Recent Posts

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71
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by ykuan87 on March 03, 2011, 10:08:56 AM »
i din use the map but i am using aerial photograph and uav images.
72
News / Esri Removes Usage Limits
« Last post by MyGIS on March 01, 2011, 04:38:38 PM »
Hi all,

I was surprised to see a couple of articles on the net with more or less the same title; "Esri Removes Usage Limits" (full article is available here ). Amazing enough, at the beginning of the article, the author says "Esri announced on Friday that they are lifting most " ...

Well, esri has also come to adopt OpenStreet into its family of base maps.

Take a look at the article.

Happy reading!
73
Newbie's GIS / Re: UTM and Peninsular Malaysia
« Last post by MyGIS on February 24, 2011, 02:19:45 AM »
Hi

Since precision is no cuicial for this case, I would be using WGS84 and LL84 where applicable. I believe it is sufficient.

Thanks again!
74
Newbie's GIS / Re: UTM and Peninsular Malaysia
« Last post by MyGIS on February 22, 2011, 06:42:32 PM »
Hi,

I guess I agree. I just hope to see one day some paper on how to clear this confusion including all the RSO, Cassini and GDM2000 issues.

Thanks again.
Lyes
75
Newbie's GIS / Re: UTM and Peninsular Malaysia
« Last post by Noordin on February 22, 2011, 12:43:58 AM »
You are highlighting a universal problem with UTM projections i.e. trying to project 2 zones on a single projection. They are 3 main approaches currently adopted by users varying from easiest to most difficult.

a. Using the zone which has most data/land area. This is the normal approach by GIS users. The distortion will be most at the neighbouring zone which has less data. This approach is acceptable for mapping of small scale : 100K and above.
b. Reprojecting into another single projection. This is done with another projection acceptable for big areas (e.g. Lambert). This will minimize the distortion and it is most found at the boundary of the two zones.
c. Computing geodetically (2d or 3d). This is the most tedious method and even has been awarded MSc for attempts to do this. Data from both coordinates were computed to match the real coordinate on the earth surface in world coordinate system like WGS84 etc. This is not too accurate when there is no height information - thus the quality will depend on additional information like heights and availability of control points. This is good for scale 1:50K or larger

NA
76
Newbie's GIS / UTM and Peninsular Malaysia
« Last post by MyGIS on February 21, 2011, 10:47:22 PM »
Hello,

I am trying to set some coordinate systems to export sample data into KML. However KML file require you to set the coordinate systems or it would not work on your Google earth. My question is if we had to set UTM zone to our data; for Malaysia which zone would bethe most adequate? Judging from this picture extracted from this link: http://www.herpnet.org/herpnet/gbif/World_UTM_Map.pdf Peneinsular is divided by two zones: 47 and 48. This is a dilemma if we need to reset the UTM zone every time the data is on another zone of the map.



47 ? 48 ?
77
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by MyGIS on February 21, 2011, 01:35:47 PM »
Hi,

I am trying out something, how big is you map (Mb?) and also how may images do you have?

Thanks.
78
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by ykuan87 on February 19, 2011, 06:25:35 PM »
however, i hope can set up the RSO type in the ER Mapper....
79
Quantum GIS - QGIS / What is Quantum GIS?
« Last post by MyGIS on February 18, 2011, 10:06:27 PM »
Hi there,

It has been a while since I have not written anything heavy here, the reason I had to break this silence is QGIS, or Quantum GIS. An open source project which is taking amplitude. With its price (free) and its impressive interface and the capability to read and write many formats such as ShapeFiles and SDE (oh my).
I must admit that there is a resemblance with ArcGIS interface (I may be paranoid) but it is and easy interface to go your way about.
Just try download it and install it. I find it a good alternative for non free software in a big company with small digitizing environments.

As soon I have some free time, I would certainly explore more on this software as soon as I have some free time.

Try it on! it's free www.qgis.org/en

Good luck!
80
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by MyGIS on February 18, 2011, 03:46:21 PM »
I would advice you to transfer all the data to RSO. Yes, for Peninsular Malaysia it is supposed to be Kertau 1948.
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