David Hemphill
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Articles
Recent activity by David Hemphill-
Area of Interest Geographic Limits
Global Change Monitoring is limited to where Sentinel-1 data is available. While is is possible to create Areas of Interest over any location on the globe using the Capella Analytics App, the deliv...
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Object Detection Metrics Overview
Term Description Example Precision Precision is a measure of usefulness as it measure the rate of true positives (objects detected are actually vessels) If one out of every 4 vessels de...
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Vessel Relative Sizing
Vessel Detection categorizes each vessel detection into a size range for relative comparison when counting or filtering. The following table defines the ranges for each size label. The size label d...
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API: Open API Docs for Analytics
OpenAPI Documents are located here. Authentication and Entitlement access is located here.
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OpenStreetMap (OSM) Water Layer Rasterized GeoTiff Map
Usage: Capella Space uses OpenStreetMap (OSM) Water Layer to create land masks for filtering Vessel Detections over land masses. Attribution: Capella Space Land & Water Masks are a modified versio...
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Searching and Viewing Vessel Detection Products using the Capella Console
Vessel detection analytic products are available through the Capella Console search. Vessel detection products may be viewed in console along with the source imagery. The following screen shot sho...
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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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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...