| Titre | Temporal filters for mapping phragmites with C-HH SAR data / Filtres temporels pour cartographier les phragmites à partir de données RSO en bande C-HH |
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| Auteur | White, L; Brisco, B; Murnaghan, K; Pasher, J; Duffe, J |
| Source | Canadian Journal of Remote Sensing 2020 p. 1-10, https://doi.org/10.1080/07038992.2020.1799770  Accès ouvert |
| Image |  |
| Année | 2020 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20200393 |
| Éditeur | Taylor & Francis Inc. |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1080/07038992.2020.1799770 |
| Media | papier; en ligne; numérique |
| Formats | pdf; html |
| Province | Ontario |
| SNRC | 31D/13; 31E/04; 41A/16; 41H/01 |
| Région | Parc national du Canada des îles-de-la-Baie-Georgienne |
| Lat/Long OENS | -80.1992 -79.7775 45.1547 44.7731 |
| Sujets | télédétection; imagerie par satellite; méthodes radar; logiciel; végétation; terres humides; eaux de surface; Traitement des données; géophysique; Sciences et technologie; Nature et
environnement |
| Illustrations | cartes de localisation; tableaux; images satellitaires; organigrammes; séries chronologiques |
| Diffusé | 2020 08 18 |
| Résumé | (disponible en anglais seulement)
We compared traditional spatial filters and multi-temporal filters to remove speckle from synthetic aperture radar (SAR) data for mapping Phragmites australis.
SAR constellations, with more rapid revisit capability, allow one to generate stacks of SAR data and to use multi-temporal filters for speckle reduction. GAMMA software offers multi-temporal filters for SAR processing, two of which we compared to the
traditional Enhanced Lee and the Lee filters. We evaluated the filters using three criteria: (1) visual inspection, (2) signal level ratio, and (3) the equivalent number of looks (ENL). The results of this study show that multi-temporal filters were
able to reduce speckle from areas of surface water and land, as well as to improve the detection of Phragmites patches due to preserving the resolution and texture which helped in the detection of the patch boundaries. The signal level ratio was
approximately 1.0 with the GAMMA Multi-temporal filter and approximately 0.9 with the other filters. The enhanced Lee and the two multi-temporal filters produced an equal ENL of about 6. However, due to small patch sizes and backscatter similarity
with cattails and other cover types Phragmites patches were difficult to separate from other types of flooded vegetation with C-HH intensity only. |
| GEOSCAN ID | 327186 |
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