c This example shows how to read a data field and two geo-location
c  fields in HDF-EOS5 swath data.

      program read_fields_swath_MLS_Aura_L2GP_BrO

      implicit none

      integer swathfile1
      integer swath1
      integer status
      integer datafield1rank(32)
      integer*4 datafield1dimsize(32)
      integer datafield1type(1)
      character*512 datafield1dimname
      character*512 datafield1maxdimname
      real*4 datafield1data(37,3494)
      integer*4 datafield1start(2)
      integer*4 datafield1stride(2)
      integer*4 datafield1edge(2)
      integer geofield1rank(32)
      integer*4 geofield1dimsize(32)
      integer geofield1type(1)
      character*512 geofield1dimname
      character*512 geofield1maxdimname
      real*4 geofield1data(3494)
      integer*4 geofield1start(1)
      integer*4 geofield1stride(1)
      integer*4 geofield1edge(1)
      integer geofield2rank(32)
      integer*4 geofield2dimsize(32)
      integer geofield2type(1)
      character*512 geofield2dimname
      character*512 geofield2maxdimname
      real*4 geofield2data(3494)
      integer*4 geofield2start(1)
      integer*4 geofield2stride(1)
      integer*4 geofield2edge(1)
      integer*4 i, j
      integer he5_swfldinfo, he5_swrdfld, he5_swdetach, he5_swopen,
     $  he5_swclose, he5_swattach
      external he5_swfldinfo, he5_swrdfld, he5_swdetach, he5_swopen,
     $  he5_swclose, he5_swattach
      integer HE5F_ACC_RDONLY
      parameter (HE5F_ACC_RDONLY=101)

c Open 'MLS-Aura_L2GP-BrO_v01-52-c01_2007d029.he5' using swath API
      swathfile1 = he5_swopen
     $ ('MLS-Aura_L2GP-BrO_v01-52-c01_2007d029.he5', HE5F_ACC_RDONLY)

c Open a swath named 'BrO'
      swath1 = he5_swattach(swathfile1, 'BrO')

c Retrieve information about 'L2gpValue' datafield
      status = he5_swfldinfo(swath1, 'L2gpValue', datafield1rank,
     $  datafield1dimsize, datafield1type, datafield1dimname,
     $  datafield1maxdimname)
c Select necessary range of elements
      datafield1start(1) = 0
      datafield1stride(1) = 1
      datafield1edge(1) = 37
      datafield1start(2) = 0
      datafield1stride(2) = 1
      datafield1edge(2) = 3494
c Read data from 'L2gpValue'
      status = he5_swrdfld(swath1, 'L2gpValue', datafield1start,
     $  datafield1stride, datafield1edge, datafield1data)
c Dump data from 'L2gpValue'
      do i = 1, 30
        do j = 1, 1
          write(*,*), datafield1data(j,i)
        enddo
        write(*,*)
      enddo

c Retrieve information about 'Longitude' geolocation field
      status = he5_swfldinfo(swath1, 'Longitude', geofield1rank,
     $  geofield1dimsize, geofield1type, geofield1dimname,
     $  geofield1maxdimname)
c Select necessary range of elements
      geofield1start(1) = 0
      geofield1stride(1) = 1
      geofield1edge(1) = 3494
c Read data from 'Longitude'
      status = he5_swrdfld(swath1, 'Longitude', geofield1start,
     $  geofield1stride, geofield1edge, geofield1data)
c Dump data from 'Longitude'
      do i = 1, 30
        write(*,*), geofield1data(i)
      enddo

c Retrieve information about 'Latitude' geolocation field
      status = he5_swfldinfo(swath1, 'Latitude', geofield2rank,
     $  geofield2dimsize, geofield2type, geofield2dimname,
     $  geofield2maxdimname)
c Select necessary range of elements
      geofield2start(1) = 0
      geofield2stride(1) = 1
      geofield2edge(1) = 3494
c Read data from 'Latitude'
      status = he5_swrdfld(swath1, 'Latitude', geofield2start,
     $  geofield2stride, geofield2edge, geofield2data)
c Dump data from 'Latitude'
      do i = 1, 30
        write(*,*), geofield2data(i)
      enddo

c Close the swath named 'BrO'
      status = he5_swdetach(swath1)

c Close 'MLS-Aura_L2GP-BrO_v01-52-c01_2007d029.he5'
      status = he5_swclose(swathfile1)

      end