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How to Perform Hydrology Analysis and Flood Risk Mapping in ArcGIS? A Complete Tutorial. 

HealthGIS
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By: Dr. Abe Mollalo
00:00 Purpose of the lab
01:09 Load DEM/Slope, Landcover, and precipitation data
07:41 Hillshade/shaded relief map
10:39 Hydrology Analysis (Fill, Flow Direction, Flow Accumulation, Extract Streams)
24:28 Proximity to streams
26:07 Reclassify all criteria (rate/score all layers)
36:17 Generate Flood Risk Map: Combine layers based on given weights
Site selection in GIS (Raster overlay)
• How to Perform Raster ...
Download the data used in this video tutorial:
github.com/DrMollalo/GISData/...

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17 июл 2024

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Комментарии : 74   
@user-vo5gl3bd9w
@user-vo5gl3bd9w Год назад
Amazing! Very clear and workable, Thank you ❤
@mharckus
@mharckus 6 месяцев назад
Wonderful presentation. Very useful and detailed. Kudos
@DK-wz3sl
@DK-wz3sl Год назад
I really like how clear the explanation is in this video, finally i get it after multiple tries. Thanks fam !
@HealthGIS
@HealthGIS Год назад
Glad it helped!
@vineesh.geography
@vineesh.geography Год назад
​@@HealthGIS Can you share the source of Journal
@xlett
@xlett 7 месяцев назад
Thanks for this awesome video!
@cgurbuzie
@cgurbuzie 3 месяца назад
very clear! great job, thanks
@ShobhitSrivastava
@ShobhitSrivastava 2 года назад
Nice work mate. 👍
@kainoakester
@kainoakester Год назад
Thank you so much for this great tutorial!
@HealthGIS
@HealthGIS Год назад
You are so welcome!
@user-sh3wk1zj7y
@user-sh3wk1zj7y Год назад
That was fun, thank you!
@allanm1007
@allanm1007 Год назад
excellent thank you very much.
@mohamedghazy2846
@mohamedghazy2846 6 месяцев назад
bro you made others seems like amateurs ..excellent work!
@iandownes3130
@iandownes3130 2 месяца назад
This helped me fix an issue I had. Thank you! I know I was doing something wrong stepwise
@HealthGIS
@HealthGIS 2 месяца назад
Glad it helped!
@spaceremotesensingandgis5626
Very nice information
@HealthGIS
@HealthGIS Год назад
Thanks!
@paulsteinmetz4906
@paulsteinmetz4906 5 месяцев назад
amazing !
@Valivetirambabu
@Valivetirambabu Год назад
How can we calculate the flood water depth Is it possible to do it in ArcGIS or do we need HecRas or any other tools ? Is it possible with the open-source data
@Jahspeciale
@Jahspeciale 11 месяцев назад
Thanks a lot
@jumaimuhammed9012
@jumaimuhammed9012 10 месяцев назад
Hello, please can i use euclidean distance to locate states in my country that are susceptible to flooding when a particular dam in a neighbouring country is opened?
@kentsacendoncillo125
@kentsacendoncillo125 Год назад
where can i see the tutorial on getting the DEM/Slope data?
@noobgaming1454
@noobgaming1454 Год назад
thank u so much. like this video, i am doing same process but while fill up hill shade, error has been shown. can u give me a idea
@daben2080
@daben2080 10 месяцев назад
How did your pre layer go from stretch symbology to unique values after you clipped it?
@Mike_more
@Mike_more Год назад
thank u so much please where can I download required Data for this analysis
@user-hy4sq8jl6w
@user-hy4sq8jl6w Год назад
hello, can you tell me if you Know the application of ESTIMATION OF INSTANT HYDROGRAPH UNIT WITH CLARK TECHNIQUE IN GIS;
@ximehz4497
@ximehz4497 7 месяцев назад
Hi! Thanks for the explanation, it was very clear so I could apply it to my own work. I wanted to point out something though, when you reclassify the DEM from 2 - 10, you are assigning the value 10 to "flat areas", but isn't the DEM about topographic altitudes? Shouldn't you consider lower numbers as lower altitudes, and not as flat areas (isn't that why you have the slope there)? I say this because in my area, for example, I have the flat areas in higher altitudes (plains) and they can't get flooded even if they are flat, so I had to modify things a bit to get a more accurate end result (according to my area, of course). Anyways, thank you so much for explaining your process in such a detail way, it was really helpful!
@grey4gratitude
@grey4gratitude Год назад
How to validate this final map result?
@getfanmedia
@getfanmedia Год назад
"This is what I like to see."
@kennethvertudazo7710
@kennethvertudazo7710 6 месяцев назад
Thank you so much, is your PowerPoint presentation downloadable? 😅
@mohamedghazy2846
@mohamedghazy2846 6 месяцев назад
also could you elaborate hw to get soul maps and it's classification
@thenameisabii
@thenameisabii 10 месяцев назад
My area is small so precipitation on that area have two pixel value only which I can't weightend sum. Pls help me with this
@abrahamalvarez2730
@abrahamalvarez2730 2 месяца назад
When I used the eucledian tool, I did not get the same esult and the output was not in different classifications but instead in a colo scheme from lo wto high. Why?
@pebruiseruk
@pebruiseruk 9 месяцев назад
Excellent tutorial. Do you have a reference I can cite for the weights chosen? Or can you recommend peer reviewed papers that offer some guidance for weighting? I would like to cite in a report. Thanks.
@maedehsharbaf1760
@maedehsharbaf1760 7 месяцев назад
I have the same question. Did you find any reference for the weighs chosen?
@hikikomorihachiman7491
@hikikomorihachiman7491 4 месяца назад
