extent Longitude of the upper left corner of the collection extent Latitude of the lower right corner of the collection extent Longitude of the lower right corner of the collection extent Solar elevation angle at the start time of collection Solar azimuth angle at the start time of collection Mean GSD of the panchromatic raw video frames, with RPC georegistration Units of the reported panchromatic GSD (meters) True or false, indicating that the product contains an RPC model True or false, indicating that the product contains a rigorous sensor model Horizontal coordinate system for geographic processing via RPC Vertical coordinate system for geographic processing via RPC
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sensor
video_frames
satelliteID satelliteName
string string
sensorCount
uint16
linearUnits angularUnits sensorID sensorModelID sensorName
string string uint16 uint16 string
sensorModelDefinitionDate
string
sensorType focalLength pixelSizeX pixelSizeY rows columns centerX centerY
string double double double uint16 uint16 uint16 uint16
mechanicalDepartureParameters
double[6]
radialDistortionParameters tangentialDistortionParameters
double[6] double[9]
folder
string
frameCount
uint16
frameIndex
uint16
exteriorOrientationParameters sensorID sensorModelID frameName rpcName
Imagery & Video Product Guide | 11 April 2014
double[6] uint16 uint16 string string
Unique ID assigned to the spacecraft Unique name identifying the spacecraft Number of sensor models included in the sensor model section, nominally 1 Linear units of subsequent sensor model parameters Radial units of subsequent sensor model parameters Unique identifier of each physical detector Unique identifier of the parameters for each sensor model Unique identifier of the parameters for each sensor model UTC date (YYYY-MM-DD) when the sensor model was defined Sensor type, panchromatic (PAN) or multispectral (MS) Focal length of the system (m) Physical size of each pixel in the X direction (m) Physical size of each pixel in the Y direction (m) Number of pixels in the Y-axis (vertical) Number of pixels in the X-axis (horizontal) X-coordinate of the center pixel Y-coordinate of the center pixel Parameters defining the mechanical departures from the nominal detector frame Parameters of the radial distortion polynomial Parameters of the tangential distortion polynomial Directory containing the image frames for a given image product Number of image frames for a given image product Index identifying a specific frame within a given image product Parameters defining spacecraft position and attitude for a given frame, X, Y, Z, omega, phi, kappa Unique identifier of the physical detector for a given frame Unique identifier of the sensor model for a given frame Unique filename for a given frame Unique filename for the RPC model for a given frame
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4. Stabilized Video High definition video stabilized to a fixed field of view.
Product Description Stabilized Video is high-definition (HD), full motion video (FMV) of a fixed ground target, stabilized to a fixed field of view. Stabilized Video is panchromatic (black & white) with a full frame rate of 30 frames per second. The Stabilized Video product is not delivered with a complete set of individual image frames and associated metadata for advanced video processing and additional product creation by advanced users.
Product Contents The Stabilized Video product includes the following contents, packaged into a clear and consistent file structure, detailed in the “File Structure” section below. Deliverable
Description
Stabilized video
Stabilized video file (.mp4), 1920 X 1080 pixels (1080p HD)
Thumbnail image
Coarse resolution thumbnail image (.png) to serve as a poster frame, taken from the frame halfway through the video
Thumbnail video
Coarse resolution thumbnail video (.mp4) for email or web, 480 x 270 pixels
JSON metadata file
Video metadata file
Naming Convention The Stabilized Video product adheres to a consistent naming convention across all of the product contents. Filenames include several descriptive elements that are useful for organizing, sorting, and referencing specific files within and between products. The descriptive elements become increasingly granular from left to right. Video (.mp4) filenames include a time stamp that indicates the start time of the video.
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satelliteID_yyyymmddThhmmssZ
Term satelliteID yymmddThhmmssZ
Definition Satellite-specific identifier (e.g. SkySat-1 = s01) Date and time (UTC) at the start of video collection. Format follows ISO 8601.
Filename Example – Stabilized Video (.mp4): s01_20140228T102512Z.mp4
. SkySat-‐1, 28 Feb 2014, 10:25:12 UTC .
