##Cedar_ground_ib_locations
##Contact:  Susan E. Dickerson-Lange (dickers@uw.edu), University of Washington
##Updated: 10/29/2014
##Title: Cedar River Ground iButtons Sample Location Metadata
##PI:  Jessica D. Lundquist (jdlund@uw.edu), University of Washington
##Phone:  (206) 685-7594
##Address:  Civil & Environmental Engineering, 201 More Hall, Box 352700, Seattle, WA 98195-2700
##Website:  http://depts.washington.edu/mtnhydr/ 
##Funding:  National Science Foundation, CBET-0931780

Summary:
Location metadata for grids of ground iButtons (Maxim DS 1922L thermochrons) deployed 1-2 cm below the ground surface at approximately 5 to 10 m spacing in 40 m x 40 m experimental forest plots. Observations were collected from water year 2011 through water year 2014, with new locations added in water year 2013.  Records are not continuous at each location because sensors were deployed in the summer/fall and retrieved in the summer/fall, and in some cases there was a gap during which no instrument was present.  In other cases, the record is not continuous because an instrument was not deployed (e.g. Mount Gardner gap plot after wy 2012), or was lost or failed. Each location ID is unique to a single location in an experimental plot in the Cedar River Municipal Watershed. However, note that the exact location of the sensor relative to the location marker (a pvc pole) varied by year, as did the environmental conditions (e.g. a tree fell on location IB17 (Bear Creek control plot, position 20-20) during water year 2013.

Accuracy & Quality Control:
Geolocation is based on GPS points colllected with a handheld Trimble GeoExplorer 6000 XH for the edges of plots, and the rest of the points were linearly interpolated.  Interpolation was based on known spacing of the sample locations, which were originally surveyed with a total station (BC) or laid out with a tape measure (all other sites).  Post-processed horizontal accuracy of the GPS points ranged from 0.1 to 5 m (note the dense canopy in this study site), so the interpolated points should be taken as +/- 5 m.  Elevation is based on the LiDAR-derived ground model for the geolocated point.  

Location:
Cedar River Municipal Watershed
Approximate Coordinates:  47° 20’ N, 121° 32’ W  (datum:  WGS 1984)
near North Bend, Washington, USA  (King County)

Date(s) of Data Collection:  
Geolocation in summers of 2013 and 2014, elevation from LiDAR data acquired in summer 2012.

Data Citation:
Dickerson-Lange, S.E., Lutz, J.A., Gersonde, R., Martin, K.A., Forsyth, J., and J.D. Lundquist (2015, in preparation for Water Resources Research), Observations of distributed snow depth and snow duration within diverse forest structures in a maritime mountain watershed

Variables:
LocID - Sample location code.  IB stands for iButton and the number is arbitrary.
LocNumber - Number only.
X - Estimated internal coordinate used relative to the southwest corner of the experimental plot.  Meters (m).
Y - Estimated internal coordinate used relative to the southwest corner of the experimental plot.  Meters (m).
Z - Estimated height above the ground surface.  Meters (m).
Site - Site code for general location.
SiteName - Site name for general location.
Plot - Plot code for individual 40 m x 40 m plot of a single forest type or silvicultural treatment.
PlotName - Plot name for individual 40 m x 40 m plot of a single forest type or silvicultural treatment.
Deploy - Position for instrument deployment, i.e. in the ground.
Easting - These locations were collected with a Trimble GeoExplorer 6000 XH for corner locations within the plots and selected additional points, and the rest of the points were linearly interpolated.  Horizontal accuracy of the GPS points ranged from 0.1 to 5 m (note the dense canopy in this study site), so the interpolated points should be taken as +/- 5 m.
Northing - These locations were collected with a Trimble GeoExplorer 6000 XH for the edges of blocks, and the rest of the points were linearly interpolated.  Horizontal accuracy of the GPS points ranged from 0.1 to 5 m (note the dense canopy in this study site), so the interpolated points should be taken as +/- 5 m.
Datum - UTM Zone 10N.  
Elev_m - Elevation from LiDAR-derived bare earth model.  Meters.
WY####_Inst - Field name for instrument deployed in that position for a particular water year.  Used to associate an indivdual datafile with a position, and with pre- and post- deployment validation data for that instrument.
WY####_Stat - Status of instrument from that year's deployment.  Good = functioned as expected.  Marginal = we retrieved data but they are suspect in some way.  Error = no data due to a programming or deployment error.  Failed = we retrieved the instrument but could not retrieve data, this is usually due to battery failure (particularly from water seepage in the "C-series" iButtons, which seems to have been a bad batch).  File Missing = cannot locate a data file from this instrument.  Not Retrieved = the instrument is missing.