David Hemphill
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Articles
Recent activity by David Hemphill-
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....
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Change Score
Change analytic results may be adjusted to increase or suppress the sensitivity of change displayed. Each pixel in a change map is assigned a value between 0 and 1 which represents the score determ...
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Viewing Analytic Results
Analytic results are displayed on the AOI Details page. The Layers control (see screenshot below), is located at the top-right of the AOI details page. This control allows for modifying which laye...
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Supported Browsers
Capella Analytics is best experienced using Google Chrome. . Firefox and Microsoft Edge are supported, but you may experience minor page layout issues.