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HydroWatershed 分析

JJ6

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親愛なる Esri メンバーの皆様、<\/P>

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私はアマゾン川流域の一部を調査しようとしており、接続する川を探していましたが、ズームインしたときにのみこれらの接続する川を見ることができます。上は私のコンピュータ画面で、Digital Elevation Model->Perform the Fill Function->そして Flow Accumulation Function を実行した後のものです。<\/P>

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以下は DEM モデルの画像です。<\/P>

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また、大きな Amazon river がモデル内で flow accumulation point として登録されない理由も気になります。<\/P><\/BODY><\/HTML>

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Accepted answers

DanPatterson_Retired

Ok, since your cell size is small and the area large, you are going to have to take some extra steps as shown in this link How Flow Accumulation works—Help | ArcGIS for Desktop then you may want to convert to a polyline using

Raster to Polyline—Help | ArcGIS for Desktop or Stream to Feature—Help | ArcGIS for Desktop if you have all the necessary data.

All comments

NICOLAPEDDIS

Since the area river is very large, you need to additional steps like Dan wrote. Then try to reclass the Flow accumulation to se only the stream accumulation. reclass the raster[0 and 1]. Now if you want you can save the accumulation in the feature class with the tool Raster to Polyline

JJ6

You may also try to convert it to another color

Ex.

but this is even while zoomed in at (1:200,000)

I am also wondering why the actual Amazon river does not seem to register (the straight white line is where it should be)

DanPatterson_Retired

Raster to Polyline—Help | ArcGIS for Desktop or Stream to Feature—Help | ArcGIS for Desktop if you have all the necessary data.

JJ6

Hey Mr.Patterson

I did think of that, and tried it

but as you can see you can barely see it...if I want to look at the DEM picture as a whole.

DanPatterson_Retired

it is because of the colour ramp you are using, reverse it and/or change the black colour range to white

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