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81
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by ykuan87 on February 18, 2011, 06:15:03 AM »
if doing in cassini, the state is johor.
however, i knew the parameter that needed to add into the file.

but my problem is i ned RSO projection type...i think the geodetic datum ned to put KERTAU. but the map projection i reli not sure.
82
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by MyGIS on February 17, 2011, 03:36:40 PM »
Hi there,

I missed out one information. Are you re-projecting to Cassini or RSO? If Cassini, which state is it?

Thanks.
83
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by ykuan87 on February 16, 2011, 10:36:37 PM »
actually i have found the kertau as the geodetic datum , but i duno wat geodetic projection i need 2 put on.
84
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by MyGIS on February 16, 2011, 04:18:39 PM »
Hi ykuan87,

I have never used ER Mapper, however as plan B, if you are totally lost, I know that FME supports ER Mapper format, so this would be helpful to convert from one coordinate system to another. It supports ER Mapper ERS and ER Mapper ECW formats .

I am not sure if this answer would help you or not.

Thanks.
85
Newbie's GIS / how set up RSO in ER Mapper?
« Last post by ykuan87 on February 16, 2011, 08:15:07 AM »
i am final year student from utm. My final year project is regarding of photogrammetry field and  one of the software where i using was ER Mapper for proceed my data. The projection needed must in RSO, so what information should added or typing into the gdt_data, datum.sp and project.dat in c:ERMapper\gdt_data...


i oni can proceed data in cassini projection now since i have those particular info inside gdt_data, datum.sp and project.dat in c:ERMapper\Gdt_data. 
86
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« Last post by hhyoong 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.
87
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« Last post by MyGIS on February 07, 2011, 04:52:58 PM »
Hi,

Please note that I find this method used erratic somehow. The phenomenon is based on data picked from linear networks. Furthermore, the data must have a temporal stamp into it. Unless if you have taken all the samples during the same hour or even day than I would probably accept those data as being from the same group of individuals (statistically speaking).

Using your methodology, you are giving the impression that in between two streets spaced by 5 kilometers there is a water contamination relationship.  ??? . I believe this is incorrect unless proven otherwise by taking intermediary samples.

If you want to use an IDW model. The sampling must be undertaken following a systematic grid for initial sampling, than using a smaller grid to conclude your findings.


I am sure this would had been more appropriate to decide on the cause of the water contamination. Is it the source? or perhaps the pipe which is absorbing (from a hole) the contaminants.

I hope this would give you a different perceptive on your research.

Good luck.
Lyes
  
88
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« Last post by Noordin on February 01, 2011, 12:43:44 AM »
For the output, the issue is simply because your output depends on your extreme limit of your sampling point. Thus your data need to be outside the boundary for you to mask the area.

The output value for a cell using IDW is limited to the range of the values used to interpolate. Because IDW is a weighted distance average, the average cannot be greater than the highest or less than the lowest input. Since the influence of an input point on an interpolated value is distance related, IDW is not "ridge preserving".
89
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« Last post by hhyoong 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.
90
Newbie's GIS / Re: Spatial distribution on Kuala Lumpur map
« Last post by hhyoong on January 27, 2011, 01:34:04 AM »
Thx for the reply. I will get back to you soon.
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