AirMinEx

STS AMSS SPECIFICATIONS

Spectral Regions and Spectral Bands

The AMSS acquires 32 narrow spectral bands distributed across 3 important spectral regions:-

The visible to near infra-red (VNIR).
For the AMSS this region is between 0.4 and 1.05 mm
The short wave infra-red (SWIR).
The SWIR for the AMSS covers 2.0 to 2.5 mm
The thermal infra-red (TIR).
The TIR for the AMSS is between 8.0 and 12.0 mm

The band centres and band passes of the 32 channels are:-

Spectral Region	AMSS Band	Band Centre (microns)	Band Pass (nanometres)
	1	0.413	17
	2	0.450	17
	3	0.488	17
	4	0.525	17
	5	0.563	17
	6	0.600	17
	7	0.638	17
VNIR	8	0.675	17
	9	0.713	17
	10	0.750	17
	11	0.788	17
	12	0.825	17
	13	0.863	17
	14	0.900	17
	15	0.937	17
	16	0.975	17
	17	2.117	42
	18	2.161	42
	19	2.205	42
SWIR	20	2.249	42
	21	2.293	42
	22	2.337	42
	23	2.381	42
	24	2.425	42
	25	8.11	500
	26	8.64	500
	27	9.17	500
TIR	28	9.70	500
	29	10.22	500
	30	10.75	500
	31	11.28	500
	32	11.81	500

The data for each of the channels are recorded simultaneously, with all channels sharing a common, resolution defining aperture stop. This ensures precise band to band registration.

The data for all channels are digitised to 16bit.

Spatial Resolution and Swath

The spatial resolution and the swath width of the AMSS are determined from the sensor’s instantaneous field of view (IFOV = 2.1mRad) and field of view (FOV = 90o) respectively, and the height above ground level (HAGL) of the aircraft.

The HAGL to achieve a specific ground resolution and the corresponding swath width are summarised in the following table:-

Ground Resolution (pixel size, metres)	HAGL (Metres)	HAGL (Feet)	Swath Width (Km)
2	950	3120	1.9
4	1900	6250	3.8
6	2860	9380	5.7
8	3810	12500	7.62
10	4760	15620	9.52

Note: The ground resolution and swath widths in the table are calculated for near level ground using the average HAGL for the survey area. Actual pixel sizes and swath widths will vary depending on terrain and actual HAGL for any portion of the survey.

Sensor Stabilisation and Navigation

The AMSS is 3-axis stabilised to +/- 1 milliradian and has an integral GPS receiver enabling recording of time, aircraft position, speed and bearing for each scan line.

Cost of Data Acquisition

The STS AMSS survey costs include:-
Data acquisition,
Data calibration,
Data georeferencing,
Data processing,
Production of mineral alteration index maps.

Standard costs of US$40/square kilometre of ground covered include all of the above for a standard 8m pixel size.
Costs increase proportionately for progressively smaller pixel sizes (e.g. for a 4m pixel size, the cost would be US$80/sq.km and for a 6m pixel size costs would be US$60/sq.km.).
Local mobilisation costs of US$1,000 per hour of flying are additional.

SFSI/CASI SENSOR SPECIFICATIONS

Both sensors are "push broom" technology and are portable to local aircraft. Recorded data is delivered both radiometrically and atmospherically corrected and geocoded to either UTM or Lat/Long.

	SFSI	CASI
Spectral Range	1220-2320 nm	403-914 nm
Band Width	10 nm	>2 nm
S:N	500:1 at 50%
Swath Width	2 km	2 km
# of Bands	110	15
Ground Pixel Size	4 m	4 m
FOV	35^o	35^o

SFSI Costing - Peru - September / October 1999

The objective is to put together several companies (minimum 5) to participate in an operational campaign in Peru between the end of August and the end of October. Exact dates will be determined by the companies involved in the campaign but a minimum of 1 month will be allocated to adequately cover the work required.

To keep costs low, many companies in Peru are being approached to share in the campaign. The SFSI can collect data in varying pixel sizes but 4m is the one recommended. This will produce a 2 km wide swath of data. Each flight line can be up to 15 km long and overlaps between lines are planned according to terrain and logistical conditions.

For example:-
An area measuring 20 km x 20 km would take 28 flight lines at a cost of US$2,142/flight line for a total cost of US$60,000 (US$150/sq. km.).

Smaller and larger areas can be flown to clients' requirements. With multiple company participation, areas in all parts of Peru can be covered economically.

The estimated price includes normal mobilisation, de-mobilisation, data acquisition and post-processing (calibration). The customer is advised that the Campaign Group is liable to share additional costs such as stand-by time for weather, mechanical problems, political and government regulatory delays. These would be included at the direct cost only to the individual survey company and amortized over the Campaign Group. By splitting out these former costs, mobilisation costs are reduced and the survey costs more attractive.