County lines

Streams
From the USGS National Hydrology Dataset

California Protected Areas Database
Version 1.7 (9/2011) from Greeninfo Network

The California Protected Areas Database (CPAD) is a GIS inventory of all protected park and open space lands in California. The database contains lands held in fee ownership by public agencies and non-profits.

The units level of this database is shown in Calflora map applications. Click in an area to see a description of the form

name (owner) - access

For instance

Carrizo Plains Ecological Reserve (CDFG) - restricted

WATERSHEDS
From Calwater 2.2.

Calflora map applications can show the four levels of this dataset listed on the right. Which level is shown depends on how far in the map is zoomed in.

MLRAs
Major Land Resource Areas (NRCS)

Click an MLRA name on the right to see a profile.

Zip Codes
From United States Census Bureau TIGER/Line Shapefiles

4ETa Zones
4ETa Zones indicating evaopotranspiration (NRCS California)

Average Annual Precipitation
Annual average precipitation during the period 1971 - 2000, as prepared by the Prism Climate Group at Oregon State University, and available in the form of polygons from the USDA Geospatial Data Gateway.

As presented in Calflora map applications, the colors indicating annual precipitation are continuous. Colors associated with selected precipitation values are shown on the right.

When using a map application, click on the map to find out the annual precipitation at that location.

ECOREGIONS
Bailey's Ecoregions are areas defined by common climatic and vegetation characteristics.

Ecoregion Sections and Subsections for California are from the USDA Forest Service Pacific Southwest Region. The 23 Sections are listed in the table on the right.

In Calflora map applications, Sections are displayed when the map is zoomed out, and Subsections are displayed when the map is zoomed in. Each Subsection has a color similar to that of its containing Section.

NITROGEN DEPOSITION
2002 data for part of California from the Center for Conservation Biology, UC Riverside. Units are kilograms of nitrogen per hectare per year.

See also these UC Riverside publications concerning the effects of nitorgen deposition on plants.