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A COMPARISON OF SPOT HRV AND LANDSAT D MSS AND TM DATA ON 
AGRICULTURAL AND URBAN SITES AND ON COASTAL ZONES 
par 
G.SAINT - A. PODAIRE - C.N.E.S. Toulouse 
M. POUSSE - Université Paris I 
Spectral data were acquired with an airborne scanner on different sites 
and dates in 1981. From these measurements, simulations of SPOT HRV, 
LANDSAT D MSS and TM were computed. 
The simulation technique and its limitations will be presented, showing 
the effects of instrumental and environmental characteristics (atmospheric 
effects, observation conditions). 
A comparison of simulated measurements on an agricultural site will be 
presented for the visible and near infrared bands. Separability and varia- 
bility will be studied with respect to the spectral responses in two cases : 
first, assuming the same EFOV for the three instruments and then taking into 
account the averaging effect related to the different EFOVs. 
On urban areas, due to the enhancement in geometric resolution from LANDSAT 
MSS to SPOT panchromatic data, the analysis can now be conducted more on 
their structures than only on their density. 
The first two spectral bands of TM show some discrimination on coastal zones 
that are not obtained through the SPOT spectral bands, while wave pat- 
terns can be observed on SPOT panchromatic data. 
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