Description about cross-section data update

i-RIC · Mar 16, 2023 · 6b16ab5 · 6b16ab5
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diff --git a/source/04/04/03_riv_data.rst b/source/04/04/03_riv_data.rst
@@ -664,6 +664,8 @@ an example of Linear Curve Interpolation Mode.
 
    Example of the [Interpolation Mode (Linear Curve)]
 
+.. _sec_riversurvey_map_pointcloud:
+
 [Map points data]
 -------------------------
 
@@ -680,10 +682,6 @@ Input distance between elevation points etc. and click on [OK].
 
    [Map points data] dialog
 
-.. _sec_pre_riv_crosssection_window:
-
-
-
 [Generate point cloud data]
 -----------------------------------
 
@@ -722,6 +720,8 @@ generated using this function.
    the attribute of generated grid. Please refer to 
    :ref:`sec_gridgen_riv_data_2d` for detail.
 
+.. _sec_pre_riv_crosssection_window:
+
 Operation in the River Cross-section Window
 -------------------------------------------
 

diff --git a/source/06/01_riversurvey.rst b/source/06/01_riversurvey.rst
@@ -85,6 +85,12 @@ of the Cross-Section Data.
 * The distance from the Center Point along the cross-sectional line has
   been calculated.
 
+.. note::
+
+   "#x-section" line and thereafter may be omitted.
+
+   If you omit the "x-section" line and after and read only the coordinates of the left and right banks, the data will be read as cross-section data with an elevation of 0.
+   This function is used, for example, when :ref:`sec_riversurvey_map_pointcloud` is used to calculate the cross-sectional profile by interpolation from point cloud data.
 
 CSV files for importing river center line
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~