David Hemphill
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Articles
Recent activity by David Hemphill-
Areas of Interest Quantity Limits
The number of AOIs that may be created are limited based on contract terms. There are two AOI limits to be aware of: Active or Paused AOIsA contract-specified number of AOIs may be active (or paus...
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Area of Interest Size and Shape Limits
The Analytic system restricts the size of an AOI based on the bounding box of the polygon(s) defining the AOI boundary. The following examples show both the AOI boundary and the bounding box. The b...
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Sentinel-1 Polarization
SAR is an active collection system that emits a radar signal and measures what bounces back. Different combinations of vertical and horizontal wave polarizations are used to measure and detect diff...
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API: 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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API: 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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Creating an Area of Interest
Analytics applies algorithms to an Area of Interest (AOI). The AOI is central to analytics as it defines the geographic boundary of interest. AOIs may be created by directly drawing the boundary on...
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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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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....