Sierra Nevada Multi-source Meadow Polygons Compilation v.2

Resource Type: 
Compiled meadows polygons for the Sierra Nevada of California containing 18,780 meadow polygons (total area = 112,567 hectares, 278,160 acres)


ESRI ArcGIS 10 File Geodatabase


UC Davis, Center for Watershed Sciences & USDA Forest Service, Pacific Southwest Region, 2017. Sierra Nevada Multi-Source Meadow Polygons Compilation (v 2.0), Vallejo, CA, Regional Office: USDA Forest Service.2017.

Weixelman, D. A., B. Hill, D.J. Cooper, E.L. Berlow, J. H. Viers, S.E. Purdy, A.G. Merrill, and S.E. Gross. 2011. Meadow Hydrogeomorphic Types for the Sierra Nevada and Southern Cascade Ranges in California: A Field Key. Gen. Tech. Rep. R5-TP-034. Vallejo, CA. U.S. Department of Agriculture, Forest Service, Pacific Southwest Region, 34 pp.


Tim Lindemann, Dave Weixelman, Carol Clark, Stacey Mikulovsky, Qiqi Jiang, Joel Grapentine, Kirk Evans - USDA Forest Service, Pacific Southwest Region
Wes Kitlasten - U.S. Geological Survey
Sarah Yarnell, Ryan Peek, Nick Santos - UC Davis, Center for Watershed Sciences
Anna Fryjoff-Hung - UC Merced

Contact info :

Ryan Peek

Access and use limitations

This is an unofficial dataset compiled from the best available sources. The University of California, Davis (UCD) & USDA Forest Service (USFS) make no representations or warranties regarding the accuracy of data or maps. The user will not seek to hold UCD nor USFS liable under any circumstances for any damages with respect to any claim by the user or any third party on account of or arising from the use of data or maps. The user will cite UCD & USFS as the original source of the data, but will clearly denote cases where the original data have been updated, modified, or in any way altered from the original condition. There are no restrictions on distribution of the data by users.


Brief Methods:

In version 2 of the Sierra Nevada Multi-source Meadow Polygons Compilation, polygon boundaries from the original layer (SNMMPC_v1 - were updated using ‘heads-up’ digitization from high-resolution (1m) NAIP imagery. In version 1, only polygons larger than one acre were retained in the published layer. In version 2, existing polygon boundaries were split, reduced in size, or merged, and additional polygons not captured in the original layer were digitized. If split, original IDs from version 1 were retained for one half and a new ID was created for the other half. In instances where adjacent meadows were merged together, only one ID was retained and the unused ID was “decommissioned”. If digitized, a new sequential ID was assigned.