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| Web URL(s): | https://scisoc.confex.com/scisoc/2019am/meetingapp.cgi/Paper/121248 Last checked: 12/04/2019 Requires: JavaScript |
| Publication Type: | Report |
| Content Type: | Abstract or Summary only |
| Author(s): | Hahn, Daniel |
| Author Affiliation: | Wageningen University & Research Centre, Wageningen, Netherlands |
| Title: | Object based image analysis of high resolution multi-spectral imagery for classifying and quantifying weeds in turfgrass areas |
| Section: | C05 turfgrass science Other records with the "C05 turfgrass science" Section Turfgrass pest management poster: Diseases, insects, weeds (includes student competition) Other records with the "Turfgrass pest management poster: Diseases, insects, weeds (includes student competition)" Section |
| Meeting Info.: | San Antonio, Texas: November 10-13, 2019 |
| Source: | ASA, CSSA and SSSA International Annual Meetings. 2019, p. 121248. |
| Publishing Information: | [Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America] |
| # of Pages: | 1 |
| Keywords: | TIC Keywords: Achillea millefolium; Bellis perennis; Festuca; Image analysis; Models; Multispectral analysis; Percent living ground cover; Percent weed cover; Trifolium repens |
| Abstract/Contents: | "Accurate data collection by visual scores requires the use of experienced assessors to reduce variability in data recording. As an alternative approach, we conducted a study to determine the composition of 136 plots sown with six Festuca spp. cultivars and three weed species (Trifolium repens L., Bellis perennis L., Achillea millefolium L.) with object based image analysis (OBIA). We collected over 600 overlapping multispectral images of a field trial with a Parrot Sequoia (Parrot Drones SAS, Paris, France) camera. The images were taken from 3 m above ground at four spectral bands: green (530-570 nm), red (640-680 nm), red edge (730-740 nm) and near infrared (770-810 nm). An orthomosaic of the study area was created in Agisoft Metashape and OBIA and a Random Forest Model (RFM) were used to classify the complete area of the field experiment in three classes (grass, weed, and soil) and five classes (clover, daisy, grass, soil, and yarrow), respectively. Separation into three classes produced an overall accuracy of 92%, whereas separation into five classes resulted in an overall accuracy of 77%. We used the classification results to calculate the cover percentage of each class per plot and compared this to results obtained with the point quadrant method and with vegetation cover results processed in software package 'turf analyzer'. Three classes (r=0.79, p<0.0001) and five classes (r= 0.74, p< 0.0001) correlated well with results of cover. Weed cover correlated well with three (r= 0.63, p<0.0001) and five classes (r= 0.64, p<0.0001) compared to point quadrant estimations." |
| Language: | English |
| References: | 0 |
| Note: | This item is an abstract only! "181" "Poster #1637" |
| ASA/CSSA/SSSA Citation (Crop Science-like – may be incomplete): | Hahn, D. 2019. Object based image analysis of high resolution multi-spectral imagery for classifying and quantifying weeds in turfgrass areas. Agron. Abr. p. 121248. |
| Fastlink to access this record outside TGIF: | http://tic.msu.edu/tgif/flink/RECNO/309573 |
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| Web URL(s) : | https://scisoc.confex.com/scisoc/2019am/meetingapp.cgi/Paper/121248 Last checked: 12/04/2019 Requires: JavaScript |
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