In this paper a study carried out by airborne hyperspectral data is presented. Image data concern a forest area (60 km North of Rome -Italy), to evaluate how different spatial resolutions can affect vegetation spectral response and therefore the discrimination among the different communities.
MIVIS images were acquired at different flight altitudes (2000 m and 5000 m), in the same day and on the same surface targets. A radiometric field survey was carried out in order to radiometrically calibrate the airborne images.
Classification were performed on each image by two different techniques: Maximum Likelihood and Spectral Angle Mapper. The results of these classification methods were analysed to evaluate how different spatial resolution can affect vegetation spectral response.
In particular the relationship between spectral and spatial resolution of hyperspectral images was investigated by resampling the 2000 m image (4m/pxl) in order to simulate the radiometric response of surface targets in the MIVIS image acquired at 5000 m of altitude (10m/pxl).
The result suggest that the spatial resolution of aerial images must be decided when the overflight is planned, because the resampled data keeps the original spectral characteristics and upscaling methods do not provide meaningful data in heterogeneous area.
Image processing techniques have been applied to Landsat TM images of Antarctica to enhance both the spectral contrast and the spatial information. The test site is located west of the Terra Nova Bay area, south of the terminal part of the Priestly Glacier and includes mountainous ranges characterized by alpine morphology, a large plateau and valley glaciers. Rock units are mainly constituted by a metamorphic complex, granitoids and supraglacial morains. A method based on principal component transform and on high-pass convolution filtering has allowed us to produce an image map where the spectral and the spatial information of the different surface units were combined. The detection of outcrop boundaries has been improved as well as the visual interpretation of their morphologic features. In general rock units correspond to those mapped by means of geological field survey. Morainic deposits are well discernable from the 'in situ' material appearing different, after processing, in texture and color from the intrusives and metamorphic complexes.
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