The data types available at each point vary and is indicated in the DATA_TYPES field, described below in the attribute table summary:
-PLOT is the ecology program plot designator; if the plot was established as a range C&T plot and no ecology plot has ever been established there then the C&T name is given.
-CT_CLUSTER if the plot is a range C&T plot its original name is given; many C&T plots have a co-located ecology plot (see PLOT for its number)
-UTMZONE, (UTME, UTMN are the NAD83 UTM coordinates are given to help users located points in the field. - these fields temporarily dropped from the coverage until the next update)
-UTM_SOURCE coordinates were obtained by digitizing from a topographic map (MAP_DIGITIZE) and by GPS reading (GPS_15M). Digitized points combine errors in locating the plot on the map with digitizing error, and in many cases are 100-300 m away from the true location. GPS points were taken by recreational GPS units after scrambling of GPS was turned off in the late 1990s. They are typically accurrate to within 10 or 20 m.
-DATA_TYPES indicates what data types have been collected at the point. Each letter signifies a data type. C - cover/frequency ("Daubenmire" microplot transects, plant canopy cover by species); F - nested plot frequency transects (freqeuncy of plants species in small nested plots); K - Parker 3-step (range condition and trend); L - line-intercept (tree canopy cover); O - ocular macroplot (plant canopy cover by species); P - photography; S - soil description; T - tree mensuration.
HINT: to locate all the plots with a certain type of data in ArcMap, open the attribute table, choose "Options", "Select by Attributes" and then enter a select query for DATA_TYPES using wildcard characters. For example, to select all Parker 3-Step plots, the query would be "DATA_TYPES" LIKE '%K%' (careful, its case-sensitive; also, in ArcView write "DATA_TYPES" ="*K*").