Evaluation of random forest-based analysis for the gypsum distribution in the Atacama desert
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| Title: | Main Title: Evaluation of random forest-based analysis for the gypsum distribution in the Atacama desert |
| Description: | Abstract: Gypsum-rich material covers the hillslopes above ∼ 1000 m of the Atacama and forms the particular landscape. In this contribution, we evaluate random forest-based analysis in order to predict the gypsum distribution in a specific area of ∼ 3000 km2, located in the hyperarid core of the Atacama. Therefore, three different sets of input variables were chosen. These variables reflect the different factors forming soil properties, according to digital soil mapping. The variables are derived from indices based on imagery of the ASTER and Landsat-8 satellite, geomorphometric parameters based on the Tandem-X World DEM™, as well as selected climate variables and geologic units. These three different models were used to evaluate the Ca-content derived from soil surface samples, reflecting gypsum content. All three different models derived high values of explained variation (r2 > 0.886), the RMSE is ∼ 4500 mg∙kg−1 and the NRMSE is ∼ 6%. Overall, this approach shows promising results in order to derive a gypsum content prediction for the whole Atacama. However, further investigation on the independent variables need to be conducted. In this case, the ferric oxides index (representing magnetite content), slope and a temperature gradient are the most important factors for predicting gypsum content. |
| Identifier: | 10.5194/isprs-annals-IV-3-W2-2020-25-2020 (DOI) |
Responsible Party
| Creators: | Dirk Hoffmeister (Author), Marina Herbrecht (Author), Tanja Kramm (Author), Philipp Schulte (Author) |
| Funding Reference: | Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit |
| Publisher: | ISPRS |
| Publication Year: | 2020 |
Topic
| CRC1211 Topic: | Remote Sensing |
| Related Subproject: | Z2 |
| Subjects: | Keywords: Geomorphology, GIS, Satellite remote sensing |
| Geogr. Information Topic: | Geoscientific Information |
File Details
| Filename: | isprs-annals-IV-3-W2-2020-25-2020.pdf |
| Data Type: | Text - Event Paper |
| File Size: | 1 MB |
| Date: | Available: 29.10.2020 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Free |
| General Access and Use Conditions: | No conditions apply |
| Access Limitations: | No limitations |
| Licence: | [Creative Commons] Attribution 4.0 International (CC BY 4.0) |
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Specific Information - Publication
| Publication Status: | Published |
| Review Status: | Peer reviewed |
| Publication Type: | Event Paper |
| Number of Pages: | 4 (25 - 28) |
| Event: | IEEE Latin American GRSS & ISPRS Remote Sensing Conference (LAGIRS 2020) |
| Event Type: | Conference |
| Event Location: | Santiago, Chile |
| Event Duration: | 22nd of March, 2020 - 26th of March, 2020 |
Metadata Details
| Metadata Creator: | Dirk Hoffmeister |
| Metadata Created: | 16.12.2020 |
| Metadata Last Updated: | 16.12.2020 |
| Subproject: | Z2 |
| Funding Phase: | 1 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 272 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 7 |
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Adequate reference when this dataset will be discussed or used in any publication or presentation is mandatory. In this case please contact the dataset creator.
