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| Titel: |
Relationships between remote sensing spectral indices and crops discrimination |
| Auteur: |
Silleos, N. Misopolinos, N. Perakis, K. |
| Verschenen in: |
Geocarto international |
| Paginering: | Jaargang 7 (1992) nr. 2 pagina's 41-51 |
| Jaar: |
1992-06 |
| Inhoud: |
Multitemporal and multispectral SPOT data were used for calculation of three spectral indices, (1) Radiometric means, (2) Vegetation Index (NDVI), (3) Brightness Index. The sequence reflectance, absorption, reflectance in bands 1,2 and 3 respectively, is common for all the studied crops and months (June and July). The highest differences in reflectance values are observed in July and especially in band 3 which proved very sensitive to chlorophyll development. Pearson correlation coefficients show that combination of band I and 2 or band I and 3 supply more thematic information than band 1 and 2. Discriminant Analysis shows that for sugarebeets, radiometric values and brightness index(BI) present the same classification accuracy. On the other hand Vegetation Index (NDVI) is sufficient for cotton and harvested alfalfa, while the classification accuracy of the other crops ranges between the Radiometric Values and Brightness Index. Pairwise squared generalized distances show that radiometric values and BI discriminate between crops better than NDVI. Comparing the results of Discriminat Analysis to Maximum Likelihood classification and taken into account different mathematical and statistical approach, significant differences exist (except maize and cotton) between the crops. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 181 van 250 gevonden artikelen
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