added first 5 questions to the FAQ

pages/faq.md

@@ -23,3 +23,42 @@ SELECT * FROM table
 ## How do I do y
 
 ...
+
+{:id="bboxes"}
+## How to describe bounding boxes?
+
+In camtrap-dp there are 4 terms used to describe bounding boxes: `bboxX`, `bboxY`, `bboxWidth` and `bboxHeight`. The values for all those fields are numbers between 0 and 1, relative to the image size.
+
+The `bboxX` and `bboxY` fields are the coordinates of the top-left corner of the bounding box. `bboxX` is measured from the left side of the image and `bboxY` is measured from the top of the image. `bboxWidth` is measured from the left side of the bounding box to the right side of the bounding box. `bboxHeight` is measured from the top of the bounding box to the bottom of the bounding box.
+
+{:id="multiple-events"}
+## How to describe multiple events related to a single resource?
+
+Multiple records in the observations table can reference the same media. See the [github issue](https://github.com/tdwg/camtrap-dp/issues/39).
+
+{:id="multi-camera"}
+## How to handle multi-camera deployments?
+
+See the [github issue](https://github.com/tdwg/camtrap-dp/issues/328).
+
+{:id="non-animal"}
+## Can I describe plant or fungus observations using camtrap-dp?
+
+Currently, possible values for the `observationType` field in the observations table are: `animal`, `human`, `vehicle`, `blank`, `unknown` and `unclassified`. This definition does not allow for observations of plants or fungi. 
+
+If you have a use case for describing non-animal observations using camtrap-dp, please let us know in [this github issue](https://github.com/tdwg/camtrap-dp/issues/346).
+
+{:id="measurements"}
+## How to include measurements in a data package?
+
+todo
+
+{:id="merge"}
+## How to merge data packages describing different projects?
+
+By design, a single camtrap-dp data package describes a single project. However, there are some use cases (for example a meta analysis), where merging multiple data packages could be helpful.
+
+We provide an [R package](https://inbo.github.io/camtrapdp/) to read and manipulate camtrap-dp data packages. The R package contains the [merge function](https://inbo.github.io/camtrapdp/reference/merge_camtrapdp.html) that can be used to merge two data packages into one. The resulting data package is in valid camtrap-dp format and can be published.
+
+Read the merge function documentation on how particular fields are merged in order to avoid loss of information. Please note that when merging x and y data packages, the `project$samplingDesign` field in the resulting package will be set to the value of `project$samplingDesign` from data package x. Because of that, we recommend only merging data packages for projects using the same sampling design.
+