Update README, add doxygen to build system

CMakeLists.txt

@@ -1,3 +1,5 @@
+# This is the CMake build file for EMC_post (also known as UPP).
+#
 cmake_minimum_required(VERSION 3.15)
 
 file(STRINGS "VERSION" pVersion LIMIT_COUNT 1)
@@ -9,9 +11,11 @@ project(
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMakeModules/Modules")
 
+# Handle user options.
 option(OPENMP "use OpenMP threading" OFF)
 option(BUILD_POSTEXEC "Build NCEPpost executable" ON)
 option(BUILD_WITH_WRFIO "Build NCEPpost with WRF-IO library" OFF)
+option(ENABLE_DOCS "Enable generation of doxygen-based documentation." OFF)
 
 if(NOT CMAKE_BUILD_TYPE MATCHES "^(Debug|Release|RelWithDebInfo|MinSizeRel)$")
   message(STATUS "Setting build type to 'Release' as none was specified.")
@@ -55,3 +59,10 @@ endif()
 
 add_subdirectory(sorc)
 add_subdirectory(parm)
+
+# If desired, build the doxygen docs.
+if(ENABLE_DOCS)
+  find_package(Doxygen REQUIRED)
+  add_subdirectory(docs)  
+endif()
+

README.md

@@ -1,14 +1,51 @@
 
 # Unified Post-Processing (UPP)
 
-The Unified Post Processing (UPP) package provides tools for post
-processing for NCEP models. For historical reasons, the UPP repository
-is called EMC_post.
-
-This is part of the [NCEPLIBS](https://github.com/NOAA-EMC/NCEPLIBS)
-project. It also serves as a standalone package that is distributed to
-the community. It is built outside of nceplibs for some UFS
-applications (e.g. SRW v1.0.0).
+The Unified Post Processor (UPP) software package is a software
+package designed to generate useful products from raw model
+output.
+
+The UPP is currently used in operations with the Global Forecast
+System (GFS), GFS Ensemble Forecast System (GEFS), North American
+Mesoscale (NAM), Rapid Refresh (RAP), High Resolution Rapid Refresh
+(HRRR), Short Range Ensemble Forecast (SREF), Hurricane WRF (HWRF)
+applications, and is also used in Unified Forecasting System (UFS)
+applications.
+
+The UPP provides the capability to compute a variety of diagnostic
+fields and interpolate to pressure levels or other vertical
+coordinates.
+
+UPP also incorporates the Joint Center for Satellite Data Assimilation
+(JCSDA) Community Radiative Transfer Model (CRTM) to compute model
+derived brightness temperature (TB) for various instruments and
+channels. This additional feature enables the generation of a number
+of simulated satellite products including GOES products.
+
+Output from the UPP is in National Weather Service (NWS) and World
+Meteorological Organization (WMO) GRIB2 format and can be used
+directly by visualization, plotting, or verification packages, or for
+further downstream post-processing, e.g. statistical post-processing
+techniques.
+
+Examples of UPP products include:
+
+- T, Z, humidity, wind, cloud water, cloud ice, rain, and snow on pressure levels
+- SLP, shelter level T, humidity, and wind fields
+- Precipitation-related fields
+- PBL-related fields
+- Severe weather products (e.g. CAPE, Vorticity, Wind shear)
+- Radiative/Surface fluxes
+- Cloud related fields
+- Aviation products
+- Radar reflectivity products
+- Satellite look-alike products
+
+Support for the UFS UPP is provided through the UFS Forum by the
+Developmental Testbed Center (DTC) for FV3-based applications.
+
+The UPP uses some of the [NCEPLIBS](https://github.com/NOAA-EMC/NCEPLIBS)
+project. 
 
 ## Authors
 

docs/CMakeLists.txt

@@ -0,0 +1,15 @@
+# This is the CMake file for building the docs directory of EMC_post.
+#
+# Ed Hartnett 11/5/20
+
+# Create doxyfile.
+set(abs_top_srcdir "${CMAKE_SOURCE_DIR}")
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile @ONLY)
+
+# Build documentation with target all.
+add_custom_target(doc ALL
+  ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
+  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+  COMMENT "Generating API Documentation with Doxygen" VERBATIM)
+
+