New Zealand Trichoptera Database
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Location search


On the 'search for location page' you can find Trichoptera records for a particular location or area.  Searches can be by grid reference, location name, or both.  If you enter numbers in the gridX and gridY boxes they will be interpreted as 5-digit references to the New Zealand Map Grid.  This is a resolution of 100 metres.  If you are reading grid references from an NZMS 260 Topomap the first two digits are the small leading digits in the grid reference for the lower left corner of the map.  The fifth digit is the estimated distance within the 2 cm squares on the map.  If you obtain a grid reference from a GPS or computerised map service that gives 7-digit grid references, you should ignore (or round) the last two digits.  As an example, the centre of "The Square" in Palmerston North City is at grid reference 27317, 60911.

The default search area around the grid reference point is inside a circle of 100 m radius.  Since this is also the resolution of records in the database, only exact matches will be returned.  The search radius can be altered by changing the value in the box.  Note that the radius is specified in kilometres (the 4th digit of a grid reference).

If you enter any characters in the 'Locations' box, only locations containing that string will be returned.  Searches are not case dependent.  If the gridX or gridY boxes are empty, all records from throughout New Zealand matching the location search string will be returned.  If a valid grid reference is also entered, only records that match both the location search string and the search area will be returned.

The table of matching locations is sorted by default from north to south.  You can sort by any other field in the table by clicking on the column heading.  Buttons for navigating multiple pages of results are at bottom right.

Once a set of matching locations has been returned, you have the option of requesting a species list for the entire set.  To return to the location search page you can either use the link at the bottom of the species list (which will clear the search results and parameters) or use your browser's "back" button to retain the search results.

Suggestion - Search for locations containing "manga" (which is 'stream' in Maori).  Not surprisingly there are many matching locations, but they have an interesting distribution (look at the region codes and note the default sorting of north to south).

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Species search

On the 'Search for Species' page you can find details of the distribution records of individual species.  Select a species name from the dropdown list and click the "Show Records" button.  All records of that species will be listed in the table.  Default sorting is by location (north to south) but you can sort on any other field by clicking on the column heading.  Buttons for navigating multiple pages of results are at bottom right.
If you click on the 'details' button for a row, a pop-up window will show the full details of the location, catch and record associated with that row.  If this feature does not work it is most likely that your brower is configured to block popups.  If your browser supports modeless dialog boxes this popup will automatically close when you activate something else, if not you will have to close it manually.

Once the table of records has been returned you are also presented with the option to plot a map of the distribution.  This map is "live" in the sense that if you click anywhere on the map, the grid reference will be shown in the small window above the map.  If you click on a data point, the corresponding row of the database will be highlighted.  Similarly, if you click on "details" for a particular row while the map is present, the corresponding dot on the map will be highlighted.  The map is a jpeg file and can be copied or saved (right click on map) for use outside of nzcaddis (but obviously the live behaviour will be lost).  There is a small tool bar associated with the map that allow you to zoom in and out, and also to shift the map down (hand icon) to reveal the data table, or to return the map.  Note that this is not a popup window so you cannot drag it anywhere.  The map will close automatically if you choose another species or move to another page.  To zoom the map click on the + or - tool buttons and the scale will decrease or increase by 50%.  Now click anywhere on the map and it will zoom in or out centred on the click-point.  To return to the mode where clicking identifies a point, click the "i" tool.  Choosing another species will clear the map and any zoom settings.

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Add data

Data can only be changed or added by approved users who must be logged in - and this feature is not working yet.  If you have data you would like to contribute, or have adult specimens that you would like identified and added to the database, please contact Ian Henderson

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