Soil Projects > MEUSIS (Multi-Scale Soil Information System) > Questions & Answers
This section replies to basic questions related to future data collection exersices.
- Q: Which methodology would be followed for upscaling the values of grid cells in the case of Attributes with Numerical Values?
A: One proposal is the Weighted Average of the grid cells for the Numerical Attributes (e.g. topsoil Organic Carbon). - Q: Which methodology would be followed for upscaling the values of grid cells in the case of Attributes with Class Values?
A: One proposal is the Frequency of classes for the Class Attributes (e.g. Parent Material). - Q: How i can create a grid polygon shapefile with specific size?
A: Download the Fishnet Script. This command allows you to create a new shapefile that is composed of many identical sized cells. - Q: Which Projection
system is recommended?
A: The recommended Projection is the ETRS89 Lambert Azimuthal Equal Area (ETRS_LAEA) co-ordinate system. - Q: Who is responsible
for filling the shared (cross border) pixel-cell? The case where two regions
are sharing the same cell.
A: Both partners should fill the pixels for their own area, specifying the percentage of the pixel surface they are able to describe. The responsible person for collecting all pixel data will then decide how to describe the whole pixel. When there is a strong majority of the pixel area belonging to one partner (>80%?) the other partner can be free from describing that pixel. - Q: Is the 1Km x 1Km
pixel a simplified approach? Should it be more detailed? Should it be tested
in 100m or 500m?
A: Every partner is free to test more detailed grids, but standard grid is set to 1 km and multiples of 1km like 100m or 10m. The more suitable pixel size depends on data availability and purposes. Small pixels are necessary for most of the analysis purposes, whereas bigger pixels are more suitable for description and reporting at general levels of detail.
In case you have any further questions, please send an E-mail to the MEUSIS Helpdesk: Panos Panagos.
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