Lab report 10 hydrology
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This presentation report focuses on the creation of hydrology of an area A geographic information system (GIS) is a system designed to capture, store, manipulate, analyze, manage, and present spatial or geographic data.
Lab report 10 hydrology
- 1. HYDROLOGY Creatingdrainage networkandwatershedboundaryfromDEMdata of Trivandrum. 1. OpenDEM file fromfolderD:/Practical/DEM/tvm_dem.tif 2. OpenArcToolbox ->Spatial Analyst->Hydrology ClickOK.
- 2. SelectFlow DirectionfromHydrology.Giveinputasfilledandoutputasflow_dir.ClickOK. 3. SelectFlowAccumulationfromHydrology.Give inputasflow_dirandsetoutputasflow_acccu. ClickOK
- 3. 4. To ensure thatyour map can show the firstorderstreamswithoutbeingtoocluttered,setthe flow accumulationtovalue asclose to that fromtoposheetaspossible. Here: Go to Map AlgebrainSpatial Analysttoolsetandgive Flow_acccu> 500 (without spaces) Setoutputas flow_accu1
- 4. 5. OpenStreamordertool fromHydrologytoolset. Give inputfile asFlow_Accu1,inputflow directionasFlow_dirand Setoutputfile asstream_order. ClickOK.Nowwe get streamorderas a rasterfile 6. To convertthe stream_order rasterto vectorfile: OpenStreamto feature,
- 5. Give inputas stream_order,inputflow directionasflow_dirand Setoutputas stream_order_v. ClickOK. 7. To see the attribute fields,rightclickonthe vectorfile layerinTable of Contentspanel andselect OpenAttribute table.The Gridcode representsthe streamorder.Youcan categorize the map accordingto streamorder bygoingto Properties ->SymbologyandcategorizingbyGridCode.
- 6. 8. To generate the watershedbasin,OpenBasintool fromHydrologytoolsetandgive inputas flow_dir.ClickOK.