Kanopus: turn a land image into a timely, qualified map

Kanopus-V is a Russian land-observation satellite family. WMO identifies visible and near-infrared multispectral measurements alongside panchromatic — open definition imaging, with differences in instrument complements across individual spacecraft. The Kanopus-V-IK variant also appears separately in its instrument listings. Checking the actual payload avoids assigning a specialized instrument to every member simply because their names begin alike. A family history should preserve both shared purpose and meaningful differences.

These measurements can support vegetation and land-cover studies. Reflected-light imagery depends on illumination and can be obstructed by clouds. A polar or Sun-synchronous orbit offers repeated passes rather than continuous observation of one location. Observing opportunities, usable clear-sky coverage and the delivery of a processed map are therefore separate parts of a service. A planned revisit cannot guarantee a cloud-free picture at the instant a user wants one.

Imagine an original assessment divided into one hundred equal-area cells. Clouds hide thirty. Among the seventy visible cells, fourteen are classified as recently burned. Fourteen divided by seventy gives twenty percent of the visible area. Fourteen divided by one hundred gives fourteen percent of the complete grid that is observed and classified as burned. Neither calculation establishes the burn fraction of the thirty obscured cells. Mark those cells unknown instead of silently calling them unburned.

A classifier also has errors. A dark region might be water, shadow or a burn scar, and a map needs suitable reference observations to evaluate those alternatives. Reporting an observed fraction with an explicit cloud mask is more useful than presenting a complete-looking colored map that conceals missing evidence. The denominator answers a specific question; changing it changes the meaning even when the fourteen marked cells remain the same.

State what the denominator means

A map acquired in the morning but delivered late that evening describes the morning observation. Processing completion does not move the acquisition time forward. For a rapidly changing event, users need both timestamps, the area actually observed and the classification’s limitations. In a second invented example, an observation at 08:00 reaches the analyst at 11:00: its acquisition-to-delivery delay is three hours, even if the download itself took only a few minutes.

Compare Kanopus with Resurs-P by asking which instrument, coverage, timing and product fit the question. A detailed narrow image may be valuable for one task while a different observation schedule fits another. Neither a family name nor a single resolution number establishes overall usefulness. Kanopus teaches a practical habit: preserve what the satellite measured, distinguish what remains unknown, and carry that information through to the map someone actually uses.