.gitignore

+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+# autoconf files/directories
+Makefile.in
+aclocal.m4
+autom4te.cache
+build
+build-aux/ar-lib
+build-aux/compile
+build-aux/config.guess
+build-aux/config.sub
+build-aux/depcomp
+build-aux/install-sh
+build-aux/ltmain.sh
+build-aux/missing
+config.h.in
+config.h.in~
+configure
+m4/libtool.m4
+m4/ltoptions.m4
+m4/ltsugar.m4
+m4/ltversion.m4
+m4/lt~obsolete.m4
+dsproc_test.log
+

Makefile.am

+SUBDIRS = src conf
+
+MAINTAINERCLEANFILES = \
+aclocal.m4 \
+build-aux/ar-lib \
+build-aux/config.guess \
+build-aux/config.sub \
+build-aux/depcomp \
+build-aux/install-sh \
+build-aux/ltmain.sh \
+build-aux/missing \
+config.h.in \
+config.h.in~ \
+configure \
+m4/libtool.m4 \
+m4/lt~obsolete.m4 \
+m4/ltoptions.m4 \
+m4/ltsugar.m4 \
+m4/ltversion.m4 \
+Makefile.in

autogen.sh

+#!/bin/sh
+set -e
+autoreconf --install --force --verbose
+rm -rf autom4te.cache

build-aux/get_package_name.sh

+#!/bin/sh
+
+# Check for BUILD_PACKAGE_NAME environment variable
+
+name=$BUILD_PACKAGE_NAME
+
+if [ -z "$name" ]; then
+
+    # Get 'group-project' from git repo URL
+
+    name=`git config --get remote.origin.url | \
+          sed 's/.*://;s/.git$//;s/\//-/'`
+
+    if [ -z "$name" ]; then
+
+        # Get group name from path to project
+
+        path=`pwd`
+        path=${path%/*}
+        group=$(basename $path)
+
+        # Use directory name for project name
+
+        project=$(basename `pwd`)
+
+        name="$group-$project"
+    fi
+fi
+
+printf $name
+
+exit 0

build-aux/get_package_version.sh

+#!/bin/sh
+
+# Check for BUILD_PACKAGE_VERSION environment variable
+
+version=$BUILD_PACKAGE_VERSION
+
+if [ -z "$version" ]; then
+
+    # Check for most recent package specific tag
+
+    package=$BUILD_PACKAGE_NAME
+
+    if [ -z "$package" ]; then
+        # Use git project name for package name
+        package=`git config --get remote.origin.url | \
+                 sed 's/.*://;s/.git$//;s/^.*\///'`
+    fi
+
+    tag=`git describe --tags --long --dirty --match="${package}-v[0-9]*" 2>/dev/null`
+
+    if [ -z "$tag" ]; then
+        # Check for most recent tag
+        tag=`git describe --tags --long --dirty 2>/dev/null`
+    fi
+
+    if [ -z "$tag" ]; then
+        version="0.0-0-0-g0000000-dirty"
+    else
+        version=`echo $tag | \
+                 sed -E "s/.*v([0-9]+)\.([0-9]+)\.([0-9]+.*)$/\1.\2-\3/"`
+    fi
+
+    parts=(${version//-/ })
+
+    # ${parts[0]} = major.minor
+    # ${parts[1]} = build number
+    # ${parts[2]} = number of commits since last tag
+    # ${parts[3]} = git hash of last commit
+    # ${parts[4]} = 'dirty' if local changes since last commit
+
+    # major.minor-build
+    version="${parts[0]}-${parts[1]}"
+
+    # development version
+    if [ ${parts[2]} != 0 ] || [ ${parts[4]} ]; then
+        # add .dev<commit number>
+        version+=".dev${parts[2]}"
+    fi
+
+    # uncommitted changes in code
+    if [ ${parts[4]} ]; then
+        # add .dirty
+        version+=".${parts[4]}"
+    fi
+
+    # platform
+    system=`uname`
+
+    if [ $system == "Linux" ]; then
+        # use 'el#'
+        platform=`uname -r | sed 's/.*\(el[0-9]\).*/\1/'`
+    else
+        # use system name
+        platform=$system
+    fi
+
+    version="$version.$platform"
+fi
+
+printf $version
+
+exit 0

