r
On Wed, 17 Nov 2004 13:36:01 +0800, SCISOFT <[EMAIL PROTECTED]> wrote:
I can't speak for MI versions other than 6.5, but the MB works and the Map >
Options... shows Area Units: square kilometers (which is hectares, of
course).
IL Thomas GeoSciSoft - Perth, Australia
-----Original Message----- From: Robert Crossley [mailto:[EMAIL PROTECTED] Sent: Wednesday, 17 November 2004 1:15 PM To: Dan Bowles Cc: MapInfo List Subject: Re: MI-L FW: Determining polygon areas and proportions within polygons
Dan,
If you open your mapbasic window (Options Show Mapbasic window) and type:
Set Area Units "hectare" then enter, it will alter the system area units.
r
On Wed, 17 Nov 2004 15:53:03 +1100, Dan Bowles <[EMAIL PROTECTED]> wrote:
> Hi Soren
>
> You sent me this email some time ago on area and proportionoverlap
> commands,
> at the time I used other means, however, I'm now using areaoverlap to
> calculate areas of lots affected by flood constraints. It's working
quite
> beautifully, however, I'm struggling with the area units. Changing the
> map
> units from the Map>Options menu item does not seem to change the output
> units. Is there some way I can modify the command to set units to
> "hectare"?
>
> You're help is greatly appreciated.
>
> Regards
> Dan Bowles BSc
> GIS Officer
> Harper Somers O'Sullivan
>
> PO Box 428
> HAMILTON NSW 2303
>
> E [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> T 02 4961 6500
> M 04 3834 8372
>
>
> -----Original Message-----
> From: S�ren Breddam [mailto:[EMAIL PROTECTED]
> Sent: Thursday, 12 August 2004 5:13 PM
> To: 'Dan Bowles'
> Subject: SV: MI-L FW: Determining polygon areas and proportions within
> polygons
>
>
> Hi Dan,
> You do have options doing this with SQL:
>
> MB help:
> AreaOverlap( ) funtion:
> Purpose
>
> Returns the area resulting from the overlap of two closed objects.
>
> Syntax:
> AreaOverlap ( object1, object2 )
> object1 and object2 are closed objects.
>
> Return Value
> A Float value representing the area (in MapBasic's current area units -
> use
> Set Area Units... to change this) of the overlap of the two objects.
> Example:
> Select AreaOverlap(PolygonTable1.Obj, PolygonTable2.Obj) ,
> PolygonTable1.ID,
> PolygonTable2.ID
> Received: From PolygonTable1, PolygonTable2
> Where PolygonTable1.Obj Intersects PolygonTable2.Obj
> Into a Noselect
> Browse * From a
>
> ProportionOverlap( ) function:
> Purpose
> Returns a number that indicates what percentage of one object is covered
> by
> another object.
>
> Syntax
> ProportionOverlap(object1,object2)
> object1 is the bottom object (not text or points)
> object2 is the top object (not text or points)
>
> Return Value
> A Float value equal to Area(Overlap(object1,object2) ) / Area(object1).
>
>
>
> HTH
> S�ren Breddam
>
> -----Oprindelig meddelelse-----
> Fra: Dan Bowles [mailto:[EMAIL PROTECTED]
> Sendt: 12. august 2004 02:14
> Til: MapInfo-L
> Emne: MI-L FW: Determining polygon areas and proportions within polygons
>
>
> Sorry, original message didn't work with explanatory attachment. Hope
you
> understand without...
>
> -----Original Message-----
> From: Dan Bowles [mailto:[EMAIL PROTECTED]
> Sent: Thursday, 12 August 2004 9:35 AM
> To: MapInfo-L
> Subject: Determining polygon areas and proportions within polygons
>
>
> Hi all
>
> I have a very large data set of vegetation classifications (various
> coloured
> polygons in the base of the example map attached), in a GIS also
> including
> proposed vegetation corridors (blue polygons), national parks (green
> polygons) and state forests (brown polygons). The veg corridors, NPs and
> SFs
> do not intersect, however, the vegetation classification polygons
> intersect
> across all other layers.
>
> I need to determine how much area there is of each vegetation class in
> total
> and how much area of each class is contained within each of a number of
> distinct veg corridors (blue), and generally within NPs (green) and SFs
> (brown). I also need to determine percentages of each veg class within
> NPs,
> SFs and veg corridors compared to the entire area.
>
> I am having trouble getting MapInfo to automatically generate these
> statistics for me, any advice you could give would be fantastic.
>
> Thanks for your help
>
> Dan Bowles
>
>
>
-- ________________________________________________
Robert Crossley
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153.549004 E 28.517344 S
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-- ________________________________________________
Robert Crossley
Agtrix P/L 9 Short St PO Box 63 New Brighton 2483 Far Southern Queensland AUSTRALIA
153.549004 E 28.517344 S
P: 02 6680 1309 F: New Connection M: 0419 718 642 E: [EMAIL PROTECTED] W: www.agtrix.com W: www.wotzhere.com
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