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Georeferencing Methods. 1) Read Guidelines: Point-radius method. Point radius method for georeferencing locality descriptions and calculating associated uncertainty. John Wieczorek, Quinghua Guo, and Robert Hijmans.

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Georeferencing Methods

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Georeferencing Methods


1) Read Guidelines: Point-radius method

  • Point radius method for georeferencing locality descriptions and calculating associated uncertainty.

  • John Wieczorek, Quinghua Guo, and Robert Hijmans


2) Review Checklist: Choose North/South American region or country of expertise


3)Download localities off of the Gazetteer- Search for localities by entering country or state name in the “Higher Geography” field


  • Click on “View” the localities


Download the localities into text file


Click on “Download”


Tab-delimited text file of PNG localities


4) Import tab-delimited text file of localities into Access or Excel format (Access file template can be found on Georeferencing Steps Website)


5)Post your claim to the listserv-Include region/country name and number of localities downloaded


6) Georeference the localities - first obtain maps and check georeferencing resources.


  • Use paper maps, e.g. 1:24,000 Quad Map of California


Or view maps electronically with GIS software e.g. ArcView


Use on-line gazetteers to locate named places:


Electronic maps can be obtained from many sources:


MapTech Terraine Navigator - Use this for US localities, $99 a state


Determine extent of named place while georeferencing:


Determine error using error calculator:


Example of city with offsets, extents and errors


Read through descriptions of all fields in Access database on the Georeferencing steps page:


Fill in these fields in Access database, even if did not georeference:

  • Note:Please be explicit when providing a NoGeorefBecause reason. State the exact source of uncertainty, ambiguity or inconsistency in the locality description.

  • ND 26 Jun, 2003.


List of some possible reasons why no georeferencing:


7) After finishing, ftp all files to: galaxy.cs.berkeley.edu and e-mail me with the file name & its contents (region, # of localities)


Automated Georeferencing: Biogeomancer

  • For HerpNET best application is for US localities

  • Can make extents available (for US, by Jan)

  • Eventually would include maximum error automatically

  • Could provide input/output in format friendly to HerpNET’s database fields

  • Would still have to be verified by georeferencers at each institution


  • BioGeoMancer is found at http://bwww.biogeomancer.org


News from NSF

  • Standard supplemental funds not available

  • REU (Research Experience for Undergraduates)

  • Collaborative REU Site grant

  • Need to have association with a university

  • Have to provide a research experience, possibly workshops, ArcView training or museum studies

  • Each institution would write a budget justification and description, submitting them separately with KU as lead institution

  • KU will supply major text for grant and link them

  • Due 15 Sep 2004, write for 3 years


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