Page History

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• Georeferences received with new records were preliminarily accepted. Our intent is to review the donor georeferences and edit as needed.
• Many records that were previously not georeferenced have now been georeferenced at their donor institutions and we were able to extract those coordinates and apply them to those records. This especially effects those records that are in our neighbor states and in shared basins.
• Many of our older records lacked georeferences or were georeferenced with large error radii making them less useful for analysis. We reviewed the literature documenting some of the early expeditions in Texas to better determine their collection locations. The effort oldest records in tracks 1 and 2 were collected during Texas boundary and rail road surveys in the early to mid-1800's and lacked specific locality details (no/little text and no coordinates). In version 3 of the database we updated most of the oldest records by reviewing the original survey reports and maps to extrapolate their locations. Delving into the literature also also allowed us to improve collection dates and collector names. 
• Since many of the newer records lacked spatial error, and our spatial algorithms require our georeferences to have a spatial error, we usually applied a default error radius of 45 meters or used the number of digits provided after the decimal to derive an error.
• When we could unambiguously match a textual locality description to that of a previously georeferenced location, we copied its georeference data to the ungeoreferenced locality.

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