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ある表面からより低い表面への一定の勾配を生成する

MikeBickley

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ピットの斜面を設計する際、ピットの縁のフットプリントが地表面（raster）に重ねられており、もう一つの表面（raster）はピットの底を表しています。どちらの表面も水平でも均一でも平行でもありません。問題は、地表面から一定の勾配で下ると仮定して、ピット底のフットプリントをどのように作成するかです。その底のフットプリントを生成することで、これら二つのポリゴン間にラスタを作成し、ピット側面の等高線を描くことが可能になります。<\/P>

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3D Analystがインストールされています。<\/P>

ご提案をお待ちしております！<\/P>

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Mike<\/P><\/BODY><\/HTML>

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Mining

Accepted answers

larryzhang

I see.

Maybe, it is not bad idea to try differently as below.

You can extract all vertices’ values from the base raster, which are intersected with the lower edge of the slope polygon via the gp at http://resources.arcgis.com/en/help/main/10.2/index.html#//00q900000016000000

Once the vertices’ z values obtained from the base surface, you can edit the slope polygon.

Even not horizontal (a sloping and irregular surface), it can be doneeffectively.

Agreed with you, it is challenging, at least, not efficient, especially, for complex and operational mines or constructions, when using 3DAnalyst in ArcGIS to do ‘open pit design’. Maybe, you already have the book (attachment) at your hand…

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larryzhang

In mining industry, many design engineers are using Surpac, which offers effective workflow to do so, including creating pits, dumps and other surface design features and enable the user to analyse and compare the results very easily.

http://www.gemcomsoftware.com/browse/mine-type/open-pit-operations

MikeBickley

Larry - thanks again for your input. I think the idea of extracting the Z values from the intersection of the slope surface and the lower surface will work. Maybe as ESRI develop 3D and mining / geology-specific tools these tasks will become easier...

Mike

larryzhang

I see.

Maybe, it is not bad idea to try differently as below.

Once the vertices’ z values obtained from the base surface, you can edit the slope polygon.

Even not horizontal (a sloping and irregular surface), it can be doneeffectively.

MikeBickley

Larry,

Many thanks for your reply. So far I have seen no solution and am creating this slope in AutoCAD then importing the surface to ArcMAP. The issue is that the lower surface is not horizontal, it is a sloping and irregular surface. Looking at your diagram, imagine that lower intersect surface sloping rather than having constant elevation.

Mike

larryzhang

mike,

your issue is solved aready?

If working with 3D Analyst in ArcGIS for 3D polygon creation (footprint of pit design), please refer to ArcGIS Help (10.2, 10.2.1, and 10.2.2) .

You can edit 2D polygon with attaributes (Z), and then convert into 3D feature class (when needed). When editing the vertices with Z values (at least, 4), please refer to the attachment figure

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