Radius 3 in Space is the Machine (axial analysis) means analysis up to three lines deep from the root line, What is called radius 3 analysis in axial analysis is really radius 2 because it counts the root line as the first line. It's just a historic accident of naming. This has nothing to do with segment angular analysis in DepthMap which is a later development, one which emulates some aspects of axial analysis but also does much more..Of course you can also do axial analysis in DepthMap, and there radius 2 would be the same as radius 3 in axman, as the naming has been corrected. This is what Daniel will have meant, I think. But Radius 2 or  3, which in axial analysis refers to lines, in segment angular analysis is virtually meaningless, since it would refer to segments.. As I said, in DepthMap there is no theoretical counterpart to radius -3 analysis. For local analysis, should  set the radius for segment angular analysis metrically, as it says in my note. Different systems will tend to operate at different local radii, depending on the scaling of the grid. Set the radius at several local levels and see which works best for your  system. DepthMap is designed to allow you to do this. You will find it very powerful. - Bill

ps One point to be careful about is that if you do not have a proper metric in your map,. then depthmap will offer you radius 1,2 3. and so on, and this will refer to a proportion of the system and again have nothing to do with radii in axial analysis.

At 18:09 21/11/2009, you wrote:

Dear Professor,
 
I mean calculating local integration  as in "space is the machine".and I asked it based on Daniel Koch's comment: "correctly R3 in space is the machine equals radius 2 in Depthmap". I entered raduis 3 in my previous practices. now, I dont know what is the correct radius amount for local integration in depthmap?  is it  2 or 3?.
 
Best,
Daniel
 

 
On 11/21/09, Professor Bill Hillier <[log in to unmask]> wrote:

Daniel, there's no counterpart to radius 3 analysis in segment angular analysis. You should set the radius metrically, as in my little note. - Bill

At 16:40 21/11/2009,  you wrote:

Thank you dear Daniel. I got some things that I need.but at the end of your mail, you wrote:

 

"Note: If I remember correctly R3 in space is the machine equals

radius 2 in Depthmap, as depthmap does not include the original

line (spatial entity) in the depth whereas that was done in

earlier software."

Did you mean, in the depthmap, for calculating local integration , we have to write in the blank radius box :"2,n" ?

 

Best Wishes,

Daniel

 

On 11/21/09, Daniel Koch <[log in to unmask]> wrote:

Hi Daniel,

the segment analysis is in many ways a refinement of the axial

line analysis (which is the one in space is the machine), and

more importantly, these are both models, not measures.

Integration on the other hand is a measure, and you can run both

local and global integration on both segment maps and axial maps

- it is important to not confuse model and measure. Which

_measure_ in segment analysis is proposed in the guide?

Which is better also depends on what it is you are analysing

(i.e. what is your question?). For movement and many other

phenomena it is today often found that in an urban settlement

segment analysis of the measure angular choice with radii that

need to be tested has the strongest correlation (although there

are some standards you can follow), for other things it might be

integration (local or global), control, or other measures.

However, axial line analysis of integration does give you a

correlation to movement that is quite high in many cases; it is

just that segment analysis tend to have higher. When it comes to

local or global integration on axial line analysis, the radius

that works best shift with morphology and question, but in a

system with a predominantly local movement pattern (such as

traditional european cities) local integration has usually been

the best for correlation to movement flows.

I am not as versed in segment analysis in practice so I'll not

get into details there but rather leave it to someone who is to fill.

Note: If I remember correctly R3 in space is the machine equals

radius 2 in Depthmap, as depthmap does not include the original

line (spatial entity) in the depth whereas that was done in

earlier software.

Best

/Daniel Koch

Hi All,

I am doing a practice about the integration analysis in a small

urban context (for learning), the software also is "Depthmap". I

found 2 type of analysis. 1: according to professor Hillier's

suggestion in "Using DepthMap for urban analysis: a simple guide

on what to do once you have an analysable map in the system",

that is segment analysis, 2:according to the "space is the

machine".that is local(R=3) and global integration analysis.

Now the question is : what is difference between the two? and For

integration analysis, which of them is better?

thank you in advance for your help,

Daniel

******************************************

Daniel Koch

Architect | Researcher | Teacher

KTH School of Architecture, Sweden

+46 8-790 79 79; www.arch.kth.se/sad

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