Terrafirma offers two types of product
- Historical and Monitoring - which vary in their degree
of GIS integration according to a 'Level' (see below).
Historical products use integrations
of ERS-1/2 (1991-current) and ENVISAT (2002-current) radar
data already acquired and residing in archive to make
products that are as up to date as the last acquisition
made.
Monitoring products, however, imply
specific satellite tasking (or ordering) of future (or
subsequent) 'visible' acquisition(s).
Historical Terrafirma product are
offered in three Levels of sophistication:
Level 1 products comprise the digital
output of the PSI processing. Levels 2 and 3 products
comprise this output, plus other derived maps and reports
synthesised from an array of different data and information
types.
Landslide applications introduce two
variants based on Level 2 and Level 3 products respectively:
A Landslide Inventory product (LSI) which maps unstable
slopes over whole basins incorporating SAR data from the
archive, and a consequent Landslide Monitoring product
(LSM) which focuses on the ongoing InSAR monitoring of
specific slopes, incorporating data from new programmed
acquisitions. LSI products are made from H1 products.
LSM products are made from both LSI and M1 products. Both
Landslide products utilise auxiliary data including geological,
in situ and Very High Resolution optical imagery.
In summary:
| Product |
Level |
Description |
| H-1 |
Level 1 |
Historical product (‘raw’
InSAR motion measurements) |
| H-2 |
Level 2 |
Causal product (initial interpretation
of H-1) |
| H-3 |
Level 3 |
Modelled product (modelled
H-1/H-2 product) |
| M-1 |
Level 1 |
Monitoring product (updated
H-1 product) |
| LSI |
N/A |
Landslide Inventory Product
(Interpreted basin-wide InSAR motion measurements,
integrated into existing landslide inventory) |
| LSM |
N/A |
Landslide Monitoring Product
(monitoring of specific landslide event) |
