Stress Model Formats: 

We will provide model contributors with a set of points in the
specified input format (the point spacing should over-sample all the
models, so that there isn't any aliasing of undersampled models), and
model contributors will submit the modeled stress at those points in
the specified output format.  The modeled stress should represent
present-day stress, as close as possible.

Input: text file with lines:
LON LAT DEP
 - LON/LAT in degrees, WGS84 (California has negative LON)
 - DEP in km relative to mean sea level (positive: below sea-level; negative: above sea-level)

Output: 
 - text file with two lines per grid point (data line and uncertainty
   line, 1-sigma uncertainty sits below value). if a grid point is outside
   the spatial range of the model, it can be omitted from the output file

 - the data lines should be preceded by one or more header lines,
   begining with #, that include meta-data mentioning the author,
   contact information, date of creating, describing briefly how the
   model was created, whether the model is of stress or stressing rate,
   the spatial resolution of the model, time-period the model represents,
   and any other relevant information

 - any undefined values set to NaN, everything can be set to NaN if point is
   outside range of model

 - modelers providing a full stress tensor do not need to also provide
   SHmax etc, and can set this to NaN

 - all stress magnitudes in MPa, stressing rate magnitudes in MPa/yr

 - tension is taken positive (physics convention)
 
# metadata
LON LAT DEP 1 SHmax_trend SHmax_mag SHmin_mag SV_mag  See Sen Seu Snn Snu Suu                  RATIO DEV  ISO
LON LAT DEP 2  1-sigma     1-sigma   1-sigma  1-sigma DOT dot-1sig ANG s1-1sig s2-1sig s3-1sig 1sig  1sig 1sig


flags:

RATIO: 
1: stress ratio (s2-s3)/(s1-s3) in tensor is meaningful, 1-sigma uncertainty given below
0: stress ratio not meaningful, tensor represents orientations only

DEV: 
1: deviatoric stress (s1-s3)/2 in tensor is meaningful, values in MPa, 1-sigma uncertainty given below
0: deviatoric stress not meaningful

ISO: 
1: isostatic stress (s1+s2+s3)/3 in tensor is meaningful, values in MPa, 1-sigma uncertainty given below
0: isostatic stress not meaningful 

DOT:
1: stress orientation uncertainty defined by normalized tensor dot product (dot-1sig gives 1-sigma value)
0: do not use tensor dot product for uncertainty

ANG:
1: stress orientation uncertainty defined by angular uncertainty of principal axes (s1-1sig etc give 1-sigma values)
0: do not use angular uncertainty


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Data Formats: static files (all start with LON LAT DEP so that stress
models can be queried at data locations for comparison) 

--

Focal Mechanisms: text file with lines:
LON LAT DEP MAG ID STR DIP RAK STR_uncert DIP_uncert RAK_uncert NODAL

NODAL: 
0: nodal plane ambiguous, other nodal plane also acceptable
1: fault plane known, use only given nodal plane

--

Borehole: text file with lines:
LON LAT DEP SHmax_trend SHmax_mag SHmin_mag SV_mag SHmax_trend_uncert SHmax_mag_uncert SHmin_mag_uncert SV_mag_uncert