File Structure The Stabilized Video product includes both a stabilized video file with a fixed frame of reference. The stabilized video and all corresponding metadata is contained within the root directory. satID_yyyymmddThhmmssZ/ s01_20140228T102512Z.mp4 s01_20140228T102512Z_metadata.txt s01_20140228T102512Z_thumbnail.mp4 s01_20140228T102512Z_thumbnail.png
Stabilized video file (H.264 .mp4) Metadata file in structured JSON file format with comprehensive metadata for advanced video exploitation Coarse resolution thumbnail video for email or web Coarse resolution thumbnail image for quick visual display
Metadata Conventions The Stabilized Video product is delivered with a metadata file (_metadata.txt) containing metadata specific to the video collection. The following is a high-level overview of the JSON metadata file structure: { “metadata”: { }
Collection-specific metadata parameters
}
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The following table defines the parameters contained within the JSON metadata file:
metadata
Name
Type
Description
copyright
string
catalogID
string
collectionStartTime collectionEndTime satelliteID satelliteName collectionType
string string string string string
Copyright information Unique catalog ID corresponding to a single collection event Collection start time “YYYY-MM-DDTHH:MM:SSZ”
productionSystemVersion
string
videoLength frameRate
double uint16
satelliteElevationAngleMin
double
satelliteElevationAngleMean
double
satelliteElevationAngleMax
double
satelliteAzimuthAngleMin
double
satelliteAzimuthAngleMean
double
satelliteAzimuthAngleMax
double
upperLeftLatitude upperLeftLongitude lowerRightLatitude lowerRightLongitude solarElevationAngle solarAzimuthAngle
double double double double double double
panchromaticGSDMean
double
panchromaticGSDUnits
string
rpcModel
boolean
rigorousModel
boolean
rpcHorizontalCoordinateSystem
string
rpcVerticalCoordinateSystem
string
Imagery & Video Product Guide | 29 April 2014
Collection end time “YYYY-MM-DDTHH:MM:SSZ” Unique ID assigned to the spacecraft Unique name identifying the spacecraft Video Software version of the production system used to generate the product Video length (duration) in seconds Frame rate of the video collection in frames per second Minimum satellite elevation angle over the collection (degrees) Mean satellite elevation angle over the collection (degrees) Maximum satellite elevation angle over the collection (degrees) Minimum satellite azimuth angle over the collection (degrees) Mean satellite azimuth angle over the collection (degrees) Maximum satellite azimuth angle over the collection (degrees) Latitude of the upper left corner of the collection extent Longitude of the upper left corner of the collection extent Latitude of the lower right corner of the collection extent Longitude of the lower right corner of the collection extent Solar elevation angle at the start time of collection Solar azimuth angle at the start time of collection Mean GSD of the panchromatic raw video frames, with RPC georegistration Units of the reported panchromatic GSD (meters) True or false, indicating that the product contains an RPC model True or false, indicating that the product contains a rigorous sensor model Horizontal coordinate system for geographic processing via RPC Vertical coordinate system for geographic processing via RPC
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5. Imaging Geometry To fully exploit the detailed geometric metadata included with Skybox Imagery & Video products, it is helpful to understand several fundamental concepts of the Skybox imaging system. Starting with the satellite, the unique sensor configuration of SkySat-1 allows for flexibility in both data collection and product creation. Three high-performance framing sensors capture data at frame rates as high as 50 frames per second, enabling two distinct collection modes: imagery & video. For imagery collections, SkySat-1 sensors capture multiple images of every point on the ground, allowing Skybox’s sophisticated ground processing
SkySat&1’s*Array*of*3*Framing*Sensors
algorithms to integrate many oversampled frames for improved resolution and outstanding image quality. For video collections, the spacecraft can be maneuvered to stare a single detector at a target on the ground, collecting data at 30 frames per second. On the ground, these frames are integrated into high-definition, full motion video. Raw video products are also delivered with raw video frames from this single detector. Every image frame in the Image Frames p roduct and every raw video frame in the Raw Video product are delivered with their own corresponding RPC model for straightforward geometric production in most common image processing and exploitation software. For users familiar with advanced photogrammetry, the metadata files for both of these products also include a rigorous sensor model, sensor position, and sensor attitude for every individual frame. For detailed documentation of SkySat-1’s imaging geometry and sensor model design, please refer to the document, SkySat-1 Imaging Geometry.
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6. Contact Us Please contact us at
[email protected] if you have any questions or would like additional information about Skybox products. Also, note that this document will evolve over time, with additional information, clearer explanations, and new Skybox products! Please continue to check that you have the latest version by visiting:
https://skyboximaging.box.com/ProductGuide Skybox Imaging, Inc. 1061 Terra Bella Ave. Mountain View, California 94043 United States of America www.skybox.com
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