build.sh

+#!/bin/sh
+
+# Print usage
+
+script_name=$0
+
+usage()
+{
+    cat <<EOM
+
+DESCRIPTION
+
+  Build script to configure, make, and install this package.
+
+SYNOPSIS
+
+  $script_name [--prefix=path [--destdir=path]] [--clean] [--conf]
+
+OPTIONS
+
+  --prefix=path   absolute path to installation directory
+                  default: \$VAP_HOME
+
+  --destdir=path  absolute path prepended to prefix 
+                  used to perform a staged installation
+
+  --clean         cleanup build directory and regenerate
+                  build system files
+
+  --conf          only install conf files
+
+  --strip         strip debugging symbols
+
+  --purify        build with purify
+
+  -h, --help      display this help message
+
+EOM
+}
+
+# Parse command line 
+
+install="install"
+
+for i in "$@"
+do
+    case $i in
+        --clean)      clean=1
+                      ;;
+        --conf)       install="install-data"
+                      ;;
+        --destdir=*)  destdir="${i#*=}"
+                      ;;
+        --prefix=*)   prefix="${i#*=}"
+                      ;;
+        --purify)     purify="true"
+                      ;;
+        --strip)      install="install-strip"
+                      ;;
+        -h | --help)  usage
+                      exit
+                      ;;
+        *)            usage
+                      exit 1
+                      ;;
+    esac
+done
+
+if [ $destdir ] && [ ! $prefix ]; then
+   usage
+   exit 1
+fi
+
+# Get prefix from environemnt variables if necessary
+
+if [ ! $prefix ]; then
+    if [ $VAP_HOME ]; then
+        prefix=$VAP_HOME
+    else
+        usage
+        exit 1
+    fi
+fi
+
+# Function to echo and run commands
+
+run() {
+    echo "> $1"
+    $1 || exit 1
+}
+
+# autogen.sh
+
+if [ $clean ] || [ ! -f ./configure ]; then
+
+    echo "------------------------------------------------------------------"
+    echo "prefix:  $prefix"
+
+    if [ $destdir ]; then
+        echo "destdir: $destdir"
+    fi
+
+    echo "------------------------------------------------------------------"
+    run "./autogen.sh"
+fi
+
+# mkdir build; cd build
+
+echo "------------------------------------------------------------------"
+if [ $clean ] || [ ! -d ./build ]; then
+
+    if [ -d build ]; then
+        run "rm -rf build"
+    fi
+
+    run "mkdir -p build"
+fi
+
+run "cd build"
+
+# configure
+
+if [ $clean ] || [ ! -f ./Makefile ]; then
+    echo "------------------------------------------------------------------"
+    export CFLAGS='-g -O0'
+    run "../configure --prefix=$prefix"
+fi
+
+# make install
+
+if [ $purify ]; then
+    export CC="purify -cache-dir=$HOME/.purecache -windows=no gcc"
+    install="-e $install"
+    echo "------------------------------------------------------------------"
+    run "make clean"
+fi
+
+echo "------------------------------------------------------------------"
+if [ $destdir ]; then
+    run "make DESTDIR=$destdir $install"
+else
+    run "make $install"
+fi
+
+exit

conf/Makefile.am

+langley_mfrsrdir = $(prefix)/conf/vap/langley_mfrsr
+langley_mfrsr_DATA = \
+	langley_mfrsr/langley_mfrsr.process \
+	langley_mfrsr/mfrsrlangley.c1-2.1.dod \
+	langley_mfrsr/mfrsrlangplot.c1-2.1.dod
+
+langley_nimfrdir = $(prefix)/conf/vap/langley_nimfr
+langley_nimfr_DATA = \
+	langley_nimfr/langley_nimfr.process \
+	langley_nimfr/nimfrlangley.c1-2.1.dod \
+	langley_nimfr/nimfrlangplot.c1-2.1.dod
+
+MAINTAINERCLEANFILES = \
+	Makefile.in

