http://www.landfire.gov/ LANDFIRE Data Versioning Alerts RSS Feed http://www.landfire.gov/version_alerts.php Relative age was not set correctly in the VDDT models in the following eastern zones when they were first made available for download from www.landfire.gov: 25, 26, 27, 29, 30, 33, 34, 37, 44, 45, 55, 56, 58, and 98. Relative age, according to LANDFIRE modeling rules, should be set to the inverse of the end age of the class (for example, if the class end age is 10 and relative age is used, it should be set to -10). In the aforementioned zones, relative age was set to the class end age rather than the inverse of the class end age. In some cases, an incorrect relative age setting could change the model results. The LANDFIRE team has corrected the relative age issue and redelivered corrected files. For zone 25 a new version of the model description document was released to correct inaccurate descriptive information related to this issue. For all other zones, only the VDDT database was changed. The error in the relative age setting did not affect any of the mapped products. Customers are advised to delete any local version 1 databases (that is, those that have "v1" in the file name) they may have downloaded and replace them with the version 2 databases (those that have "v2" in the file name) currently available from the LANDFIRE website. 20-MAY-08 http://www.landfire.gov/version_alerts.php The following fuel layers for zones 41, 50 and 51 were updated spring 2008 to reflect the changes made during our most recent fuel calibration exercise held in Minneapolis, Minnesota: Canopy Bulk Density, Canopy Base Height, Canopy Cover, Canopy Height, 13 Anderson Fire Behavior Fuel Models, and 40 Scott & Burgan Fire Behavior Fuel Models. Users are strongly encouraged to use this updated version of the fuel suite. 20-MAY-08 http://www.landfire.gov/version_alerts.php The following fuel layers for zones 55, 56 and 58 were updated winter 2008 to reflect the changes made during our most recent fuel calibration exercise held in Lake City, Florida and Charleston, South Carolina: Canopy Bulk Density, Canopy Base Height, Canopy Cover, Canopy Height, 13 Anderson Fire Behavior Fuel Models, and 40 Scott & Burgan Fire Behavior Fuel Models. Users are strongly encouraged to use this updated version of the fuel suite. 25-MAR-08 http://www.landfire.gov/version_alerts.php A problem was recently identified with the Aspect layer from Mapping Zone 41. The original version of Aspect was missing Isle Royale in the northeastern region of the zone. Aspect was recalculated to include the island. Customers are advised to delete any local copies of this Aspect layer downloaded prior to March 21, 2008, and download the current version. We regret any inconvenience this may have caused. 25-MAR-08 http://www.landfire.gov/version_alerts.php The following fuel layers for zones 25, 26, 27, 33 and 34 were recently updated to reflect the changes made during our most recent fuel calibration exercise held in Albuquerque, New Mexico: Canopy Bulk Density, Canopy Base Height, Canopy Cover, Canopy Height, 13 Anderson Fire Behavior Fuel Models, and 40 Scott & Burgan Fire Behavior Fuel Models. Users are strongly encouraged to use this updated version of the fuel suite. 19-NOV-07 http://www.landfire.gov/version_alerts.php External review has been completed, and these data products are now available on the National Map LANDFIRE. 27-SEP-07 http://www.landfire.gov/version_alerts.php A minor problem was recently identified with the Aspect, Elevation, Slope, Existing Vegetation Cover, Existing Vegetation Height, and Existing Vegetation Type layers for mapping zone 37. While affected acreage is very small, users are advised to delete any local copies of these six layers downloaded prior to September 6, 2007 and download the updated versions as of September 18, 2007. We regret any inconvenience this may have caused. 18-SEP-07 http://www.landfire.gov/version_alerts.php A minor problem was recently identified with the Aspect, Elevation, Slope, Existing Vegetation Cover, Existing Vegetation Height, and Existing Vegetation Type layers for mapping zone 37. While affected acreage is very small, users are advised to delete any local copies of these six layers downloaded prior to September 6, 2007 and download the updated versions as of September 18, 2007. We regret any inconvenience this may have caused. 18-SEP-07 http://www.landfire.gov/version_alerts.php The following fuel layers for zones 29 and 30 were updated July 20, 2007 to reflect the changes made during our most recent fuel calibration exercise held in Rapid City, South Dakota: Canopy Bulk Density, Canopy Base Height, Canopy Cover, Canopy Height, 13 Anderson Fire Behavior Fuel Models, and 40 Scott & Burgan Fire Behavior Fuel Models. Users are strongly encouraged to use this updated version of the fuel suite. 23-JUL-07 http://www.landfire.gov/version_alerts.php The following fuel layers for zones 9 and 24 were updated July 20, 2007 to include canopy characteristics changes: Canopy Bulk Density, Canopy Base Height, Canopy Cover, Canopy Height, 13 Anderson Fire Behavior Fuel Models, and 40 Scott & Burgan Fire Behavior Fuel Models. Affected acreage is small. Users are encouraged to use this updated version of the fuel suite. 23-JUL-07 http://www.landfire.gov/version_alerts.php A minor problem was recently identified with the Canopy Bulk Density and Canopy Base Height layers for mapping zones 55 and 29. Users are advised to delete any local copies of these two layers downloaded prior to July 3, 2007 and download the current versions. We regret any inconvenience this may have caused. 03-JUL-07 http://www.landfire.gov/version_alerts.php All updated fuel layers for the western mapping zones are available as of May 31, 2007. These updates were conducted to: 1) implement all refinements identified during the calibration workshops, 2) update the fuel layers in response to planned revisions of vegetation products, 3) include data from more plots in the formulation of canopy fuel products, 4) include key deciduous species in the formulation of canopy fuel products, and 5) leverage a new exotics data product to identify annual grasses pervasive throughout much of the western United States. For more information, please visit the Fire Behavior Fuel Model Calibration page. (http://www.landfire.gov/participate_fuel_calibration.php) 31-MAY-07 http://www.landfire.gov/version_alerts.php A problem was recently identified with the Succession Class layer from Mapping Zone 13. Small residual errors from data processing resulted in a slight difference in the Biophysical Setting layer used to create the Succession Class layer as well as the version of the Biophysical Setting layer released for download. These differences could result in errors in calculating local measurements of Fire Regime Condition Class with the FRCC Mapping Tool. Customers are advised to delete any local copies of this Succession Class layer downloaded prior to January 1, 2007 and download the current version. We regret any inconvenience this may have caused. 03-JAN-07