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David Hemphill

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Articles

Recent activity by David Hemphill
  • Sentinel-1 Limitations

    Sentinel-1 change analytics are limited to where Sentinel-1 data is available. While is is possible to create Areas of Interest over any location on the globe using Capella Analytics, the actual an...

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  • Downloading Analytic products using the API

    Analytic products are available as GeoTIFF images. There are a number of image "assets" produced each time the analytic algorithms run. Each product contains the following assets. Note: the term "a...

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  • Invitation and Logging In

    An invitation to the Capella Console is delivered in an email from a "no-reply" alias with the subject Capella Space Temporary Login. If it is not in your inbox, please check your spam folder. Cop...

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  • Open API Docs for Analytics

    OpenAPI Documents are located here. Authentication and Entitlement access is located here.

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  • Specifying a Version for the Analytics API

    The Analytics API supports versioning to allow time to adjust for upgrades that might break existing implementations.  Capella maintains two API versions: Current (most recent) Previous Version n...

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  • Active, Paused, and Archived AOIs

    AOI's are managed using different states: Active Paused Archived Active and Paused Active AOIs continuously generate new Sentinel-1 based change results as data becomes available. To prevent AOIs...

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  • Sentinel-1 Change Detection Results

    Capella's Sentinel-1 based Change Monitoring uses a pixel-based change detection method to identify change over time. The result is referred to as a Change Map. Using multiple Sentinel-1 SAR image ...

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  • Polarities and Synthetic Aperture Radar (SAR)

    SAR is an active collection system that emits a radar signal and measures what bounces back. Different combinations of vertical and horizontal wave polarities are used to measure and detect differe...

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  • Sentinel-1 based Continuous Change Monitoring

    Continuous Change Monitoring automatically generates new change results for an active Area of Interest (AOI) as data becomes available. For Sentinel-1 based change detection results, a new set of c...

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  • Using the Timeline

    Analytic results are displayed on the AOI Details page with the most recent results selected by default. The following screenshot shows how instances of the analytic results appear on the timeline....

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