conf/langley_mfrsr.process → conf/langley_mfrsr/langley_mfrsr.process

@@ -631,6 +631,10 @@
     }
   },
   'locations' => [
+    {
+      'site' => 'awr',
+      'fac' => 'M1'
+    },
     {
       'site' => 'fkb',
       'fac' => 'M1'
@@ -811,6 +815,7 @@
   'name' => 'langley_mfrsr',
   'cdesc' => 'MFRSR LANGLEY VAP Process Class',
   'props' => {},
+  'desc' => '',
   'type' => 'VAP',
   'class' => 'langley_mfrsr',
   'category' => 'VAP'

conf/langley_nimfr.process → conf/langley_nimfr/langley_nimfr.process

@@ -655,6 +655,7 @@
   'name' => 'langley_nimfr',
   'cdesc' => 'NIMFR LANGLEY VAP Process Class',
   'props' => {},
+  'desc' => '',
   'type' => 'VAP',
   'class' => 'langley_nimfr',
   'category' => 'VAP'

configure.ac

+#                                               -*- Autoconf -*-
+# Process this file with autoconf to produce a configure script.
+
+AC_PREREQ([2.63])
+AC_INIT(
+    m4_esyscmd([./build-aux/get_package_name.sh]),
+    m4_esyscmd([./build-aux/get_package_version.sh]),
+    [])
+
+AC_CONFIG_AUX_DIR([build-aux])
+
+AM_INIT_AUTOMAKE([foreign -Wall -Werror])
+#AM_MAINTAINER_MODE
+
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
+LT_INIT(disable-static)
+
+AC_CONFIG_HEADERS([config.h])
+
+AC_SUBST(PACKAGE_VERSION)
+
+# Checks for programs.
+AM_PROG_CC_C_O
+
+# Checks for libraries.
+
+PKG_CHECK_MODULES([BWADI], [bwadi], [],
+	[AC_MSG_ERROR([bwadi not found in PKG_CONFIG_PATH])])
+
+# Checks for header files.
+
+# Checks for typedefs, structures, and compiler characteristics.
+
+# Checks for library functions.
+
+AC_CONFIG_FILES([Makefile
+                 conf/Makefile
+                 src/Makefile])
+AC_OUTPUT

package/apr_build.sh

+#!/bin/sh
+
+if [ "$1" = "--conf" ]; then
+    conf_package=1
+fi
+
+prefix=$APR_PREFIX
+destdir=$APR_TOPDIR/package
+
+export BUILD_PACKAGE_NAME="$APR_COMPONENT-$APR_PACKAGE"
+export BUILD_PACKAGE_VERSION="$APR_VERSION.$APR_OS"
+
+export PKG_CONFIG_PATH="/apps/ds/lib64/pkgconfig"
+
+if [ $conf_package ]; then
+    $APR_TOPDIR/build.sh --clean --prefix=$prefix --destdir=$destdir --conf
+else
+    $APR_TOPDIR/build.sh --clean --prefix=$prefix --destdir=$destdir --strip
+fi
+

package/langley.yaml

+#------------------------------------------------------------------------------
+# APR Configuration File
+# 
+# Detailed APR documentation can be found here:
+# https://code.arm.gov/distrib/release/blob/master/README.md
+#------------------------------------------------------------------------------
+
+comp:           vap
+package-name:   langley
+default-prefix: /apps/process
+
+build-script:   package/apr_build.sh
+test-script:    test/test.sh
+
+include-items:
+   - (package/apps/process)/bin
+
+author:
+  name:         
+  organization: ''
+  email:        
+  phone:        ''
+
+service-now:
+#  - ENG
+#  - EWO
+
+special-instructions: >
+    None
+
+synopsis: >
+    LANGLEY VAP process.
+
+description: >
+    LANGLEY VAP process.
+
+syntactical-example: >
+    langley -s site -f facility -b YYYYMMDD -e YYYYMMDD
+
+instructions: >
+    Run 'langley -h' for usage instructions.
+
+input-requirements: >
+    See the langley VAP process definition in the PCM
+    for the list of input datastream(s).
+
+output-requirements: >
+    See the langley VAP process definition in the PCM
+    for the list of output datastream(s).
+
+log-files:
+  - ${LOGS_DATA}/${site}/proc_logs/${site}langley${facility}
+
+error-messages: >
+    Error and warning messages are written to the log file,
+    and also emailed to the address specified in the database.
+
+information-messages: >
+    Informational messages are written to the log file.
+
+debug-messages: >
+    Debug messages are written to the terminal when running in debug mode.
+
+sites-facilities: >
+    See the langley VAP process definition in the PCM
+    for the list of sites and facilities.
+
+environment-variables:
+  - ${DATASTREAM_DATA}  top level datastream directory
+  - ${LOGS_DATA}        top level logs directory
+  - ${VAP_HOME}         prefix of VAP installation location
+
+notification-list:
+  - N/A
+
+notes: >
+    None.
+
+related-urls:
+  - N/A
+
+#------------------------------------------------------------------------------
+# Required fields that do not need to be set for this release
+
+build-target:   ''
+privileged:     ''
+exclude-items:  []
+package-dependency: []
+file-dependency: []

