direct-location-sequence-diagram.puml

' Copyright 2013-2022 CS GROUP
' Licensed to CS GROUP (CS) under one or more
' contributor license agreements.  See the NOTICE file distributed with
' this work for additional information regarding copyright ownership.
' CS licenses this file to You under the Apache License, Version 2.0
' (the "License"); you may not use this file except in compliance with
' the License.  You may obtain a copy of the License at
'
'   http://www.apache.org/licenses/LICENSE-2.0
'
' Unless required by applicable law or agreed to in writing, software
' distributed under the License is distributed on an "AS IS" BASIS,
' WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
' See the License for the specific language governing permissions and
' limitations under the License.

@startuml

  skinparam svek                                true
  skinparam NoteBackgroundColor                 #F3EFEB
  skinparam NoteBorderColor                     #691616
  skinparam NoteFontColor                       #691616
  skinparam SequenceActorBorderColor            #6A584B
  skinparam SequenceActorBackgroundColor        #F3EFEB/CCC9C5
  skinparam SequenceParticipantBackgroundColor  #F3EFEB/CCC9C5
  skinparam SequenceParticipantBorderColor      #6A584B
  skinparam SequenceLifeLineBackgroundColor     #CCC9C5/F3EFEB
  skinparam SequenceLifeLineBorderColor         #6A584B
  skinparam SequenceArrowColor                  #6A584B
  skinparam SequenceBorderColor                 #6A584B
  skinparam SequenceFontSize                    11

  hide footbox

  actor       "UserMain" as A
  participant "Rugged" as R
  participant "LineSensor" as LS
  participant "SpacecraftToObservedBody" as S
  participant "ExtendedEllipsoid" as E
  participant "IntersectionAlgorithm" as G
  participant "Tile" as T

  activate A
     A  -> R : directLocation(name, number)
     activate R
       R -> LS : apply time stamping model
       R -> S : get transforms at line date
       R -> R : loop over line pixels pₖ
       activate R
         R -> R : fix aberration of light
         R -> E : approximate point on ground
         R -> R : fix speed of light delay in transforms
         R -> G : intersection(ellipsoid, line-of-sight)
         activate G
           G -> E  : grid points crossings
           G -> T : elevation(φₖ, λₖ)
           activate T
             T -> A : DEM callback
             A --> T : DEM raw data cell
             T --> G : h(φₖ, λₖ)
           deactivate T
           G -> E  : grid points crossings
           G -> T : elevation(φₖ, λₖ)
           activate T
             T --> G : h(φₖ, λₖ)
           deactivate T
           G -> E  : grid points crossings
           G -> T : elevation(φₖ, λₖ)
           activate T
             T --> G : h(φₖ, λₖ)
           deactivate T
           G -> T  : pixel intersection(los)
           activate T
             T --> G : φₖ, λₖ, hₖ
           deactivate T
           G --> R : φₖ, λₖ, hₖ
         deactivate G
         R -> R : refine speed of light delay in transforms
         R -> G : refine intersection(ellipsoid, line-of-sight)
         activate G
           G -> T  : refine pixel intersection(los)
           activate T
             T --> G : φₖ, λₖ, hₖ
           deactivate T
         deactivate G
         R --> R : array(φₖ, λₖ, hₖ)
       deactivate R
       R --> A : array(φₖ, λₖ, hₖ)
     deactivate R
  deactivate A

@enduml