Hello, the research link you provided based on AHP, Table 5 there had values like 0.156, 0.118, 0.178 and so on form DEM, Slope, and Rainfall and so on. But here in your slide, its tiny bit different, is it because assumed just these 5 values and and found average yourself, or did you referred other books or papers?
@mohammeda3812
@mohammeda3812 Год назад
That is just amazing work! if you allow me, from where you got the Landcover layer?
@HealthGIS
@HealthGIS Год назад
Thanks, its from USGS NLCD, I have explained where you can get that in the previous video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-rs4GX-XIc7A.html
@mohammeda3812
@mohammeda3812 Год назад
@@HealthGIS Thanks for the swift response
@mohammeda3812
@mohammeda3812 Год назад
@@HealthGIS Thanks for this, could you please guide me from where i can download landcover and land use for Iraq ?
@Jahspeciale
@Jahspeciale 11 месяцев назад
Please my map shows in small visible pixels how do I rectify it
@abelcharles6199
@abelcharles6199 Год назад
How I can convert HGBDR format to Tif in arc gis
@Robert_Gustavsson
@Robert_Gustavsson 3 месяца назад
Are there any sources that confirms the use of the specific percentages for the influential factors?
@tuesdaygood7336
@tuesdaygood7336 Год назад
I was working on GeoHECRAS and this helped a lot. Special thanks for sharing the timestamps; they helped me get to the part that directly.
@HealthGIS
@HealthGIS Год назад
I'm glad it was helpful for you.
@mellorahall5522
@mellorahall5522 3 месяца назад
what are the value units for the precipitation data? Millimeters?
@chaitalishinde4715
@chaitalishinde4715 Год назад
Hi there, This work is just excellent and was working out for me. Until I started using the euclidian analyst tool. It is showing an error while saving the output file. Can you please help me out with that? Thanks.
@HealthGIS
@HealthGIS Год назад
The common mistake that leads to error in the Euclidean Distance function is having space for the output path or file name. Please double check..
@liviualexandrunitu8274
@liviualexandrunitu8274 Год назад
Hi, what would be the classification for water, trees, flooded vegetation, crops, built are, bare gound and rangeland? Thank you in advance!
@HealthGIS
@HealthGIS Год назад
The weights depend on the expert's opinion (e.g. using AHP technique). You can extract some of these data using supervised classification of satellite images
@geoempowerinitiative7390
@geoempowerinitiative7390 Год назад
Thanks for the great tutorials. Can you please share any reference that supports the factors used to create the map just in case it needs to be used for research purpose? Thank you.
@HealthGIS
@HealthGIS Год назад
This article might be helpful: Parsian, S., Amani, M., Moghimi, A., Ghorbanian, A., & Mahdavi, S. (2021). Flood hazard mapping using fuzzy logic, analytical hierarchy process, and multi-source geospatial datasets. Remote Sensing, 13(23), 4761.
@ishtiaquehussain56
@ishtiaquehussain56 Год назад
Look at ñ0l
@hikikomorihachiman7491
@hikikomorihachiman7491 4 месяца назад
@@ishtiaquehussain56 ?
@Gonxu90
@Gonxu90 2 месяца назад
@@HealthGIS I was looking for this! Thanks a lot.
@shantakarmohanty6210
@shantakarmohanty6210 9 месяцев назад
Please provide a link to obtain the world rainfall data
@quincyvienn9433
@quincyvienn9433 5 месяцев назад
How did you get the land cover and slope data?
@Jahspeciale
@Jahspeciale 11 месяцев назад
Please my prox to steam output is on 0.1 It analysed the whole boundary instead of the stream network What I'm I not doing right
@AbdullahAlJabir-dr1gh
@AbdullahAlJabir-dr1gh Год назад
What do the 'value' and 'Count' in the attribute table of prc represents?
@noahgarxia
@noahgarxia Год назад
Value is probably precipitation in centimeters or inches, while Count is how many pixels share that same value
@hikikomorihachiman7491
@hikikomorihachiman7491 3 месяца назад
Is there a link for your slope making in arcgis?
@chuksbruno5268
@chuksbruno5268 7 дней назад
The fill tool keeps returning error
@vineesh.geography
@vineesh.geography 2 года назад
👍🏾
@ekantsarkar2561
@ekantsarkar2561 Год назад
The precipitation raster layer is not reclassifying while other layers reclassified smoothly. What could be the possible reason?
@HealthGIS
@HealthGIS Год назад
What's the error message?
@ekantsarkar2561
@ekantsarkar2561 Год назад
@@HealthGIS Reclassify [000000_12301899] Is resolution the issue? Because other maps have a 30 m resolution but the precipitation layer has ~1km resolution!
@HealthGIS
@HealthGIS Год назад
It has nothing to do with other layers. Make sure in the path (including output name) that you store your output raster layer, there is no space or special characters.
@ekantsarkar2561
@ekantsarkar2561 Год назад
@@HealthGIS Yes there are no spaces or special characters involved neither in the path nor in the name. I've checked it. Also the reclassification issue is only with the precipitation layer while the other layers reclassified fine.
@ekantsarkar2561
@ekantsarkar2561 Год назад
If you could consider sharing only the reclassified precipitation map and the weighted flood hazard map (not reclassified), it would be very helpful to cross verify me results.
@MBB112
@MBB112 7 месяцев назад
Why are you reclassifying the generated layers? ?
@fazogird
@fazogird 8 месяцев назад
what is slope ? ,
@iandownes3130
@iandownes3130 2 месяца назад
I saw no one responded. It is based on elevation of contour line
@sureshbhattarai4471
@sureshbhattarai4471 2 месяца назад
very clear! great job, thanks
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