On the scale of the Amazon basin (or of the country or state), each grid is a sampling unit, and the units of sampling are smaller sub-units. For long-term ecological studies within the same site, there are spatially explicit standardized modules that allow comparisons within and between grids. Not all organisms can be efficiently sampled at the same sampling unit.
Most researchers use laboratory or collection techniques that are standardized and there is always much debate about which standards to adopt. However, new and better techniques are continually found. It is practically impossible, and indeed not very useful, to try and restrict regarding what kind of reagents or traps a researcher might use, or any other means of studying their organisms of interest.
The inventory's main objective is to organize, then make available, information from biological surveys in the Amazon. The surveys in question all use RAPELD, a standardized methodology described below. The PPBio portal also provides information on other programs of long-term ecological research whose high-quality data and methodology make them comparable. Data is also provided from independent surveys that have used the RAPELD survey method.
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