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Python -> Virtually Create Dams on GSI Japan DEM

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 Before I will explain the codes and consdertion, I show one of the results that are analysised my codes. The below image is the result that I run the virtual dam creation code near Yamatosaka Dam, 山鳥坂ダム, construction site which is under construction by MILT, Japan at Kawabegawa Branch River Hiji River Ehime Pref.  By Shikoku Regional Development Bureau, MLIT, Yamatosaka Dam's specification is below.(URL:  https://www.skr.mlit.go.jp/yamatosa/pamphlet/pdf/yamadam_jigyou.pdf )  the comparing between Yamatosaka Dam basic design(first value) and the calculation result(second value) are like below. Dam Height: Approximately 96m, 82m (I think that this difference is caused  including surface soft soil thickness on the dam site under calculation.) Dam Top Length: Approximately 275m, 206m Dam Top Elevation: EL161m, EL161m (I try to mutch this values) Storage Area: 0.7km2, 669754m2=0.67km2 Total Storage Volume: 22million cubic meter, 20million cubic meter  It's...

Python-> Using World 3D Digital Elavation Model to get Artifical Satelite Daichi(ALOS) launched by JAXA(4)

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->PythonでJAXAの人工衛星だいち(ALOS)の世界標高データ活用(4)<-   Using the DEM of the Global Data of the ALOS artifical stalite that has been published on the Web from JAXA, Part 4th -> Last time  https://shikuuk.blogspot.com/2025/08/pythonjaxaalos3.html  At this time, I set up our goal to calculate the catchment area at any points of river and to show the catchment area on the 'Folium' map .  Until the last BLOG, I try to download the DEM data of Smatra Island, Indonesia from the ALOS HP published by JAXA and Show the the contour map using Matplotlib, Python.  At this time, I try to calculate the catchment area and to show it on the Folium map.  Before explanation of  some codes, I want to control the version of the code '701_20250912_JAXA_ALOS+OSM_RiverData_v01.ipynb' that I have made ahead, by Git.  I think I want to recognize the files to be controled by Git, I add the header number 'xxxx'. So I decde to rename ''701_20250912_JAXA_ALOS+OSM_Rive...