diff --git a/articles/ecql_filtering.html b/articles/ecql_filtering.html index 3ba2e4a..1fe320e 100644 --- a/articles/ecql_filtering.html +++ b/articles/ecql_filtering.html @@ -559,20 +559,24 @@

Using OR and AND

Advanced use

There is more that can be accomplished by using the EMODnet WFS -services than downloading data. The emodnet.wfs package is built on top -of the ows4R library, -meaning that all the functionalities of this package are available for -emodnet.wfs. The ows4R returns a special type of R object called R6. You -can learn more in Hadley Wickham’s chapter on R6 Objects of the Advance R book.

+services than downloading data. The emodnet.wfs package is +built on top of the ows4R library, meaning that +all the functionalities of this package are available for emodnet.wfs. +The ows4R returns a special type of R object called R6. You can learn +more in Hadley Wickham’s chapter on R6 Objects of the Advance R book.

For instance: it is not efficient to read a large dataset into R just and later subset part of it. This requires longer waiting times and more bandwidth usage, and in very large datasets it would simply not be possible. For instance, all the occurrences data available through the EMODnet Biology portal are stored in one table: These are approximately 30 millions rows! In this case, we suggest you -access the EMODnet Biology occurrence data through the download toolbox or -the eurobis R -package instead.

+access the EMODnet Biology occurrence data through the EMODnet +geoviewer or the eurobis R package. This +package retrieves occurrences in batches, allowing for large datasets, +and uses viewParams, a geoserver-specific +filtering feature for faster requests compared to standard OGC or +CQL filters. In addition, one of these specific filters allow to query +on species traits such as functional groups.