Hyperspektrale Bildanalyse zur Unterscheidung von Ambrosia artemisiifolia und Tagetes ssp.

Abstract

To avoid a further spreading of ragweed, patches as well as single plants have to be located and destroyed. Camera sensors can operate contactless and can easily be fixed to farm and urban machines to scan huge landscape areas. In private gardens cheap hand held devices would come into consideration. Effective monitoring strategies based on optical methods imply spectral differences in the reflection behavior. A hyperspectral line scanner was developed to analyze the reflection properties of plants. Single plants of common ragweed and Tagetes were scanned four times (till flowering). With the software ENVI reference spectra for stems and leaves were generated separately. At all four measurement times no unique spectral differences of the leaves of both plant species were visible. But there were differences regarding the stems especially at the first and second measuring. In contrast to the leaves, the reflection of the stems was increasing from green (550 nm) to red (640 nm) with the exception of marigold stems on the second measuring time. At the third and fourth time the spectra of leaves and stems were similar. A discrimination of the two species by using these two wavelengths did not succeed.

Keywords

• Ambrosia artemisiifolia
• hyperspectral image analysis
• plant discrimination
• Tagetes spp.