| Autor: |
R. W. Whitney, Marvin L. Stone, John B. Solie, B. R. Criner |
| Rok vydání: |
1999 |
| Předmět: |
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| Zdroj: |
Transactions of the ASAE. 42:1485-1492 |
| ISSN: |
2151-0059 |
| DOI: |
10.13031/2013.13313 |
| Popis: |
Data from a photoelectric diode sensor, equipped with 670 and 780 nm interference filters, were analyzed to determine the maximum field-of-view and minimum percentage of soil covered by bindweed (Convolvulus arvensis) that could be distinguished from bare soil. Images containing one 150-mm bindweed could be distinguished from images of adjacent bare soil for all fields-of-view implying that adaptive thresholding would enable use of a field-of-view as large as 0.71 m2. Detection was 100% for nine of the 11 fields-of-view evaluated and 98% for the other two. When bare soil images were not paired with adjacent bindweed images, a single NDVI threshold could be used to distinguish between the two images with error. Results indicated that the required percentage of bindweed cover within an image was 12% for a 5% error in falsely detecting or failing to detect the presence of bindweed. Error for a fixed NDVI threshold decreased when classified by apparent soil moisture when compared with unclassified data. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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