 |  |
| |
|
|
|||||||||||
|
About LANDFIRE
 Data Products
Schedule
How to Participate
Documents
Training
|
Data Products ›› LANDFIRE Vegetation Product Descriptions Existing Vegetation Cover
LF_1.1.0 (Refresh 2008) – LF_1.1.0 used LF_1.0.5 (Refresh 2001) data as a launching point to incorporate disturbance and its severity, both managed and natural, which occurred on the landscape after 2001. Specific examples of disturbance are: fire, vegetation management, weather, and insect and disease. The final disturbance data used in LF_1.1.0 are the result of several efforts that include data derived in part from remotely sensed land change methods, Monitoring Trends in Burn Severity (MTBS), and the LANDFIRE Refresh events data call. Vegetation growth was modeled where both disturbance and non-disturbance occurred. LF_1.0.5 (Refresh 2001) – Imagery used in LF_1.0.0 (LANDFIRE National) covered a span of years, and because of this, several large wildland fires are not represented in the data. LF_1.0.5 data ensure wildland fires through 2001 are represented.
LF_1.0.2 (Improvements) – With the release of LF_1.0.0 (LANDFIRE National) data products, several areas of improvements were identified. In 2009, leadership direction and funding were provided to implement these improvements for the conterminous states. Improvements included resolving inconsistencies along the international borders and updating aspects of the following: riparian and wetlands areas, agricultural and urban vegetation types as burnable, and adjusting the extent of barren and water land cover types. Change to the LANDFIRE data products occurred only in areas affected by the improvements listed above. Final vegetation layers were created using a hierarchical merge process, which imbedded updated pixels over the existing values. LF_1.0.1 (Rapid Refresh) – EVC was updated based upon the burn severity of recent (1999 to 2007) wildland fires. (Obtain LF_1.0.1 Fire Perimeter Data.) In general, it was assumed that cover would decrease as burn severity increased. However, the reduction coefficient also depends upon whether the existing vegetation type and life form changed as a consequence of burn severity. Furthermore, the original LANDFIRE fuel layers incorporated additional areas classified as barren and water that were not incorporated into the vegetation layers. In the LF_1.0.1 process, these areas of barren and water were added to the existing vegetation layers to better reflect what is on the ground and to ensure that the vegetation and fuel layers are logically consistent. LF_1.0.0 (National) – EVC was generated using a predictive modeling approach that related Landsat imagery and spatially explicit biophysical gradients to calculated values of average canopy cover from field training sites and digital orthophoto quadrangles.
Metadata:
|
 
|
|||||||||
|
|||||||||||
