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REVIEW

Disaggregation of conventional soil maps: a review

Alberto Lázaro-López https://orcid.org/0000-0001-8100-8319 A * , María Luisa González-SanJosé https://orcid.org/0000-0003-2973-7287 A and Vicente Gómez-Miguel https://orcid.org/0000-0003-0144-5776 B
+ Author Affiliations
- Author Affiliations

A Department of Biotechnology and Food Science, Faculty of Science, University of Burgos, Plaza Misael Bañuelos, 09001 Burgos, Spain.

B Departamento de Producción Agraria, Universidad Politécnica de Madrid (UPM), Avda Puerta de Hierro 2, 28040 Madrid, Spain.


Handling Editor: Brendan Malone

Soil Research 59(8) 747-766 https://doi.org/10.1071/SR20288
Submitted: 9 October 2020  Accepted: 8 June 2021   Published: 28 October 2021

© 2021 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

The disaggregation of conventional soil maps is an active research line inside the Digital Soil Mapping framework that aims to generate new cartographies by disclosing the non-explicit soil distribution pattern within the polytaxic or multi-component cartographic units. This article shows a comprehensive review of methodologies found after a bibliographic search in the Web of Science and Scopus databases. They are analysed regarding common factors such as the conventional soil map, environmental data sources and covariates, classification methods, and evaluation; likewise, those specific to the leveraging of conventional maps as the main source of soil information such as sampling scheme and assignment of soil categories for the classification. The applications were frequently carried out in small and medium areas with intensive and extensive conventional soil maps and featuring supervised classification methods. The definition of the training sets is a critical task that has a strong influence on their performance. The comparative analysis noted the potential of the reviewed disaggregation methodologies that adopted two-stage strategies: first, areas potentially associated with soil categories are delimited; and second, supervised models are built on them. Ultimately, the development of new disaggregation methodologies is possible by combining those strategies within each factor that yielded the best results in terms of accuracy.

Keywords: agronomy, covariate importance, digital soil mapping, geostatistics, landform classification, soil-landscape modeling, soil mapping, soil map units, soil survey, spatial disaggregation.


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