File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Automated mapping of soybean and corn using phenology

TitleAutomated mapping of soybean and corn using phenology
Authors
KeywordsBrazil
Automated classification
Soybean
MODIS
Corn
Issue Date2016
Citation
ISPRS Journal of Photogrammetry and Remote Sensing, 2016, v. 119, p. 151-164 How to Cite?
AbstractFor the two of the most important agricultural commodities, soybean and corn, remote sensing plays a substantial role in delivering timely information on the crop area for economic, environmental and policy studies. Traditional long-term mapping of soybean and corn is challenging as a result of the high cost of repeated training data collection, the inconsistency in image process and interpretation, and the difficulty of handling the inter-annual variability of weather and crop progress. In this study, we developed an automated approach to map soybean and corn in the state of ParanĂ¡, Brazil for crop years 2010-2015. The core of the approach is a decision tree classifier with rules manually built based on expert interaction for repeated use. The automated approach is advantageous for its capacity of multi-year mapping without the need to re-train or re-calibrate the classifier. Time series MODerate-resolution Imaging Spectroradiometer (MODIS) reflectance product (MCD43A4) were employed to derive vegetation phenology to identify soybean and corn based on crop calendar. To deal with the phenological similarity between soybean and corn, the surface reflectance of the shortwave infrared band scaled to a phenological stage was used to fully separate the two crops. Results suggested that the mapped areas of soybean and corn agreed with official statistics at the municipal level. The resultant map in the crop year 2012 was evaluated using an independent reference data set, and the overall accuracy and Kappa coefficient were 87.2% and 0.804 respectively. As a result of mixed pixel effect at the 500 m resolution, classification results were biased depending on topography. In the flat, broad and highly-cropped areas, uncultivated lands were likely to be identified as soybean or corn, causing over-estimation of cropland area. By contrast, scattered crop fields in mountainous regions with dense natural vegetation tend to be overlooked. For future mapping efforts, it has great potential to apply the automated mapping algorithm to other image series at various scales especially high-resolution images.
Persistent Identifierhttp://hdl.handle.net/10722/296951
ISSN
2023 Impact Factor: 10.6
2023 SCImago Journal Rankings: 3.760
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhong, Liheng-
dc.contributor.authorHu, Lina-
dc.contributor.authorYu, Le-
dc.contributor.authorGong, Peng-
dc.contributor.authorBiging, Gregory S.-
dc.date.accessioned2021-02-25T15:17:02Z-
dc.date.available2021-02-25T15:17:02Z-
dc.date.issued2016-
dc.identifier.citationISPRS Journal of Photogrammetry and Remote Sensing, 2016, v. 119, p. 151-164-
dc.identifier.issn0924-2716-
dc.identifier.urihttp://hdl.handle.net/10722/296951-
dc.description.abstractFor the two of the most important agricultural commodities, soybean and corn, remote sensing plays a substantial role in delivering timely information on the crop area for economic, environmental and policy studies. Traditional long-term mapping of soybean and corn is challenging as a result of the high cost of repeated training data collection, the inconsistency in image process and interpretation, and the difficulty of handling the inter-annual variability of weather and crop progress. In this study, we developed an automated approach to map soybean and corn in the state of ParanĂ¡, Brazil for crop years 2010-2015. The core of the approach is a decision tree classifier with rules manually built based on expert interaction for repeated use. The automated approach is advantageous for its capacity of multi-year mapping without the need to re-train or re-calibrate the classifier. Time series MODerate-resolution Imaging Spectroradiometer (MODIS) reflectance product (MCD43A4) were employed to derive vegetation phenology to identify soybean and corn based on crop calendar. To deal with the phenological similarity between soybean and corn, the surface reflectance of the shortwave infrared band scaled to a phenological stage was used to fully separate the two crops. Results suggested that the mapped areas of soybean and corn agreed with official statistics at the municipal level. The resultant map in the crop year 2012 was evaluated using an independent reference data set, and the overall accuracy and Kappa coefficient were 87.2% and 0.804 respectively. As a result of mixed pixel effect at the 500 m resolution, classification results were biased depending on topography. In the flat, broad and highly-cropped areas, uncultivated lands were likely to be identified as soybean or corn, causing over-estimation of cropland area. By contrast, scattered crop fields in mountainous regions with dense natural vegetation tend to be overlooked. For future mapping efforts, it has great potential to apply the automated mapping algorithm to other image series at various scales especially high-resolution images.-
dc.languageeng-
dc.relation.ispartofISPRS Journal of Photogrammetry and Remote Sensing-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectBrazil-
dc.subjectAutomated classification-
dc.subjectSoybean-
dc.subjectMODIS-
dc.subjectCorn-
dc.titleAutomated mapping of soybean and corn using phenology-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1016/j.isprsjprs.2016.05.014-
dc.identifier.scopuseid_2-s2.0-84973884994-
dc.identifier.volume119-
dc.identifier.spage151-
dc.identifier.epage164-
dc.identifier.isiWOS:000384777300011-
dc.identifier.issnl0924-2716-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats