Overview

Summary

This repository contains GRASS GIS Addons, bash scripts, and a detailed step-by-step documentation of a GRASS GIS based georectification process of satellite images from the KEYHOLE reconnaissance missions KH-4A/B (CORONA), KH-7 (GAMBIT), and KH-9 (HEXAGON). Further background can be found here.

Repo Content

• documentation: contains a detailed step-by-step guide to rectify KEYHOLE reconnaissance missions based on GRASS GIS. See documentation/README.md to get started.
• grass_addons: contains two addons for GRASS GIS that are required for the rectification process
• scripts: contains shell scripts that are required for the rectification process

KEYHOLE missions overview:

KH-4A, KH-4B - CORONA

• Panorama camera
  • -> orthorectification with panorama correction
• Film size: 70 mm x 756.9 mm
• flight direction seems to be south
• in the scanned film, north is approximately up

KH-7 - GAMBIT

• strip camera, acquired imagery in continuous lengthwise sweeps of the terrain.
  • -> orthorectification does not really work, bad geolocation
  • -> panorama correction not applicable
  • -> standard rectification
• Film size: 9 inch (228.6 mm) x variable length
• flight direction seems to be south
• in the scanned film, north is approximately right

KH-9 - HEXAGON

• Panorama camera -> orthorectification with panorama correction
• flight direction seems to be south
• in the scanned film, north is approximately up
• focal_length: 152.4 cm

Further KEYHOLE missions

• KH-6 Lanyard: Lanyard was a failed mission - no data with acceptable quality available
• KH-5 Argon: ground resolution too low - irrelevant
• KH-8 Gambit 3: no data available