package/langley_conf.post

+#!/bin/csh
+# 
+# Post install script for the langley VAP.
+# 
+/bin/csh -c "/apps/ds/bin/db_import_process /apps/process/conf/vap/langley_mfrsr/langley_mfrsr.process"
+/bin/csh -c "/apps/ds/bin/db_load_dod -q    /apps/process/conf/vap/langley_mfrsr/mfrsrlangley.c1-2.1.dod"
+/bin/csh -c "/apps/ds/bin/db_load_dod -q    /apps/process/conf/vap/langley_mfrsr/mfrsrlangplot.c1-2.1.dod"
+/bin/csh -c "/apps/ds/bin/db_import_process /apps/process/conf/vap/langley_nimfr/langley_nimfr.process"
+/bin/csh -c "/apps/ds/bin/db_load_dod -q    /apps/process/conf/vap/langley_nimfr/nimfrlangley.c1-2.1.dod"
+/bin/csh -c "/apps/ds/bin/db_load_dod -q    /apps/process/conf/vap/langley_nimfr/nimfrlangplot.c1-2.1.dod"

package/langley_conf.yaml

+#------------------------------------------------------------------------------
+# APR Configuration File
+# 
+# Detailed APR documentation can be found here:
+# https://code.arm.gov/distrib/release/blob/master/README.md
+#------------------------------------------------------------------------------
+
+comp:           vap
+package-name:   langley_conf
+default-prefix: /apps/process
+architecture:   noarch
+build-target:   noos
+
+build-script:   package/apr_build.sh --conf
+package-script-dir: package
+
+include-items:
+   - (package/apps/process)/conf
+
+author:
+  name:         
+  organization: ''
+  email:        
+  phone:        ''
+
+service-now:
+#  - ENG
+#  - EWO
+
+special-instructions: >
+    None
+
+synopsis: >
+    Configuration files for the langley VAP.
+
+description: >
+    This package loads the process and DOD definitions required by the
+    langley VAP into the database.
+
+notification-list: 
+  - N/A
+
+notes: >
+    None.
+
+#------------------------------------------------------------------------------
+# Required fields that do not need to be set for this release
+
+privileged:     ''
+exclude-items:  []
+package-dependency: []
+file-dependency: []

src/Makefile.am

+bin_PROGRAMS = langley
+
+langley_SOURCES = \
+	barnard_langley.c \
+	jim-plot.c \
+	jim-plot.h \
+	la.c \
+	la.h \
+	langley.c \
+	langley.h \
+	langley_retriever.h \
+	lfit.c \
+	michalsky_analysis.c \
+	michalsky_langley.c \
+	michalsky_langley.h \
+	solarpos.c \
+	sunae.c \
+	sunae.h \
+	time_of.c \
+	util.c \
+	util.h
+
+langley_CFLAGS  = -Wall -Wextra $(BWADI_CFLAGS)
+langley_LDFLAGS = $(BWADI_LIBS)
+
+MAINTAINERCLEANFILES = \
+	Makefile.in

