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Messages - hhyoong

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1
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: March 08, 2011, 02:47:17 AM »
http://www.arcgis.com/home/webmap/viewer.html?useExisting=1

Is this the official site? Sorry, if is not.

2
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: March 07, 2011, 08:19:53 AM »
But my coordinates were taken from garmin gps. Is just that i don't understand why it is different with the map from Arcgis official site.

3
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: March 05, 2011, 07:00:08 AM »
Hi all!

Finally, I have discussed the spatial result with my supervisor. The problem now is that the map that I used as the masking boundary has slight difference in coordinate system compared to the gps coordinates. The map was taken from GIS official site. My supervisor afraid that it would not reflect the real locations. How do I match my GPS coordinates (Garmin) to the map taken from the official site?

Please guide. Thank You!

4
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: February 10, 2011, 03:45:51 AM »
@ Noordin

Thanks and sorry for late reply as I was away during CNY.

If the data is outside of the boundary then it would not be part of Kuala Lumpur. That's the problem ><

Is there any other feature/method that will produce a proper contour?

@ MyGIS

Thanks for the reply. I really appreciate it. I feel that it is inappropriate as well. I will discuss with my members and supervisor as well.

5
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 28, 2011, 03:32:47 AM »
Thanks alot Noordin. It really works with the masking feature.



However, I still have some questions. Can you tell me what are the power and search radius type & settings?

And based on the attached image, the contour din cover the whole boundary. Is it due to lack of coordinates at that particular area (without contour)?

How do I cover the whole masking layer?

Sorry for asking so many questions.

6
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 27, 2011, 01:34:04 AM »
Thx for the reply. I will get back to you soon.

7
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 25, 2011, 05:06:27 AM »
Hi Noordin!

Can you please describe it more detail as I don't really understand.

Can I use the map that i pasted in previous replies?

Is that the boundary line (chocolate colour surrounding Kuala Lumpur) that you mentioned?

If is not how should I draw it?

Please guide. Thanks!

8
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 22, 2011, 04:15:36 PM »
Thanks for the reply.


Graduate Color


Graduated Symbol


Proportional Symbol

To me, all three above are not spatial thoughtsysis.

However, our main objective is bout doing spatial thoughtsysis on a KL map and produce color contours to indicate the level of parameters as requested by our supervisor. So I think we have to assume that they are spatially related. Let's ignore whether it is adequate or accurate.

Can I know how to fit my color contours into KL map? I don't want it to be out of the boundary of KL.

Please guide. Thanks once again

9
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 22, 2011, 02:24:41 AM »
Hey.

Mostly from restaurants and petrol stations.

Trio of us had done the lab thoughtsysis for 13 elements/parameters as required by our supervisor. What we need to do now is to do the spatial distribution for each single element based on the result into KL map. Therefore, we have to produce 13 KL map with spatial distribution on it.

Pictures below are the one we managed to produce so far based on your guidance.


Original map with the coordinates


This is the one with IDW model.

I'm not sure whether this is the right way. Any idea how to fit the contour into the map instead of rectangular shape?

Please guide. Thank You

10
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 21, 2011, 06:42:55 PM »
@Noordin

The water sources are actually from pipe water all over KL.

Do you have any idea which model would best fit the distribution?

Can you tell me what should I put for the Z-value field? Is it my impurities level? And what does the power value means? Assuming that is in IDW mode.

11
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 20, 2011, 08:09:50 PM »
@MyGIS

Ya. I'm using ArcGIS and using the Spatial thoughtsyst  extension in the menu. There's a part where I have to key in the Z value >< (Using IDW). So I was wondering is this the one that decides contour levels.

@Noordin

Thanks for guiding me!

The steps are as below:

1. Adding XY data into a Malaysia Map(from website) with WGS 1984 settings

2. Perform the interpolation using Spatial thoughtsyst. Click the second option on General tab under option menu

3. As for thoughtsysis extent is set to Same layer as Coordinates$ Event which is the name for my excel.

4. Interpolate to Raster by selecting IDW (which I don't know which model to be used but follow the tutorial found on the net). I set the Z-value field as ppm which is my level of impurities. The Power, Search Radius type and etc remain unchanged as I have no idea what it is.

What i get is nice colourful contours surrounded by a big rectangle. How should I really fit into Kuala Lumpur Boundary only?

Is IDW the correct model to be used? Please guide on which model to be used to improve the accuracy.

Thanks.

What model would you suggest in order to provide better accuracy? Please guide.

12
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 17, 2011, 03:30:05 PM »
Sorry for late reply as I just came back from Bali.

I will get back to you guys once I have tried it.

Thanks alot

13
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 10, 2011, 05:32:39 AM »
Thanks for the reply.

How should I show my parameter level on the map?Aren't the colours indicate the level of the impurities? I only see Z values as the thing that shown in the legend which verifies the range of impurity.

Please guide again  :)

14
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 09, 2011, 09:45:05 PM »
Hi!

Can I know is this setting correct?

GCS_WGS_1984
Datum: D_WGS_1984

Also, what is Z-factor? I tried few times but I don't understand the difference.

My Z value range from 0.02~ 0.5. But when I key in 0.1 as my Z-factor, the legend shows from 0.168~0.237. I am using IDW mode

Please guide. Thanks

15
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« on: January 08, 2011, 05:27:53 PM »
Thanks once again!

I will try it out and get back to you.

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