Description

The current equation we’re using to model the payload’s ground sample distance (aka sensor-limited spatial resolution, sampling-limited spatial resolution) is suspicious, as was pointed out by @Amreen Imrit in this slack thread:

Slack

This metric was one of the first things we modelled at the start of the mission, back before we had a system in place to peer-review our models. For such an incredibly important metric, its important we are sure that we are modelling it correctly.

Tasks

• [x] Search for the derivation of the equation for ground sample distance. Key terms to look for are {pushbroom, satellite, spatial resolution, ground sample distance, derivation, equation}
  • [ ] If one does not exist, derive one and compare against external sources
  • [ ] May consider reaching out to our advisors (i.e. ‣ ).
• [x] Rewrite the existing Sensor-Limited Spatial Resolution equation card with the correct model.
• [x] Modify the relevant classes in Architect to match the correct equation.

Notes

2022/11/02

@David

• Pulled up multiple sources on GSD and added them to the equation card.
• None appears to show a step-by-step derivation of the equation, and there’s discrepancies across the sources
• We have no idea how they’re getting to the equations they’re presenting in their final form

2022/11/08

Notes from sources on Sensor-Limited Spatial Resolution

• GSD: distance between pixel centers measured on the ground, limitation to spatial resolution

Original derivation:

https://docs.google.com/document/d/1udBRNolk9W6K1h8xK-E37FPnOPB7h7YhCqXJHxcTYWQ/edit#

Non-nadir view: