کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6408611 1629465 2015 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Validation of digital soil maps at different spatial supports
ترجمه فارسی عنوان
اعتبار سنجی نقشه های خاک دیجیتال در پشتیبانی های مختلف فضایی
کلمات کلیدی
نقشه برداری خاک، مدل های فضایی، اعتبار سنجی، حمایت کردن، مقیاس،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


- Digital soil maps were validated at three spatial supports.
- DSMs at the coarsest support (soil-land use complexes) were the most accurate.
- Validation at the point support is the worst case scenario for assessing map quality.
- Future work should validate digital soil maps at block supports up to 1000 m.

In this study we validated digital soil maps of clay content at different spatial supports; point, 48 m blocks and soil-land use complexes (SLU). The aim being to examine the change in prediction quality with different prediction supports. Digital soil maps of clay content at depths of 0-10 cm, 10-30 cm and 30-50 cm were created using linear mixed models, legacy soil data and readily available covariates such as digital terrain attributes, landsat and gamma radiometrics. A random stratified sampling design was used to collect an independent validation dataset. There was little change in the accuracy between the point (RMSE = 15.7% for 0-10 cm, 17.4% for 10-30 cm, 15.2% for 30-50 cm) and 48 m block supports (RMSE = 15.5% for 0-10 cm, 17.1% for 10-30 cm, 13.5% for 30-50 cm). However the prediction quality was much improved at the support of the SLUs (RMSE = 9.5% for 0-10 cm, 10.1% for 10-30 cm and 5.1% for 30-50 cm). It is a standard practice in digital soil mapping studies to validate at the point support but our results show that this is likely to represent the worst case scenario for assessing their prediction quality. Further work should consider finding optimal prediction supports for creating digital soil maps.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volumes 241–242, March 2015, Pages 238-249
نویسندگان
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