src/langley.pro

@@ -756,29 +756,29 @@ pro langley,  ch, to = to, date = td, $
       endelse
 
       !p.charsize = 1.5
-      xyouts, 0.89, 0.95, f_tau + ":", $
+      xyouts, 0.84, 0.95, f_tau + ":", $
               alignment = 1, /normal
-      xyouts, 0.90, 0.95, string(format='(F6.4)', -slope), $
+      xyouts, 0.85, 0.95, string(format='(F10.4)', -slope), $
               alignment = 0, /normal
-      xyouts, 0.89, 0.925, f_sigma + "!D" + f_tau + "!X!N:", $
+      xyouts, 0.84, 0.925, f_sigma + "!D" + f_tau + "!X!N:", $
               alignment = 1, /normal
-      xyouts, 0.90, 0.925, string(format='(F6.4)', error_slope), $
+      xyouts, 0.85, 0.925, string(format='(F10.4)', error_slope), $
               alignment = 0, /normal
 
       !p.charsize = 1.2
       if (algor eq MICHALSKY) then begin
         xyouts, 5.9, imin+(imax-imin)*.95,"standard deviation  = " + $
-                string(format='(F8.5)', sdp), alignment=1
+                string(format='(F11.5)', sdp), alignment=1
       endif else begin
-        xyouts, 0.85, 0.85, "error in fit:", alignment = 1, /normal
-        xyouts, 0.86, 0.85, string(format='(F7.5)', sdp), $
+        xyouts, 0.80, 0.85, "error in fit:", alignment = 1, /normal
+        xyouts, 0.81, 0.85, string(format='(F11.5)', sdp), $
                 alignment = 0, /normal
       endelse
-      xyouts, 0.85, 0.82, "I!D0!N:", alignment=1, /normal
-      xyouts, 0.86, 0.82, string(format='(F7.5)', I0(channel, k)), $
+      xyouts, 0.83, 0.82, "I!D0!N:", alignment=1, /normal
+      xyouts, 0.84, 0.82, string(format='(F11.5)', I0(channel, k)), $
               alignment=0, /normal
-      xyouts, 0.85, 0.79,"fraction good:", alignment = 1, /normal
-      xyouts, 0.86, 0.79, string(format='(F7.5)', good_fraction), $
+      xyouts, 0.83, 0.79,"fraction good:", alignment = 1, /normal
+      xyouts, 0.84, 0.79, string(format='(F11.5)', good_fraction), $
               alignment = 0, /normal
       xyouts, 0.85, 0.73, "# of points:", alignment = 1, /normal
       xyouts, 0.86, 0.73, string(format='(I4)', num), $ 
@@ -786,18 +786,18 @@ pro langley,  ch, to = to, date = td, $
       
       ; print out algorithm info
       !p.charsize = 1.0
-      xyouts, 0.91, 0.07, "Algorithm:", alignment = 1, /normal
-      xyouts, 0.92, 0.07, algorithm, alignment = 0, /normal
-      xyouts, 0.91, 0.05, "Location:", alignment = 1, /normal
-      xyouts, 0.92, 0.05, site + ' ' + facility, alignment = 0, /normal
-      xyouts, 0.91, 0.03, "DataType:", alignment = 1, /normal
+      xyouts, 0.86, 0.07, "Algorithm:", alignment = 1, /normal
+      xyouts, 0.87, 0.07, algorithm, alignment = 0, /normal
+      xyouts, 0.86, 0.05, "Location:", alignment = 1, /normal
+      xyouts, 0.87, 0.05, site + ' ' + facility, alignment = 0, /normal
+      xyouts, 0.86, 0.03, "DataType:", alignment = 1, /normal
       if (not keyword_set (uncalibrated)) then begin
-        xyouts, 0.92, 0.03, "Calibrated", alignment = 0, /normal
+        xyouts, 0.87, 0.03, "Calibrated", alignment = 0, /normal
       endif else begin
-        xyouts, 0.92, 0.03, "Uncalibrated", alignment = 0, /normal
+        xyouts, 0.87, 0.03, "Uncalibrated", alignment = 0, /normal
       endelse
-      xyouts, 0.91, 0.01, "Instrument", alignment = 1, /normal
-      xyouts, 0.92, 0.01, platform, alignment = 0, /normal
+      xyouts, 0.86, 0.01, "Instrument", alignment = 1, /normal
+      xyouts, 0.87, 0.01, platform, alignment = 0, /normal
 
