logo Calflora Patch Finder Help
The Patch Finder application lets you search for patches and see them on a map.

A patch is a group of observation records of the same plant, spatially close to each other. The oldest observation in a patch is the root record. Other records in the patch bear some relationship to the root record:

  • Duplicate: A record is classified as a possible duplicate of the root if
      A. the location is within 0.1 meter of the root record and the observation date if the same; or

      B. the location is within 0.5 meter of the root record, the observation month and year are the same year as those of the root record, and the record has either the same observer or the same source (organization) as the root record.

  • Assessment: A record is classified as a later assessment of the root if the location is within four meters of the root record, and the observation month and year are later than those of the root record. (The later record may be a report on the condition of the same plant as the root record.)

  • Other Close Observation: A record is classified as a close observation of the root if the location is within eight meters, and the criteria for possible duplicate or assessment are not met. (Close observations are included because the algorithm for finding duplicates is imperfect -- sometimes records which really are duplicates do not meet the criteria above.)

Using the Application.
Zoom into a particular location and choose a plant name or a Plant Status, such as non-native. If you are only interested in possibly duplicate records, set Patch Type to duplicates?. Press SEARCH.

    If any patches are found meeting your criteria, they will appear in a result table below the map. Each observation shown is the root record of a patch.
To see all the observations in a patch, click on the record ID, and then click show-records-in-this-patch. The Patch ID field will be filled with the root record number of the patch you chose, and the result table will be filled with all of the records in that patch. Note that you may not see distinct points on the map, because the points for each record may be in exactly the same location.
    At this point, if you own the records or have permission to edit, you may delete any of these records. If you are intending to delete duplicate records, please look carefully to make sure that you have really found duplicate records before deleting any of them.
Press the browser back button to return to the earlier result.