The timeframe for completing a tasking order is determined by a feasibility study. Some parameter values can lead to a longer acquisition time, while others can help speed up the process and lead to an order being completed earlier than expected.
If the width of an area of interest (AOI) is greater than the swath width of the chosen collection, the sensor will need to do multiple passes over the area. The more passes the sensor has to do, the longer it takes to complete the order.
Shape and complexity
A standard bounding box is considered a simple-shaped AOI, while a long corridor with many vertices is considered a complex shape. More complex polygons may take longer to capture. If the AOI is non-rectangular, it may take multiple rectangular assets to cover the shape, increasing the amount of time needed.
The orientation of the AOI compared to the sensor’s orbit can affect the timeframe of an order acquisition. Most sensors are sun-synchronous, so a North-South oriented polygon will be covered by the swath of the satellite orbit, and will be captured faster than an East-West oriented polygon.
A sensor can quickly capture an AOI close to the poles because there is a lot of overlap in this region. Meanwhile, an AOI close to the equator will require more attempts.
Whether a sensor can successfully capture an AOI in any given pass depends largely on the climate in the geographic area of the AOI at a certain time of interest. If there are a lot of clouds, the sensor will need to do another pass.
Cloud coverage is the percentage of clouds covering an AOI or a full scene, depending on how the data is delivered in a chosen collection. The optimal cloud coverage is 10%. For cloudy climates, it can be up to 30%. If the chosen cloud coverage is less than the optimal value, the sensor will need more passes to capture imagery with the required parameters.
The smaller the incidence angle is, the more difficult it is to task a sensor. For example, a 30° incidence angle will require fewer attempts than a 20° incidence angle.
The mono acquisition mode is the easiest one to capture. Stereo and tri-stereo modes require a sensor to turn on the fly. Considering the complexity of the operation, the attempt might not be successful, and the sensor will need to do another pass. For more information, see Acquisition modes.