       ; print out version information
       xyouts, 0.14, 0.01, "IDL Version:", alignment = 1, /normal

test/.purify

+suppress UMR ...;__mktime_internal
+suppress UMR ...;regcomp
+suppress IPR ...;ut_parse
+suppress UMR ...;PQconnectStart
+suppress UMR ...;getaddrinfo
+suppress UMR ...;compress2

test/dsproc_test.cfg

+#-----------------------------------------------------------------------------
+# Configuration file for dsproc_test.
+# 
+# Please run `dsproc_test -h` to read the usage message.
+# 
+#-----------------------------------------------------------------------------
+# Configuration Settings
+#-----------------------------------------------------------------------------
+# 
+# DATA_ROOT           specified in this configuration file (see below)
+# DATA_HOME           $(DATA_ROOT)/data
+# 
+# DSPROCTEST_OUT_DIR  $(DATA_ROOT)/out
+# DSPROCTEST_REF_DIR  $(DATA_ROOT)/ref
+# 
+# DSPROCTEST_LOG_DIR  .
+# DSPROCTEST_LOG_FILE dsproc_test.log
+# 
+# STAGE_DIR           collecting
+# 
+# DIFF_COMMAND        diff
+# GDB_COMMAND         gdb
+# DBX_COMMAND         dbx
+# 
+# NETCDF_BIN          /usr/bin
+# 
+#-----------------------------------------------------------------------------
+# HOME Environment Variables
+#-----------------------------------------------------------------------------
+# 
+# DSDB_HOME
+# INGEST_HOME
+# VAP_HOME
+# 
+#-----------------------------------------------------------------------------
+# DATA Environment Variables
+#-----------------------------------------------------------------------------
+# 
+# COLLECTION_DATA     $(DATA_HOME)/collection
+# CONF_DATA           $(DATA_HOME)/conf
+# DATASTREAM_DATA     $(DATA_HOME)/datastream
+# LOGS_DATA           $(DATA_HOME)/logs
+# QUICKLOOK_DATA      $(DATA_HOME)/www/process
+# TMP_DATA            $(DATA_HOME)/tmp
+# 
+# DATASTREAM_DATA_IN  $(DATASTREAM_DATA)
+# DATASTREAM_DATA_OUT $(DATASTREAM_DATA)
+# 
+#-----------------------------------------------------------------------------
+
+DATA_ROOT /data/home/dev/vap/langley/DATA
+
+#-----------------------------------------------------------------------------
+PROCESS langley_mfrsr vap
+
+COMMAND $(GDB) $(VAP_BIN)/langley -n langley_mfrsr -s $(SITE) -f $(FAC) -b $(BEGIN) -e $(END) $(DEBUG) $(DBALIAS)
+
+RUN sgp C1 20010502 20010503
+RUN sgp C1 20010610 20010611
+RUN sgp C1 20010704 20010705
+
+RUN nsa C1 20010704 20010705
+RUN nsa C1 20010604 20010605
+RUN nsa C1 20060706 20060707
+
+RUN twp C1 20120101 20120102
+
+RUN oli M1 20160722 20160723
+
+#-----------------------------------------------------------------------------
+PROCESS langley_nimfr vap
+
+COMMAND $(GDB) $(VAP_BIN)/langley -n langley_nimfr -s $(SITE) -f $(FAC) -b $(BEGIN) -e $(END) $(DEBUG) $(DBALIAS)
+
+RUN sgp C1 20010704 20010705
+
+RUN nsa C1 20040604 20040605
+RUN nsa C1 20040704 20040705
+
+

test/test.sh

+#!/bin/sh
+
+# Check if the test is being run by APR
+if [ "$APR_TOPDIR" ]; then
+    export VAP_BIN="$APR_TOPDIR/package/$APR_PREFIX/bin"
+    cd $APR_TOPDIR/test
+fi
+
+/apps/ds/bin/dsproc_test
+
+if [ $? != 0 ]; then
+    echo "***** FAILED TEST *****"
+    exit 1
+fi
+
+echo "***** PASSED TEST *****"
+exit