Thematic mapping Problem

[Elliot Osuni]

hi all,

Am working a range of values on a Tab file and i want to map a specific column called RxLevSubdBm and then edit the range of values with different colors. i succeeded in doing it using MapBasic shade and Symbol clauses, but the problem is that the circles(points) on the map appears in discrete form rather than continuous. i tried the same procedure manually using Mapinfo and it gave me a continuous map points.

attached are the snapshots of the maps the first file called("real") is the desired result(continuous) while the second("fake") is the discrete how can i solve this problem?

please any ideas will be appreciated

Thanks

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Elliot Osuni Kenoye

[Thomas Bacon]

Hi Elliot,

 

I’m not sure that I would describe it as continuous as if you zoom in I’m sure these are all individual points, they just happen to overlap at the zoom level you have set the map window to. The only apparent difference I can see between the two is the symbol style. One symbol style “fake” has a circle with a black outline; the other has no black outline. Changing the style to match that used in the “real” dataset should get you the result you want.

 

One thing to bear in mind however; the colour shown along the route of points is only that of the topmost point. It has no bearing on what the values are underneath it and so could be misleading. Zooming in to a point where the individual points are visible without obscuring one another will provide the true picture of the range of values in a given area.

 

Hope this helps,

 

Tom Bacon

Graduate GIS Engineer

Asset Management South

Tel: 01444 472380

www.mouchel.com

 

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[Elliot Osuni]

Ok i understand your point but my Team head wants us to achieve the "Real" image because in case of presentation the "Real" image is exported to an excel file, which means exporting it as an image and we have to zoom it to get all coverage that's why the "real" image is needed.

here is my code that generates the "Fake" image please let me know if you can add or remove anything;

elliot = FileOpenDlg("","","TAB","Open Table")

Open Table elliot

Ken = PathToTableName$(elliot)

Select RxLevSubdBm from ken into

Selection

Map from Selection

Shade Selection with RxLevSubdBm Ranges 

Apply all

-110:-95 Symbol(34,16711680,12),

-95:-85 Symbol(34,16776960,12),

-85:-75 Symbol(34,255,12),

-75:-65 Symbol(34,32768,12),

-65:0 Symbol(34,65280,12)

Thanks 

hope to hear from you soon.

2012/4/4 Thomas Bacon <Thomas...@mouchel.com>

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Elliot Osuni Kenoye

[Thomas Bacon]

Hi Elliot,

 

Try changing your Symbol clauses as below:

 

-110:-95 Symbol(35,16711680,10,"Map Symbols",0,0),

-95:-85 Symbol(35,16776960,10,"Map Symbols",0,0),

-85:-75 Symbol(35,255,10,"Map Symbols",0,0),

-75:-65 Symbol(35,32768,10,"Map Symbols",0,0),

-65:0 Symbol(35,65280,10,"Map Symbols",0,0)

 

Hopefully that should get the results you’re looking for.

 

HTH,

[Evil "G"]

the quickest way to fix this is to layer propities

 

layer display, display mode

 

then use map symbols the do not have a border

[Elliot Osuni]

Thanks you very much it worked.

2012/4/5 Thomas Bacon <Thomas...@mouchel.com>

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Elliot Osuni Kenoye